Abstract
The need for patient-centered care has become a focal point of healthcare improvement initiatives. Shared decision making—in which patients and clinicians communicate about various treatment options and goals and patient input is considered when making treatment decisions—has been associated with improved health and quality of life. A method of treatment evaluation allowing incorporation of patient-specific goals and perspectives is of increasing interest to healthcare providers, payers, and patients. An approach that allows incorporation of shared goal setting is possible via use of an instrument called the Goal Attainment Scale (GAS). This scale provides the structure for measuring progress toward treatment goals set through patient–clinician collaboration. The goal attainment approach has been used as a primary outcomes measure in numerous studies but not in major depressive disorder (MDD). As MDD is a complex, multidimensional disorder affecting each patient differently, the use of GAS methodology is a relevant framework for setting personalized meaningful treatment goals. Initial research into the feasibility of using the GAS in MDD (GAS-D) to measure patient-centric outcomes that may be neglected when more traditional scales are used has been encouraging. The objective of this Commentary is to provide background and rationale for implementation of the GAS-D in clinical practice.
Funding Takeda Pharmaceutical Company, Ltd., and Lundbeck LLC.
Keywords: Goal Attainment Scale, Patient-centered care, Shared decision making, Vortioxetine
Patient-Centered Care
Clinical practice has been increasingly focused on incorporation of the patient voice. This has led to the need to develop assessments that more closely capture outcomes that are relevant to the patient, rather than simply inventories of classic symptoms. Historically, outcomes of major depressive disorder (MDD) have been evaluated using standardized clinician rating scales, such as the Hamilton Depression Rating Scale (HAM-D) or the Montgomery–Åsberg Depression Rating Scale (MADRS) [1, 2]. Because these measures are traditional symptom inventories assessing fixed constructs, such as sadness, sleep difficulty, anhedonia, or pessimistic/suicidal thoughts, they may not capture the most meaningful outcomes from the perspective of individual patients. Each patient is likely to have a different perspective on which symptomology is most troublesome and what represents treatment success. The focus of this paper is to describe the rationale and development of a more specific, patient-tailored instrument for depression, namely, the adaptation of the Goal Attainment Scale (GAS) for depression, the GAS-D. Data supporting this development have been published elsewhere and are reviewed within this Commentary. This article is based on previously conducted studies and does not contain any studies with human participants or animals performed by any of the authors.
The evolution of personalized medicine, namely, a medical model based on tailoring a therapeutic strategy to the characteristics of an individual at the time of treatment [3], has resulted in changes in the clinical encounter. While one component of personalized care may focus on a patient’s physiological or genetic characteristics to guide treatment selection, other aspects of personalized care might involve a more holistic approach to a patient’s situation. As part of continuous improvement in health care, clinicians are endeavoring to more actively involve their patients and families in decisions about their care to achieve outcomes desired by the patient, focusing on treatment effectiveness and achieving what the patient considers to be a meaningful outcome [4]. This approach is actively supported in the current climate, where organizations such as the European Union (and individual member countries), the World Health Organization, and the Institute of Medicine recommend that healthcare providers (HCPs) practice patient-centered care [3, 5–7]. Increased patient engagement with shared decision making between the patient and clinician is associated with better patient experience, health, and quality of life, and better economic outcomes [1, 7, 8]. In addition, a recent guidance document issued by the Food and Drug Administration recommends consideration of patients’ perspectives in the overall benefit–risk profile for treatments and in the decision-making process before product approvals [9]. These guidance documents highlight the need for patient-centered care. Conversation between the patient and clinician should be encouraged above and beyond the simple provision of information and options [10].
However, delivering patient-centered care also requires training and a formal framework to be effective [8]. Although patient-centered care starts at a systems level, it is important to cultivate a culture that encourages HCP–patient communication, engagement of patients in the treatment decision-making process, and the assessment of treatment outcomes using both patient-reported and clinical measures [11]. Furthermore, eliciting patients’ preferences and values can be difficult, variable across time, and influenced by the methodology used to assess those preferences and values.
Current Outcome Measures for MDD: Patient vs Clinician Assessment of Remission
MDD spans multiple domains of functioning; patients experience emotional, physical, and cognitive symptoms [12]. MDD affects more than 300 million individuals globally, and its impact is burdensome. Worldwide, it is the leading cause of disability [13].
