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In the article titled "Postmyocardial Infarction Complications Requiring Surgery," published in the November issue of the Archives (137:1580-1586, 1977), the eighth line from the bottom in column two on page 1580 should have read "point of maximal impulse (PMI)" instead of "postmyocardial infarction."
Medical Nonsense. Arch Intern Med. 1978;138(1):79. doi:10.1001/archinte.1978.03630250051017