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. 2021 Sep 25;4(2):115–132. doi: 10.1016/j.cjco.2021.09.013

The Canadian Women’s Heart Health Alliance Atlas on the Epidemiology, Diagnosis, and Management of Cardiovascular Disease in Women — Chapter 4: Sex- and Gender-Unique Disparities: CVD Across the Lifespan of a Woman

Sharon L Mulvagh a,b,, Kerri-Anne Mullen c, Kara A Nerenberg d, Amy A Kirkham e, Courtney R Green f, Abida R Dhukai g, Jasmine Grewal h, Marsha Hardy i, Paula J Harvey j, Sofia B Ahmed d, Donna Hart i, Anna LE Levinsson k, Monica Parry g, Heather JA Foulds l, Christine Pacheco m, Sandra M Dumanski d, Graeme Smith n, Colleen M Norris o,p
PMCID: PMC8843896  PMID: 35198930

Abstract

Women have unique sex- and gender-related risk factors for cardiovascular disease (CVD) that can present or evolve over their lifespan. Pregnancy-associated conditions, polycystic ovarian syndrome, and menopause can increase a woman’s risk of CVD. Women are at greater risk for autoimmune rheumatic disorders, which play a role in the predisposition and pathogenesis of CVD. The influence of traditional CVD risk factors (eg, smoking, hypertension, diabetes, obesity, physical inactivity, depression, anxiety, and family history) is greater in women than men. Finally, there are sex differences in the response to treatments for CVD risk and comorbid disease processes. In this Atlas chapter we review sex- and gender-unique CVD risk factors that can occur across a woman’s lifespan, with the aim to reduce knowledge gaps and guide the development of optimal strategies for awareness and treatment.


Women have unique risk factors for cardiovascular (CV) disease (CVD) related to aspects of female reproductive biology over their lifespan, including pregnancy-associated conditions, polycystic ovarian syndrome (PCOS), and menopause.1 Women are also at greater risk for autoimmune rheumatic disorders, which play a role in predisposition and pathogenesis of CVD; further, differential effects of traditional atherosclerotic CVD risk factors have been observed such that the influence of these factors on CV risk is greater in women than men.2 Finally, sex differences in response to treatments for CVD risk and comorbid disease processes have been shown, related to differences in female metabolism and elimination of drugs as well as associated comorbidities such as breast cancer, renal disease, and depression. Table 1 shows a summary of existing guidelines, recommendations, and position statements concerning the management of CV risk and disease in relation to several of the conditions reviewed in this chapter. Thus, knowledge of the sex- and gender-unique CV risk factors in women are essential to resolving treatment gaps and critical to improving CV outcomes in women. In this Atlas chapter these sex- and gender-unique disparities in CVD risk across a woman’s lifespan are reviewed, with the aim to reduce knowledge gaps and guide the development of optimal strategies for awareness and treatment. Figure 1 shows a summary of key information included in this chapter. As stated in the Canadian Women’s Heart Health Alliance (CWHHA) Atlas chapter 1, the terms “sex” and “gender” are often incorrectly used interchangeably despite clear and distinct definitions.3 Sex refers to biological constructs that are primarily associated with physical and physiological features, including hormones, genes, anatomy, and physiology typically categorized as female or male. Gender refers to socially constructed roles, behaviours, expressions, and identities, and is typically categorized as woman/girl or man/boy. In this and all chapters of the CWHHA Atlas, we try to adhere to these definitions, or in the event that source material does not clearly indicate sex vs gender data, we defer to use of whichever term implies the greatest contextual sense.

Table 1.

Summary of existing guidelines, recommendations, and position statements concerning the management of cardiovascular risk and disease in relation to other sex- and gender-unique health conditions

Condition Document/guideline Organization
Contraceptive use
  • U.S. Medical Eligibility Criteria for Contraceptive Use

  • Centers for Disease Control and Prevention218

  • Canadian Contraception Consensus Part 4 of 4: Combined Hormonal Contraception

  • The Society of Obstetricians and Gynaecologists of Canada219

Pregnancy
  • 2018 Guidelines for the Management of Hypertension in Pregnancy

  • Hypertension Canada31,227

  • Cardiovascular Diseases During Pregnancy Guidelines

  • European Society of Cardiology33

  • Pregnancy and Heart Disease

  • The American College of Obstetricians and Gynecologists220

Polycystic ovarian syndrome
  • Recommendations From the International Evidence-Based Guideline for the Assessment and Management of Polycystic Ovary Syndrome

  • The International Polycystic Ovarian Syndrome Network53

Menopause
  • Chapter 2 Cardiovascular Disease

  • Society of Obstetrics and Gynecology of Canada221

  • 2017 Therapy Position Statement

  • The North American Menopause Society64

  • Hormone Therapy and Heart Disease

  • The American College of Obstetrics and Gynecology222

  • 2016 Recommendations on Women’s Midlife Health and Menopause Hormone Therapy

  • The International Menopause Society56

  • Menopause Transition and CVD Risk: 2020 Scientific Statement

  • The American Heart Association70

Autoimmune rheumatic diseases
  • Chronic Pain, Diclofenac and Cardiovascular Risk: Management Algorithm

  • The Canadian Rheumatology Association223

  • Clinical Practice Guidelines

  • The American College of Rheumatology224

Depression
  • Screening and Management of Depression in Patients With Cardiovascular Disease: State-of-the-Art Review

  • The American College of Cardiology176

Chronic kidney disease
  • Kidney Disease Improving Global Outcomes Guidelines (Sex-Specific Recommendations Under Development)

  • Kidney Disease Improving Global Outcomes225

Breast cancer
  • Guidelines for Evaluation and Management of Cardiovascular Complications of Cancer Therapy

  • Canadian Cardiovascular Society206

  • Expert Consensus for Multimodality Imaging Evaluation of Adult Patients During and After Cancer Therapy

  • The American Society of Echocardiography/European Association of Cardiovascular Imaging226

  • Compounding Risk and Protection Model

  • University of Alberta204

Figure 1.

