Hostility is associated with increased platelet activation in coronary heart disease

Stress-Induced Hypercoagulability: Insights from Epidemiological and Mechanistic Studies, and Clinical Integration

By integrating findings from comprehensive reviews, meta-analyses, and cutting-edge genetic studies, this article illuminates the significance of stress-induced hypercoagulability in clinical medicine. In particular, the findings from numerous prospective cohort studies indicate that stress and hemostatic factors of a hypercoagulable state are associated with increased incident risk and poor prognosis for atherosclerotic cardiovascular disease and venous thromboembolism. Mendelian randomization studies suggest that these associations are partially causal. The review synthesizes extensive research on the link between acute and chronic stress and hypercoagulability, outlining a potential pathway from stress to thrombosis risk. Consistent with the allostatic load concept, acute stress-induced hypercoagulability, initially adaptive, can turn maladaptive under chronic stress or excessive acute stress, leading to arterial or venous thrombotic events. Individuals with predisposing factors, including atherosclerosis, thrombophilia, or immobilization, may exhibit an increased risk of thrombotic disease during stress. Contextual sociodemographic characteristics, the stress experience, and coping resources additionally modulate the extent of stress-induced hypercoagulability. Research into the neuroendocrine, cellular, and molecular bases reveals how stress influences platelet activation coagulation and fibrinolysis. The activation of the sympathetic nervous system and the hypothalamic-pituitary-adrenal axis, along with vagal withdrawal, and the effects of catecholamines, cortisol, and vasopressin, are the central mechanisms involved. Hemoconcentration, inflammation, endothelial dysfunction, and thrombopoiesis additionally contribute to stress-induced hypercoagulability. Further research is needed to prove a causal link between chronic stress and hypercoagulability. This includes exploring its implications for the prevention and management of thrombotic diseases in stressed individuals, with a focus on developing effective psychosocial and pharmacological interventions.

Physical Aggression and Coronary Artery Calcification: A North Texas Healthy Heart Study

BACKGROUND

The purpose of this study was to determine the association between aspects of hostility and coronary artery calcification (CAC) scores. Specifically, analyses differentiated between subtypes of hostility and their relation to CAC.

METHODS

A sample of 571 patients aged 45 or older with no history of cardiovascular disease completed assessments of demographic, psychosocial, and medical history, along with a radiological CAC determination. Logistic regression was used to determine the association between hostility and CAC. Hostility was measured using the Aggression Questionnaire, which measured total aggression and how aggression is manifested on four scales: Physical, Verbal, Anger, and Hostility Aggression.

RESULTS

Regression analyses indicated that only the physical aggression parameter was related to CAC: a 5% increase in odds of CAC presence was indicated for every point increase in physical aggression. The association remained significant in adjusted analyses. Other factors associated with CAC in adjusted analyses included: age, gender, race/ethnicity, BMI, and dyslipidemia.

CONCLUSIONS

Psychosocial factors, such as physical aggression, are emerging factors that need to be considered in cardiovascular risk stratification.

Impact of Acute and Chronic Stress on Thrombosis in Healthy Individuals and Cardiovascular Disease Patients

Psychological stress induces different alterations in the organism in order to maintain homeostasis, including changes in hematopoiesis and hemostasis. In particular, stress-induced hyper activation of the autonomic nervous system and hypothalamic–pituitary–adrenal axis can trigger cellular and molecular alterations in platelets, coagulation factors, endothelial function, redox balance, and sterile inflammatory response. For this reason, mental stress is reported to enhance the risk of cardiovascular disease (CVD). However, contrasting results are often found in the literature considering differences in the response to acute or chronic stress and the health condition of the population analyzed. Since thrombosis is the most common underlying pathology of CVDs, the comprehension of the mechanisms at the basis of the association between stress and this pathology is highly valuable. The aim of this work is to give a comprehensive review of the studies focused on the role of acute and chronic stress in both healthy individuals and CVD patients, focusing on the cellular and molecular mechanisms underlying the relationship between stress and thrombosis.

Anger, hostility and risk of stroke: a meta-analysis of cohort studies

OBJECTIVE

A growing number of studies have been conducted on the relationship between anger and hostility and the risk of stroke, and their conclusions are not consistent. Accordingly, we performed a meta-analysis to evaluate the relationship between anger and hostility and the risk of stroke.

METHODS

We searched the PubMed and Embase databases for cohort studies, focusing on the relationship between anger and hostility and risk of stroke. Then studies were selected according to the inclusion and exclusion criteria. Study results were pooled using a random effects model.

RESULTS

Ten studies from seven articles involving 52,277 participants were included in this meta-analysis. No significant association was found between anger and hostility level and risk of stroke (hazard ratio 1.08; 95% confidence interval 0.79-1.47). However, a positive association was seen when people with high socioeconomic status were excluded (hazard ratio 1.30; 95% confidence interval 1.06-1.59).

CONCLUSION

A higher level of anger and hostility is not associated with elevated risk of stroke. However, the association is positive among people with lower socioeconomic status.

Anger and Coronary Artery Disease in Women Submitted to Coronary Angiography: A 48-Month Follow-Up

Background

Anger control was significantly lower in patients with coronary artery disease (CAD), regardless of traditionally known risk factors, occurrence of prior events or other anger aspects in a previous study of our research group.

Objective

To assess the association between anger and CAD, its clinical course and predictors of low anger control in women submitted to coronary angiography.

Methods

This is a cohort prospective study. Anger was assessed by use of Spielberger’s State-Trait Anger Expression Inventory (STAXI). Women were consecutively scheduled to undergo coronary angiography, considering CAD definition as ≥ 50% stenosis of one epicardial coronary artery.

Results

During the study, 255 women were included, being divided into two groups according to their anger control average (26.99). Those with anger control below average were younger and had a family history of CAD. Patients were followed up for 48 months to verify the occurrence of major cardiovascular events.

Conclusion

Women with CAD undergoing coronary angiography had lower anger control, which was associated with age and CAD family history. On clinical follow-up, event-free survival did not significantly differ between patients with anger control above or below average.

Sound mind vs sound heart

Depressive and anxiety disorders have both have been associated with an increased risk of cardiovascular disease. This article highlights the multifactorial and bidirectional interaction between cardiovascular diseases, depression and anxiety, and the need for early assessment, diagnosis and intervention.

Anger proneness, gender, and the risk of heart failure

BACKGROUND

Evidence regarding the association of anger proneness with incidence of heart failure is lacking.

