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STATE-OF-THE-ART PAPER

The epidemiology, pathophysiology, and management of psychosocial risk factors in cardiac practice

The emerging field of behavioral cardiology

Alan Rozanski, MD, FACC^*,*, James A. Blumenthal, PhD, Karina W. Davidson, PhD, Patrice G. Saab, PhD and Laura Kubzansky, PhD^||

^* Division of Cardiology, St Luke's-Roosevelt Hospital Center, and the Department of Medicine, Columbia University College of Physicians and Surgeons, New York, New York
Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina
Division of General Medicine, Columbia College of Physicians and Surgeons, and Cardiovascular Institute, Mount Sinai School of Medicine, New York, New York
Department of Psychology, University of Miami, Coral Gables, Florida
^|| Department of Society, Human Development and Health, Harvard School of Public Health, Boston, Massachusetts

Manuscript received September 29, 2004; accepted October 6, 2004.

^* Reprint requests and correspondence: Dr. Alan Rozanski, Division of Cardiology, St. Luke's-Roosevelt Hospital Center, 1111 Amsterdam Avenue, New York, New York 10025 (Email: AR77{at}columbia.edu).

	Abstract

Top Abstract Epidemiology Pathophysiology Factors linking psychosocial... Identification and management of... The emerging field of... References

 
Observational studies indicate that psychologic factors strongly influence the course of coronary artery disease (CAD). In this review, we examine new epidemiologic evidence for the association between psychosocial risk factors and CAD, identify pathologic mechanisms that may be responsible for this association, and describe a paradigm for studying positive psychologic factors that may act as a buffer. Because psychosocial risk factors are highly prevalent and are associated with unhealthy lifestyles, we describe the potential role of cardiologists in managing such factors. Management approaches include routinely screening for psychosocial risk factors, referring patients with severe psychologic distress to behavioral specialists, and directly treating patients with milder forms of psychologic distress with brief targeted interventions. A number of behavioral interventions have been evaluated for their ability to reduce adverse cardiac events among patients presenting with psychosocial risk factors. Although the efficacy of stand-alone psychosocial interventions remains unclear, both exercise and multifactorial cardiac rehabilitation with psychosocial interventions have demonstrated a reduction in cardiac events. Furthermore, recent data suggest that psychopharmacologic interventions may also be effective. Despite these promising findings, clinical practice guidelines for managing psychosocial risk factors in cardiac practice are lacking. Thus, we review new approaches to improve the delivery of behavioral services and patient adherence to behavioral recommendations. These efforts are part of an emerging field of behavioral cardiology, which is based on the understanding that psychosocial and behavioral risk factors for CAD are not only highly interrelated, but also require a sophisticated health care delivery system to optimize their effectiveness.

Abbreviations and Acronyms   CAD = coronary artery disease   HPA = hypothalamic-pituitary-adrenocorticol   MI = myocardial infarction   SES = socioeconomic status   SSRI = selective serotonin reuptake inhibitor   PET = positron emission tomography

	Epidemiology

Top Abstract Epidemiology Pathophysiology Factors linking psychosocial... Identification and management of... The emerging field of... References

 
Psychosocial factors that promote atherosclerosis and adverse cardiac events can be divided into two general categories: emotional factors and chronic stressors. Emotional factors include affective disorders such as major depression and anxiety disorders as well as hostility and anger. Chronic stressors include factors such as low social support, low socioeconomic status, work stress, marital stress, and caregiver strain.

Emotional factors.   Among emotional factors, depression has been most studied in recent years. Depressive disorders vary from mild (subclinical) depressive symptoms to classic major depression. According to the Diagnostic and Statistical Manual of Mental Disorders-4th edition, depression is characterized by severely depressed mood and/or anhedonia (inability to take pleasure in life) that lasts for two weeks or more and is accompanied by significant functional impairment and somatic complaints. Research in this area has evaluated the effects of depression in both initially healthy individuals and in patients with known CAD. Depression plays a role in promoting CAD events in both cohorts (1). Most epidemiologic studies have primarily assessed depressive symptoms rather than major depression. Data indicate the presence of a strong consistent gradient between the level of depressive symptoms and the likelihood of adverse cardiac events, beginning at relatively low levels of depressive symptoms (2) (Fig. 1). Such data suggest that the pathophysiologic effects of depression may be triggered by even mild subclinical symptoms.

