Abstract
Background
The impact of metabolic syndrome on female sexual dysfunction received modest consideration in clinical practice. The aim of the research was to analyze the international literature to determine the relationship between the metabolic syndrome, its components and female sexual disorders.
Methods
We identified relevant full-length papers by electronic databases as Index Medicus/Medline, Scopus, Life Science Journals, from 2005 to the present. Studies were searched using the following as search query: metabolic syndrome, female sexual dysfunction, obesity, systemic arterial hypertension, diabetes mellitus, dyslipidemia.
Results
Women with metabolic syndrome showed higher prevalence of sexual inactivity and low sexual desire, orgasm and satisfaction respect to women without metabolic syndrome. Particularly metabolic components as diabetes mellitus, dy-slipidemia, systemic arterial hypertension were strongly associated with lower sexual desire, activity and Female Sexual Function Index total score. In contrast, other studies showed no relationship.
Conclusion
Our study showed that in the clinical evaluation of women with metabolic syndrome routine inquiring about female sexual dysfunction should be recommended to ameliorate sexual function and quality of life. However more prospective and longitudinal studies on the sexual effects of metabolic syndrome should also be suggested to know the factors related to women's sexuality better.
Key Words: Metabolic syndrome, Female sexual dysfunction, Obesity, Systemic arterial hypertension, Diabetes mellitus, Dyslipidemia
Introduction
Female sexual dysfunction (FSD) is a complex and growing health problem. However the result is often underestimated. A large international clinical study showed that 39% of sexually active women presented at least one sexual disorder [1] and, especially in postmenopausal women, this prevalence ranges between 25 and 79% [2,3,4].
FSD was defined as the difficulty in sexual response cycle as genital arousal disorder, female orgasmic disorder, hypoactive sexual desire, causing negative impact on quality of life and personal relationships [5,6,7].
Sexual dysfunctions related to metabolic alterations receive modest consideration and limited research in clinical practice, especially in women, but their evaluation could reveal serious cardiovascular diseases, such as cerebrovascular diseases, coronary artery disease and peripheral arterial vascular disease, with increased morbidity and mortality, mostly in menopausal women [8,9].
Several definitions of metabolic syndrome (MS) have been proposed and have been changing since 1998, including the World Health Organization; the National Cholesterol Education Program's Adult Treatment Panel III Report; the American Heart Association and the National Heart, Lung and Blood Institutes; and the International Diabetes Federation [10,11,12,13]. Overall in the varying accepted definitions, MS was defined by a cluster of medical comorbidities, including central obesity, insulin resistance, impaired glucose metabolism, dyslipidemia (hypertriglyceridemia, low high-density lipoprotein cholesterol), and systemic arterial hypertension [14]. MS and its components were related to increased risk of several pathological conditions as diabetes mellitus, cardiovascular diseases, polycystic ovarian syndrome, obstructive sleep apnea, fatty liver disease, cancer, primary antiphospholipid syndrome and other rheumatic diseases as systemic lupus erythematosus, rheumatoid arthritis, systemic sclerosis and fibromyalgia [15,16,17,18,19,20,21,22,23,24].
The aim of the research was to analyze the international literature to determine the relationship between the MS, its components and female sexual disorders.
Materials and Methods
Identification of Studies
We identified relevant full-length papers by electronic databases as Index Medicus/Medline, Scopus, Life Science Journals, from 2005 to the present.
Studies were found using the following key words: female sexual dysfunction, metabolic syndrome, obesity, systemic arterial hypertension, diabetes mellitus, and dyslipidemia. Supplementary papers were searched by reference of relevant papers screened for significant dates. Two independent scientists reviewed the articles in detail to examine only articles that analyze critically the relationship between MS and FSD.
