CCP CCP Temperature Management & Hypothermia 2

Question 1

What is the primary advantage of alpha-stat blood gas management during hypothermic CPB?

Accepted Answer

Preserves cerebrovascular autoregulation and enzyme function

Answer

Alpha-stat management preserves cerebrovascular autoregulation and intracellular enzyme function by maintaining temperature-uncorrected pH values.

Question 2

pH-stat blood gas management during hypothermia results in which primary cerebral effect?

Accepted Answer

Increased cerebral blood flow due to elevated CO2

Answer

pH-stat management adds CO2 to maintain pH 7.40 at actual body temperature, causing cerebral vasodilation and increased cerebral blood flow.

Question 3

Which pH management strategy is preferred for neonates and infants undergoing DHCA?

Accepted Answer

pH-stat

Answer

pH-stat is preferred in neonates and infants because increased cerebral blood flow improves uniform brain cooling before circulatory arrest.

Question 4

The 'afterdrop' phenomenon after CPB rewarming refers to:

Accepted Answer

Continued fall in core temperature after rewarming is stopped

Answer

Afterdrop is the continued decrease in core temperature after active rewarming stops, caused by cold blood returning from peripheral tissues.

Question 5

During normothermic CPB, what core temperature range is targeted?

Accepted Answer

35-37°C

Answer

Normothermic CPB targets core temperatures of 35-37°C to maintain near-physiologic metabolic conditions throughout the procedure.

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