View larger version (18K): [in this window] [in a new window]   Figure 1 Post-myocardial infarction (MI) patients were recruited and assigned to one of four categories based on the Beck Depression Inventory (BDI), ranging from no depressive symptoms (BDI <5) to moderate to severe depressive symptoms (BDI 19). During the five-year follow-up period, a gradient relationship was observed between the magnitude of depressive symptoms and the frequency of deaths, with increased events occurring even in patients with mild depressive symptoms (BDI 5 to 9) (2).

Epidemiologic studies have also considered two other emotional factors relative to prognosis: anxiety and anger/hostility. Those that have examined the risk of cardiovascular outcomes associated with anxiety disorders are limited. Three large studies have shown a significant relationship between phobias and sudden cardiac death (1), but data linking other forms of anxiety to CAD are relatively scant or conflicting and more work is needed. Although hostility and chronic anger have been linked to cardiovascular outcomes in a number of studies, results have been generally mixed. Several factors may contribute to inconsistent findings in this area. Measures used to assess anger and hostility have varied widely, making it difficult to compare results. A recent study suggests that there is some self-denial and lack of self-awareness associated with self-reported hostility (4). This may be overcome by using a structured interview approach (4), but the approach has not been widely tested. Interestingly, a number of recent studies have demonstrated a relationship between hostility or anger and measurements of subclinical atherosclerosis (5–8) and also have linked hostility to progression of atherosclerosis during serial coronary angiography (9). Such findings suggest that hostility and chronic anger merit further study as potential psychosocial risk factors.

Chronic stressors.   A variety of adverse life circumstances that promote chronic stress have been evaluated for their relationship to adverse cardiac outcomes. For instance, whereas the presence of high levels of social support is known to promote psychologic and physical well being, a consistent literature indicates that low levels of social support are health damaging. Although historically there has been little integration of differing theories of social support, there is increasing agreement that social support can be divided into two broad categories: social networks, which describe the size, structure, and frequency of contact with the network of people surrounding an individual; and functional support, which may be further divided into received social support, which highlights the type and amount of resources provided by the social network, and perceived social support, which focuses on the subjective satisfaction with available support or the perception that support would be available if needed. Received and perceived social support are often further delineated by type, including instrumental (e.g., help getting tangible tasks done), financial (economic support), informational (providing needed information), appraisal (help evaluating a situation), and emotional support (e.g., providing emotional support, feelings of being loved). The term "tangible support" also is used to describe types of support that are readily seen or quantified, such as instrumental or financial support. Both inadequate structural and functional support have been consistently linked to the occurrence of cardiac death and all-cause mortality in many studies (1). For example, low structural support has been associated with increased mortality within cardiac populations, including such factors as living alone (10), lacking a confidant (11), and suffering from social isolation (12). Furthermore, low emotional support (13), lack of available support (14), and low perceived social support (15) also have been associated with increased mortality, and preliminary evidence suggests that functional support may be more important than structured support in cardiac populations (16). As with depression, a strong and consistent inverse gradient consistently characterizes the relationship between the magnitude of social support and adverse clinical outcomes among both initially healthy subjects and those with known CAD (1).

Socioeconomic status (SES), generally characterized as a composite of factors such as occupational status, economic resources, education, and social status, has also attracted attention because longitudinal studies indicate a strong inverse gradient between SES level and adverse cardiac events. Low SES is characteristically accompanied by poorer health habits and higher frequencies of coronary risk factors, which account for half or less of the SES-CAD gradient (17). More financial hardship, poorer housing conditions, and increased levels of chronic stress also characterize low SES, as does poorer and more physically repetitious working conditions and less job security and job latitude (17). Thus, low SES can be viewed as a composite chronic psychologic stressor (18), a perspective that is supported by pathophysiologic evidence. Hypothalamic-pituitary-adrenal (HPA) dysfunction frequently accompanies chronic stress, and increased dysfunction is observed as SES levels decline. For example, this relationship has been documented by an inverse relationship between SES levels and measurements of cortisol variability (more variability being healthy) and measurements of central obesity (19).

