Perf Tech Test 5

Question 1

Coronary Blood Flow determined by 2 factors

Answer 1

• perfusion pressure

- coronary vascular resistance

Question 2

Delivery of Oxygen 2 factors

Answer 2

• coronary blood flow

- oxygen content

Question 3

Coronary Perfusion Pressure (eq)

Answer 3

CPP= DBP - LVEDP (or LAP)

normal= 60-80 mmHg

Question 4

Pre-ischemic Interventions

Answer 4

• minimize on going ischemia (drugs)
• prevent distention (vent)
• preconditioning (periodically introduce ischemia)

Question 5

Why give CPG

Answer 5

inactive heart, bloodless field, persevere muscle, lower O2 demand

Question 6

Cardiac Action Potential Phases

Answer 6

0-Na in
1- little K out
2- Ca in (contraction)
3- K out
4- Na/K pump

Question 7

3 Types of Cardioplegia

Answer 7

• Potassium Arrest= high K, no 3
• Custodial HTK= low Na, no 0 (mimics intracellular)
• Del Nido 1:4= low Ca, no 2 (mimics extracellular- plasmalyte based)

Question 8

Antegrade Pressure and Flow

Answer 8

in line pressure= 125-150, Aortic Root= 50-100

flow= 250-400 ml/min

Question 9

Retrograde Pressure and Flow

Answer 9

coronary sinus pressure= 30-40

flow= 200 ml/min

Question 10

Direct Ostial Delivery Pressure and Flow

Answer 10

circuit pressure= 250-300 (high cuz small hole)

flow= 150-250 (normal CO 5-8%)

Question 11

Delivery through Graft

Answer 11

pressure= 50
flow= 50-100 ml/min

Question 12

KCl

Answer 12

diastolic arrest

Question 13

THAM/histadine

Answer 13

buffer

Question 14

Mannitol

Answer 14

osmolarity, free radical scavenger

Question 15

Aspartate/glutamate/glucose

Answer 15

metabolic substrate

Question 16

MgCl2

Answer 16

protects against Ca? homeostasis

Question 17

CPD

Answer 17

lowers Ca (decrease stone heart)

Question 18

Blood

Answer 18

oxygen carrier

Question 19

what does HTK stand for in custodial HTK

Answer 19

histamine, tryptophan, ketogluterate

Question 20

3 Phases of CPG

Answer 20

induction, maintenance, reperfusion