Abstract
Objective To prove the sequential, contraction of ventricular myocardial band (VMB). Methods Healthy maledogs (n= 10) underwent thoracotomy and tin beads were placed into myocardium based on the spatial trajectory of VMB. At the sec-ond,third week after surgery, the movement of tin beads were recorded by digital subtraction centiography (DSC). Results The fol-lowing sequence of contraction was observed in dog heart. There were significant differences at the initiation moment of contraction ofeach segment in VMB ( P < 0.01 ). Basal loop originated shortening at the earliest stage, descending segment (DS) closely followed,and ascending segment (AS) initiated shortening at latest moment (P<0.01). There were significant differences at the terminationmoment of contraction of each segment in VMB ( P < 0.01 ). DS stops shortening during the rapid filling phase, but AS stopped short-erring at later moment (40-80 ms) than DS. Such, active shortening continues during the period of isovolumetric relaxation. Conclu-sion The study supports Torrent-Guasp's hypothesis on sequential contraction of the heart. Key words: Myocardium Radiography Ventricular myocardial band Sequential contractions
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