Work stress is another form of chronic stress that has been increasingly studied for its potential adverse cardiovascular effects. Various aspects of work stress have been studied, but two leading epidemiologic models have received the most attention (Fig. 2). One model is the "job strain" model developed by Karasek et al. (20), in which individuals are evaluated according to two factors: "job demand" and "job latitude." Individuals with high job demand but low job latitude are categorized as being under "job strain," performing excessive routine work with a lack of creative outlets or a sense of rigid confinement. The other model is the effort-reward imbalance model developed by Siegrist et al. (21), but extensively evaluated so far only in Europe. In this model, job "effort" is compared with job "reward," with effort measured in terms of either extrinsic demands (e.g., having a demanding employer) or one's intrinsic pattern of responding to work demands, and rewards measured in terms of financial incentive, self-esteem, career opportunity, or security. Three lines of evidence link work stress to adverse clinical outcomes. First, an increasing epidemiologic literature indicates that job strain and effort-reward imbalance (22–25), as well as other work parameters (26–28), are associated with an increased frequency of adverse clinical outcomes. Both the job strain and effort-reward imbalance model appear comparable for their ability to predict adverse events (25). Second, work parameters, such as low job control, account for a substantial portion of the inverse gradient noted between SES status and cardiovascular disease (17). Third, several recent studies have also linked work stress to measures of subclinical atherosclerosis (29–31), with findings varying between genders and/or among ethnic groups (30,31). Because most epidemiologic studies that showed an association between work stress and adverse clinical outcomes have focused primarily on white men, prospective studies in women and other ethnic groups are needed.

View larger version (38K): [in this window] [in a new window]   Figure 2 Two leading conceptual models of work stress. In the job strain model (left), the amount of job demand and decision latitude determines the degree of job strain. High demand but low decision latitude characterizes job strain. In the effort-reward imbalance model (right), increased job effort may result from either extrinsic demands or personal overcommitment, and "reward" may occur in the form of money, recognition, prestige, security, or career opportunities. High effort with low reward characterizes job imbalance.

View larger version (20K): [in this window] [in a new window]   Figure 3 Postmenopausal females (n = 390) were divided into those in satisfying marriages (left of each panel), unmarried (middle of each panel), and in low-satisfying marriages (right of each panel). After 11 years of follow-up, the women in satisfied marriages had the lowest and the women in unsatisfying marriages had the highest percentage of significant plaque (left panel). Serial carotid ultrasonography was performed after three years in a subgroup of this patient population (n = 206) and revealed that women in low-satisfying marriages also had the greatest progression of plaque during follow-up (right panel). Reprinted with permission from Gallo et al. Psychosom Med 2003;65:952–62 (34). *Groups differ significantly at p < 0.05.

Clustering of psychosocial risk factors.   Although we have discussed emotional factors and chronic stressors as separate entities, they frequently cluster. For example, individuals who experience job strain tend to have higher rates of depression compared to those who do not report strain (38). The strong overlap between chronic stress and emotional factors suggests that any life situation that has the capacity to evoke chronic negative emotional responses may promote heart disease. For instance, a recent study found that childhood maltreatment (39) was associated with a significant increase in both depression and cardiovascular disease among adult women. Similarly, exposures ranging from the death of a child to adverse wartime experiences may potentially affect the risk of CAD development and should be candidates for study.

Comparison of psychosocial risk factors with traditional CAD risk factors.   The characterization of psychosocial risk factors as "major" CAD risk factors has been debated. However, more consistent and reproducible outcome studies confirm that psychosocial risk factors such as depression, poor social support, and low SES represent potent CAD risk factors. Furthermore, many reported studies now link psychosocial risk factors to the presence of subclinical atherosclerosis or its progression, as measured by carotid ultrasonography (5–8,29–31,34,40,41). Meta-analyses of psychosocial studies have been limited by the use of varying measures and inconsistent methods for calculating risk ratios. However, a recent meta-analysis of outcomes associated with depressive symptoms indicates a relative risk that is comparable to those noted for traditional CAD risk factors reported from the Framingham study (Fig. 4) (3,42).

View larger version (20K): [in this window] [in a new window]   Figure 4 The risk ratios for traditional risk factors reported for men in the Framingham study (28). The risk ratios for depressive symptoms and clinical depression are from a recent meta-analysis by Rugulies et al. (3). The risk ratios for traditional risk factors are for death due to cardiac disease, myocardial infarction, coronary artery insufficiency, and development of angina. For depressive symptoms and clinical depression, the risk ratios are for death due to cardiac disease and myocardial infarction. CI = confidence interval; HT = hypertension; LDL = low-density lipoprotein; HDL = high-density lipoprotein.

View larger version (25K): [in this window] [in a new window]   Figure 5 Risk of acute myocardial infarction for men and women for each of nine coronary artery disease (CAD) risk factors evaluated in the international INTERHEART case-control study. Results are adjusted for age, gender, and geographic location. The prevalence of each CAD risk factor is presented for controls and cases in the third and fourth columns; prevalence rates are not calculated for the psychosocial (PS) index as it is derived from a statistical model. Reprinted with permission from Yusuf et al. Lancet 2004;364:937–52 (43). Abd = abdominal; CI = confidence interval; Curr = current; OR = odds ratio; PAR = population-attributable risk; Smok = smoking; Veg = vegetables.