METHODS AND RESULTS

Anger proneness was ascertained among 13,171 black and white participants of the Atherosclerosis Risk in Communities (ARIC) study cohort with the use of the Spielberger Trait Anger Scale. Incident heart failure events, defined as occurrence of ICD-9-CM code 428.x, were ascertained from participants' medical records during follow-up in the years 1990-2010. Relative hazard of heart failure across categories of trait anger was estimated with the use of Cox proportional hazard models. Study participants (mean age 56.9 [SD 5.7] years) experienced 1,985 incident HF events during 18.5 (SD 4.9) years of follow-up. Incidence of HF was greater among those with high, as compared to those with low or moderate trait anger, with higher incidence observed for men than for women. The relative hazard of incident HF was modestly high among those with high trait anger, compared with those with low or moderate trait anger (age-adjusted hazard ratio for men: 1.44 (95% confidence interval [CI] 1.23-1.69). Adjustment for comorbidities and depressive symptoms attenuated the estimated age-adjusted relative hazard in men to 1.26 (95% CI 1.00-1.60).

CONCLUSIONS

Assessment of anger proneness may be necessary in successful prevention and clinical management of heart failure, especially in men.

Adaptation and implementation of an evidence-based behavioral medicine program in diverse global settings: The Williams LifeSkills experience

Epidemiological research has documented the health-damaging effects of psychosocial factors like hostility, depression, anxiety, job stress, social isolation and low socioeconomic status. Several studies suggest that behavioral interventions can reduce levels of these psychosocial factors. Herein we describe the translational process whereby the Williams LifeSkills® (WLS(®)) program and products for reducing psychosocial risk factors have been developed and tested in clinical trials in the U.S. and Canada and then adapted for other cultures and tested in clinical trials in other countries around the world. Evidence from published controlled and observational trials of WLS(®) products in the U.S. and elsewhere shows that persons receiving coping skills training using WLS(®) products have consistently reported reduced levels of psychosocial risk factors. In two controlled trials, one for caregivers of a relative with Alzheimer's Disease in the U.S. and one for coronary bypass surgery patients in Singapore, WLS(®) training also produced clinically significant blood pressure reductions. In conclusion, WLS(®) products have been shown in controlled and observational trials to produce reduced levels of both psychosocial and cardiovascular stress indices. Ongoing research has the potential to show that WLS(®) products can be an effective vehicle for the delivery of stress reduction and mental health services in developing countries.

A comparison of cook-medley hostility subscales and mortality in patients with coronary heart disease: data from the heart and soul study

OBJECTIVE

Hostility is associated with adverse outcomes in patients with coronary heart disease (CHD). However, assessment tools used to evaluate hostility in epidemiological studies vary widely.

METHODS

We administered nine subscales of the Cook-Medley Hostility Scale (CMHS) to 656 outpatients with stable CHD between 2005 and 2007. We used Cox proportional hazards models to determine the association between each hostility subscales and all-cause mortality. We also performed an item analysis using logistic regression to determine the association between each CMHS item and all-cause mortality.

RESULTS

There were 136 deaths during 1364 person-years of follow-up. Four of nine CMHS subscales were predictive of mortality in age-adjusted analyses, but only one subscale (the seven-item Williams subscale) was predictive of mortality in multivariable analyses. After adjustment for age, sex, education, smoking, history of heart failure, diabetes, and high-density lipoprotein, each standard deviation increase in the Williams subscale was associated with a 20% increased mortality rate (hazard ratio = 1.20, 95% confidence interval = 1.00-1.43, p = .046), and participants with hostility scores in the highest quartile were twice as likely to die as those in the lowest quartile (hazard ratio = 2.00, 95% confidence interval = 1.10-3.65, p = .023).

CONCLUSIONS

Among nine variations of the CMHS that we evaluated, a seven-item version of the Williams subscale was the most strongly associated with mortality. Standardizing the assessment of hostility in future epidemiological studies may improve our understanding of the relationship between hostility and mortality in patients with CHD.

Hostility, health behaviors, and risk of recurrent events in patients with stable coronary heart disease: findings from the Heart and Soul Study

BACKGROUND

Hostility is a significant predictor of mortality and cardiovascular events in patients with coronary heart disease (CHD), but the mechanisms that explain this association are not well understood. The purpose of this study was to evaluate potential mechanisms of association between hostility and adverse cardiovascular outcomes.

METHODS AND RESULTS

We prospectively examined the association between self-reported hostility and secondary events (myocardial infarction, heart failure, stroke, transient ischemic attack, and death) in 1022 outpatients with stable CHD from the Heart and Soul Study. Baseline hostility was assessed using the 8-item Cynical Distrust scale. Cox proportional hazard models were used to determine the extent to which candidate biological and behavioral mediators changed the strength of association between hostility and secondary events. During an average follow-up time of 7.4 ± 2.7 years, the age-adjusted annual rate of secondary events was 9.5% among subjects in the highest quartile of hostility and 5.7% among subjects in the lowest quartile (age-adjusted hazard ratio [HR]: 1.68, 95% confidence interval [CI]: 1.30 to 2.17; P < 0.0001). After adjustment for cardiovascular risk factors, participants with hostility scores in the highest quartile had a 58% greater risk of secondary events than those in the lowest quartile (HR: 1.58, 95% CI: 1.19 to 2.09; P = 0.001). This association was mildly attenuated after adjustment for C-reactive protein (HR: 1.41, 95% CI, 1.06 to 1.87; P = 0.02) and no longer significant after further adjustment for smoking and physical inactivity (HR: 1.25, 95% CI: 0.94 to 1.67; P = 0.13).

CONCLUSIONS

Hostility was a significant predictor of secondary events in this sample of outpatients with baseline stable CHD. Much of this association was moderated by poor health behaviors, specifically physical inactivity and smoking.

