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Louis Pelner, MD
Brooklyn

JAMA. 1973;226(1):78.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor.—

The enclosed leads were taken from the graph of a patient who had been taking unnecessary precautions against his usual activities because a Q wave in lead III and lead aV_F were found.

The presence of a Q wave in lead III alone is of minor importance. However, when such a change is associated with the appearance of a deep Q wave in aV_F, there exists strong evidence of the presence of an inferior wall infarct. It could also mean a horizontal heart. Lead aV_F is inscribed from an electrode that faces the posterior-inferior (diaphragmatic) surface of the heart. If the position of the heart is altered (eg, by deep breathing) with respect to the electrode, the portion of the heart that faces the electrode will be a different one. If deep breathing eliminates the deep Q waves from lead III and lead aV . . . [Full Text PDF of this Article]

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