Future epidemiologic directions.   In contrast to the data linking negative emotional states and chronic stress to CAD, the potential protective effect of positive psychologic factors has not been extensively investigated. Building on work in other areas, we suggest that one potential direction for clinical investigations in this neglected area could be to explore the notion of flexibility as it relates to mental health (44). In the physical domain, the ability to demonstrate variability in response to stressors may be associated with better clinical outcomes (45). Similarly, having the capacity to respond to situations in a variety of different ways (i.e., to flexibly adapt one's emotional and coping responses to any given situation) may be associated with better mental health. We consider three psychologic components that may be central to developing emotional and coping flexibility (Fig. 6). One key component is "vitality," which refers to the presence of energy and enthusiasm and a sense of aliveness (46). It is characterized by two positive emotions, joy and interest, and is fueled by both a sense of purpose and a sense of self-worth. Vitality may be considered both restorative and regenerative and, as such, connotes a sense of freshness and positive excitement. Conversely, when someone lacks vitality, the likelihood of becoming excited and investing energy toward goals and in interactions with others is diminished. The availability of this energy promotes two key adaptive responses (which may in turn promote vitality): development of various positive response mechanisms (such as patience, discipline, and maintaining friendships) and emotional competence, or the ability to regulate emotions across a range of situations (47). An important aspect of emotional competence is the ability to either enhance or suppress emotional expression, a trait that may be termed "emotional flexibility," as discussed by Bonanno et al. (48) and others.

View larger version (38K): [in this window] [in a new window]   Figure 6 The mental health paradigm in which individuals who have a strong sense of purpose coupled with a sense of self-worth derive benefit in terms of a greater sense of vitality. The positive emotion associated with vitality provides energy needed to develop and maintain greater emotional competence and positive response mechanisms. In turn, the presence of emotional competence and positive response mechanisms provide a stabilizing force for maintaining a sense of vitality.

Early emotional theorists suggested that positive emotions such as joy might provide recuperative power. Support for this concept is provided by recent data showing that positive psychologic factors can dampen physiologic reactivity to negative emotional stimuli (50). Similarly, individuals who score high on the trait of forgiveness (51) or who are provided with social support (52) demonstrate lower heart rate and blood pressure elevations during laboratory mental stress. Other data indicate that positive emotions can enhance immune function (53). Evaluation of the impact of positive psychologic factors upon clinical outcomes is also limited and recent. In the largest study to date, Kubzansky et al. (54) conducted a 10-year follow-up study of 1,306 men from the Normative Aging Study, who were assessed for optimistic versus pessimistic "explanatory style" (i.e., how one explains the causes of bad events). Stratification of individuals according to optimistic, neutral, and pessimistic explanatory styles revealed a gradient relationship between levels of optimism and cardiac outcomes, with optimism halving the risk for cardiac events. A separate measure of dispositional optimism has been linked to more favorable outcomes following bypass surgery (55). A strong relationship has also been noted between positive emotions and longevity in the long-term follow-up of nuns whose diaries in early adult life were assessed for positive emotional content (56). Such findings suggest the value of further exploring positive psychologic factors that may promote health or protect against disease.

	Pathophysiology

Top Abstract Epidemiology Pathophysiology Factors linking psychosocial... Identification and management of... The emerging field of... References

 
Emotional disturbance and chronic stress can have a profound impact on the central nervous system, including increased output from the sympathetic nervous system and the HPA axis. Chronic stimulation from these central outputs can induce a wide variety of pathophysiologic responses, as displayed in Figure 7. Depression has been particularly studied in this regard. Chronic stimulation of the HPA axis by depression frequently results in hypercortisolemia, blunted HPA activity, and diminished feedback control, as evidenced by nonsuppression of cortisol secretion following dexamethasone suppression. When present, hypercortisolemia is associated with suppression of growth and sex hormones. Heightened stimulation of the sympathetic nervous system is also common in depression and is associated with higher concentrations of circulating plasma norepinephrine and an increase in total body sympathetic activity (57). As a consequence, depressed patients commonly manifest higher resting heart rates than healthy controls and exhibit autonomic nervous system dysfunction, including diminished heart rate variability, baroreflex dysfunction, and increased QT variability (57).