Figure 1

Summary of sex- and gender-unique conditions and factors that contribute to an increase in cardiovascular (CV) disease (CVD) risk for women across the lifespan.

Sex-Specific Physiology and CVD

Menarche, menstruation, contraception

Menarche

The age at which a woman experiences menarche influences lifetime risk of CVD.4 Women’s risks of CVD are influenced by their experiences of menstruation and use of contraceptives.5,6 In describing the distribution of age at menarche for Canadian women, Al-Sahab et al. reported that the proportions of women with early (younger than 11.53 years), average (between 11.53 years and 13.91 years), and late menarche (older than 13.91 years) were 14.6%, 68.0%, and 17.4%, respectively.7 Importantly, they noted that variations across the menarche groups were statistically significant according to province of residence, household income, and family type.6 Early and late menarche have been shown to increase the risk of CVD among women.4,6 Hispanic and black women experience an earlier age at menarche than white women.8, 9, 10 In one multicentre cohort study (n = 648) a 4.5 times greater risk of major adverse cardiac events among women with menarche at 10 years of age and younger, and a 2.5 times greater risk of major adverse cardiac events for women with menarche at 15 years and older, compared with those with menarche at 12 years of age was reported.4 There are likely multiple mechanisms that explain the association between age at menarche and CVD. For example, women who experience early menarche have been reported to have higher adult body mass index (BMI), in part because of reduced adult height; increased BMI is independently associated with CVD as well as CVD risk factors.11,12 Later menarche has been linked to PCOS and might be associated with hypercortisolism and estrogen deficiency.4

Menstruation

The characteristics of a woman’s menstruation and the changes that occur over the menstrual cycle have important implications in the assessment of CVD risk factors, manifestations, and treatment. Menstrual cycle irregularity might be a marker of metabolic abnormalities predisposing women to an increased risk of CVD and of CVD risk factors, such as diabetes mellitus.5,13 Furthermore, CVD risk factor measurement including cholesterol, C-reactive protein (CRP), glucose, and insulin can vary throughout the menstrual cycle.14 As a result, the proportion of women identified with CVD risk factors might vary depending on the menstrual phase of evaluation.14,15 For total cholesterol, the mid-follicular phase is recommended for measurement to reduce false negative results. Standardization or timing of measurements to menstrual cycle phase for markers of CRP and insulin sensitivity should be considered to reduce overall variability.14 Interestingly, the menstrual cycle has been shown to affect cardiac autonomic modulation, which decreases during the luteal phase of menstruation, with observed increases in incidence of arrhythmias.15

Contraception

Estrogen-based contraceptives, including implants, injections, patches, vaginal rings, and oral contraceptives have all been reported to increase a woman’s risk of arterial and venous thrombosis.16 Despite their reliability in preventing pregnancies, combined oral contraceptive (COC) therapy has been reported to increase the risk of arterial thrombosis that might result in CV events including myocardial infarction (MI) or stroke.16 CVD risk is further compounded with COC use among women older than 35 years of age: current smoking (10-fold increased risk of MI and threefold increased risk of stroke); the presence of poorly controlled hypertension (threefold risk of MI and stroke, and 15-fold risk of hemorrhagic stroke); or, a history of hypertension in pregnancy (increased risk of MI and venous thromboembolic events).17 Moreover, the risk of CVD depends on the type of progesterone and the dosage of estrogen used, with the safest oral form of hormonal contraception being that which contains levonorgestrel and 30 μg of estrogen.18

Women who present with contraceptive needs must have individualized CVD risk assessment as part of the shared decision-making to determine the optimal contraceptive method. In women older than 35 years of age with numerous CV risk factors, or those with established ischemic heart disease, congestive heart failure, or cerebrovascular conditions, COCs are generally contraindicated, and the recommendation is for progestogen-only contraception, or, preferably, nonhormonal methods.16,19 Finally, in clinical practice particular attention should be paid to women with metabolic syndrome (MetS) or PCOS, who, in addition to their increased CV risk, might require long-term use of contraceptives, with careful monitoring of metabolic effects, and use of alternative nonhormonal contraceptive methods as needed.20,21

Pregnancy-associated risks

Pregnancy poses a physiologic stress on the CV system as it undergoes structural and hemodynamic changes to accommodate the increase in blood volume and hence cardiac output. By 20 weeks’ gestation, cardiac output can increase to > 45% and stroke volume to > 25% of prepregnancy values. Each typically plateau after 20 weeks but remain elevated until delivery.22 Heart rate increases steadily to > 20% pregestation values, and peaks in the third trimester.23 These normal physiologic changes of pregnancy can uncover or intensify prepregnancy cardiac conditions (eg, congenital and valvular heart disease, preexisting cardiomyopathies, including cancer treatment-related cardiotoxicity) or result in new cardiac conditions (eg, arrhythmias, peripartum cardiomyopathy, aortic dissection, and pregnancy-associated MI, including spontaneous coronary artery dissection). In Canada, cardiac diseases affect 4.7 per 100,000 deliveries and is the most common diagnosis associated with maternal mortality during pregnancy and in the postpartum period.24 These adverse outcomes are even higher among women aged older than 40 years, with obesity, and of certain ethnic populations in Canada.

A prospective study of Canadian women with preexisting CVD showed that 50% of serious cardiac events experienced during pregnancy (eg, cardiac arrest or death, MI, urgent cardiac intervention, and serious arrhythmias) were preventable.25 Much of this morbidity and mortality might be avoidable through: optimization of cardiac health before conception, management during pregnancy and postpartum by an experienced interdisciplinary team (eg, cardiology, maternal fetal medicine, obstetrics, and internal medicine), and use of health systems-level interventions that identify women at risk for preventable adverse outcomes (eg, the California Toolkit for Cardiac Disease in Pregnancy and Postpartum26). Further, individualized patient risk assessment using validated tools (eg, Cardiac Disease in Pregnancy [CARPREG] I or II,27 Modified World Health Organization classification of maternal CV risk28) might aid women with known cardiac conditions in planning their pregnancy.

