Cardiac Flashcards
1
Q
Retrograde cardioplegia is good for …
A
severe AI, severe CAD, complex or abnormal aortic root surgeries
2
Q
limitation of retrograde cardioplegia
A
doesn’t get to RCA or anterior free wall territory very well
3
Q
when do we use deep hypothermic circulatory arrest?
A
pulmonary thromboembolectomy or complex aortic arch work (15-22 degrees, complete arrest of blood flow)
4
Q
when would we use ventricular fibrillation as protection?
A
brief aortic cross clamping - don’t want to increase myocardial stress against that afterload.
5
Q
what happens autonomically to donor heart?
A
no parasympathetic - denervated from cutting autonomic cardiac plexus. Will respond to direct actors (epi, dobutamine) but not indirect or PSNS (atropine, ephedrine)
(resting HR 90-110)