View larger version (59K): [in this window] [in a new window]   Figure 7 Pathophysiologic mechanisms by which chronic stress and affective disorders, such as depression, appear to promote atherosclerosis. These stressors activate the hypothalamic-pituitary-adrenal (HPA) axis and the sympathetic nervous system (SNS) and affect behaviors. Multiple adverse peripheral effects can ensue from this neuroendocrine, sympathetic, and behavioral activation, as shown. The neuroendocrine and neuroplastic changes emanating from these stressors can also induce a state of heightened physiologic responsivity to acute stress which may interact with chronic stressors to cause more adverse effects. ANS = autonomic nervous system; Endo. = endothelial.

Future research directions.   Because other psychosocial risk factors have not yet been investigated as extensively as depression, the full spectrum of their pathophysiologic effects requires further study. In addition, we highlight three areas where clinical observations provide new research directions. First, the observation that cardiac event rates increase when psychosocial risk factors cluster has focused interest on explanatory mechanisms. Whether this increase is due to greater overall stress or the synergistic effects of stressors that evoke different pathophysiologies needs to be determined. The latter possibility is supported by recent data indicating distinct pathophysiologic differences according to the exposure of Watanabe Heritable Hyperlipidemic rabbits to two different chronic stressors: an unstable social environment versus social isolation. Both forms of stress produced more atherosclerosis compared to a control group, but the groups exposed to different forms of stress exhibited different metabolic consequences and patterns of accrued atherosclerosis (64).

Second, various data suggest links between chronic psychologic distress and certain adverse behaviors, such as overeating (65,66). New technologies that study brain function suggest that such links may be centrally mediated. Immunohistochemistry has been used to identify an anatomic chronic stress response network, localized to several specific brain centers, in a rat model of chronic stress (67). Whereas glucocorticoids help end acute stress responses by exerting negative feedback upon the HPA axis, glucocorticoids occupy central glucocorticoid receptors during chronic stress, with resultant activation of the chronic stress response network, including continued glucocorticoid production, in these experimental animals (66,67). This combination of chronic stress and high glucocorticoid levels appears to stimulate a preferential desire to ingest sweet and fatty foods (66). Further study indicates that glucocorticoids affect dopaminergic transmission in areas of the brain associated with motivation and reward (68). Positron emission tomography (PET) has been used to identify the presence of diminished dopamine D₂ binding potential within midbrain systems under conditions of chronic stress in the cynomolgus monkey (69). In humans, PET studies have revealed that this area is involved specifically in food motivation (70), and that, like stressed monkeys, obese individuals also have decreased D₂ receptor function in this same reward area of the brain, varying inversely with body mass index (71).

Third, data suggest that enhanced physiologic reactivity to acute stress is clinically important, linked to subclinical atherosclerosis (72,73) and interacting with known psychosocial risk factors to produce greater degrees of subclinical atherosclerosis (41). Clinical observations suggest that chronic stress, per se, may be an important cause for such enhanced physiologic reactivity (as exemplified in Fig. 7). For instance, depressed (57), hostile (74), and low-SES subjects (19) all manifest exaggerated physiologic responses to acute stressors. These observations are complemented by experimental animal studies that indicate that repeated exposure to a chronic stressor results in increased adrenal and pressor responses to acute novel stressors (66,75). Other animal research indicates that the mimicking of chronic stress by experimentally elevating glucocorticoids within the brain produces enhanced adrenocorticotropic hormone responses (76) and increases in both baseline arterial blood pressure (77) and blood pressure and heart rate responses to an acute novel stressor (78). Research that further elucidates the neurophysiology of the chronic stress circuitry, and the mechanisms of neuroplasticity that produce long-term stress-induced changes in the control of physiologic functions, could pave the way for understanding and mitigating the adverse effects of chronic stress in cardiovascular disease.

	Factors linking psychosocial risk factors and cardiac practice

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As illustrated in Figure 8, there are important reasons that cardiologists should be interested and skilled in recognizing and managing psychosocial risk factors in practice. We have already discussed two compelling reasons: psychosocial risk factors are strongly linked to the development of adverse cardiac events and cluster with adverse behaviors that promote CAD. We now discuss four additional factors that link psychosocial risk factors to cardiac practice.

View larger version (39K): [in this window] [in a new window]   Figure 8 Six reasons that promote interest in the evaluation and management of psychosocial stress in cardiac practice.

