Ambulatory electrocardiography: an open-access service for general practitioners.

Access to ambulatory electrocardiography would enable general practitioners to investigate certain patients with cardiac symptoms without the need for hospital referral. An analysis has been made of the results in 200 consecutive patients referred to a pilot open-access service based at three health centres. Twenty-two GPs used the service, although there was a wide range (1-48) in the number of patients each referred. In 72 patients aged under 50 years, abnormalities other than extrasystoles were detected in only six; major significant arrhythmias were found in three patients, although treatment was required in only one case. Arrhythmias were frequent in patients aged over 50 years but were usually minor; 16/128 (13 per cent) showed major significant arrhythmias. Pacemakers were implanted in two patients. Palpitation and/or dizziness were reported during the period of monitoring by 39 per cent of patients (and were equally common in both age groups), but in neither age group did these symptoms correlate with the occurrence of a significant arrhythmia. In primary care, palpitation and dizziness are rarely due to significant arrhythmias. To increase the cost-effectiveness of the service, ambulatory monitoring could be restricted to patients over 50 years of age, except when there is other evidence of heart disease.