The diagnostic value of the repolarization pattern in the electrocardiographic lead V6
Insights
T wave inversion in lateral electrocardiogram (ECG) leads can be challenging. Marked asymmetry and terminal positivity in V6 repolarization patterns may indicate hypertension or aortic valve disease, even without standard left ventricular hypertrophy voltage criteria.
Area of Science:
- Cardiology
- Electrocardiography
- Diagnostic Imaging
Background:
- T wave inversion in lateral electrocardiogram (ECG) leads is a common diagnostic challenge.
- Differentiating lateral ischemia from left ventricular hypertrophy (LVH) often relies on voltage criteria with low sensitivity.
Purpose of the Study:
- To analyze the repolarization pattern in lead V6 in patients with T wave inversion.
- To correlate specific T wave abnormalities with diagnoses of ischemia, hypertension, or aortic valve disease.
Main Methods:
- Analysis of V6 repolarization patterns in 100 consecutive patients with T wave inversion (≥1 mm).
- Exclusion of patients on digoxin.
- Correlation of ECG findings with clinical diagnoses.
Main Results:
- Two T wave abnormalities—marked asymmetry and terminal positivity (overshoot)—showed significant association with aortic valve disease and hypertension.
- These repolarization features were observed even when standard voltage criteria for LVH were absent.
Conclusions:
- Marked asymmetry and terminal positivity of T waves in lead V6 are potential indicators of hypertension or aortic valve disease.
- These findings can aid in diagnosing LVH in the absence of traditional voltage criteria, improving ECG interpretation.
Abstract:
T wave inversion confined to the lateral leads presents one of the commonest dilemmas in the field of electrocardiogram (ECG) reporting. The differentiation between lateral ischaemia and left ventricular hypertrophy is generally based on the presence or absence of the accepted voltage criterion of hypertrophy, even though this is admitted to have a relatively low degree of sensitivity. In this study the repolarisation pattern in V6 has been analysed in a consecutive series of 100 patients showing T inversion of at least 1 mm in this lead, and correlated with the diagnosis. Patients on digoxin or similar drugs were excluded. Thirty-four patients were diagnosed as having hypertension or aortic valve disease or a combination of the two conditions: 31 as pure ischaemic heart disease; 24 as a combination of ischaemic and hypertensive or aortic valvular disease and 11 as having miscellaneous diseases. Two abnormalities of the T wave showed a significant association with aortic valve disease and hypertension; namely marked asymmetry and terminal positivity (overshoot). These features were sometimes seen in these diseases when the commonly acceptable voltage criterion of left ventricular hypertrophy was lacking.
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