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q____________? - sarim - Printable Version +- USMLE Forum - Largest USMLE Community (https://www.usmleforum.com) +-- Forum: USMLE Forum (https://www.usmleforum.com/forumdisplay.php?fid=1) +--- Forum: Step 1 (https://www.usmleforum.com/forumdisplay.php?fid=2) +--- Thread: q____________? - sarim (/showthread.php?tid=579713) Pages:
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q____________? - sarim - ArchivalUser - 04-12-2011 A 60 y/o man on the cardiology ward presents with a hx of myocardial Infarction.ECG shows a broaden QRS complex, no R wave in V1, and a tall, wide R wave in V6.Splitting of the S2 heart sound increases upon expiration and decreases upon inspiration.What underlying pathology would explain these clinical findings ? A-AV nodal re-entry B-Damage to the left bundle branch C-Damage to the right bundle branch D- First degree AV block E- Pre-excitation syndrome 0 - ArchivalUser - 04-12-2011 B is the answer 0 - ArchivalUser - 04-12-2011 C..? 0 - ArchivalUser - 04-12-2011 B. 0 - ArchivalUser - 04-12-2011 bb. I think because increases during expiration--> left-sided 0 - ArchivalUser - 04-12-2011 yes,expiration causes inc.S2.....so left heart side problem, ![]() 0 - ArchivalUser - 04-12-2011 very well ![]() What happen to S2 splitting in "Mitral Regurgitation" ? and how ? 0 - ArchivalUser - 04-12-2011 ouch, I always have hard time with Qs like that. I would assume that there is a delay in a closure of aortic valves. 0 - ArchivalUser - 04-12-2011 so, the closure of pulmonic valves would be first, followed by aortic valves closure. 0 - ArchivalUser - 04-12-2011 I think there is no direct change on S2 splitting in MR...because S2 splitting due to the closure of Aortic and Pulmonic valve and if there is stenosis of these 2 valves.....the S2 spliting changes significantly. |