Second, psychologic distress commonly presents as symptoms of cardiac disease in clinical practice. Notably, whereas certain psychosocial risk factors such as depression and anxiety can present with either psychologic and/or somatic manifestations, it is those with primarily somatic symptoms, such as chest pain or palpitations, who seek medical evaluation preferentially, thus exacerbating this tendency. In fact, estimates indicate that more than three-fourths of patients with major depression or panic disorder seen in primary care settings present with somatic complaints only (80,81). Because chest pain and palpitations are common somatic complaints, a high proportion of patients presenting with such symptoms in medical settings have psychologic distress in the absence of objective evidence of organic heart disease. For instance, whereas panic disorder occurs in <4% of the general population (79), it occurs in more than 15% to 20% of patients presenting with chest pain complaints in emergency departments, reflecting the high rate of medical care use by these patients (82). Physician awareness of these relationships is important, because psychologic distress is frequently underdiagnosed in medical evaluations of cardiac symptoms. For example, in a prospective evaluation of 441 patients presenting to a cardiac care emergency department with chest pain and evaluated blindly for psychiatric diagnosis, approximately 25% had panic disorder, but in 98% of the patients with panic disorder, the diagnosis was missed by the cardiologists in the cardiac care emergency department (83).

Third, psychosocial risk factors can adversely affect treatment adherence. For instance, a meta-analysis has demonstrated that patients with depression were three times more likely to be nonadherent with treatment recommendations (84). Similarly, a recent meta-analysis of 122 social support studies (85) has revealed that patient adherence is strongly influenced by the magnitude of adequate functional or structural social support. However, although it seems intuitively reasonable, it has not yet been conclusively demonstrated that alleviation of psychologic distress improves treatment adherence.

Fourth, acute psychologic stress shapes the course of cardiac disease in both positive and negative fashion. On the one hand, acute emotional stress represents an important trigger for exacerbating pathophysiologic processes, ranging from the induction of endothelial dysfunction to the precipitation of myocardial ischemia. The latter occurs during laboratory mental stress in approximately 50% of patients with exercise-induced ischemia (1). On the other hand, patients' experience of acute cardiac events and premonitory symptoms, such as angina pectoris, is itself a form of acute psychologic stress that can sometimes transform patients' lives by signaling a need for personal reflection, inducing a reevaluation of values and/or shifting the perspective of time from "years since birth" to "years remaining" (86). Such events may cause patients to be more receptive to adopting new attitudes and be more successful in altering unhealthy behaviors, as indicated by various studies. Because cardiologists commonly treat patients who experience acute life-threatening events and who may be more receptive to physician advice, cardiologists may be ideally positioned to initiate these interventions.

	Identification and management of psychosocial risk factors

Top Abstract Epidemiology Pathophysiology Factors linking psychosocial... Identification and management of... The emerging field of... References

 
Given that psychologic distress is often first detected in clinical health care settings, the cardiologist can play a critical role in the identification and management of psychosocial risk factors. This role can be divided into three broad categories: screening for psychosocial risk factors, referring of appropriate patients to behavioral health care providers, and managing milder forms of psychologic distress in the context of clinical practice.

Screening for psychosocial risk factors.   Cardiologists can increase the detection of psychosocial risk factors by systematically screening for them. Querying patients about psychosocial risk factors conveys the message that these factors are important and relevant to providing optimal care. Screening can be accomplished by structured interviews and/or by validated questionnaires. Although questionnaire measures are easily administered and objectively scored, interviews allow greater flexibility and offer richer clinical information than that provided by written inventories. Because cardiologists are accustomed to obtaining medical histories through a brief review of systems, additional questions about psychosocial risk factors could easily be incorporated into such assessment. These questions should cover three kinds of experiences that may help to identify psychologic distress: 1) emotional factors, such as depression, anxiety, and anger; 2) chronic stressors, such as work strain and home stress; and 3) somatic complaints that may be stress-related, such as fatigue and disrupted sleep. Some questions for screening patients' psychosocial status are suggested in Table 1.

Referring patients to behavioral health care providers..   The benefits of screening for psychosocial risk factors will be realized only if proper identification leads to appropriate intervention and follow-up. Patients with apparently significant psychologic distress or behavioral maladjustment should be referred to appropriate specialists for counseling and/or psychiatric treatment (87). Thus, part of the cardiologist's role in managing psychologic distress may be the development of a referral network of specialists. However, close follow-up of patients even after referral is highly advisable because early dropout from both pharmacotherapy and psychotherapy is common (87).

