La onda R prominente en V1 pero no en V2 es un signo específico de infarto transmural lateral grande |
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Authors: | Daniele Rovai Gianluca Di Bella Giuseppe Rossi Alessandro Pingitore Antonio L’Abbate |
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Institution: | 1. CNR, Istituto di Fisiologia Clinica, Pisa, Italia;2. Cardiologia clínica, Fondazione Toscana Gabriele Monasterio, Pisa, Italia;3. Dipartimento di Cardiologia, Università di Messina, Messina, Italia;4. Instituto di Scienze della Vita, Scuola Superiore Sant’Anna, Pisa, Italia |
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Abstract: | Introduction and objectivesIn the absence of right ventricular hypertrophy or bundle-branch block, a prominent R wave in V1 or V2 is considered to reflect a lateral myocardial infarction. We investigated the differences in infarct location, size and transmural extent between patients with prominent R wave in V1 and those with prominent R wave in V2.MethodsWe studied 50 patients with a previous first infarction involving left ventricular inferior and/or lateral wall at contrast-enhanced magnetic resonance.ResultsA prominent R wave in V1 was present in 8 patients (16%), in V2 in 23 (46%). At magnetic resonance, the infarction involved the inferior wall in 11 patients (22%), the lateral wall in 6 (12%), and both walls in 33 patients (66%). The sensitivity of a prominent R wave in V1 in detecting a lateral infarction was low (17.9%), while the specificity was high (90.9%). The sensitivity and specificity of a prominent R wave in V2 were 46.2% and 54.5%, respectively. In patients with a prominent R wave in V1, infarct size and lateral and transmural extent were greater than in patients without this pattern (P<.005, <.001, and <.05, respectively); conversely, infarct size and transmural extent in the inferior wall and in its basal-posterior segment were not significantly different. In patients with a prominent R wave in V2, infarct size, lateral and transmural extent were not different from patients without this pattern.ConclusionsOnly a prominent R wave in V1 is a specific sign of large and transmural lateral infarction.Full English text available from:www.revespcardiol.org |
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Keywords: | ECG electrocardiograma IM infarto de miocardio RM resonancia magné tica VI ventrí culo izquierdo |
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