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Right ventricular myocardial infarction: presentation and acute outcomes.
Angiology 2005
Acute inferior wall myocardial infarction can be complicated by right ventricular myocardial infarction (RVMI), and the excess mortality cannot be fully explained by mechanical reasons. The authors try to systematically assess the incidence, clinical presentation and early outcomes of right ventricular infarction in a tertiary-care setup. Their study was a prospective observational series of consecutive patients with RVMI. All patients with acute inferior myocardial infarction (n=135) were enlisted. RVMI was diagnosed by > or = 1 mm ST elevation in lead V(4R) in a right-sided electrocardiogram. Right ventricular (RV) infarction occurred in 37% (n=50) of patients with acute inferior infarctions. Patients with isolated inferior infarction served as controls (n=85). Echocardiography was performed within 24 hours of admission. From both groups, 66% qualified for thrombolysis. The incidence of hypotension-bradycardia and heart blocks requiring pacing support was much higher in right ventricular infarction (n=21) than in inferior infarction (n=13). Clinically manifest RV dysfunction (raised jugular venous pulse [JVP], hypotension, tricuspid regurgitation) and right ventricular dilation detected by echocardiography were seen in only 13 patients. The in-hospital mortality rate was significantly higher (n=8, 16%) in right ventricular infarction group than in inferior infarction group (n=3, 3.5%). Right ventricular infarction was seen in a third of inferior myocardial infarctions (IMIs), but hemodynamically evident right ventricular dysfunction occurred in only a tenth of acute IMIs. Nevertheless, the acute in-hospital mortality rate of patients with right ventricular infarction was much higher than in those with inferior infarction owing to arrhythmic and mechanical complications.
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