Influence of mental stress on platelet bioactivity

It is well established that various mental stress conditions contribute, or at least influence, underlying pathophysiological mechanisms in somatic, as well as in psychiatric disorders; blood platelets are supposed to represent a possible link in this respect. The anculeated platelets are the smallest corpuscular elements circulating in the human blood. They display different serotonergic markers which seem to reflect the central nervous serotonin metabolism. They are known as main effectors in haematological processes but recent research highlights their role in the innate and adaptive immune system. Platelets are containing a multitude of pro-inflammatory and immune-modulatory bioactive compounds in their granules and are expressing immune-competent surface markers. Research gives hint that platelets activation and reactivity is increased by mental stress. This leads to enhanced cross talk with the immune system via paracrine secretion, receptor interaction and formation of platelet leucocyte-aggregates. Recently it has been demonstrated that the immune system can have a remarkable impact in the development of psychiatric disorders. Therefore platelets represent an interesting research area in psychiatry and their role as a possible biomarker has been investigated. We review the influence of mental stress on what is termed platelet bioactivity in this article, which subsumes the mainly immune-modulatory activity of platelets in healthy volunteers, elderly persons with chronic care-giving strain, patients with cardiovascular diseases who are prone to psychosocial stress, as well as in patients with posttraumatic stress disorder. Research data suggest that stress enhances platelet activity, reactivity and immune-modulatory capacities.

Responses of mental stress-induced myocardial ischemia to escitalopram treatment: background, design, and method for the Responses of Mental Stress Induced Myocardial Ischemia to Escitalopram Treatment trial

BACKGROUND

Mental stress-induced myocardial ischemia (MSIMI) is common in patients with clinically stable coronary heart disease (CHD) and is associated with poor outcomes. Depression is a risk factor of MSIMI. The REMIT trial investigates whether selective serotonin reuptake inhibitor (SSRI) treatment can improve MSIMI. The rationale and outline of the study are described.

METHOD

In this single-center randomized clinical trial, adult patients with clinically stable CHD are recruited for baseline mental and exercise stress testing assessed by echocardiography. In addition, psychometric questionnaires are administered, and blood samples are collected for platelet activity analysis. Patients who demonstrate MSIMI, defined by new abnormal wall motion, ejection fraction reduction ≥8%, and/or development of ischemic ST change in electrocardiogram during mental stress testing, are randomized at a 1:1 ratio to escitalopram or placebo for 6 weeks. Approximately 120 patients with MSIMI are enrolled in the trial. The stress testing, platelet activity assessment, and psychometric questionnaires are repeated at the end of the 6-week intervention. The hypothesis of the study is that SSRI treatment improves MSIMI via mood regulation and modification of platelet activity.

CONCLUSION

The REMIT study examines the effect of SSRI on MSIMI in vulnerable patients with CHD and probes some potential underlying mechanisms.

Psychological risk factors and cardiovascular disease: is it all in your head?

Psychological stress has been shown to be associated with cardiovascular disease. Over the past few decades, there has been an increasing interest in this relationship, leading to a growing pool of clinical and epidemiological data on the subject. Psychological stress has multiple etiologies, which include behavioral causes, acute events or stressors, and/or chronic stress. Cardiac rehabilitation and exercise therapy have been shown to provide protection in primary and secondary coronary heart disease prevention, as well as improve overall morbidity and mortality. In this article, we review the available data regarding the association between psychological stress and cardiovascular disease, as well as the impact of cardiac rehabilitation and exercise therapy on psychological stress-related cardiovascular events.

Hair cortisol and the risk for acute myocardial infarction in adult men

Acute stress is increasingly recognized as a precipitant of acute myocardial infarction (AMI). However, the role of chronic stress in developing AMI is less clear. We have developed a method to measure cortisol in hair, which allows longitudinal assessment of cortisol levels prior to an acute event. We aimed to evaluate the hypothesis that chronic stress, as assessed by hair cortisol content, is associated with the development of AMI. A prospective case-control study included 56 patients admitted to hospital with AMI and 56 control patients, admitted to internal medicine wards for other indications. An enzyme immunoassay technique was used to measure cortisol in the most proximal 3 cm of hair, considered to represent the most recent 3 months of exposure. Median hair cortisol contents (range) were 295.3 (105.4-809.3)ng/g in AMI patients and 224.9 (76.58-949.9)ng/g in controls (p = 0.006, Mann-Whitney U-test). After controlling for other risk factors for AMI using multiple logistic regression, log-transformed hair cortisol content remained the strongest predictor (OR 17.4, 95% CI 2.15-140.5; p = 0.007). We demonstrated elevated hair cortisol concentrations in patients with AMI. This suggests that chronic stress, as assessed by increased hair cortisol in the 3 months prior to the event, may be a contributing factor for AMI.

Central nervous system serotonin and clustering of hostility, psychosocial, metabolic, and cardiovascular endophenotypes in men

OBJECTIVE

To use measures of cerebrospinal fluid (CSF) 5-hydroxyindoleacetic acid (5HIAA) and genotype of a functional polymorphism of the monoamine oxidase A gene promoter (MAOA-uVNTR) to study the role of central nervous system (CNS) serotonin in clustering of hostility, other psychosocial, metabolic and cardiovascular endophenotypes.

METHODS

In 86 healthy male volunteers, we evaluated CSF levels of the primary serotonin metabolite 5HIAA and MAOA-uVNTR genotype for association with a panel of 29 variables assessing hostility, other psychosocial, metabolic, and cardiovascular endophenotypes.

RESULTS

The correlations of 5HIAA with these endophenotypes in men with more active MAOA-uVNTR alleles were significantly different from those of men with less active alleles for 15 of the 29 endophenotypes. MAOA-uVNTR genotype and CSF 5HIAA interacted to explain 20% and 22% of the variance, respectively, in scores on one factor wherein high scores reflected a less healthy psychosocial profile and a second factor wherein high score reflected increased insulin resistance, body mass index, blood pressure and hostility. In men with less active alleles, higher 5HIAA was associated with more favorable profiles of hostility, other psychosocial, metabolic and cardiovascular endophenotypes; in men with more active alleles, higher 5HIAA was associated with less favorable profiles.

CONCLUSIONS

These findings indicate that, in men, indices of CNS serotonin function influence the expression and clustering of hostility, other psychosocial, metabolic and cardiovascular endophenotypes that have been shown to increase risk of developing cardiovascular disease. The findings are consistent with the hypothesis that increased CNS serotonin is associated with a more favorable psychosocial/metabolic/cardiovascular profile, whereas decreased CNS serotonin function is associated with a less favorable profile.

Depression and related psychological factors in heart disease

In this article we review the role of depression and other related psychological factors in heart disease. The prevalence of heart disease in patients with depression is high, and epidemiological links between depression and heart disease are evident in studies of community samples, psychiatric patients, and heart disease patients. We also describe the links between heart disease and related psychological factors-including vital exhaustion, Type A behavior pattern, anger and hostility, and Type D personality-and summarize proposed mechanisms that may link negative affects with heart disease. Finally, we review treatment of depression in heart disease, including evidence from several large clinical trials.

