Adult Critical Care Specialty (ACCS) Practice Exam

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What is the normal range for cerebral perfusion pressure?

30 - 50 mmHg
50 - 70 mmHg
60 - 100 mmHg
120 - 140 mmHg

The correct answer is: 60 - 100 mmHg

Cerebral perfusion pressure (CPP) is a critical measure in assessing the adequacy of blood flow to the brain. It is defined as the difference between the mean arterial pressure (MAP) and the intracranial pressure (ICP). A CPP within the normal range is essential to maintain cerebral metabolism and to prevent cerebral ischemia. The normal range for CPP is generally considered to be between 60 and 100 mmHg. This range ensures that there is sufficient pressure to drive blood flow into the brain, satisfying its metabolic needs. Maintaining CPP within this range helps to prevent complications such as brain tissue hypoxia and potential neurological deficits. Values below 60 mmHg can indicate insufficient blood flow, leading to potential ischemic injury, while values above 100 mmHg, especially if significantly elevated, can increase the risk of cerebral edema or hemorrhage due to high pressure within the cranial cavity. In the context of this question, identifying the normal range for CPP is crucial for healthcare providers in critical care settings, who must monitor and manage patients at risk for conditions affecting intracranial pressure and cerebral blood flow.