A focus of MDD treatment has been on achieving remission, with recovery from all symptoms [14]. Approximately half of all patients with MDD do not respond to first-line antidepressants [15]. Even among those who do experience some relief or remission from depressive symptoms, complete remission with full functional recovery may not always be achieved with drug therapy and/or psychotherapy [14, 16].
Although patients’ and clinicians’ treatment objectives may appear equivalent in that both aim for remission, or in plain English, treatment success, their definitions of remission and how remission may be measured are not equivalent [17]. Common rating scales used to define remission in a clinical trial or clinical practice setting may focus on depressive symptoms but not on a return to a pre-morbid level of functioning [18]. It is feasible that on tracking a patient’s score over time, a clinician may believe that the patient is in remission, while the patient may continue to experience a low level of symptoms and may not consider himself/herself to have achieved a full functional recovery [19, 20].
Patients consider many domains to be important in achieving remission in addition to mood-related symptoms, including features of positive mental health, coping ability, functioning, and a general sense of well-being and satisfaction with their lives [21]. Depressed patients may also cite other mental health characteristics, such as feeling like one’s normal self, when considering remission status [18]. For example, in a study in which the treatment goals of depressed outpatients were examined, researchers found that most goals related to the patients’ day-to-day functioning, including improvements in family/social relationships, increases in positive health behaviors, and finding a job or organizing their homes [22].
Given the variations in the definition of “treatment success”, flexible measures are important. A single rating scale that can capture the heterogeneity of MDD does not exist, whether it is because of insufficient item coverage or the need for certain signs, symptoms, or desired outcomes to be assessed by clinical observation, clinical interview, or patient self-report [23]. Clinicians may want to consider a broader conceptualization of functional and symptom-based outcomes to guide them in their treatment decision making [18]. The approach of shared decision making between the patient and clinician for the evaluation of progress toward remission allows flexibility in defining and measuring a successful treatment outcome.
The Goal Attainment Approach
The Goal Attainment Scale (GAS)
With the disease treatment landscape becoming more patient-centric, an individualized approach to evaluating a treatment intervention is of great interest to all healthcare stakeholders [24]. One measurement tool, the GAS, allows a patient to work jointly with his/her HCP to set up individualized treatment goals. These goals may differ from patient to patient, but the goal attainment approach offers a standardized assessment of a treatment intervention in a heterogeneous group of patients [24, 25].
The GAS was first introduced in 1968 by Kiresuk and Sherman and was intended for use in the evaluation of mental health services [26]. Since then, the GAS has been used in a broad range of healthcare and non-healthcare applications, such as mental health, education and social service, rehabilitation, randomized clinical trials in neuroscience, and geriatrics [24, 27–30].
Goal Setting and Scoring
Use of the GAS involves a semiquantitative approach, characterized by first identifying problems specific to an individual patient, and then framing these problems into goals that are specific, measurable, attainable, relevant, and time-bound (SMART) [24, 25, 31]. The HCP typically would work with his/her patient to develop treatment goals, which are then scaled using a basic evaluation design with outcomes ranging from the least to the most favorable [26]. For example, possible values may include − 2, − 1, 0, 1, and 2, where − 2 signifies baseline performance, 0 denotes targeted performance achieved, and 2 denotes outstanding goal achievement (Fig. 1) [26]. Each individual’s progress toward goal attainment can then be converted into a standardized T score [26]. This method allows for assignment of a single score for a patient with multiple goals and permits comparisons between patients and between treatment modes [26]. Thus, although GAS methodology is typically applied at an individual level to measure goal attainment, results may also be analyzed at a group level.
Implementation of GAS Methodology Across Therapeutic Disciplines
Ruble et al. [27] analyzed data from two randomized clinical trials that used the goal attainment approach to assess whether a parent–teacher consultation/planning framework was effective in helping children with autism meet their educational goals. Their intention was to evaluate specific assumptions about GAS scoring, comparability across groups, and whether scores were reliable and comparable when applying different behavioral observation methods. Indeed, the researchers found that scores were reliably coded and stressed the importance of study personnel practicing goal writing and development, setting goals at study onset, and testing for goal equivalency prior to study initiation to ensure methodological quality [27].
In an exploratory pilot study, the GAS was integrated into a work-related behavioral intervention for chronically depressed individuals with persistent work dysfunction as a way to structure the treatment intervention and track progress toward desired outcomes. Examples of desired outcomes included goals relating to work or school, such as finding a job or improving productivity, as well as health-related goals, such as weight loss or taking care of medical problems [32]. For the majority of patients, improvements in work functioning and in the ability to meet social and interpersonal goals were realized, and the GAS was determined to be an appropriate tool for tracking individual progress toward predetermined goals [32].
