Duroziez ’s murmur : A simple bedside marker of diastolic descending Aortic flow reversal & VTI

Murmurs are audible noises from within the Heart or vascular tree when blood flow loses its laminar flow and becomes turbulent. There are many factors responsible for it (Recall Reynold’s number ).It is obvious, that when there is hyperdynamic circulation, even in physiology one may hear a murmur. Pregnancy is a classical example and Innocent (still murmur) in children is another one. Duroziez murmur: A brief history  In this post let us dwell on something about a classical murmur that occurs in the peripheral circulation away from the action-packed organ heart. It was originally described by French physician  Dr Duroziez  two centuries ago. (In his own words it was called a double crural murmur ). This happened shortly after Lennec’s new era of auscultation began. When everyone was concentrating on the heart Dr. Duroziez was curiously auscultating the legs and found this crural murmur. For this out-of-the-box thinking, he is still being remembered. In significant aortic regurgitation, we know a substantial amount of blood regurgitates back into LV. This backflow though happens in the chest and into the LV,  it is reflected all over the vascular tree. It so happens, the entire aortic forward flow for a moment slows in end-systole or even reverses at the end-systole and early diastole when the Aortic valve leaks. Almost all peripheral signs of AR are due to this. It is critical to remember, that these signs are heavily modified by arterial distensibility, as...
Source: Dr.S.Venkatesan MD - Category: Cardiology Authors: Tags: Aortic regurgitation Uncategorized cardiology research topic cardiology thesis topic classification of murmur double crural murmur mechanisim of Duroziez murmur peripheral signs of aortic regurgitation Source Type: blogs