Inclusion Criteria
Working independently, reviewers evaluated all eligible studies in full text. To be included articles had to (1) evaluate the association between MS and FSD; (2) contain an original data analysis and (3) from a peer-reviewed journal. Articles were excluded if the clinical study (1) presented only as a case report or had in-appropriate design; (2) did not analyze a reciprocal relationship between MS and FSD or MS components and FSD.
Data Extraction and Quality Assessment
For each study were examined: study design, demographic characteristics, sample size, quality of study, outcomes relating to assessment of sexual activity and MS. Copies of all selected and included articles were found and archived for lecture in full. Due to significant heterogeneity of clinical studies we not pooled the data in a meta-analysis, but in a tabular summary. Results were reported in the following categories: (1) MS and FSD; (2) systemic arterial hypertension and FSD; (3) obesity and FSD; (4) dyslipidemia and FSD; (5) diabetes mellitus and FSD.
Results
Description of Studies
Total 35 studies met the inclusion criteria (Table 1, 2) [2,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58]. Sixteen studies were classified as case-control studies [2,28,29,32,37,38,39,41,42,44,47,49,51,52,54,57] and the rest as observational/cross-sectional studies. The number of participants ranged from 88 to 2,270 women. Only 9 studies looked specifically at MS [2,25,26,27,28,29,30,31,32]. The remaining included data about components of MS [2,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58].
Table 1.
Study design | Population | Assessment of sexual activity | Main results |
---|---|---|---|
The Rancho Bernardo study [25] | 376 postmenopausal women | FSFI | MS was associated with low sexual activity, desire, arousal, orgasm and satisfaction |
Observational, cross-sectional study [26] | 111 postmenopausal women | FSFI | no relationship between MS and FSD |
Cross-sectional cohort study [27] | 256 menopausal women | – | no relationship between MS and FSD in menopausal women |
Case-control study [28] | 204 premenopausal women | FSFI FSDS MHQ |
MS was associated with a higher prevalence of FSD, lower desire, arousal, lubrication and orgasm compared with controls. A significant correlation between increasing number of MS component and FSD was found |
Case-control study [29] | 195 postmenopausal women | FSFI | MS was associated in postmenopausal women with a higher prevalence of FSD, lower desire, arousal, lubrication, orgasm and satisfaction |
Case-control study [2] | 208 postmenopausal women | FSFI FSDS MHQ |
MS was associated in postmenopausal women with a higher prevalence of FSD, an increased risk of lower lubrication, satisfaction arousal, orgasm |
Cross-sectional study [30] | 773 women | FSFI | no relationship between MS and FSD in middle- to old-aged women |
Cohort study [31] | 538 pre- and post-menopausal women | 23-item FSD questionnaire | MS was associated only in premenopausal women with an increased risk of FSD, particularly reduced sexual desire |
Case-control study [32] | 200 premenopausal women | FSFI | MS was associated in premenopausal women with a higher prevalence of lower scores on the FSFI, predominantly in the sexual satisfaction |
FSDS = Female sexual distress scale; FSFI = female sexual function index; MHQ = middlesex hospital questionnaire.
Table 2.