Hostility and platelet reactivity in individuals without a history of cardiovascular disease events

OBJECTIVE

To examine the association between hostility and platelet reactivity in individuals without a prior history of cardiovascular disease (CVD) events. Hostility is associated with incident CVD events, independent of traditional risk factors. Increased platelet reactivity and thrombus formation over a disrupted coronary plaque are fundamental for CVD event onset.

METHODS

Hypertensive patients (n = 42) without concomitant CVD event history completed the 50-item Cook-Medley Hostility Scale, and a subset score of 27 items (Barefoot Ho) was derived. We examined the relationship between Barefoot Ho scores and platelet aggregation. We also examined individual components of Barefoot Ho (aggressive responding, cynicism, and hostile affect) and their associations with platelet aggregation. Platelet reactivity, induced by adenosine diphosphate (ADP), was assessed by standard light transmission aggregometry, the current gold standard method of platelet aggregation assessment.

RESULTS

Barefoot Ho scores were related significantly to increased rate of platelet aggregation in response to ADP. Of the three Barefoot Ho components, only aggressive responding was associated independently with increased platelet aggregation rate. The strength of these relationships did not diminish after adjusting for several standard CVD risk factors.

CONCLUSIONS

These data demonstrate that hostility, particularly the aggressive responding subtype, is associated with platelet reactivity-a key pathophysiological pathway in the onset of CVD events.

Psychosocial and biobehavioral factors and their interplay in coronary heart disease

Recent epidemiological research has confirmed that psychosocial factors are associated with increased risk of developing coronary heart disease (CHD), a major cause of death and disability worldwide. This association is probably mediated by changes in health risk behaviors and neuroendocrine and autonomic functions that affect metabolic, hemostatic, inflammatory, and cardiovascular functions that are the proximal agents in CHD pathogenesis over time as well as the precipitation of acute disease events. Recent developments in genomics have now made it possible to begin the process of identifying specific genetic variants that act either independently or via moderation of the impact of exposures to stressful environmental situations to increase the expression of these health-damaging psychosocial factors and the accompanying behavioral and physiological changes that lead to disease. It will be possible ultimately to use the knowledge emerging from research on gene x environment interactions that affect expression of psychosocial risk factors, health risk behaviors, and biological changes inside the body to speed the development of a new field of prospective medicine-a field where instead of spending the majority of health care resources on the treatment of chronic diseases at the end of life, it will be possible to allocate more resources to develop, test, and implement earlier in the disease process cost-effective, proactive interventions that target persons at high risk.

Cynical hostility and carotid atherosclerosis in African American and white women: the Study of Women's Health Across the Nation (SWAN) Heart Study

BACKGROUND

Hostility is associated with increased cardiovascular disease mortality and morbidity and may be related to subclinical atherosclerosis; less is known about this association among women and minority groups.

METHODS

We examined the association between hostility and intimal-medial thickening (IMT) as well as presence/absence of plaque in the carotid arteries in middle-aged white and African American women. Hostility was measured by a 13-item questionnaire and IMT and plaque were assessed by B-mode ultrasonography in 589 participants from the Chicago and Pittsburgh sites of the SWAN.

RESULTS

In age- and site-adjusted models, each 1-point increment in hostility score predicted a significant 0.0057-mm higher mean IMT (P < .0001) and 0.0081-mm higher maximum IMT (P < .0001)--effects that were identical in magnitude to each 1-year increment in age. Adjustments for race, education, body mass index, resting systolic blood pressure, and smoking diminished these associations, but they remained significant (P < or = .01). With hostility scores modeled in approximate tertiles, high scorers (> or = 6) had greater mean (P = .0005) and maximum (P = .0004) IMT than low scorers (0 or 1); moderate and low scorers did not differ (age-adjusted mean values for low, moderate, and high scorers were 0.657, 0.662, and 0.694 mm, respectively, for mean IMT; those for low, moderate, and high scorers were 0.855, 0.860, and 0.906 mm, respectively, for maximum IMT). Hostility was unrelated to presence of plaque and did not interact with race, education, smoking, and body mass index.

CONCLUSIONS

Hostility is related to small but significantly greater subclinical atherosclerosis in middle-aged women; this association is not explained by traditional risk factors.

Platelets, coronary heart disease, and stress

Coronary heart disease is the leading cause of death in Western society, and its development is associated with chronic stress and other psychosocial factors. Atherosclerosis, the disorder underlying this disease, is an inflammatory process in which leukocytes interact with structurally intact but dysfunctional endothelium of the arteries. Platelets play a key role in this process by binding to leukocytes and promoting their recruitment to the endothelium. Platelet-leukocyte interactions also stimulate the release of pro-inflammatory and pro-thrombotic factors which promote atherosclerosis. Elevated circulating levels of platelet-leukocyte aggregates have been reported in cardiac patients and in individuals of low socioeconomic status, a factor associated with chronic psychological stress. Increased platelet activation has also been observed in individuals prone to depression or hostility, and in people subject to high levels of work stress. Acute psychological stress increases circulating platelet-leukocyte aggregates in healthy individuals and this effect is prolonged in cardiac patients. Platelet activation may be a mechanism linking psychosocial stress with increased coronary risk, and may also play a role in the emotional triggering of acute coronary syndromes in patients with advanced coronary disease.

Life-time history of suicide attempts and coronary artery disease in a community-dwelling elderly population

BACKGROUND

Numerous studies have observed a strong relationship between coronary artery disease (CAD) and psychiatric disorder; notably depression, anxiety and panic attacks. No study has, however, explored the question of whether persons suffering from CAD might also be at high risk of suicide attempts.

OBJECTIVE

The aim of the present study is to examine the relationship between CAD within a general population cohort and life-time history of psychiatric disorder and suicidal behaviour.

METHOD

A representative sample of 1,843 non-institutionalized persons over 65, drawn at random from the electoral roll, was given a standardized neurological and psychiatric examination based on DSM-IV criteria. The clinical examination also included an electrocardiogram (ECG) and a questionnaire relating to life-time medical history. Cardiac events were validated by the general practitioner.

RESULTS

Within this general population sample the prevalence of suicide attempts was 3.9%. A significant positive association was observed between life-time prevalence of CAD and suicide attempts (p<0.04). Suicide attempts were associated with major depression (p<0.001) co-morbid anxiety and depression (p<0.001) but not anxiety alone (p=0.16). A logistic regression analysis showed that the relationship between suicide attempts and CAD persists after adjustment for depression and anxiety.