The GAS also demonstrated utility as a primary outcome measure to assess clinically meaningful progress toward goals preset by patients/caregivers and their treating physicians in a 12-month open-label trial of donepezil hydrochloride in 108 patients with Alzheimer disease [29]. GAS scores were shown to correlate modestly with standard outcome measures. However, the authors concluded that the GAS was most valuable when incorporating patient preferences alongside other standard measures, allowing for a broader understanding of treatment benefit [29].
The responsiveness of the GAS in measuring outcomes is likely related to its design, offering greater sensitivity and covering more domains than standard measures [30]. In a randomized, double-blind trial of a specialized intervention targeted at frail, community-dwelling elderly adults, the GAS was more responsive than other standard measures of functional improvement, such as the Comprehensive Geriatric Assessment (CGA) [30]. The GAS was able to detect differences in a patient’s function, safety, activity, and medication use that standard measures failed to capture [30]. Furthermore, the authors maintain that the study’s randomized, double-blind design is the strongest argument against any suggestion that the GAS may be over-responsive or measures trivial changes of little clinical importance [30].
This small sampling of applications of the GAS approach illustrates its potential for assessing patient-desired outcomes across a range of therapeutic disciplines and practical applications.
Need for Patient-Centric, Goal-Oriented Approach in MDD
Each patient with MDD tends to have a unique view of their disease severity, comorbidities, and treatment needs. Efforts to define desired treatment outcomes with patients may reveal cultural differences and the impact of any stigma associated with mental illness [33]. A patient-centered approach that incorporates the patient’s desires, values, and preferences into a personalized treatment plan encourages communication between the patient and his/her HCP and is an essential aspect of collaborative care [34, 35].
Efforts to incorporate treatment goals have been attempted in some instances of care for patients with depression, but not in a systematic manner such as the GAS-D allows. Improved clinical outcomes have been reported in the management of comorbid depression when care coaches were used to promote patient-centric self-efficacy and optimal patient care [36]. Furthermore, goal-focused interventions, such as goal setting and planning, have proven to be useful for patients with depression because they serve to increase their levels of well-being and reduce depressive symptoms [37]. In addition, in the primary care setting, there seems to be a large degree of variation in the extent to which shared decision making is experienced by depressed patients; elderly patients and those who have been in treatment for an extended amount of time (6 weeks or more) were less likely to report participation in shared decision making [35]. Certainly, compared with clinical studies of depression treatments, the opportunity for extended dialogue between the patient and clinician may be limited in clinical practice. The opportunity to utilize the GAS approach in the primary care setting should allow for a structured clinical backdrop or framework in which shared decision making can exist. With increased patient input, it is more likely that goals set will be meaningful and that even minor progress detected may be of great significance to the patient [24].
Adapting the GAS for Depression (GAS-D)
Feasibility of Using the GAS for MDD
In a recent study to evaluate whether the GAS approach would be feasible in MDD, patients were surveyed using the PatientsLikeMe (PLM) platform, a patient-powered online network that allows for real-time patient input into clinical research [38]. This survey study aimed to better understand the experiences of patients with MDD in clinical goal setting and demonstrated that although patients had treatment goals, they rarely used any formal goal-setting process [39]. This study also aimed to learn about patients’ receptiveness toward the GAS approach by describing treatment goal-setting methods within various domains, providing examples, and describing how the goals would be jointly determined by patients and their clinicians, as well as how they are benchmarked and scored. An example of the GAS adapted for the subdomain relating to social functioning (Fig. 2) was also presented in order to gain feedback. In response to the example presented, patients noted that they saw value in the GAS approach because it would allow them to give input into the design of their treatment plans and provide a backdrop against which progress could be measured [39].
Electronic versions of the GAS are being developed to facilitate shared decision making and progress assessment. As these efforts begin to extend across therapeutic indications and clinicians’ familiarity with this methodology increases, it is believed that the goal attainment approach will become more accessible, and thus used more frequently to help patients reach their goals successfully.
GAS-D and Patient-Centric Research
The goal attainment approach offers a number of advantages compared with traditional clinical or patient-reported measures because it permits assessment of patient-centric outcomes that may be neglected when traditional clinical or patient-reported scales are used [40].
