كاربرد داپلر ترانس كرانيال در ارزيابي خطر سكته مغزي در بيماران با دريچه مكانيكي ميترال

Transcranial Doppler application for risk assessment of stroke in patients with mechanical mitral valve

Introduction: Observing microembolic signals in brain vessels by transcranial Doppler technology is a very common finding in patients with mechanical heart valve. These signals are almost always clinically asymptomatic. The aim of this study was assessment of transcraniai Doppler in detecting probability of stroke in patients with mechanical hean: valve. Methods: This descriptive study was carried out all 22 patients with St Jude prosthetic mitral valve, in 2005. Prevalence and frequency of mieroernbolic signals were assessed during one hour and prothrombine time (PT) and International Normalized Ratio (TNR) of patients were evaluated during middle cerebral artery monitoring. Correl ation of cardioernbolic stroke , severity of anticoagulant therapy and atrial fibrillation was considered with Mean Frequeney Scale of Microembolic Signals (MFSMS). Data analysis was preformed by Mann-Whitny tes: and P