The patients' longitudinal course was followed to determine the predictors of continued somatization and chronicity, and to study their medical care by examining the referring physicians' diagnostic impressions and interventions. By comparing cardiac symptoms with concurrent cardiac activity during Holter monitoring and ETT, the investigators hoped to develop measures of cardiac awareness. They would then be able to describe inter-individual differences in cardiac awareness, examine several psychological factors which amplify or modulate awareness, and investigate the relationship between somatization and accuracy of symptom reporting. It was hoped that the findings would ultimately lead to improved cognitive and educational techniques to reassure and palliate palpitation patients, and to the early identification of patients who were unlikely to obtain symptomatic relief from antiarrhythmic therapy.