Finally, emerging epidemiologic data show that common reproductive complications such as hypertensive disorders of pregnancy, gestational diabetes mellitus (GDM), preterm birth, abruption, and infertility (in total, occurring in up to 20% of pregnancies in Canada) are independent, sex-specific risk factors associated with marked increases in the risk of future CVD (eg, premature atherosclerotic disease, arrhythmia, and heart failure).29 The recent recognition of the importance of the pregnancy and reproductive period in the CV health of women across their lifetime has led to recent emergence of the multidisciplinary field of “cardio-obstetrics,” including expertise from cardiology and obstetrics within a team approach to enable the optimal management of CVDs and complications during pregnancy.30

Unique considerations of clinical presentation during pregnancy and the postpartum period

An important clinical challenge during pregnancy and the postpartum period is the differentiation between common symptoms of pregnancy (eg, benign dyspnea of pregnancy) and symptoms caused by acute or worsening CVD. Although clinicians generally rely on the physical examination, it is important to note that several laboratory tests (eg, troponin and B-type natriuretic peptide), imaging tests (eg, echocardiogram, radiograph, magnetic resonance imaging, computed tomography), as well as electrocardiogram, Holter monitors, and stress tests, can be done safely in pregnancy to guide diagnosis and management without serious harms to the fetus. Interpretation of test results, however, must recognize that cutoff values for normal results during pregnancy might be different than nonpregnant reference values.

Unique management considerations of CVD during pregnancy

Many common therapies for the treatment and prevention of CVD (eg, aspirin, β-blockers) can be safely used in pregnancy and lactation without adverse effects to the offspring.31,32 Knowledge of specific classes of medications associated with fetal harms that are generally avoided during pregnancy (eg, angiotensin-converting enzyme inhibitors, angiotensin II receptor blockers) should be noted.33 Individualized specialized interdisciplinary counselling and shared decision-making about medication safety during pregnancy and lactation is important with the recognition that clinical decision-making is centred on ensuring maternal well-being.

Current state of preconception-to-postpartum clinical care and research in Canada

At present, most preconception-to-postpartum clinical care for women with CVD, including the postpartum care of women after hypertensive disorders of pregnancy or GDM, occurs in interdisciplinary tertiary care clinics across Canada, depending on local resources. Through the Canadian Adult Congenital Heart Network (www.cachnet.org) and the Canadian Post-Pregnancy Network (www.canadianpostpregnancynetwork.ca), researchers are leading the development of guidelines for clinical care of women from preconception to postpartum.

Polycystic ovary syndrome

PCOS is an endocrine disorder affecting 2.2%-26.7% of women of reproductive ages (15-45 years old).34,35 The prevalence is similar across ethnic groups.36 PCOS is a “syndrome” that affects the ovaries and ovulation and its 3 main features are: cysts in the ovaries; higher than normal levels of androgens with lower levels of estrogen, progesterone, follicle-stimulating hormone, and luteinizing hormone; and, irregular or skipped menstrual cycles. It is believed that PCOS stems from factors including genetics (PCOS runs in families), insulin resistance (because of the preponderance of women with PCOS being obese), and increased levels of inflammation. PCOS is characterized by a greater tendency to obesity,37 central or visceral adiposity,37 and higher rates and degrees of hyperinsulinemia, insulin resistance, increased blood sugars, dyslipidemia, and hypertension.38, 39, 40, 41, 42 Women with PCOS also report higher levels of depression and anxiety.43 Insulin resistance and the resulting hyperinsulinemia38 contribute to the pathophysiology of metabolic complications in PCOS, including MetS,44,45 (dyslipidemia,46,47 impaired glucose tolerance48), type 2 diabetes mellitus,48 and obstructive sleep apnea.49,50 An increased mineralocorticoid effector mechanism has been observed in patients with PCOS, with elevated aldosterone levels and aldosterone to plasma renin activity ratios,51 potentially contributing to elevated blood pressure (BP). These unfavourable metabolic and physiologic complications increase CV risk and women with PCOS are more likely to have increased coronary artery calcium scores and increased carotid intima-media thickness.52

PCOS diagnosis is made from a combination of history, physical, laboratory, and imaging findings, which must include 2 of 3 of the following: high androgen levels (blood tests), irregular menstrual cycles (history consistent with irregular cycles, heavier than normal flow), and cysts in the ovaries (pelvic exam, ultrasound).53 Treatment for PCOS starts with health behaviour modifications including weight loss, diet, and exercise. Hormonal (estrogen and progestin) medications in the form of oral contraceptives, patches, or vaginal rings are used to restore normal hormonal balance, regulate ovulation, and control symptoms. Pharmacologic therapy with metformin has been found useful in symptom and weight management. In a meta-analyses of 12 randomized controlled trials, metformin, when used in addition to health behaviour modifications, was associated with lower BMI, less subcutaneous adipose tissue, and increased number of menstrual cycles at 6 months compared with health behaviour modifications and placebo.54 However, there were no differences in other anthropometric, metabolic (lipids and BP), reproductive, and psychological outcomes after 6 months between lifestyle with metformin vs lifestyle with placebo. To address the mineralocorticoid effector mechanism in PCOS, spironolactone has been used to counteract hyperandrogenism, improve BP, and reduce future CV risk.55

Menopause

Menopause is the permanent cessation of menstruation and is a retrospective diagnosis defined after 12 months of amenorrhea. Median age for natural menopause is 51.4 years in North American Caucasian women, but there are notable ethnic and regional variations. Menopause before the age of 45 years is abnormal, and termed “premature” if younger than 40 years, and “early” if occurring between 40 and 45 years of age; it might be natural (because of primary or secondary ovarian insufficiency) or surgical (after bilateral oophorectomy). Natural menopause results in cessation of ovarian estrogen (primarily 17β-estradiol) production and elevated follicle-stimulating hormone concentrations, whereas the ovary continues to synthesize and secrete testosterone. Surgical menopause leads to loss of ovarian estrogen and testosterone production.56

