CCP Temperature Management & Hypothermia Flashcards
6 cards from real CCP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CCP Temperature Management & Hypothermia flashcards as text
What is the maximum recommended temperature gradient between heat exchanger water and blood during rewarming?
Answer: 10°C
A gradient exceeding 10°C between heat exchanger water and blood can cause dissolved gases to come out of solution and form emboli.
Which organ is most sensitive to hyperthermia during cardiac surgery?
Answer: Brain
The brain is most vulnerable to hyperthermia due to its high metabolic rate and limited tolerance for temperature-induced ischemic injury.
Cerebral metabolic rate for oxygen (CMRO2) at 18°C compared to 37°C is approximately:
Answer: 10% of normal
At 18°C, CMRO2 is approximately 10% of normal, providing the dramatic metabolic suppression required for safe DHCA.
Which cerebral protection adjunct is commonly administered during DHCA to further reduce CMRO2?
Answer: Thiopental or other barbiturates
Barbiturates such as thiopental cause EEG burst suppression, further reducing CMRO2 as a neuroprotective adjunct during DHCA.
The generally accepted safe duration of circulatory arrest at 18°C before significant neurological risk increases is:
Answer: 40-45 minutes
At 18°C, circulatory arrest is considered safe for up to 40-45 minutes before the risk of neurological injury increases significantly.
Hemodilution during hypothermic CPB is beneficial primarily because it:
Answer: Reduces blood viscosity which rises markedly at low temperatures
Blood viscosity increases significantly at hypothermic temperatures, and hemodilution counteracts this to maintain adequate microcirculatory perfusion.