TCRN Practice Exam 2026 – Complete Prep for Your Test

Question: 1 / 400

What is a common consequence of a cerebral perfusion pressure below 70 mmHg?

Enhanced oxygen delivery to the brain

Decreased risk of secondary brain injury

Poor oxygen perfusion to the brain

A cerebral perfusion pressure (CPP) below 70 mmHg is indicative of insufficient blood flow to the brain, which can lead to poor oxygen perfusion. The brain relies on adequate blood flow to deliver oxygen and nutrients necessary for its proper function. When CPP falls below this threshold, it can compromise the brain's ability to maintain homeostasis, oxygenation, and effectively remove metabolic wastes. This can result in cellular injury and, if prolonged, may lead to irreversible damage and neurological deficits.

In contrast, enhanced oxygen delivery, decreased risk of secondary brain injury, and improvements in neurological function cannot occur under these conditions, as they require an adequate CPP to ensure proper cerebral blood flow and oxygen supply. Thus, recognizing the implications of low cerebral perfusion pressure is critical for understanding the risks associated with brain injuries and their management.

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Improvement in neurological function

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