CVD and menopause

During their reproductive years, women are at lower risk of CVD than age-matched men. This CV “advantage” disappears after menopause.57 A history of frequent menopause-associated vasomotor symptoms (hot flashes and night sweats) has been associated with increased CV risk58; although a recent pooled analysis suggested that severity and timing (occurrence before or after menopause), rather than frequency, were associated with increased CVD risk.59 Data have been conflicting as to whether the type of menopause (natural vs surgical) affects CV risk, but it has long been recognized that the timing of menopause is associated with CV risk. Early (age 40-45 years), and especially premature (age younger than 40 years), menopause are associated with significant increases in morbidity and mortality from ischemic heart disease and ischemic stroke.56,60,61 In a recent cohort study that included 144,260 postmenopausal women, premature menopause, compared with no premature menopause, was associated with a significant increase in risk for a composite CVD outcome that included coronary artery disease (CAD), heart failure, aortic stenosis, mitral regurgitation, atrial fibrillation, ischemic stroke, peripheral artery disease, and venous thromboembolism.62 For natural premature menopause, the hazard ratio was 1.36; for surgical premature menopause, the hazard ratio was 1.87, both after adjustment for conventional CVD risk factors and use of menopausal hormone therapy (MHT).62 In a provocative further analysis of this database, a marker of accelerated atherosclerosis, clonal hematopoiesis of indeterminate potential (CHIP) was explored, and showed that premature menopause, especially natural premature menopause, was independently associated with CHIP among postmenopausal women.63 These findings suggested that natural premature menopause might represent a risk signal for latent genomic instability and predilection to develop CHIP and CHIP-associated CVD. The general recommendation by the North American Menopause Society for women with premature or early menopause (surgical or natural due to primary ovarian failure) is for early initiation of MHT (estrogen, with endometrial protection if the uterus is preserved) to be taken to the average age of natural menopause because of benefits observed in studies for atherosclerosis and CVD, cognition, and dementia.64

Specific CV preventive guidance was provided in the latest (2018) American College of Cardiology/American Heart Association update on guidelines for blood cholesterol management, recognizing premature menopause as a CVD risk-enhancing factor favouring statin therapy initiation.65

The extent to which CVD risk factors across the menopause explain racial/ethnic differences in subclinical vascular disease in late midlife women is not well documented, but was explored in a multiethnic cohort subset of the Study of Women’s Health Across the Nation including 1357 women, with a mean age of 60 years, and free of clinical CVD.66,67 Although race/ethnicity differences in subclinical CVD in late midlife women were identified, with thicker carotid walls in black women, wider arterial diameter in Chinese women, and less carotid plaque in black and Hispanic women compared with white women, the investigators reported that CVD risk factor associations with subclinical vascular measures did not vary according to race/ethnicity except for high-density lipoprotein (HDL) cholesterol on common carotid artery intima-media thickness, wherein an inverse association between HDL cholesterol and common carotid artery intima-media thickness was observed in Chinese and Hispanic but not in white or black women.66

To date, the adverse effects of menopause on CV health have been largely attributed to hypoestrogenemia, as in primary ovarian insufficiency.57,68 These effects include evolution to an atherogenic cardiometabolic profile with increases in total cholesterol, low-density lipoprotein (LDL) cholesterol, and lipoprotein (a) [Lp(a)], and decreased HDL cholesterol, impaired glucose tolerance, elevated BP, and transition to an android adipose tissue distribution (increased central obesity). Additional noncardiometabolic effects include impaired bioactivity of nitric oxide, endothelial dysfunction, perturbation in autonomic function, activation of the renin-angiotensin system, increased oxidative stress, altered mitochondrial function, and changes in inflammatory, coagulation, and fibrinolytic cascades.68 These effects in target tissues depend, at least in part, on the type and density of estrogen receptors (ERs; ER-α, ER-β, and G protein-coupled estrogen receptor 1) and possibly the relative ratios of estrogens/androgens rather than estrogen(s) in isolation.69

Menopausal hormone therapy

The role of MHT in CV health and disease risk remains controversial and complex, influenced by factors that include age at menopause and time since menopause, referred to as the “timing hypothesis,” as well as interactions with a preexisting atherosclerotic vascular substrate.70,71 Of additional importance are the MHT characteristics including hormonal formulation, dose, route of estrogen administration (eg, transdermal, oral, vaginal), whether with or without progesterone (unopposed vs combined estrogen and progesterone), and mode of delivery (cyclical or continuous).56,57,60 Evidence for CV effects of MHT has accrued and evolved over the past several decades.60,72 Large observational studies and meta-analyses published in the 1980s suggested MHT prevented CVD and lowered all-cause mortality.

However, subsequent data from multiple clinical trials, meta-analyses, and post hoc reanalyses have shown contradicting and sometimes conflicting results regarding the role of MHT for prevention of CVD events.73, 74, 75, 76, 77, 78, 79, 80, 81 The general conclusions are that: (1) there is no role for MHT in secondary prevention of CVD; indeed, established atherosclerotic CVD is a contraindication to MHT76; (2) there is no clear indication for MHT in the primary prevention of CVD, except in the clinical situation of premature menopause; and (3) in the absence of contraindications, MHT can be used if administered early (within 10 years of menopause, and age < 60 years old), primarily for vasomotor and and genitourinary indications.

Summary

Consideration of sex, hormonal status, and pregnancy history must all be included in the CV risk assessment, and diagnosis and treatment of women with CVD. Menstruation onset and characteristics, hypertensive or diabetic pregnancy complications, and menopausal timing and treatments are all contributory to CV health and/or disease. An awareness of increased CV risk in women with hypertensive and/or diabetic pregnancy complications, or premature menopause enables inclusion in routine CV risk assessments with appropriate interventions, and intensified assessments and management of traditional risk factors to improve long-term CV outcomes in affected women. Hormonal influences on metabolic and vascular effects might be cardioprotective or disease-promoting, depending on temporal factors, concentration, and proportionality, and whether endogenous or exogenous exposure. The effects of exogenous estrogens (and progesterone) are complex and controversial, influenced by pharmacological and individual patient characteristics. There is currently no evidence to support the use of exogenous MHT for the specific purpose of primary or secondary CV risk prevention in postmenopausal women, except primary CV risk prevention in those with natural or surgical premature or early menopause.

