Echocardiograpic Findings of Coronary Sinus in Heart Failure

ABSTRACT

BACKGROUND AND OBJECTIVES: The coronary sinus (CS) is a small tubular structure just below the tricuspid valve. The dilatation of the coronary sinus as well as the inferior vena cava and the hepatic vein may provide echocardiographic signs of systemic congestion. The aim of this study was to evaluate the correlation of size of coronary sinus that had abnormal echocardiographic findings with or without congestive heart failure. SUBJECTS AND METHODS: Echocardiographic examinations of coronary sinus were performed on 58 patients (M F=20 38) who had abnormal echocardiographic findings with current or previous symptoms or signs of congestive heart failure (group 1), and on 63 patients (MF=2736) who had abnormal echocardiographic findings but that had never had symptoms or signs of heart failure(group 2) and 94 healthy volunteers (control group, MF=5242). The CS was mesured using a two-dimensional echocardiogram in the right ventricular inflow view (5-10 mm below the Thebesian valve at end-systolic phase). RESULTS: In the normal control group, the median size of the CS was 6.2+/-1.2 mm, and showed no difference between gender and age. The sizes of the CS in groups 1 and 2 were 9.0+/-2.3 and 6.4+/-1.3 mm, respectively. There were differences between groups 1 and the normal control group (p<0.001), and between groups 1 and 2 (p<0.001), but a slight change between group 2 and the normal control group. In group 1, the size of the coronary sinus was related with the duration of heart failure (r=0.32, p=0.016), but no correlations to body surface area, left ventricle dimension and TR peak velocity were shown. In the presence of heart failure, as diagnosed according to the size of the CS, the predictive value was high when the size of the CS exceeded 8.0 mm, with an accuracy of 84%. In heart failure, the median size of the IVC was 16.6+/-5.4 mm, the variation rate of the IVC during the respiratory cycle was 0.40+/-0.13, and the variation rate of the CS during cardiac cycle was 0.31+/-0.20. The size of the CS was not related with the size of the IVC, but there was an inverse correlation between the size of the IVC and its variation rate (r=-0.434, p=0.037). The size of the IVC was inversely correlated with the variation rate of the CS (r=-0.490, p=0.024). There was a correlation between the variation rate of the CS and that of the IVC (r=0.411, p=0.021). Comparing the groups with and without systolic flow reversal into the CS in congestive heart failure patients with tricuspid regurgitation, in the former there wrer distensions of the CS, IVC and LA dimensions and reductions in the variation rates of the CS. CONCLUSION: The measurement of the size of the CS and the variation rate of CS may provide valuable information concerning the presence and duration of congestive heart failure.