Why the study?
Does a negative deflection of 1 mm or more in the P wave of lead V1 indicate left ventricular failure in patients with myocardial infarction?
Does a negative deflection of 1 mm or more in the P wave of lead V1 indicate left ventricular failure in patients with myocardial infarction?
A negative deflection of ≥1 mm in the P wave of lead V1 on ECG is a useful clinical indicator of left ventricular failure in patients with acute myocardial infarction.
May signal LV failure via ECG in acute MI; leaves open prospective validation before adoption.
Summary An investigation during a prospective study of myocardial infarction has confirmed previous observations of P wave changes in association with left ventricular failure. Although an indicator of pre-existing left ventricular disease as well as acute left atrial distension, a negative deflection of 1 mm or more in the P wave of lead V1 should raise strong suspicions about the presence of this serious complication.
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Hassell et al. (1970) studied this question.
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