Managing psychologic distress in clinical practice.   Subclinical presentations of psychologic distress, such as minor depression, work stress, inability to relax, and difficulty sleeping, may be appropriately handled in routine cardiac practice. Tools that are readily available to cardiologists for direct management of psychosocial risk factors are practical behavioral interventions, as outlined in Table 2. Cardiologists are familiar with some of these interventions, such as exercise and nutritional counseling, but physicians may underestimate the potential effectiveness of such counseling techniques (88) and the other tools listed in Table 2.

Results of behavior and psychopharmacologic intervention trials.   A variety of behavioral and psychosocial interventions have been implemented in cardiac patients, including exercise training, psychosocial interventions as part of multifactorial risk factor modification, organized psychosocial interventions designed to reduce psychosocial risk factors, and psychopharmacotherapy. The results of cardiac outcome studies involving these approaches are reviewed here.

Exercise is commonly recommended by cardiologists to promote both primary and secondary CAD prevention, but evidence suggests that exercise may also modify psychosocial risk factors, including depression. For instance, cross-sectional studies of both medical populations and healthy cohorts have consistently demonstrated lower depression scores among those who are most active. The ability of exercise to reduce depression also has been demonstrated in randomized controlled trials, although many of these studies have had methodologic limitations (90). More recently, a randomized controlled comparison between antidepressant medication versus exercise was performed in a group of 156 men and women with depression (91). After 16 weeks, exercise was just as effective as sertraline hydrochloride in reducing depressive symptoms. Follow-up of these patients after six months revealed a low rate of relapse in the exercise group (92). Although the study may have had some methodologic limitations, these intriguing data suggest the need for additional prospective trials.

The utility of organized psychosocial interventions has been most commonly assessed by evaluating their incremental impact upon prognosis among patients referred to formal cardiac rehabilitation programs. For instance, Linden et al. (93) performed a meta-analysis of 23 randomized controlled trials that evaluated the impact associated with adding psychosocial interventions to standard cardiac rehabilitation regimens. During the first two years of follow-up, lack of psychosocial intervention was associated with greater rates for mortality and recurrent infarction. In a separate meta-analysis of psychosocial interventions and cardiac rehabilitation, Dusseldorp et al. (94) observed differential effects depending on the efficacy of the psychosocial intervention. When psychologic distress was reduced, the odds ratio for mortality and recurrent MI also was reduced, but when no reduction in psychologic stress occurred, mortality was higher in intervention than in control rehabilitation patients. Along these lines, recent data suggest that the failure to respond to psychosocial interventions may identify a subgroup of patients who are particularly susceptible to adverse clinical events (95).

The utility of stand-alone psychosocial interventions has also been evaluated in five large-scale behavioral intervention trials in cardiac patients, with mixed results. The Recurrent Coronary Prevention Project Study was a group therapy behavior modification program that succeeded in decreasing both Type A behavior and negative affect and also reduced the rates of cardiovascular mortality and nonfatal MI (96). The Ischemic Heart Disease study was a second successful intervention trial, using a unique home-based stress-reduction program to reduce cardiac events (97). Two other large trials did not reduce subsequent cardiac events in the treatment groups, but neither intervention successfully reduced psychosocial distress (98,99). In fact, one of these trials was a follow-up of the approach used in the Ischemic Heart Disease trial, and secondary analysis of the data from this trial revealed that the results could be attributed to inadequate psychologic intervention in the experimental group (100). Indeed, cardiac mortality was significantly reduced at one year among the subgroup of experimental treatment patients who experienced an early reduction in psychologic distress. The Enhancing Recovery in Coronary Heart Disease Patients (ENRICHD) study was the fifth and largest stand-alone psychosocial intervention trial to date. It evaluated the effect of psychologic treatment on the composite end point of all-cause mortality and nonfatal MI in post-MI patients who were either depressed and/or who reported low perceived social support (101). Patients were randomized within four weeks of the index MI, and treatment consisted of individual cognitive therapy and, when possible, group therapy supplemented by the use of a selective serotonin reuptake inhibitor (SSRI) for severe or unremitting depression. Primary analyses found no treatment differences in event-free survival (101). However, analyses suggested only a modest difference in psychosocial functioning between the treatment and control groups. Psychosocial functioning was better than anticipated in the control group, perhaps due to aggressive treatment as part of routine medical care, including participation in cardiac rehabilitation and psychologic therapies, thereby reducing treatment group differences.

The paucity of stand-alone behavioral intervention trials is partly due to the large sample sizes, long follow-up, and high costs required of such trials. One way to reduce this problem would be to use a three-stage approach for developing future interventions (Fig. 9) based on initial evaluations of surrogate end points, such as measures of subclinical atherosclerosis, myocardial ischemia, or flow-mediated dilation in smaller samples. Although there are limitations to the use of surrogate end points, they can be effective for developing new and innovative interventions for CAD before launching large multicenter randomized trials.

