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Biobehavioral variables and mortality or cardiac arrest in the Cardiac Arrhythmia Pilot Study (CAPS)
D K Ahern1, L Gorkin, J L Anderson
1Institute for Behavioral Medicine, Providence, Rhode Island 02906.
Insights
Following a heart attack, specific behaviors and psychological states like depression and Type B behavior pattern predict cardiac events. Lower pulse rate reactivity also emerged as a significant risk factor for mortality or cardiac arrest.
Area of Science:
- Cardiology
- Psychosocial Medicine
- Behavioral Science
Background:
- Ventricular premature complexes and impaired left ventricular ejection fraction predict cardiac mortality post-myocardial infarction.
- Psychosocial factors like depression and Type A-B behavior pattern are implicated in cardiac events, but findings are inconsistent.
- Biobehavioral factors require further investigation as predictors of cardiac events.
Purpose of the Study:
- To test the predictive association between biobehavioral factors and clinical cardiac events.
- To evaluate the role of psychosocial and physiological reactivity in cardiac outcomes.
- To investigate risk factors in patients post-myocardial infarction within the Cardiac Arrhythmia Pilot Study (CAPS).
Main Methods:
- Prospective clinical trial involving 502 patients 6-60 days post-myocardial infarction.
- Assessed ventricular premature complexes and nonsustained ventricular tachycardia.
- Collected baseline behavioral data including psychosocial questionnaires and physiological reactivity (blood pressure, pulse rate) to a videogame challenge.
Main Results:
- Type B behavior pattern, higher depression levels, and lower pulse rate reactivity were significant risk factors for mortality or cardiac arrest.
- These associations remained significant after adjusting for clinical predictors of disease severity.
- The study identified specific biobehavioral markers associated with adverse cardiac outcomes.
Conclusions:
- Biobehavioral factors, including Type B behavior, depression, and pulse rate reactivity, are significant predictors of cardiac mortality and arrest post-myocardial infarction.
- These findings highlight the importance of considering psychological and physiological responses in cardiac risk assessment.
- Further research is warranted to explore the interplay between behavioral factors and cardiac endpoints.
Abstract:
The frequency of ventricular premature complexes and the degree of impairment of left ventricular ejection fraction are major predictors of cardiac mortality and sudden death in the year after acute myocardial infarction. Recent studies have implicated psychosocial factors, including depression, the interaction of social isolation and life stress, and type A-B behavior pattern, as predictors of cardiac events, controlling for known parameters of disease severity. However, results tend not to be consistent and are sometimes contradictory. The present investigation was designed to test the predictive association between biobehavioral factors and clinical cardiac events. This evaluation occurred in the context of a prospective clinical trial, the Cardiac Arrhythmia Pilot Study (CAPS). Five-hundred two patients were recruited with greater than or equal to 10 ventricular premature complexes/hour or greater than or equal to 5 episodes of nonsustained ventricular tachycardia, recorded 6 to 60 days after a myocardial infarction. Baseline behavioral studies, conducted in approximately 66% of patients, included psychosocial questionnaires of anxiety, depression, social desirability and support, and type A-B behavior pattern. In addition, blood pressure and pulse rate reactivity to a portable videogame was assessed. The primary outcome was scored on the basis of mortality or cardiac arrest. Results indicated that the type B behavior pattern, higher levels of depression and lower pulse rate reactivity to challenge were significant risk factors for death or cardiac arrest, after adjusting statistically for a set of known clinical predictors of disease severity. The implication of these results for future research relating behavioral factors to cardiac endpoints is discussed.