Background: Myocardial infarction (MI) accompanies with different mechanical complications including ischemic mitral regurgitation (IMR) which is correlated with increased risk of mortality and heart failure. IMR existence and its severity had significant prognostic effect on patients' mortality following acute myocardial infarction (AMI). Echocardiography is the choice imaging modality for the diagnosis and assessment of IMR and establishing its etiology. IMR usually results from papillary muscle displacement, ventricular dilation and remodeling with reduced closing forces.
Objective: Assessment of the correlation between echocardiographic severity of ischemic mitral valve regurgitation following acute myocardial infarction and its electrocardiographic location.
Patients and methods: This was a prospective study that included 100 patients admitted to CCU OF Beni-Suief General Hospital in the period from October 2019 to May 2020 . Those patients were divided on two equal groups: Group I: patients with STEMI and no, trivial or mild MR and Group II: patients with STEMI and moderate or severe MR.
Results: Mean age of group I involved in the study was 55.44 ± 7.23 years and 70% of them were males. Mean age of group II was 58.38 ± 7.8 and 56% were males. 70 % of the group II had inferolateral STEMI compared to group I who had more anterior STEMI. Group II were more smokers with hyperlipidemia. Group II was with higher previous stable and unstable angina, with less streptokinase treatment, with higher abnormal chest radiogrgh and higher killip class. Group II had significantly lower EF and higher LVEDD, LVESD, LA diameter, RV diameter, MV A velocity, tricuspid valve excursion TAPSI and pulmonary artery pressure and more diastolic dysfunction. Mechanism of IMR in case group was mono leaflet tethering in 43 cases, both leaflet tethering in 7 cases and ring dilation in 30 cases. MR jet direction was medial commissure posterior in 31 (62%), lateral commissure anterior in 12 (24%), and both commissures central in 7 (14%) cases.
Conclusion: Mitral regurgitation is common after acute myocardial infarction, especially in cases with inferior mitral regurgitation. The echocardiographic findings are indicative of left ventricular remodeling and abnormality of mitral valve apparatus.