Why the study?
Does recording from lower chest and abdominal leads help differentiate QS/QR patterns in V3/V4 caused by myocardial infarction from those occurring in the absence of infarction?
Population
Patients presenting with a QS or QR pattern in leads V3 and V4, both with and without myocardial infarction.
Design
Cross-sectional
Authors
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Lower leads may differentiate noninfarct from infarct QS/QR in V3/V4; leaves open prospective validation before clinical adoption.
Does recording from lower chest and abdominal leads help differentiate QS/QR patterns in V3/V4 caused by myocardial infarction from those occurring in the absence of infarction?
Recording leads from positions below the standard level of V3 and V4 can help differentiate non-infarction QS/QR patterns (which show an initial R wave) from true myocardial infarction (which show a Q wave).
Surawicz et al. (1955) studied this question.
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