Final answer:
Prolonged thoracic aortic cross-clamp time can result in a loss of cerebral perfusion.
Step-by-step explanation:
Prolonged thoracic aortic cross-clamp time is most likely to result in a loss of:
The correct answer is d) Cerebral perfusion.
When the thoracic aorta is cross-clamped for a prolonged period, blood flow to the brain is compromised, leading to a decrease in cerebral perfusion. This can result in neurological deficits and potentially permanent brain damage.