CONCLUSION

CAD is associated with suicidal behaviour independently of depression, however, longitudinal studies are required to clarify the direction of causality and to integrate genetic, biological, environmental and psychological factors into an aetiological model.

Prodromal symptoms in myocardial infarction

BACKGROUND

Little is known about the prodromal phase of myocardial infarction (MI). The aim of this study was to explore this phase with methodologies which have been standardized in affective disorders. The psychological evaluation of patients with MI diagnosis is currently based on DSM-IV criteria. An alternative diagnostic and conceptual framework has been proposed by an international group of psychosomatic investigators. In this study, we are going to compare these new criteria, i.e. the Diagnostic Criteria for Psychosomatic Research (DCPR), with DSM-IV in a population where a high prevalence of psychological problems is expected.

METHODS

A semistructured research interview based on Paykel's Clinical Interview for Depression for eliciting prodromal symptoms was administered to a consecutive series of 92 patients with a first episode MI diagnosis. Two interviews for the evaluation of psychological problems were administered according to DSM-IV and DCPR criteria.

RESULTS

Most of the patients reported prodromal symptoms. Irritability, depressed mood and somatic anxiety were the most common prodromal symptoms. The results also show that the number of DCPR diagnoses was higher than the number of DSM-IV diagnoses. At least one DCPR diagnosis was found in all patients, whereas at least one DSM-IV diagnosis was present in 42 (46%) patients.

CONCLUSIONS

The prodromal phase of MI was found to be characterized by prodromal symptoms of affective type. The joint use of DSM-IV and DCPR criteria was found to improve the identification of psychological factors which could affect this phase. The results should alert the physician to the fact that patients presenting with irritability, depressed mood (including demoralization), anxiety and insomnia may be at risk of developing coronary artery disease.

Hostility scores are associated with increased risk of cardiovascular events in women undergoing coronary angiography: a report from the NHLBI-Sponsored WISE Study

OBJECTIVE

To evaluate hostility-related personality traits assessed by the Cook Medley Hostility Inventory and to relate these to the occurrence of adverse cardiac events in women with suspected myocardial ischemia.

METHODS

The cohort included 506 women with suspected coronary artery disease from the National Heart, Lung, and Blood Institute-sponsored Women's Ischemia Syndrome Evaluation (WISE) study. We examined individual components of the Cook Medley Hostility Score (CMHS) measuring cynicism, hostile affect, and aggressive responding, and a total CMHS (sum of these three) and associations with adverse events (defined as hospitalization for angina, nonfatal myocardial infarction, stroke, congestive heart failure (CHF) other vascular events and death) during 3 to 6 years follow-up using Cox proportional hazard modeling.

RESULTS

Women with adverse events had higher total CMHS (10.6 +/- 5.5) than women without any of these events (9.2 +/- 5.1) p = .02. They also had poorer survival by Kaplan-Meier analysis (log-rank p < .05). Unadjusted Cox models showed that the individual scores of cynicism and aggressive responding and the total CMHS were associated with more adverse events (all p < .05). Women with total CMHS above the median had a 35% increase risk of an adverse event in comparison to women with lower scores. In a risk-adjusted Cox model, the hazard ratio for an adverse event was 1.5 (p = .03) for women with total CMHS above the median.

CONCLUSION

In this cohort of women with suspected myocardial ischemia, higher Cook Medley scores reflecting cynicism, hostile affect, and aggressive responding were associated with poorer 3 to 6 year event-free survival and a higher risk of adverse events. After adjusting for risk factors and CAD, the association with risk for adverse events increased.

Psychosocial factors and cardiovascular diseases

Rapidly accruing evidence from a diversity of disciplines supports the hypothesis that psychosocial factors are related to morbidity and mortality due to cardiovascular diseases. We review relevant literature on (a) negative emotional states, including depression, anger and hostility, and anxiety; (b) chronic and acute psychosocial stressors; and (c) social ties, social support, and social conflict. All three of these psychosocial domains have been significantly associated with increased risk of cardiovascular morbidity and mortality. We also discuss critical pathophysiological mechanisms and pathways that likely operate in a synergistic and integrative way to promote atherogenesis and related clinical manifestations. We conclude by discussing some of the important challenges and opportunities for future investigations.

Heart and mind: (1) relationship between cardiovascular and psychiatric conditions

The relationship of our emotions and psyche to heart disease is intriguing. In this article we have reviewed the evidence linking cardiovascular and neuropsychiatric disorders and the possible mechanisms and pathophysiology of this association. This review is derived from Medline searches (1966-2002) using the relevant search terms (psychiatric disease, cardiovascular disease, depression, anxiety, and pathophysiology). Finally, the possible role of using mood enhancing therapies (mainly antidepressants) and their safety in patients with cardiovascular disorders is briefly discussed. In a companion paper, the therapeutic aspects of these two conditions is highlighted.

Prevalence of hostility in young coronary artery disease patients and effects of cardiac rehabilitation and exercise training

OBJECTIVE

To determine the prevalence of hostility symptoms in young patients with coronary artery disease (CAD), the associated risk factor profile in these patients, and the effects of a formal phase 2 cardiac rehabilitation and exercise training program.

PATIENTS AND METHODS

Our study included consecutive CAD patients referred for cardiac rehabilitation from May 1999 through December 2000. At baseline and after rehabilitation, behavioral factors and quality of life were assessed by validated questionnaires, and standard CAD risk factors were measured, including exercise capacity. We specifically evaluated detailed data for young patients.

RESULTS

A total of 500 patients were included in the study. Hostility scores were 2.5 times higher (P<.001) in the 81 young patients (< 50 years; mean +/- SD age, 45 +/- 5 years) than in the 268 elderly patients (> or = 65 years; mean +/- SD age, 70 +/- 4 years), and the prevalence of hostility symptoms was 3.5 times higher in young patients (28% vs 8%; P<.001). Young patients with hostility symptoms also had more adverse CAD risk profiles, including higher total cholesterol levels, triglyceride levels, total cholesterol/high-density lipoprotein cholesterol ratios, fasting glucose levels, and glycosylated hemoglobin levels and lower quality-of-life scores compared with young patients with low hostility scores. After cardiac rehabilitation, young patients with hostility symptoms had marked improvements in CAD risk factors, behavioral characteristics (including hostility), and quality of life, and a nearly 50% (P=.005) reduction in the prevalence of hostility symptoms occurred.