Sex, Gender, and the Disproportionate Effect of “Traditional” CV Risk Factors

Sex and gender differences exist in the prevalence and effects of traditional CVD risk factors, including smoking, diabetes, hypertension, hyperlipidemia, obesity, sedentary behaviour, stress, depression and family history of CVD.82 Moreover, recent data indicate that, from a gender perspective, women face considerable barriers to access care and are less likely to be treated for their cardiac disease or predisposing conditions, or be prescribed CV preventive medications, compared with men.83,84

Astonishingly, these modifiable risk factors account for up to 94% of the population-attributable risks of MI among women.85

Smoking and hypertension

Among women, smoking is the single most important preventable cause of CVD, particularly among women younger than 55 years, increasing their risk sevenfold.86 There is a 25% increased risk in CAD conferred by cigarette smoking among women 45 years and older, compared with men.87 Hypertension is the most prevalent modifiable risk factor for CVD morbidity and mortality in men and women, and markedly increases in severity with age in women, especially those older than 65 years of age, such that the prevalence of hypertension in postmenopausal women is higher than in men.88 However, a recent large population study showed a sexual dimorphism in BP trajectories, with onset of elevation in women as early as the third decade in life, a steeper increase persisting with age, and setting the stage for later-life CVDs that frequently present differently in women vs men.89 Yet more women than men with high BP remain undiagnosed, and even in those taking antihypertensive medications, hypertension has been reported to be less well controlled in women than in men90; a myriad of reasons for this have been suggested including the effect of medication side effects or cost on compliance, lack of health care provider knowledge, and gender bias in treatments.91, 92, 93 An additive interaction between current smoking and hypertension in women on the risk of coronary heart disease (CHD) has been observed in Chinese women, suggesting that the combination of lowering BP and smoking cessation would contribute more to reducing CHD incidence than the effect of each change alone.94

Obesity, diabetes mellitus, and dyslipidemia

Obesity prevalence is rising among Canadian women, and increases with age.95 Rates of overweight and obesity among women in Canada vary significantly across ethnic groups, with lowest prevalence in South Asian and Southeast Asian women, and highest prevalence among black and off-reserve Indigenous women.96 Risks of CVD increase fourfold among women in the highest BMI category compared with women in the normal BMI range and, in the Framingham Heart Study, obesity increased the risk of CAD by 64%.87 Obesity among women increases their risk of diabetes mellitus and women with diabetes have a threefold excess risk of fatal CAD compared with women without diabetes.87,97 Recognizing the importance of accumulated weight gain over a woman’s lifespan, the recently published “Pregnancy and Maternal Obesity Part 2: Team Planning for Delivery and Postpartum Care” guideline summarizes that increased gestational weight gain and decreased postpregnancy weight loss increase a women’s lifetime risks of obesity, and encourage achievement of healthy weight pre- and postpartum.98

Elevated total cholesterol, triglycerides, and LDL cholesterol levels, and decreased HDL cholesterol level are independent atherosclerotic risk factors for CVD.99 In women, dyslipidemia contributes the highest proportion of the incidence of CVD (population attributable risk, 47.1%) compared with all other traditional risk factors for CVD.87 These differences in lipid and glucose metabolism might be because of alterations in reproductive hormone levels during midlife (40-59 years). 100,101 Among women, CRP is recognized as a strong CVD risk factor; indeed, screening of CRP among women aged 60 years and older has been recommended.102, 103, 104 Specifically among women, CRP might be a stronger predictor of future CVD than LDL cholesterol levels, and CRP and LDL are reported to identify different groups of women at higher risk of CVD.102,103 Lp(a) remains a controversial and unfolding genetic risk factor in the development of CV and calcific aortic valve diseases.105,106 Uncertainty remains as to whether elevated Lp(a) is associated with the development of preeclampsia during pregnancy.107 Very high Lp(a) values have been deemed an independent risk factor in women for MI and in recurrent CHD events for postmenopausal women.108,109 In other studies, elevated Lp(a) increases CVD risk in women only when paired with high total cholesterol and/or elevated LDL cholesterol, and/or apolipoprotein B.110, 111, 112, 113 Despite a similar recommended approach to treatment of dyslipidemia, many studies have shown that women are less likely to be prescribed lipid-lowering therapies or to achieve recommended cholesterol goals when treated compared with men’s outcomes.90 This lack of adherence to treatment guidelines and failure to obtain recommended treatment goals contributes to women’s poorer outcomes; moreover, this disparate treatment enhances the perception of bias in treating women with known cardiac risk factors and/or manifest CVD.90

Physical activity and diet

Across all ages and all times of the day, Canadian women are less physically active than men and report less time spent in moderate-to-vigorous and light physical activity, and greater time spent in sedentary activities,114,115 which are well established risk factors for CVD.116,117 Further, physical fitness might play a more significant role in limiting CVD development among women.118,119 Data from the Nurses Health Study showed that diets high in red and processed meats, high-fat dairy products, fried foods, salt, refined grains, and sugar increased heart disease risk among women,120 whereas adherence to a low-risk lifestyle, defined as not smoking, BMI < 25, exercise ≥ 30 minutes per day, and top 40% of the Alternate Mediterranean Diet Score (emphasizing high intake of vegetables, fruits, nuts, legumes, whole grains, fish, and moderate intake of alcohol) was associated with a lower risk of CHD and sudden cardiac death in women.121 It is more than 20 years now that these health behaviour approaches were initially proposed as an effective strategy for the prevention of CHD and sudden cardiac death in women.

