CCP CCP Temperature Management & Hypothermia 1 — Questions and Answers
Question 1: What is the target nasopharyngeal temperature for deep hypothermic circulatory arrest (DHCA) in adults?
- 28-30°C
- 20-25°C
- 15-18°C (Correct answer)
- 10-12°C
Correct answer: 15-18°C
DHCA typically targets nasopharyngeal temperatures of 15-18°C to provide adequate cerebral protection during circulatory arrest.
Question 2: Which temperature monitoring site most accurately reflects brain temperature during CPB cooling?
- Rectal
- Bladder
- Nasopharyngeal (Correct answer)
- Esophageal
Correct answer: Nasopharyngeal
Nasopharyngeal temperature closely approximates brain temperature during CPB due to its proximity to the internal carotid artery.
Question 3: What is the maximum safe rate of rewarming on CPB to avoid cerebral hyperthermia?
- 1°C per minute
- 0.5°C per minute (Correct answer)
- 2°C per minute
- No limit if gradual
Correct answer: 0.5°C per minute
Rewarming should not exceed 0.5°C per minute to prevent cerebral hyperthermia and associated neurological injury.
Question 4: During hypothermic CPB, what happens to whole-body oxygen consumption (VO2)?
- Increases proportionally with cooling
- Decreases approximately 50% for every 10°C drop (Correct answer)
- Remains unchanged
- Increases due to shivering
Correct answer: Decreases approximately 50% for every 10°C drop
VO2 decreases roughly 50% for every 10°C reduction in temperature, following the Q10 metabolic effect.
Question 5: Moderate hypothermia during CPB is defined as which core temperature range?
- 32-37°C
- 28-32°C (Correct answer)
- 20-28°C
- Below 20°C
Correct answer: 28-32°C
Moderate hypothermia is defined as core temperatures between 28-32°C during cardiopulmonary bypass.
Question 6: Which complication is most associated with overly rapid rewarming from deep hypothermia?
- Coagulopathy
- Cerebral hyperthermia and neurological injury (Correct answer)
- Pulmonary edema
- Ventricular fibrillation
Correct answer: Cerebral hyperthermia and neurological injury
Rapid rewarming causes cerebral hyperthermia where increased metabolic demand outpaces oxygen delivery, leading to neurological injury.
CCP CCP Temperature Management & Hypothermia 1
What is the target nasopharyngeal temperature for deep hypothermic circulatory arrest (DHCA) in adults?