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Background  In this study, we aimed to evaluate the coronary sinus ( CS ) morphology with three‐dimensional transthoracic echocardiography (3D‐ TTE ) in patients with supraventricular tachycardia ( SVT ) who underwent electrophysiological study ( EPS ).    Methods  This cross‐sectional study was conducted with 187 patients who underwent  EPS  between November 2016 and April 2017. Patients were divided into three groups: atrioventricular nodal reentrant tachycardia ( AVNRT ) (n = 72), non‐ AVNRT SVT  (n = 58), and normal  EPS  (n = 57). All patients were evaluated with electrocardiography,  TTE , and 3D‐ TTE .    Results  The  CS  diameter ( CSD ) and area ( CSA ) were found significantly lower in the normal  EPS  group than in the other groups. There was no significant difference in the  CSD  between  AVNRT  and non‐ AVNRT SVT  groups. However, it was found that the  CSA  was significantly larger in the  AVNRT  group than in the non‐ AVNRT SVT  group. In linear regression analysis, age and left atrial diameter were determined as independent predictor for CSD and CSA ( P  < 0.001 for each one).    Conclusions  The  CSD  and  CSA  assessed by 3D‐ TTE  were different and dilated in the patients with  SVT  compared to those in the normal individuals. There was no significant difference in the  CSD  between the  AVNRT  and non‐ AVNRT SVT  groups. However, the  AVNRT  group had a larger  CSA  than the non‐ AVNRT SVT  group.

Evaluation of coronary sinus morphology by three‐dimensional transthoracic echocardiography in patients undergoing electrophysiological study