Study design | MS components | Population | Assessment of sexual activity | Main results |
---|---|---|---|---|
Systolic blood pressure intervention trial (SPRINT) [33] | systemic arterial hypertension | 635 postmenopausal women | FSFI | systemic arterial hypertension was not associated with FSD |
Observational, prospective, cross-sectional descriptive study [34] | systemic arterial hypertension | 157 postmenopausal women | FSFI | hypertension was related to sexual dysfunction |
Cohort study [35] | systemic arterial hypertension | 540 postmenopausal women | FSFI | significant association between systemic arterial hypertension and FSD |
Cohort study [36] | systemic arterial hypertension | 1,390 postmenopausal women | – | systemic arterial hypertension was not associated with FSD |
Case-control study [37] | systemic arterial hypertension | 417 pre- and post-menopausal women | FSFI | FSD was present in 42.1% of hypotensive women and 19.4% of normotensive women |
Case-control study [38] | obesity | 120 pre- and post-menopausal women | Iranian version of FSFI | obesity was related to female sexual dysfunction |
Case-control study [39] | obesity | 91 premenopausal women | FSFI | no significant relationship between obesity and FSD |
Population-based study [40] | obesity | 1,266 pre- and post-menopausal women | FSFI | no significant association between obesity and FSD |
Case-control study [41] | dyslipidemia | 466 pre- and post-menopausal women | FSFI FSDS MHQ |
dyslipidemia was associated with FSD |
Case-control study [2] | dyslipidemia | 208 menopausal women | FSFI FSDS MHQ |
hypertriglyceridemia was linked to FSD |
Case-control study [42] | dyslipidemia | 556 premenopausal women | FSFI | women with hyperlipidemia had lower arousal, orgasm, lubrication, and satisfaction |
Cross-sectional study [43] | diabetesmellitus | 236 premenopausal women | FSFI | FSD was present in both type 1 and type 2 diabetesmellitus |
Case-control study [44] | type 2 diabetes mellitus | 260 premenopausal women | FSFI | type 2 diabetes was associated with lower sexual desire, arousal, lubrication, orgasm, sexual satisfaction |
Diabetes control and complications trial/epidemiology of diabetes interventions and complications study (DCCT/EDIC) [45] | type 1 diabetes mellitus | 580 pre- and post-menopausal women | FSFI | type 1 diabetes with autonomic neuropathy was associated with FSD |
Cross-sectional single-center study [46] | type 2 diabetes mellitus | 93 pre- and post-menopausal women | FSFI | type 2 diabetes was associated with arousal, desire, lubrication, orgasm, satisfaction problems and pain during sexual intercourse |
Case-control study [47] | type 1 diabetes mellitus | 170 pre- and post-menopausal women | FSFI FSDS |
type 1 diabetes was significantly associated with higher FSD frequency |
Cross-sectional study [48] | type 2 diabetes mellitus | 150 premenopausal women | FSFI | type 2 diabetes mellitus was significantly associated with reduced lubrication, sexual desire, arousal problems, dyspareunia, orgasmic dysfunction |
Case-control study [49] | type 1 and type 2 diabetes mellitus | 118 premenopausal women | FSFI | type 1, but not type 2 diabetes mellitus was associated with FSD, particularly lubrication, arousal, orgasm, dyspareunia |
Cross-sectional study [50] | type 2 diabetes mellitus | 110 pre- and post-menopausal women | FSFI | type 2 diabetes mellitus was significantly associated with FSD |
Case-control study [51] | type 1 diabetes mellitus | 200 premenopausal women | FSFI | diabetes mellitus was significantly associated with FSD |
Case-control study [52] | type 2 diabetes mellitus | 222 pre- and post-menopausal women | FSFI | type 2 diabetes mellitus was significantly associated with FSD |
Cross-sectional study [53] | diabetes mellitus | 2,270 pre- and post-menopausal women | FSFI | insulin-treated diabetes mellitus was associated to FSD, particularly reduced lubrication and orgasm |
Case-control study [54] | type 1 diabetes mellitus | 144 pre- and post-menopausal women | FSFI | no significant relationship between type 1 diabetesmellitus and FSD |
Cross-section study [55] | diabetes mellitus | 544 pre- and post-menopausal women | FSFI | diabetesMellituswas associated with orgasmic dysfunctions |
Cross-section study [56] | diabetes mellitus | 1,291 pre- and post-menopausal women | BACH FSFI | type 1 diabetes mellitus was associated with greater pain with sexual intercourse. Type 2 diabetes was related to better orgasm scores and satisfaction |
Case-control study [57] | diabetesmellitus | 88 pre- and post-menopausal women | FSFI | significant relationship between type 1 diabetes mellitus and FSD |
Prospective cohort study [58] | type 1 diabetes mellitus | 652 pre- and post-menopausal women | FSFI | type 1 diabetes mellitus was associated with loss of libido, orgasm disorders, lubrication and arousal and pain |
FSDS = Female sexual distress scale; FSFI = female sexual function index; MHQ = middlesex hospital questionnaire; BACH FSFI = Boston Area Community Health Survey Female Sexual Function Index.
