Abstract
Pathologic Q waves on the surface electrocardiogram often reflect transmural myocardial infarction. 1 Gunnar RM Pietras RJ Blackaller J et al. Correlation of vectorcardiographic criteria for myocardial infarction with autopsy findings. Circulation. 1967; 35: 158-171 Crossref PubMed Scopus (68) Google Scholar , 2 Horan LG Flowers NC Johnson JC Significance of the diagnostic Q wave of myocardial infarction. Circulation. 1971; 43: 428-436 Crossref PubMed Scopus (195) Google Scholar Intraventricular conduction defects may sometimes be responsible for pathologic Q waves, erroneously suggesting infarction. 3 Rosenbaum MB Elizari MV Lazzari JO The Hemiblocks. Tampa Tracings, Oldsmar, Florida1970 Google Scholar , 4 Gambetta M Childers RW Rate dependent right precordial Q waves: “Septal focal block.”. Am J Cardiol. 1973; 32: 196-201 Abstract Full Text PDF PubMed Scopus (40) Google Scholar In addition, evidence of myocardial infarction may be concealed by the development of intraventricular conduction defects. 3 Rosenbaum MB Elizari MV Lazzari JO The Hemiblocks. Tampa Tracings, Oldsmar, Florida1970 Google Scholar This report describes a patient with acute diaphragmatic infarction in whom development of transient left anterior hemiblock (with possible septal fascicular block) concealed a diaphragmatic infarction and simulated anteroseptal infarction.
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