dncosta
Licensed, finally
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Mitral valve
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| forumdoctor
Forum Senior
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mitral valve
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| new_n_lost
Politically InCorrect
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Mspocanos....... this is a UW question can u plz post the Horrible Explanation by UW
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| mspocanos
Forum Newbie
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I dont understand why the answer is NOT coronary sinus. Doesn't the coronary sinus empty into the Right atrium near the IVC, so it would be passed before even puncturing the fossa ovalis.
Explanation from UW:
The aim of cardia cath is to measure Left ventricular and aortic pressures. Cath must pass into Left ventricle and aorta. Fossa ovalis is a oval shaped depression on septal wall of R atrium. It lies in the location of the obliterated fetal foramen ovale. Catheter entered via femoral vein will follow venous blood flow to the IVC that drains into the right atrium. By puncturing the fossa ovale the catheter will pass from R atrium directly into L atrium. To gain access to L ventricle, catheter will pass through mitral valve.
The explanation says the coronary sinus drains into the L atrium, but like I said before, doesnt it drain into the right atrium around the inferior vena cava and hence be the first structure passed?
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| dncosta
Licensed, finally
Topics: 19
Posts: 604
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mspocanos, you're right about the coronary sinus location. It drains into the RIGHT atrium (UW got it wrong). BUT, the catheter should not pass this ostium because it is located slightly lateral (to the left) to the fossa ovalis (if the catheter comes from the IVC, it goes straight to the fossa ovalis without passing through the coronary sinus (see attached image).
Attached Files:
Gray493.png (66 KB, 29 downloads)
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| arlete
Intern in 2009!!!!!
Topics: 36
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They should have asked which structure it passes through first...
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| forumdoctor
Forum Senior
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Read the q again.They are asking, which structure will be passed first, after puncturing fossa ovalis. So it has to be mitral valve.
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| lq2006
Forum Elite
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Mitral valve
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