Family history

It is recommended that all individuals, including men and women, with a family history of premature CVD should be targeted for CV risk reduction interventions. Family history of CVD is an independent risk factor for premature CHD and is defined as patients having a first-degree relative with CHD at age younger than 55 years for men and/or younger than 65 years for women. Although it has been shown that women with a low Framingham Risk Score and a family history of premature CHD have a high prevalence of subclinical coronary atherosclerosis,122 the widely used American College of Cardiology/American Heart Association Atherosclerotic Cardiovascular Disease Risk Estimator,123 developed with pooled cohort equations from several large cohort studies of white and black men and women and which has largely supplanted the Framingham Risk Score, includes gender, age, BP, tobacco use, cholesterol, race, and diabetes status, but does not include family history.

Emerging Novel CV Risk Factors and Their Effect on Women

Autoimmune rheumatic diseases

Systemic inflammation characterizes autoimmune rheumatic diseases (ARDs), including rheumatoid arthritis (RA) and systemic lupus erythematosus, which affect 8% of the population, of whom most (approximately 80%) are women.124 CV morbidity and mortality risks are greater for those with ARDs compared with the general population and with those with CAD.125,126 RA is often considered a CV risk equivalent to diabetes in terms of endothelial damage125,127 and clinical atherosclerosis,128 with increased risk for heart failure and sudden cardiac arrest.124,126 In addition to atherosclerotic CAD and related complications, ARDs are associated with inflammatory complications of the myocardium, pericardium, valves, and vasculature and/or conduction system.128 CVD manifestations have also been described in patients with Sjögren syndrome, a rheumatic autoimmune disease that primarily affects women in midlife and might occur alone or in association with other autoimmune diseases, most commonly lupus and RA.129

The effect of ARDs on CV risk and CVD manifestations in women include: premature development of CAD 10 years earlier than age- and sex-matched controls128; increased risk of accelerated atherosclerosis with silent clinical presentation leading to heart failure124; up to 70% increased risk of MI130; 50% increased relative risk of recurrent ischemic events after percutaneous coronary interventions131,132; and worse health-related quality of life compared with healthy populations.133 Additionally, MetS is more prevalent in women of reproductive age with systemic lupus erythematosus.134 Awareness of the association between ARDs and CVD in women supports the importance of aggressive treatment with disease-modifying antirheumatic drugs (to reduce systemic inflammation), management of CVD risk factors, and careful monitoring for manifestations of CVD.

Interplay of ARD symptoms and treatment in CVD diagnosis and risk

ARDs can present with symptoms that are difficult to differentiate from the clinical symptoms of CVD: chest, jaw and neck, shoulder, and back pain, fatigue, and dyspnea. These symptoms are often misinterpreted by practitioners, and women themselves, as being attributed to an ARD, thereby increasing the potential risk for adverse cardiac events.135 Women with ARDs also present with other comorbid conditions, including depression,136 which might also affect CVD risk. Beyond atherosclerotic or inflammatory CAD and/or spasm, systemic inflammation in ARDs might cause myopericarditis, microvascular disease, vasculitis, valvular heart disease, and heart failure with preserved ejection fraction due to myocardial fibrotic changes.

RA-specific risk calculators using an empiric correction factor have not been successful in accurate prediction of CVD risk in patients with RA137; however, a recently developed tool evaluated in a population of > 30,000 RA patients (78% female), using clinical data and a multibiomarker disease activity score was shown to have good predictive accuracy, with a net reclassification index of 0.19 (95% confidence interval, 0.10-0.27;) and C-index of 0.715.138 Importantly, despite ARDs predominantly occurring in women, men are often treated more intensively than women and women experience longer delays in referral to specialist care than men.139

Summary

ARDs primarily affect women, and systemic inflammation associated with ARDs increases the risk of premature atherosclerotic CVD in addition to disorders of the myopericardium, valves, and conduction system. Cardiac symptoms can be misinterpreted as being related to an ARD, or can be absent, despite underlying disease; therefore, careful clinical assessments, including attention to CV risk factors, and early specialist referral as indicated for symptomatology indicative of disease, is recommended.

Depression

Depression is a disorder that ranges from a mild downturn in mood in reaction to everyday life events, to a genetically predisposed, biochemically-mediated severe disorder that can render the person unable to function, become psychotic, or suicidal.140 Symptoms might commonly include low mood, loss of interest, sleep impairment, appetite disturbance, concentration and memory difficulties, with occasional progression to an inability to function at home, work, or in the community.140 Depression can be clinically assessed, diagnosed, and classified by using the Diagnostic and Statistical Manual of Mental Disorders, Fifth Revision140 or International Classification of Diseases, 10th Revision141 criteria. Several clinician or self-administered validated depression scales (Beck Depression Inventory-II142; Hospital Anxiety and Depression Scale143,144; Hamilton Depression Rating Scale145; Geriatric Depression Scale146; Patient Health Questionnaire-9147; Cardiac Depression Scale148) are frequently used to assess depressive symptoms. In the general population, the prevalence of major depression is 1.7- to 2.0-fold higher in women (5.5%) than in men (3.2%).149 This is thought to be related to hormonal, biological, and psychosocial factors.149, 150, 151, 152

Depression and CVD risk

For women, in particular, having a depression history is increasingly seen to be associated with CVD development.152,153 In one study, depressed women had a risk ratio of CVD development of 1.73 compared with nondepressed women.154 Depression has been reported to increase a woman’s risk for adverse cardiac events by 50%-70%.155 In the National Health and Nutrition Examination Survey III longitudinal study of adults aged younger than 40 years, women with a history of depression or suicide attempts had greater risk of developing CVD or ischemic heart disease than their male counterparts.156 Similarly, young women (48%) have been reported to have a higher rate of long-term depression/depressive symptoms than men (24%) at the time of MI.157 For postmenopausal women without previously diagnosed CHD, depressive symptoms have been associated with fatal CHD.158