Women with MS showed higher prevalence of sexual inactivity and low sexual desire, orgasm and satisfaction respect to women without MS. Particularly metabolic components as diabetes mellitus, dyslipidemia, systemic arterial hypertension and obesity were strongly associated with lower sexual desire, activity and Female Sexual Function Index total score in pre- and post-menopausal women.
Principally women with systemic arterial hypertension presented a greater rate of FSD, evaluated by the Female Sexual Function Index questionnaire, versus nor-motensive women (90 and 41% respectively) and the use of antihypertensive medications was significantly related to lower prevalence of FSD [2,25,34,35,37].
Furthermore, in sexual active women FSD prevalence was greater in female with dyslipidemia, particularly hyperlipidemia and low high-density lipoprotein cholesterol, compared to normolipidemic women, independently from menopausal status and with direct relationship with cardiovascular disease [2,41,42].
Similarly diabetes mellitus and diabetes medications were associated with FSD, specifically lubrication and orgasm disorders, induced by vascular changes in the pelvis and neuropathic alterations in genital arousal, directly related to glycemic control and duration of diabetes [43,44,45,46,47,48,49,50,51,52,53].
It's possible also that diabetes mellitus caused a greater risk of vaginal infections, particularly recurrent Candidiasis, responsible of increased risk for dyspareunia.
In contrast, other studies showed no relationship between MS and FSD or metabolic components, particularly obesity, especially in postmenopausal women [26,27,30,39,40,54].
Discussion
Female sexual function showed a combination of endocrine, vascular and neuromuscular factors that regulate important steps of female sexual reaction as increased genital blood flow, enlarged clitoral diameter and length, increased vaginal luminal diameter and lubrication, wall engorgement [59,60].
Pelvic vascular injury and neuropathy induced by some metabolic factors as dyslipidemia, glucose intolerance, insulin resistance, diabetes mellitus, and systemic arterial hypertension could cause clitoral insufficiency and reduced vaginal engorgement resulting in vasculogenic FSD [37,59,60,61,62,63]. In particular obesity, as the result of excessive accumulation of body fat, is strongly associated with MS. The development of fat cells (i.e. adipocytes) is known as adipogenesis. The adipogenesis is a continuous process even in adult adipose tissue for the presence of preadipocytes that can proliferate and differentiate [64]. Adipose tissue is not a simple energy storage organ, but exerts important endocrine and immune functions; it provides a link between MS, inflammation, cardiovascular, immune disorders and cancer [65,66,67,68,69].
Therefore MS and its components may influence and associate with the female sexual function through the chronic vascular inflammation, oxidative stress and atherosclerosis, which also can impair the genital blood flow and the oxygen supply to the female pelvis, especially in severe MS, impairing some domains of the female sexuality [8,26,70].
Nevertheless some studies showed no relationship between MS and FSD or metabolic components, particularly obesity, especially in postmenopausal women.
In general, the statistical power and importance of results obtained from these studies evaluating the relationship between MS and FSD could be further discussed because the largest part included a small number of participants, include a short follow-up period, or show evident selection bias (e.g. only voluntary patients attended a screening clinic, menopausal women etc.) and confounding factors as behavioral, psychological (e.g. depression, body image, relationship with a partner etc.) and social risk factors (e.g. low socioeconomic status).
Conclusion
Overall our study showed that in the clinical evaluation of women with MS and its components, routine inquiring about FSD should be recommended to ameliorate sexual function and quality of life index. However more prospective and longitudinal studies on the sexual effects of MS should also be suggested to evaluate the relationship between FSD, MS and its components and to better know the factors related to women's sexuality.
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