Applied anatomy of percutaneous transcatheter closure of interventricular septal defect in membranous part

Objective: To provide anatomical basis for percutaneous transcatheter closure of interventricular septal defect. Methods: Thirty-eight adult heart specimens (25 male and 13 female) were dissected and measured. Results: The shape of interventricular septum menbranous part may be classified imto triangle type, circle type, and oval type. The proportions of every type were 58% (22 specimens) , 23. 7% (9 specimens) and 18. 3(7 specimens) respectively. The height of membranous interventricular septum on the side of left ventricle was 8. 79±2. 27 mm and 6. 43±1. 43 mm on the side of right ventricle. The length of interventricular septum membranous part was 9. 37 ±2. 52 mm. The thickness of the upper part, lower part, front part, back part and central part was 0. 80±0. 19 mm, 0. 70±0. 16 mm, 0. 78±0. 28 mm, 0. 75±0. 15 mm and 0. 52±0. 13 mm respectively. Conclusions: Interventricular septum membranous part was mostly triangle shape. It was mainly located at the back lower part of supraventricular crest. The membranous part on the side of left ventricle was higher than or near to that on the side of the right ventricle. It is suggested that when it comes to the blockage membranous interventricular septum it is easier to enter from rigth ventricle and that the area of blockage apparatus on the side of the left ventricle should be larger than that on the side of the right ventricle.