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Extra info for Advances in Electrocardiograms - Clinical Applns.

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3. 1 Definition: Premature atrial contraction (PAC), or atrial premature beat, is a premature discharge arising from an atrial focus other than the sino-atrial (SA) node. 2 Incidence: PACs were reported in 14% of full-term infants on 24-hour ECGs (Southall et al. 1980). Among 10-13 year old boys with healthy hearts, 13% had singlet PACs (Scott et al. 42 Advances in Electrocardiograms – Clinical Applications Fig. 1. Sinus arrhythmia 1980). On 24-hour ECG monitoring, 64% of young women (Sobotka et al.

This differs from many previous studies of either more narrowly defined high-risk populations of patients referred to electrophysiologists or more broadly defined low-risk community epidemiological cohorts. These differences may be an advantage as our study is clinically based and includes all patients at our facility referred for an ECG. Base-line clinical data, laboratory studies and diagnostic tests such as echocardiograms or cardiac catheterizations were not available. Information on medications, especially beta-blockers, would have been very useful.

Logistic regression was performed with PVCs as the dependent variable and with the following independent variables: age, gender, abnormal/normal ECG classification, PVCs present or absent and in- or outpatient status. 30 Advances in Electrocardiograms – Clinical Applications 4. 8%). Demographic and ECG characteristics of the groups are shown in Table I. The group with PVCs was older than those without PVCs (mean age  SD: 65  12 vs. 001). As this was a VA study, the patients are 90% male but there was a slightly higher percentage of men among those with PVCs (90% vs.

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