CONCLUSIONS

Young CAD patients have a high prevalence of hostility symptoms and adverse CAD risk profiles. Reducing hostility symptoms and other parameters of psychological distress in young CAD patients should be emphasized, and the potential benefits of cardiac rehabilitation programs in the secondary prevention of CAD should be highlighted.

Should selective serotonin reuptake inhibitors be prescribed to all patients with ischemic heart disease?

Recent studies have uncovered more and more evidence demonstrating the adverse relationship between depression and ischemic heart disease. One of the most significant mechanisms that may explain the adverse relationship is the increased platelet activity, otherwise known as aggregation, observed to occur in patients with depression or ischemic heart disease. Platelet activity is further elevated in patients with depression and ischemic heart disease. Selective serotonin reuptake inhibitors are antidepressants and also act like platelet inhibitors. The results of large-scale clinical trials suggest that the use of selective serotonin reuptake inhibitors may reduce cardiac events in post-myocardial infarction patients or in those with unstable angina that may be related to the effects of selective serotonin reuptake inhibitors on platelet aggregation.

What's “Unstable” in Unstable Angina?

The role of emotional distress (e.g., anger, depression, and anxiety) in anginal chest discomfort (ACD) may have been underestimated. The authors review the empirical studies in this area, which are inconsistent with the standard theory on the ischemia-angina relationship; summarize the substantial evidence indicating a strong and consistent cross-sectional/prospective epidemiological association of emotional distress and ischemia/ACD; review the distress-targeted, interventional evidence confirming a causal relationship (i.e., reduced chest discomfort and health system utilization), thus confirming clinical utility of such interventions; and explore the possible mechanisms that might account for the relationship between emotional distress and chest discomfort. Substantial clinical benefit may be achieved by aggressively detecting and treating emotional distress in ACD patients.

Increased coronary events in depressed cardiovascular patients: 5-HT2A receptor as missing link?

OBJECTIVE

Major depressive disorder and depressive symptoms have been identified as independent risk factors for cardiac morbidity and mortality in patients with ischemic heart disease. Increased susceptibility to platelet activation has been proposed as one of the mechanisms by which depression acts as a significant risk factor for thrombotic events. In this review, data on platelet activation and platelet aggregation measures in depressed patients with or without concomitant cardiovascular disease are given. Data on the influence of antidepressants on parameters of platelet activation are summarized.

METHODS

A literature search was done by checking MEDLINE Advanced and PsycInfo from 1990 to 2003 and through checking the bibliographies of these sources. The following key words were used for this search: platelet activation, platelet aggregation, depression, depressive disorder, ischemic heart disease, calcium, and serotonin.

RESULTS

There is an indication of enhanced platelet activation and aggregation in depressed patients. Next, patients with a depressive disorder show signs of a hyperactive platelet 5-HT2A receptor signal transduction system as measured by increased platelet calcium mobilization after stimulation of platelets with serotonin.

CONCLUSIONS

Depression appears to be associated with an increased susceptibility for serotonin-mediated platelet activation. Upregulation and/or increased sensitivity of 5-HT2A/1B receptors and downregulated 5-HT transporter receptors in the periphery may contribute to increased risk of thromboembolic events in patients with depression and cardiovascular disease. Increased platelet reactivity based on a hyperreactive 5-HT2A receptor signaling system might be influenced by antidepressive medication that antagonizes platelet 5-HT2A receptors.

La hostilidad y su relación con los trastornos cardiovasculares

Uno de los campos más desarrollados en el ámbito de la Psicología de la Salud es el de los aspectos psicológicos que intervienen en la enfermedad cardíaca. Dentro de los constructos psicológicos más estudiados se encuentra el de la hostilidad. Inicialmente componente del patrón de conducta tipo A, se han ido desarrollando diferentes formas de referirla, y por consiguiente, de medirla. En este artículo se analizan algunas de las nociones más citadas sobre la hostilidad y otras manifestaciones asociadas, los modelos explicativos de su relación con los trastornos cardiovasculares - en especial el de la hiperreactividad cardiovascular - y los instrumentos que se desarrollaron para su evaluación. Por último, se discuten las actuales implicancias del uso del constructo, así como las áreas de investigación a desarrollar para delimitar mejor este factor que ha sido referido en forma diversa, y consiguientemente ha reportado en los diferentes estudios resultados no siempre consistentes entre sí.

Anger expression and risk of stroke and coronary heart disease among male health professionals

OBJECTIVE

Anger expression is a dimension of anger that may be strongly related to coronary heart disease and stroke. To date few cohort studies have evaluated the role of anger coping style in the development of cardiovascular disease. This study prospectively examined the effects of anger expression on incidence of cardiovascular disease.

METHODS

Participants were male health professionals (N = 23,522), aged 50 to 85 years old and without previous cardiovascular disease, who responded to a mailed questionnaire incorporating the Spielberger Anger-Out Expression Scale in 1996. The cohort was followed for 2 years (1996-1998).

RESULTS

Men with moderate levels of anger expression had a reduced risk of nonfatal myocardial infarction compared with those with lower levels of expression (relative risk: 0.56; 95% confidence interval: 0.32-0.97), controlling for coronary risk factors, health behaviors, use of psychotropic medication, employment status, and social integration. Anger expression was also inversely associated with risk of stroke. The multivariate relative risk of stroke was 0.42 (95% confidence interval: 0.20-0.88), comparing men with higher anger-out scores to men with lower scores. A protective dose-response relationship was observed between anger-out score and risk of stroke (p for multivariate trend test: 0.04).

CONCLUSIONS

Among this cohort of older men with high socioeconomic status and relatively low level of anger expression on average, moderate anger expression seemed to be protective against cardiovascular disease over a limited follow-up period.

Interactions of psychological factors and family history in relation to coronary artery disease

BACKGROUND

Psychological factors including hostility, depression and stress have been associated with severity of coronary artery disease (CAD). However, few studies have examined interactions between such factors and typical CAD risk factors. Investigating interactive effects simulates their co-occurrence and complex effects in illness, as well as helping to identify groups of patients at greatest risk of morbidity. This study examined the interactive effects of hostility, hopelessness and daily hassles with family history of CAD in relation to CAD severity.

DESIGN

Correlation design.

METHODS

Seventy-three patients were assessed for hostility, hopelessness and daily hassles before undergoing coronary artery angiography. Severity of CAD was assessed by a cardiologist who was blind to patients' psychological data, with a scale considering type and proximity of occluded artery: the Ilia-score.

