ABSTRACT
Background and objectives: Moderator band is a specialized bridge present between the base of the anteriorpapillary muscle and interventricular septum. It carries the right branch of the bundle of HIS with it. The band isknown to prevent the over distension of the right ventricle during the diastolic phase. There is a need of lot ofresearch and studies on the septomarginal trabecula as it proves to be important clinically. Here we measuredthe length, breadth, height, angle with the interventricular septum, and the superficial marking of Moderatorband on the sternocostal surface of the right ventricle is done. This paper describes the morphological variationsfound in its origin and insertion.Materials and Methods: 15 formalin-soaked cadaveric hearts were taken from the Department of Anatomy ofKVG Medical College, Sullia. The foetal hearts, the hearts with gross pathology, if any are excluded from the study.Result: The morphometric parameters are tabulated and the morphological variations are noted. The results arecompared with the results of the previous studies on the moderator band.Conclusion: It is confirmed that the thickness of moderator band varies at its origin and insertion. The surfacemarking of moderator band on sternocostal surface of the heart will help in locating the moderator band throughthe echocardiography and during cardiac surgeries on right ventricle. The possibility of second moderator band,multiple origin or insertion is more than 20%.
ABSTRACT
PURPOSE--To evaluate possible morphological changes in chronic chagasic of the right bundle trabecular branch (RB) with right branch block (RBB) and to draw clinicopathological correlations. METHODS--Eight RBB chronic chagasic septo-marginal trabeculae (SMT) (group A), six left branch block (LBB) chagasic SMT (group B) and six SMT from non-chagasics with no heart disease (group C) were analyzed. Every SMT was completely embedded in paraffin, sub-serially sectioned to the end of the paraffin-block and the sections were processed for pathological study. RESULTS--Right bundle branch trabecular segment mononuclear infiltrate and/or fibrosis were found for 87.5 (7/8) of group A, 50 por cento (3/6) of group B and 16.6 por cento (1/6) of group C. Moderate mononuclear infiltrate and fibrosis were noted respectively for 3 and 1 cases, from group A. For the remaining group A cases and for all the group B and C cases the mononuclear infiltrate and fibrosis were slight. CONCLUSION--The frequency and degree of RB lesions might explain some of RBB. On the other hand, the absence of lesions in one case RBB and the slight degree of RB lesions in chagasics with LBB and in one non-chagasic case indicate that sometimes it is not possible to establish electrocardiographic-pathological correlations after TSM histological examination