View larger version (43K): [in this window] [in a new window]   Figure 9 Proposed three-stage approach for developing behavioral intervention trials. Stage 1 consists of a single-center evaluation of a specific behavioral intervention. If successful, this intervention would be repeated at multiple centers to assess the reproducibility of findings (stage 2). In both stages, intermediate end points, such as change in carotid intimal wall thickening or plaque size during carotid ultrasonography, would be used to minimize necessary sample size and follow-up time. If reproducible results are obtained during stage 2, a multicenter intervention trial would be performed in stage 3, during which subjects would be observed for the occurrence of hard cardiac events. IMT = intima medial thickness.

Future directions in behavioral interventions.   Although clinical practice guidelines advocate psychosocial interventions in the context of cardiac rehabilitation programs, there are no existing recommendations to guide the delivery of psychosocial interventions in cardiac practice. Cardiac rehabilitation programs are widely recognized as effective in providing multifactorial multidisciplinary treatment for cardiac patients (106), but these programs are geographically limited and third-party reimbursement policies may limit patient participation. Overall, only 10% to 20% of eligible cardiac patients are referred to cardiac rehabilitation programs (106). Thus, these programs represent an incomplete delivery system for behavioral health care in cardiac practice. Moreover, because of time constraints and lack of formal training in behavioral techniques, many cardiologists may find it difficult to provide psychosocial interventions to their patients. In addition, even though cardiologists commonly manage behavioral risk factors, such as physical inactivity, poor diets, and smoking, lack of patient adherence to their behavioral recommendations remains an important problem (89) for which there is no easy solution. For all these reasons, development of effective models for the provision of psychologic and behavior services for cardiologists is needed.

Accordingly, programs of various complexities have been examined for their ability to improve physician management of behavioral risk factors. These programs include providing brief targeted physician training, monitoring patients by telephone follow-ups, using nurse managers in cardiology practice, and involving patients' primary care physicians in collaboration with mental health professionals such as psychologists and psychiatrists. This latter approach has shown promise for optimizing primary care physician management of serious psychologic illnesses such as depression (107) and panic disorder (108). Although critical assessment of these approaches is beyond the scope of our review, a conceptual approach for organizing behavioral health care interventions for cardiac patients, based on the collective experience garnered from these approaches, is shown in Figure 10. In this approach, guidelines would be developed for stepped collaborative care interventions, based on the complexity of patients' psychosocial and behavioral problems and their ability to adhere to behavioral recommendations.

View larger version (21K): [in this window] [in a new window]   Figure 10 Stepped collaborative care for cardiac patients depending on the degree of psychological distress. Patients with mild psychologic distress (step 1) would generally be treated by cardiologists without additional collaborative intervention. The greater the degree of psychosocial distress, the greater the need for collaborative intervention.

View larger version (33K): [in this window] [in a new window]   Figure 11 Approaches to promoting treatment adherence commonly make use of techniques that involve external regulation, such as the use of incentives or external network support. An alternative motivational paradigm to such controlled behavior regulation focuses on attempts to promote autonomy by fostering greater intrinsic motivation. Health providers can foster this motivational process through a variety of steps, including promoting patient ownership over recommended behavioral changes (i.e., getting patients to voice their own reasons for initiating change), helping patients to find a meaningful purpose for suggested changes, formatting the specifics of behavior recommendations in a manner most consistent with patients' personal preferences, and recognizing what coping mechanisms were best served by the old adverse behaviors (e.g., eating to decrease a sense of tension) and finding alternative solutions. At the same time it is important to avoid ignoring a sense of conflict (which can occur if behavioral recommendations are made without considering the relationship of physician advice to patients' internal values and preferences), fostering a sense of coercion, or setting goals that are not readily achievable.

	The emerging field of behavioral cardiology

Top Abstract Epidemiology Pathophysiology Factors linking psychosocial... Identification and management of... The emerging field of... References

	Acknowledgments

 
We thank Elliot Brown, Tara Hannon, Elizabeth Mostofsky, Nina Rieckmann, Deborah A. Scheuer, and Kimberlee Trudeau for their assistance and/or comments on prior drafts. We also thank Mindy Weingarten for her secretarial assistance.

	References

Top Abstract Epidemiology Pathophysiology Factors linking psychosocial... Identification and management of... The emerging field of... References

 
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