The evaluation of the effect of coronary collateral formation on left ventricular function by using strain echocardiography

The aim of this study is to compare the strain echocardiography method, that we think, evaluate ventricular functions more accurately, and the other echocardiographic methods in patients with or without angiographically developed collaterals. Non acute coronary syndrome 45 patients with determined occlusion of the left anterior descending artery (LAD) over 90% were included in this study. Collateral vessel devellopping according to Rentrop classification, grade 0-1 patients were determined as Group I (n=24) , grade 2-3 patients determined as Group II (n=21). PW doppler, tissue doppler and strain echocardiography was applied. The peak strain levels in basal anteroseptal, midseptal and apical septal segments were significantly lower in Group I (p=0.04, p=0.01 and p=0.02 respectively). Also €peak I value was significantly lower in Group I (p=0.02). In Group I, postsystolic shortening index (PSSI) was found to be positively correlated with left ventricle end diastolic volume (LVEDV) (r=0.4, p=0.05), left ventricle end systolic volume (LVESV) (r=0.47, p=0.01) and wall motion score index(WMSI) (r=0.64, p=0.001) and negatively correlated with ejection fraction(EF) (r= -0.57, p=0.03) and mitral septal annulus systolic velocity (MSA S) (r= -0.49, p=0.01). In Group II, PSSI was positively correlated with left ventricle end diastolic diamater (LVESD) (r=0.5, p=0.01) and LVESV (r=0.5, p=0.01) and negatively correlated with MSA S (r= 0.45, p=0.03). In patients who have better developed collaterals have better left ventricle functions that were observed both by strain echocardiography and conventional echocardiographic methods.

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