Physiological Interventricular de-synchrony : Right ventricle contracts like an Intestine !

Right ventricle,being a venous chamber has distinct anatomical and physiological features to carry out this function.RV has a complex shape, its triangular in long axis and  crescent like in short axis , thin (<5mm)  more distendable  .Contraction of RV begins slightly early but ends later than LV  (30ms ) https://www.youtube.com/watch?v=GH5trHYjozI RV receives blood from RA and ejects in to PA in a sequential manner .The inflow, body and outflow contract somewhat like  intestinal peristalsis. This is facilitated  by the incremental  delay in the electrical depolarization of right ventricle.In physiological conditions, the later half of QRS  is  responsible for RV activity and RVOT is the last to contract. (This intrinsic electrical and mechanical  delay in RV contraction is a physiological inter ventricular  desynchrony . One  should be aware of this when planning cardiac resynchronisation therapy in cardiac failure.  ) Click over the image for an animation of RV contraction. Image courtesey Oxford spcialist hand book in cardiology :Echocardiography Paul Leeson , Second edition ,.Oxford university press 2012 Multi media . Note:LV is  a fairly   elliptical and strongly  muscular pump and contracts in a  single go with maximum force.(dp/dt). Final message Though both right and  left ventricle originate from same  straight heart tube , developmentally the right ventricle evolves for a different form and function . Now,we realise there are lots of sharing ...
Source: Dr.S.Venkatesan MD - Category: Cardiology Authors: Tags: Anatomy of heart Right ventricle best articles on right ventricle cardiac peristalsis physiological inter ventricualr desynchrony Right ventricle anatomy and physiology right ventricular sequential peristaltic contraction Source Type: blogs