Changes in Resting Electrocardiogram in Subjects 10 Years after Minor Abnormal Findings

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Background Subjects with minor abnormal ECG findings, such as counterclockwise rotation, clockwise rotation, axis deviation, low voltage, incomplete right bundle branch block, and RsR' pattern, are considered to require follow-up. We examined changes in the ECGs of these subjects after 10 years to evaluate whether follow-up is necessary.Methods Subjects who visited our hospital for health check-up in 1993 or 1994 were designated as having minor abnormal ECG findings (M, n=1539) or as having normal ECGs (N, n=1309), and the ECGs of these 2 groups were compared in 2003 or 2004, respectively. Serum lipids, plasma glucose, BP, and BMI for subjects with newly detected ischemic ECG findings (IC group) were compared with those for subjects with ECG findings that were relatively unchanged (S group).Results About 50% of the subjects showed similar ECG findings 10 years later. The percentage of newly detected ischemic findings in M was comparable to that in N. In the men in the IC group, serum lipids, BP, and BMI were higher than in the S group both in 1993 and 1994, and after 10 years. In the women in the IC group, BP was higher in 1993 and 1994, and had increased 10 years later.Conclusion Subjects with minor ECG abnormalities can be dealt with similarly to those with a normal ECG. However, annual ECG follow-up is important in cases of dyslipidemia, hypertension, or obesity. (Ningen Dock 2010; 24: 31-38)
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