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Although an indicator of pre-existing left ventricular disease as well as acute left atrial distension, a negative deflection of 1 mm or more in the P wave of lead V1 should raise strong suspicions about the presence of this serious complication.<\/jats:p>","DOI":"10.1136\/pgmj.46.537.428","type":"journal-article","created":{"date-parts":[[2008,12,29]],"date-time":"2008-12-29T20:27:15Z","timestamp":1230582435000},"page":"428-429","source":"Crossref","is-referenced-by-count":3,"title":["P wave abnormalities with myocardial infarction: an aid to the diagnosis of left ventricular failure"],"prefix":"10.1093","volume":"46","author":[{"given":"T A","family":"Hassell","sequence":"first","affiliation":[{"name":"University College Hospital , London, W.C. 1"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"B I","family":"Hoffbrand","sequence":"additional","affiliation":[{"name":"University College Hospital , London, W.C. 1"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[1970,7,1]]},"reference":[{"key":"ref_1","author":"AREVALO, A.C.; SPAGNUOLO, M.; FEINSTEIN, A.R.","year":"1963","unstructured":"AREVALO, A.C., SPAGNUOLO, M. & FEINSTEIN, A.R. 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