en تخصصي Special پژوهشي orginal article <span style="font-size:12pt"><span style="line-height:16.0pt"><span new="" roman="" style="font-family:" times=""><b><i><span style="font-size:9.0pt">Background & Aims</span></i></b><b><span style="font-size:9.0pt">:</span></b> <span style="font-size:9.0pt">The coronary venous system is an emerging field of interest for cardiologists with advancement of the electrophysiological procedures. Transcatheter coronary sinus interventional therapy is a promising method to treat coronary heart diseases. Thebesian valve (TV), Vieussens valve (Vv), and bend of the great cardiac vein (GCV) are commonly encountered obstacles in the passage of catheter. In this study, we aimed to evaluate the factors causing complications and obstruction to coronary venous catheterization. </span></span></span></span><br> <span style="font-size:12pt"><span style="line-height:16.0pt"><span new="" roman="" style="font-family:" times=""><b><i><span style="font-size:9.0pt">Materials & Methods</span></i></b><b><span style="font-size:9.0pt">:</span></b><span style="font-size:9.0pt"> In this cross-sectional observational study, we examined 110 formalin-fixed cadaveric hearts. The height of TV, the transverse and craniocaudal diameter of coronary sinus ostium (CSO), length, diameter, and angle of bend of GCV were measured. The presence or absence of Vv was noted. The morphological characteristics of TV and the percentage of CSO coverage by TV were recorded. </span></span></span></span><br> <span style="font-size:12pt"><span style="line-height:16.0pt"><span new="" roman="" style="font-family:" times=""><b><i><span style="font-size:9.0pt">Results</span></i></b><b><span style="font-size:9.0pt">:</span></b><span style="font-size:9.0pt"> The TV and Vv were observed in 91 (82.7%) and 59 (53.63%) specimens respectively. Remnant (8.2%), semilunar (52.1%), fold (10%), cord (3.6%), and fenestrated (8.2%) morphologies of TV were reported. In 16 (20.5%) hearts, Thebesian valve was covering more than 75% of CSO. Hearts with larger diameter of CSO presented smaller height of TV. The mean length and diameter of GCV were measured as 135.1 &plusmn; 31.6 mm and 4.31 &plusmn; 1.44 mm respectively. The mean angle of bend of GCV was calculated as 104.1 degrees. The acute angle was observed in 3.6% of specimens. </span></span></span></span><br> <span style="font-size:12pt"><span style="line-height:16.0pt"><span new="" roman="" style="font-family:" times=""><b><i><span style="font-size:9.0pt">Conclusion</span></i></b><b><span style="font-size:9.0pt">:</span></b> <span style="font-size:9.0pt">Knowledge of the obstructive anatomical structures and their variations can be helpful in the optimization of a more suitable invasive technique for invasive cardiology.<b>&nbsp; </b></span></span></span></span><span style="font-size:12pt"><span style="background:#d9d9d9"><span style="line-height:16.0pt"><span new="" roman="" style="font-family:" times=""><span style="font-size:9.0pt"></span></span></span></span></span> Coronary sinus, Great cardiac vein, Thebesian valve, Vieussens valve 139 146 http://ijrabms.umsu.ac.ir/browse.php?a_code=A-10-450-1&slc_lang=en&sid=1 Vandana Dave daveveenu@gmail.com 10031947532846004190 0009-0008-1011-0381 Yes Assistant professor, Department of Anatomy, Amrita Vishwa Vidyapeetham, Amrita School of Medicine, Faridabad Samta Gaur deorasamta@gmail.com 10031947532846004191 10031947532846004191 No Assistant professor, Department of Anatomy, Government Medical College, Pali, Rajasthan Vandana Mehta drvandanamehta@gmail.com 10031947532846004192 10031947532846004192 No Professor, Department of Anatomy, Vardhman Mahavir Medical College, New Delhi Manish Singh Ahuja msahujaone@gmail.com 10031947532846004193 10031947532846004193 No Professor, Armed Forces Medical College, Pune