Involving patients and their families in treatment decisions and the goal-setting process can motivate patients to become more involved in their treatment and may support the development of more realistic goals [41]. In addition, certain drawbacks observed with traditional outcome measures may be overcome. For instance, “floor” and “ceiling” effects may be avoided, because the goal attainment approach itself is designed to measure a range of expected treatment outcomes, limiting the chance for observed effects to fall outside the range of measurement [41]. Furthermore, the problem of reduced sensitivity to capturing clinically significant change may also be avoided, because items assessed are inherently important to the patient without being overshadowed by items included in the traditional outcome measures that may not reflect an individual patient’s presentation and/or are of lesser importance to the patient [41].
Successful implementation and validation of the GAS-D should allow for continued and increased use of this tool in both the clinical research and clinical practice settings, providing another measure for within- and between-group comparisons of patients with regard to treatment success. In addition, the GAS-D may offer a valuable framework by which clinicians and patients in real-world clinical practice can work together to establish meaningful treatment goals and quantify progress toward these goals [40].
The GAS-D has been implemented in a recently completed clinical study (NCT02972632) as a primary outcome measure intended to assess the progress of participants toward achieving their individual goals after a change in antidepressant medication for the treatment of MDD [40]. To the best of our knowledge, this is the first study to use GAS-D as the primary outcome measure to assess achievement of patient-centric outcomes in MDD, and both primary and secondary GAS-D endpoints are being evaluated for consistency with outcomes assessed using more traditional measures.
Conclusions
Increased awareness of the need for patient-centric care and shared decision making may serve to drive the development of new, or adaptation of existing, tools to aid both patients and their clinicians in treatment evaluation that goes beyond the traditional focus on clinical symptom improvement. The goal attainment approach is a promising methodology that allows patients to work with their HCPs in setting individualized meaningful treatment goals. This approach allows for the assessment of patient-centric outcomes that may be neglected when more traditional assessment scales are used. The heterogeneous nature of MDD lends itself to the goal attainment approach, which ensures that goals set are relevant to each patient’s symptomatology and are reflective of overall improvement in MDD.
Acknowledgements
The authors thank Jennifer Schuster of Takeda Pharmaceuticals for her contributions to this manuscript.
Funding
Article processing charges were funded by Takeda Pharmaceutical Company, Ltd., and Lundbeck LLC. All authors had full access to all of the references cited in this manuscript and take complete responsibility for the interpretation of any data presented here.
Medical Writing and/or Editorial Assistance
Editorial assistance in the preparation of this article was provided by Sharon J. Hirshey Dirksen, PhD, of inVentiv Medical Communications, LLC, a Syneos Health™ group company. Support for this assistance was funded by Takeda Pharmaceutical Company, Ltd. (Deerfield, IL, USA) and Lundbeck LLC (Deerfield, IL, USA).
Authorship
All named authors meet the International Committee of Medical Journal Editors (ICMJE) criteria for authorship for this article, take responsibility for the integrity of the work as a whole, and have given their approval for this version to be published.
Authorship Contributions
MM, SVP, SS, CF, AE, LM, and MO contributed to the conceptual design, and MM, AE, SS, MO, and SVP contributed to the methodological design. MM, LM, and MO completed the literature search, literature review, and data extraction. MM, SS, AE, CC, BWL, SVP, and MO participated in the analysis and interpretation of results. MM drafted the manuscript, and all authors critically revised the manuscript for important intellectual content. All authors approved the final version to be published and agree to be accountable for all aspects of the work.
Disclosures
Maggie McCue is an employee of Takeda Pharmaceuticals USA, Inc. Sara Sarkey is an employee of Takeda Pharmaceuticals USA, Inc. Charlie Cao is an employee of Takeda Pharmaceuticals USA, Inc. and Jennifer Schuster is an employee of Takeda Pharmaceuticals USA, Inc. Anna Eramo is an employee of Lundbeck LLC. Clément François was an employee of Lundbeck LLC. Lisa Mucha was an employee of Takeda Pharmaceuticals, USA, Inc. Sagar Parikh is a consultant to Takeda and Sunovion, has a research contract with Assurex Health, and owns shares in Mensante Corporation. Mark Opler is an employee of MedAvante-ProPhase. Briana Webber Lind is an employee of MedAvante-ProPhase.
Compliance with Ethics Guidelines
This article is based on previously conducted studies and does not contain any studies with human participants or animals performed by any of the authors.
Footnotes
Enhanced Digital Features
To view enhanced digital features for this article go to 10.6084/m9.figshare.9258965.
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