Several sex- and gender-related explanations have been proposed for the apparent correlation between depression and CVD in women, including biological and behavioural factors, as well as socioeconomic and psychosocial stressors and vulnerabilities.152 For example, women are more likely to be physically inactive,159 and to experience lower levels of control at work and lower earnings, work overload due to additional housework and child care, single parenthood resulting in increased financial strain, loss of spouse in older age, and subsequent decrease in financial resources, and additional caregiving roles (eg, older parents).152 Additionally, for men and women, the CVD–depression relationship is increasingly seen as being bidirectional (depression leads to CVD and CVD to depression).152,153 In this regard, after a cardiac diagnosis, individuals have a higher incidence of depression than is found in the general population.153 Rates of depression after a cardiac diagnosis can be up to twice as high for women compared with men.152,160,161 Women diagnosed with a cardiac condition before the age of 60 years might be at particularly high risk for depression after their diagnosis, with rates substantially higher than in their male counterparts (39% vs 22%).160

Quality of life

Women and men who experience depression after a cardiac diagnosis have a poorer quality of life than their nondepressed counterparts.153,162 This includes having a lower rate of return to work and a higher frequency of quitting work.163,164 Depressed cardiac patients have an overall worse medical prognosis, and have been reported to be rehospitalized sooner, with more frequent and longer hospitalizations.165 Post-MI depression, specifically, is associated with a 1.6- to 2.7-fold increase in the risk of adverse outcomes, including all-cause mortality, cardiac mortality, and cardiac morbidity within 2 years of diagnosis.166 One-year mortality after MI is higher for depressed individuals than for nondepressed individuals, in women (8.3% vs 2.7%) and men (7.0% vs 2.4%).167

Health outcomes and quality of life for depressed women with a cardiac history are worse than for depressed men and nondepressed women. After coronary artery bypass surgery, women with a history of depression experience inferior improvement in functional status 6 months postsurgery compared with nondepressed women and depressed men.168 Depressed women with low social integration are at higher risk of recurrent cardiac events compared with nondepressed socially integrated women.169 Outpatient women with chronic heart failure report lower self-perceived quality of life and higher depression rates compared with their male counterparts (64% vs 44%, respectively). 170

Treatment of depression in primary and secondary prevention of CVD

Treating depression before the development of CHD has been shown to reduce the long-term absolute risk of serious CV events (MI or stroke) by 19%.171 Although there is no direct evidence that screening for depression leads to improved outcomes in CV populations, depression has been linked with increased morbidity and mortality, poorer risk factor modification, lower rates of cardiac rehabilitation, and reduced quality of life.172, 173, 174 Therefore, the American Heart Association 2008 advisory on depression and CHD emphasized the importance of assessing depression in cardiac patients with the goal of targeting those most in need of treatment and support services.175 Jha et al. published a State-of-the-Art Review of screening and management of depression in patients with CVD to reinforce screening and best practices in medicine.176 It is recommended that screening for depressive symptoms with referral to interdisciplinary follow-up be completed with all newly diagnosed cardiac patients174,175 and that psychological supports be integrated into cardiac rehabilitation programs to improve depression outcomes.177

Kidney disease

Globally, chronic kidney disease (CKD) is more prevalent in women compared with men.178,179 There is a strong inverse relationship between level of kidney function and CV risk, and not only is the slope of the risk relationship steeper for women, but increased CV risk is shown earlier in the CKD disease course.180 Highlighting the importance of addressing CKD as a CVD risk factor, the 2015 Global Burden of Disease study estimated that 19 million disability-adjusted life-years, 18 million years of life, and 1.2 million deaths lost from CVD were directly attributable to reduced kidney function.181

Sex differences

Women have lower absolute glomerular filtration rates and renin-angiotensin system activity compared with men.182 Endogenous estrogen is associated with lower BP in women, 69 though the effects of exogenous estrogen on kidney function, BP, and CV outcomes is less clear.183 Pregnancy complications such as gestational hypertension, GDM, and preeclampsia increase risk of CKD progression.184 Women have slower age-related loss of kidney function compared with men, likely because of sex differences, including less age-related renal nitric oxide dependence, but also gender-related factors such as greater adherence to kidney-related dietary restrictions in women.185,186 Parental history of CVD is a stronger risk factor in women compared with men for CKD progression.187

Most formulae to estimate kidney function are on the basis of serum creatinine, which in turn is influenced by factors such as muscle mass and protein intake. Muscle mass is less in women and creatinine-based formulae incorporate sex as a variable to estimate glomerular filtration rate188 and the risk of progression to kidney failure requiring dialysis or transplantation.189 Angiotensin-converting enzyme inhibitors and angiotensin receptor blockers in the treatment of hypertension might be less effective in women.190 In contrast to the general population, definitions of CKD-associated anemia are not sex-specific, which might lead to overestimation and overtreatment of anemia in women, a concern because erythropoiesis-stimulating agents carry some CV risk.191 In addition, women are less likely to receive arteriovenous fistulae for hemodialysis,192 and predialysis fistula creation attempts might be associated with a lower risk of sudden death and CV mortality.193 Women receiving dialysis have a similar mortality rate as age-matched men receiving dialysis,178 however, overestimation of dialysis adequacy has been reported to be due to overestimation of lean body mass in women, and higher dialysis doses have been associated with lower mortality among women but not men.194

Gender differences

From a gender perspective, women have slower loss of kidney function and are more likely to choose conservative care; women are less likely to initiate dialysis or receive a kidney transplantation.193 Living kidney donation is more common in women.195 Whether kidney donation increases CV risk remains under study196,197; however, among women of reproductive age, living kidney donors have increased rates of gestational hypertension and preeclampsia.198

Breast cancer therapies

Breast cancer is the most common malignancy among women worldwide199 and it is estimated that 1.0% of the female Canadian population are survivors of breast cancer diagnosed within the past 15 years.200 As a result of significant improvements in screening and treatment, breast cancer mortality rates in Canada have had a steady decline of nearly 50% over the past 4 decades. 201 With improvements in breast cancer-specific survival, CVD has emerged as an important competing risk in this population.202 Women with a personal history of breast cancer are at greater risk of dying from CVD than women without breast cancer, and for older women (older than 65 years) with a history of breast cancer, CVD is the leading cause of death.202,203