RESULTS

Hostility significantly interacted with family history in relation to CAD severity. Hostility was positively correlated with CAD severity when family history was positive (r = 0.43, P< 0.05), but not when family history was absent (r = -0.10, NS). No other interaction effects were found. Interestingly, patients with family history of CAD had significantly lower hostility scores (14.4) compared to patients without such history (19.2; P= 0.002). No background or typical-risk factor correlated with CAD severity.

CONCLUSION

Hostility synergistically interacted with family history of CAD in relation to CAD severity. The mechanisms of this interaction need to be explored in future studies. Hostility-reduction interventions provided to high-hostile patients with a genetic predisposition to CAD may be relevant for primary and secondary CAD prevention.

Depression, Hostility, and Social Isolation in Patients with Coronary Artery Disease

Psychosocial risk factors such as depression, hostility, and social isolation are substantially more prevalent in patients with coronary artery disease (CAD) than is widely recognized. It has been demonstrated that patients with CAD who have these risk factors, individually or together, may have a substantially increased risk for recurrent ischemic events, as well as cardiac death, when compared with unaffected CAD patients. Numerous adverse physiologic changes that appear to occur as a consequence of these psychosocial risk factors have been identified, including increased platelet aggregation, hyperadrenergic states, elevated cortisol levels, abnormal endothelial function, and an increased propensity towards malignant ventricular arrhythmias. Each of these may explain the increased risk of recurrent coronary events (including death) among afflicted patients. Under-recognition, and hence under-treatment, remains a principal obstacle for improvements in the care of patients with CAD who have psychosocial risk factors. The diagnosis of psychosocial risk factors depends on systematic patient evaluation by experienced clinicians trained in the recognition of these disorders. All clinicians must be aware of the potential importance of these factors, their sometimes subtle presenting characteristics, and the available treatment options. The universal use of comprehensive cardiovascular rehabilitation offers the ideal conduit for such evaluation and management. Nonpharmacologic therapies for psychosocial risk factors include psychotherapy, stress-reduction techniques, and exercise therapy. Studies suggest that the reduction of social isolation among depressed patients with CAD may result in a reduced mortality rate in comparison with those without improvements in isolation. Pharmacologic therapies are mainly for the management of depression, and largely center on the use of selective serotonin reuptake inhibitors (SSRIs). Several SSRIs (paroxetine and sertraline) recently have been shown to be safe and effective for the treatment of depression in patients with ischemic heart disease. Whether use of antidepressants attenuate the increased cardiac risk from depression in the setting CAD remains to be proven; however, their use improves the quality of life in properly selected patients.

Social support and health behavior in hostile black and white men and women in CARDIA. Coronary Artery Risk Development in Young Adults

OBJECTIVE

These cross-sectional analyses of the Coronary Artery Risk Development in Young Adults (CARDIA) data were stimulated by previous CARDIA analyses that showed an adverse association between hostility and several health behaviors: physical activity, cigarette smoking, alcohol consumption, and caloric intake, in both black and white men and women, such that the higher the hostility, the worse the health behavior profile. The current study investigated whether high social support was associated with better health behavior than low social support in individuals with high hostility scores.

METHODS

The subjects were 5115 healthy black and white men and women ranging in age from 18 to 30 years. The hypothesis was that the association between hostility and certain adverse health behaviors would be diminished in the presence of high social support. Race-gender specific median cutpoints of the Cook-Medley Hostility scale and an index of social support defined levels of high and low hostility and social support.

RESULTS

After controlling for age and body mass index (BMI), support was positively associated with more exercise in all groups except black women, but when coupled with high hostility, this positive association between support and exercise remained only in men. White women with high support were less often smokers but this association did not hold when examined only in the high-hostile group. Black men and white women with high support in the presence of high hostility consumed more alcohol, but the amount was moderate.

CONCLUSIONS

We conclude that social support in the presence of high hostility only sometimes reduces the association of hostility to adverse health behaviors and that these effects are complex. Additional research investigating types of social support on health behavior in different race-gender groups is advocated.

Is platelet release of 2-arachidonoyl-glycerol a mediator of cognitive deficits? An endocannabinoid theory of schizophrenia and arousal

The discovery of blood platelet's ability to release 2-arachidonoyl-glycerol (2-AG), a highly lipophilic cannabinoid molecule may usher in a radical change in our understanding of how the vascular system interacts with the brain. This paper primarily extends Kayai's second messenger imbalance theory of schizophrenia, suggesting that 2-AG is the unidentified second messenger system that Kayai theorized was unbalanced in schizophrenia; furthermore, that a chronic over-release of 2-AG by platelets may be a causal factor in the cognitive deficits associated with negative symptom schizophrenia. Finally, platelet release of 2-AG may also be the causal agent in the cognitive deficits associated with states of high arousal, shock and in other conditions that feature heightened platelet activation. As such, heightened platelet activation may be a profoundly important vector for changing endogenous cannabinoid levels in the brain.

Platelets and psychiatry: lessons learned from old and new studies

Platelets play an important role not only in hemostasis but also in the pathophysiology of coronary artery disease. The complex interactions among the vascular endothelium, platelets, and blood components are one of the most exciting research areas today. This review addresses some fundamentals of platelet physiology and examines why platelets are interesting probes for neurophysiology. Results of current studies suggest that platelets are affected by diverse stressors, including psychological ones, and that platelets offer an interesting vantage point for understanding the neurophysiology of various psychiatric disorders. We also describe how platelets have been used for various types of research, including studies of stress associated with cardiovascular disease and studies of platelets in psychopharmacological research. Finally, we examine some of the psychiatric literature related to platelets; these studies range from case studies from the 1920s to contemporary experimental studies.

Going to the heart of the matter: do negative emotions cause coronary heart disease?

OBJECTIVE

Negative emotions, such as anger, anxiety, and depression, have emerged as potentially important risk factors for coronary heart disease. The purpose of this article is to consider the nature and function of emotions, to review epidemiological evidence for an association between the three negative emotions and coronary heart disease (CHD), to discuss briefly the mechanisms by which emotions may be linked to CHD, and to consider this evidence in light of theoretical insights provided by mainstream psychological research on emotions.

METHODS

We collected articles published between 1980 and 1998 on the relationship between each negative emotion and CHD. We also collected review articles or chapters published during the same time period that considered mechanisms by which emotions may increase CHD risk. We used a qualitative approach to review the published literature.

