Incidence of Mitral Regurgitation in Patients with Acute posterior ST-Elevation Myocardial Infarction and Its Relationship with extension of Myocardial Infarction

Introduction- Ischemic mitral regurgitation (MR) is frequently seen after the acute ST elevation myocardial infarction (MI) and is an independent predictive factor for long-term cardiovascular morbidity and mortality after MI. Timing and severity of MR after MI is relevant to the type and extent of MI. We sought to evaluate the incidence and severity of MR in pure posterior MI. Material and Method-In our case-control study, we enrolled 30 patients with first MI. The patients were divided into two groups: one with pure posterior MI (8 patients-group 1 ) and another one posterior MI accompanied by inferior and/or lateral MI (22 patients-group2). Echocardiographic evaluation was done on the third day after MI in both groups, and the severity of ischemic MR was determined based on the American Echocardiographic Association’s guideline. All patients receive thrombolytic. Results-The mean age and risk factors were similar in the both groups. The incidence of significant MR in pure posterior and in posterior-infero/lateral MI groups were 62.5% and 36.3%, respectively (p value < 0.05) .The main pathology in both groups was ischemia and mono or bi-leaflet tethering. In addition, ejection fraction and mortality rate were lower in the group 2 (p value < 0.05). Conclusion-Our findings showed that significant ischemic MR was prevalent in patients with Pure posterior MI.