CV Surgical Procedures Flashcards
CABG - uses
emergent vs. urgent vs. elective
coronary artery bypass graft
used to reperfuse coronary arteries once occluded
emergent: MI/CVA using cardiac catheter w/ or w/o a stent for scaffolding
urgent: symptoms/testing determine there is a blockage eg angina
elective: blockage found on stress test/imaging but asymptomatic, surgery for prevention of MI
CABG indications
50% L main coronary a. stenosis
70% stenosis proximal LAD and proximal circumflex aa.
3 vessel disease in stable angina
3 vessel disease w proximal LAD stenosis and poor L ventricular function
1-2 vessel disease w large area at risk for stable angina pt
70% proximal LAD stenosis w EF below 50% or demonstrate ischemia
disabling angina
ischemia with nSTEMI not responding to medicine
poor LV fx with viable myocardium that can be saved
factors contributing to decision to perform CABG
tortuosity of arteries/location/type
inability to perform PTCA/catheter to resolve symptoms
pts with advanced kidney disease making PTCA contrast dye dangerous
pro/cons of CABG vs PTCA
long term outcome: CABG better, esp high risk pts, than PTCA or medicine
expense: PTCA cheaper initially
risk: CABG has lower CVA/MI risk but has higher morbidity due to surgical risks, lower long term mortality
CABG approaches
sternotomy: midline sternum to attach 1-4x bypass
ant. thoracotomy: cut into chest from anterior through ribs to access LAD
lat thoracotomy: cut into chest from side to access smaller vessels
minimally invasive/robotic
MSK implications of CABG approach
pt is in awkward shoulder position for prolonged time, overstretching some muscles likely causing soreness post op
off vs on pump
off pump is heart beating during the surgery and pt is not on bypass
on pump: heart is stopped and but on bypass to give surgeon more time
disadvantages of ONCAB
post operative cognitive decline, which is often short lived but delays discharge
disadvantages of OFCAB
specially trained surgeon
clots could form
arrhythmias
loss of perfusion -> kidney issues
higher mortality
common harvest sites for grafts
saphenous vein
left internal thoracic artery
radial artery
arteries are better than veins bc they are less likely to reocclude
surgical complications of thoracic surgery
15-20%
infection of site
pain
blood loss
pulmonary complications: atelectasis, pneumothorax, PE, pneumonia, failure, endotracheal tube complication, fluid overload
cardiac complications: decreased CO, arrhythmia, bleeding, ischemia/MI/stroke/DVT
indications for valve repairs/replacements
stenotic valve
incompetent valve
rated scale mild 1+ to 4+
repair higher survival rate than replacement
types of valve repairs and replacements
surgical: mod-severe, replace valve ring, total repair
mechanical: replacement w mechanism for younger patients
biotissue: transplant from animal or human
TAVR
transcatheter aortic valve replacement
post CABG medications
anti platelet - clots
beta blockers - slow HR, BP, O2 demand, reduce angina
nitrates
ACE inhibitors
lipid lowering
pain meds
