Ch 106 - Cardiac Surgery Flashcards
Which coronary artery is dominant in dogs and cats?
- Dogs - left
- Cats - right
What is the first brach of the aortic arch?
Second?
- Brachiocephalic trunk
- Second = Left subclavian artery
What factors determine stroke volume?
- Preload
- Afterload
- Contractility
What kinds of cardiac procedures can be performed under venous inflow occlusion?
Short procedures under 4 minutes
For what amount of time can circulatory arrest be allowed for in normotheric and hypothermic animals (32-34C)?
- Normothermic - 2min
- Hypothermic - 4min
What is the lowest allowable temperature for hypothermic cardiac surgery?
32C - under this the risk of v-fib increases significantly
What vessels are tourniqueted for inflow occlusion?
- Caudal vena cava
- Cranial vena cava
- Azygous vein
What is the maximal time for aortic cross clamping during cardiac bypass?
90min
What is the main post-op complications of cardiac bypass?
SIRS
What breeds are predisposed to PDA?
- Poodles, Keeshonds, Maltese, Bichon, Torkies, COcokers etc
- Heritable component in Corgis and Poodles (hypoplasia and segmental asymmetry of the ductus muscle mass that results in failure of ductus contraction
What causes a reverse PDA?
Supresystemic pulmonary hypertension
What age is recommended for surgical treatment of a PDA?
- Older than 8 weeks and younger than 16 weeks
What is the reported residual flow thorugh a PDA after standard ligation and the Jackson-Henderson technique?
- Standard - 21%
- Jackson-Henderson 53%
What nerve course over a PDA?
Left vagus
What suture is recommended for PDA ligation?
2 silk sutures 2-0
What is the Branham reflex?
Increase in blood pressure and decrease in HR after ligation of a PDA