RESULTS

Evidence that anxiety is involved in the onset of CHD is strongest, whereas evidence for an association between anger and CHD is limited but suggestive. Although depression has consistently been linked to mortality following a myocardial infarction, evidence for its role in the onset of coronary disease is quite mixed. Numerous unresolved issues leave our current understanding of the emotion-health relationship incomplete. Psychological theories of emotion are considered to help address gaps in our knowledge.

CONCLUSION

Growing evidence indicates that negative emotions may influence the development of CHD. The focused and specific consideration of negative emotions and their possible role in the etiology of CHD gives insight into current knowledge and suggests important directions for future research.

Impact of psychological factors on the pathogenesis of cardiovascular disease and implications for therapy

Recent studies provide clear and convincing evidence that psychosocial factors contribute significantly to the pathogenesis and expression of coronary artery disease (CAD). This evidence is composed largely of data relating CAD risk to 5 specific psychosocial domains: (1) depression, (2) anxiety, (3) personality factors and character traits, (4) social isolation, and (5) chronic life stress. Pathophysiological mechanisms underlying the relationship between these entities and CAD can be divided into behavioral mechanisms, whereby psychosocial conditions contribute to a higher frequency of adverse health behaviors, such as poor diet and smoking, and direct pathophysiological mechanisms, such as neuroendocrine and platelet activation. An extensive body of evidence from animal models (especially the cynomolgus monkey, Macaca fascicularis) reveals that chronic psychosocial stress can lead, probably via a mechanism involving excessive sympathetic nervous system activation, to exacerbation of coronary artery atherosclerosis as well as to transient endothelial dysfunction and even necrosis. Evidence from monkeys also indicates that psychosocial stress reliably induces ovarian dysfunction, hypercortisolemia, and excessive adrenergic activation in premenopausal females, leading to accelerated atherosclerosis. Also reviewed are data relating CAD to acute stress and individual differences in sympathetic nervous system responsivity. New technologies and research from animal models demonstrate that acute stress triggers myocardial ischemia, promotes arrhythmogenesis, stimulates platelet function, and increases blood viscosity through hemoconcentration. In the presence of underlying atherosclerosis (eg, in CAD patients), acute stress also causes coronary vasoconstriction. Recent data indicate that the foregoing effects result, at least in part, from the endothelial dysfunction and injury induced by acute stress. Hyperresponsivity of the sympathetic nervous system, manifested by exaggerated heart rate and blood pressure responses to psychological stimuli, is an intrinsic characteristic among some individuals. Current data link sympathetic nervous system hyperresponsivity to accelerated development of carotid atherosclerosis in human subjects and to exacerbated coronary and carotid atherosclerosis in monkeys. Thus far, intervention trials designed to reduce psychosocial stress have been limited in size and number. Specific suggestions to improve the assessment of behavioral interventions include more complete delineation of the physiological mechanisms by which such interventions might work; increased use of new, more convenient "alternative" end points for behavioral intervention trials; development of specifically targeted behavioral interventions (based on profiling of patient factors); and evaluation of previously developed models of predicting behavioral change. The importance of maximizing the efficacy of behavioral interventions is underscored by the recognition that psychosocial stresses tend to cluster together. When they do so, the resultant risk for cardiac events is often substantially elevated, equaling that associated with previously established risk factors for CAD, such as hypertension and hypercholesterolemia.

Anger expression and incident stroke: prospective evidence from the Kuopio ischemic heart disease study

BACKGROUND AND PURPOSE

High levels of anger are associated with an increased risk of coronary heart disease and hypertension, but little is known about the role of anger in stroke risk.

METHODS

Anger expression style and risk of incident stroke were examined in 2074 men (mean age, 53.0+/-5.2 years) from a population-based, longitudinal study of risk factors for ischemic heart disease and related outcomes in eastern Finland. Self-reported style of anger expression was assessed by questionnaire at baseline. Linkage to the FINMONICA stroke and national hospital discharge registers identified 64 first strokes (50 ischemic) through 1996. Average follow-up time was 8.3+/-0.9 (mean+/-SD) years.

RESULTS

Men who reported the highest level of expressed anger were at twice the risk of stroke (relative hazard, 2.03; 95% CI, 1.05 to 3.94) of men who reported the lowest level of anger, after adjustments for age, resting blood pressure, smoking, alcohol consumption, body mass index, low-density and high-density lipoprotein cholesterol, fibrinogen, socioeconomic status, history of diabetes, and use of antihypertensive medications. Additional analysis showed that these associations were evident only in men with a history of ischemic heart disease (n=481), among whom high levels of outwardly expressed anger (high anger-out) predicted >6-fold increased risk of stroke after risk factor adjustment (relative hazard, 6.87; 95% CI, 1.50 to 31.4). Suppressed anger (anger-in) and controlled anger (anger-control) were not consistently related to stroke risk.

CONCLUSIONS

This is the first population-based study to show a significant relationship between high levels of expressed anger and incident stroke. Additional research is necessary to explore the mechanisms that underlie this association.

Increased serotonin receptor density and platelet GPIIb/IIIa activation among smokers

This study sought to determine whether depressive symptoms and/or platelet serotonin receptor (5HT2A) density are associated with increased platelet activation (PA) found among smokers. Flow cytometric detection of PA was used to study 36 smokers and 16 nonsmokers, aged 18 to 48 years. Subjects were tested at baseline and after either smoking 2 cigarettes (smokers) or a similar resting interval (nonsmokers). Assessment of PA included both platelet secretion and fibrinogen receptor (GPIIb/IIIa) binding. Platelet 5HT2A receptor binding and saturation were tested using [3H]LSD, and depressive symptoms were measured using the Beck Depression Inventory. Platelet 5HT2A receptor density was increased among smokers versus nonsmokers (82.7+/-67.7 versus 40.0+/-20.2 fmol/mg protein; P<0.005), and there was a dose-dependent relationship between receptor density and packs/d among smokers. Baseline wound-induced GPIIb/IIIa binding at 1 minute and GPIIb/IIIa binding in response to collagen stimulation in vitro was increased among smokers (P<0.05); there were no changes in PA among smokers after smoking, and platelet secretion was not elevated among smokers. Depressive symptoms were associated with 5HT2A receptor density among nonsmokers (P<0.005), but no such relationship was evident among smokers; PA was unrelated to 5HT2A receptor density in either group. The findings indicate that smoking is associated with increased platelet serotonin receptor density and with increased GPIIb/IIIa receptor binding, although these 2 factors are not related to each other or to depressive symptoms among smokers. Serotonergic dysfunction may be an important factor in the development of cardiovascular disease among smokers.