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: dr s venkatesan 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
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