CVD risk and breast cancer therapies

Among women with a history of breast cancer, the balance of CV health with mortality can be influenced by a number of risk and protective factors that begin before diagnosis and extend to the post-treatment survivorship period, but active breast cancer treatment likely has the largest effect.204 CV risks that might predate cancer diagnosis include older age, presence of traditional CV risk factors, and inflammation, whereas potential prediagnosis protective factors include lifelong non-smoking, regular physical activity, a healthy diet, and healthy body weight. A number of therapies used to treat breast cancer including anthracycline-based chemotherapy regimens, trastuzumab targeted therapy, and radiation therapy (especially for left-sided breast cancer) can cause cardiac and potentially vascular toxicity and dysfunction.205 Initial presentation of CV toxicity varies widely with individual treatment types, doses, and combinations, but can eventually manifest as heart failure, ischemic heart disease, and ultimately CVD-related death.206

Health behaviour changes after breast cancer diagnosis

“Lifestyle” toxicity (ie, the worsening of health behaviours including physical activity and cardiorespiratory fitness, diet, body weight, stress) is a less recognized, but equally as common consequence of breast cancer therapy that contributes to CVD risk in this population.207 Potential protective factors during breast cancer therapy include maintenance or improvement of healthy lifestyle behaviours and prophylactic heart failure medications.208,209 After completion of treatment, practicing healthy lifestyle behaviours continues to be a key protective factor. The potential for chemotherapy-induced early menopause among women who were premenopausal at diagnosis (approximately 20% in developed countries) is an additional important CV risk that should be considered in the post-treatment setting.210

Sex-Based Pharmacology of CV Drugs

Women and men have differences in pharmacokinetics of absorption, distribution, metabolism, and excretion of drugs, as well as pharmacodynamics of receptor binding, post-receptor effects, and chemical interactions of drugs.211 Many factors contribute to observed sex differences in CVD drug pharmacology. For example, if a drug is given transdermally, the dose received by a woman might be lower than that received by a man due to higher subcutaneous fat content in women.212 Similarly, differences in levels of gastric enzymes and transporter proteins between men and women cause differences in drug absorption. Drug distribution is affected by numerous parameters that differ between men and women, including BMI, body fat, plasma volume, and body water.213 However, sex differences in pharmacokinetics might be associated with adverse drug reactions in women because of higher blood concentrations and longer elimination times, rather than simply explained by differences in BMI.211

Many uncertainties regarding sex differences in CVD drug pharmacology are attributed to lack of data because of the under-representation of women in randomized clinical drug trials, a recurring issue that affects women in all aspects of CVD: diagnosis, acute treatment, short- and long-term pharmaceutical treatment, and prognosis.214 Trial exclusion criteria often explicitly list women of reproductive age in the exclusion criteria because of the potential for congenital malformations and litigation concerns. Furthermore, there were concerns that fluctuations in hormonal levels during the menstrual cycle could confound interpretation of drug pharmacokinetics.215 Although the US Food and Drug Administration and Health Canada regulations have advanced the inclusion of women and the analyses of sex differences in drug and device treatment responses, women’s participation in clinical trials has improved in some, but not in all CVD areas. In their 2018 review of the participation of women in clinical trials of CV drugs, Scott et al. reported that although women were well represented in trials of drugs for hypertension and atrial fibrillation, representation of women in trials for heart failure, CAD, and acute coronary syndromes fell well below the participation to prevalence ratio deemed appropriate.214 Interestingly, the authors did not find evidence to support the concept that the inclusion or exclusion criteria were responsible for the under-representation of women in CVD trials, but rather postulated that low enrollment might be because gender-based issues limiting participation including familial responsibilities, cultural and socio-economic barriers, difficulty accessing the study site, and concerns about study risks.

Because of the increasing focus on precision medicine, the consideration of the patients’ sex in clinical decision-making including the choice of diagnostic testing, medications, and other treatments is imperative.216 Many medications are metabolized differently in women compared with men because of differences in body size and distribution volumes, sex hormone levels, activity of enzymes, and effects of routes of excretion on sex-specific responses to drugs.217 At a minimum, there is a strong need for pharmaceutical trialists to report data disaggregated according to sex, even if underpowered, to enable subsequent pooling of sex-specific data during meta-analysis.

Conclusions

As shown in Figure 2, CVD risks can vary across a woman’s lifespan, depending on her biologic stage (ie, puberty, pregnancy, and menopause). Similarly, differential CV risks are associated with traditional atherosclerotic risk factors as well as autoimmune and depressive disorders, which are more commonly found in women. Clinicians must consider sex-specific manifestations of comorbid disease processes, including ARDs, breast cancer, and kidney disease, on CV risks. Further, treatments are affected through sex-specific biological differences in metabolism of CVD drug and/or device therapies. All of these underlying medical factors and treatment-related issues need to be approached through the lens of sex and gender to improve CVD outcomes in women.

Figure 2.

Figure 2

The average age of onset and average length of exposure to sex-unique and traditional factors that contribute to increased cardiovascular risk across a woman’s lifespan.

Acknowledgements

The authors gratefully acknowledge Lisa Comber for her ongoing coordination of this Atlas. A special thanks goes to Alexa Desjarlais from the University of Calgary and Manu Sandhu and Angela Poitras from the University of Ottawa Heart Institute for their graphic design of the central chapter illustration. Thanks to Manu Sandhu for graphic design of Figure 2. This article has been submitted on behalf of the CWHHA, a pan-Canadian network of approximately 100 clinicians, scientists, allied health professionals, program administrators, and patient partners, whose aim is to develop and disseminate evidence-informed strategies to transform clinical practice and enhance collaborative action on women’s CV health in Canada. The CWHHA is powered by the Canadian Women’s Heart Health Centre at the University of Ottawa Heart Institute.

Funding Sources

Supported by the University of Ottawa Heart Institute Foundation.

Disclosures

S.L.M. is a member of the Novo Nordisk SOUL trial steering committee. A.L.E.L. has received grants from Astra Zeneca. The remaining authors have no conflicts of interest to disclose.

Footnotes

Ethics Statement: The research reported has adhered to the relevant ethical guidelines.

See page 125 for disclosure information.

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