You are the RN working in the ICU. One of your patients has an order for continuous intracranial pressure monitoring. When you go into the patient's room and do your shift assessment, the transducer of the ventriculostomy drain is placed at the level of the tragus of the ear. What should you do given this finding?

nothing, this is the correct placement of the transducer

elevate the patient's head of bed to 30 degrees

adjust the level of the transducer as it is in the wrong position

notify the health care provider immediately

Answer and Explanation

The Correct Answer is A

A. Nothing, this is the correct placement of the transducer is correct because for accurate intracranial pressure (ICP) measurement, the transducer of a ventriculostomy or ICP monitoring system should be aligned at the level of the foramen of Monro, which is approximated by the tragus of the ear when the patient is supine. Proper leveling ensures accurate pressure readings relative to the brain’s ventricles.

B. Elevate the patient's head of bed to 30 degrees is incorrect because while elevating the head of the bed can help reduce ICP, it does not address the specific question about transducer placement. ICP readings can remain accurate as long as the transducer stays aligned with the tragus, regardless of the patient’s head-of-bed position (within recommended ranges).

C. Adjust the level of the transducer as it is in the wrong position is incorrect because the transducer is already in the correct anatomical reference position. No adjustment is needed. Improper adjustments could actually introduce errors in the readings.

D. Notify the health care provider immediately is incorrect because this is a routine setup and does not represent a complication or unsafe condition. Notification is not required if the transducer is correctly leveled at the tragus.

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Correct Answer is C

Explanation

A. Normal ICP is incorrect because normal intracranial pressure ranges from 5 to 15 mmHgin adults. Values above 20 mmHg are considered elevated, and sustained ICP above 20–25 mmHg is critically highand requires urgent intervention.

B. Mildly elevated ICP is incorrect because ICP of 28 mmHg exceeds mild elevation, which is generally considered 20–25 mmHg. This patient’s ICP is above that range and represents a dangerous level.

C. Critically elevated ICP is correct. An ICP of 28 mmHg indicates critically elevated intracranial pressure, especially when accompanied by low CPP (normal 60–70 mmHg)and hypercapnia (PaCO2 60 mmHg). Hypercapnia causes cerebral vasodilation, further increasing ICP and worsening cerebral perfusion. Immediate interventions are required to reduce ICP, optimize CPP, and prevent secondary brain injury.

A. Patient is likely having a brain herniation B. Patient is likely having an ischemic stroke C. Patient is severely dehydrated D. Patient has uncontrolled hypertension

Correct Answer is A

Explanation

A. Patient is likely having a brain herniation is correct because the combination of sudden unilateral pupillary dilation, hypertension, bradycardia, and abnormal respirationsin the context of a large subdural hematoma and midline shift is indicative of increased intracranial pressure (IICP) leading to brain herniation. This is a neurological emergency. The fixed and dilated pupil suggests pressure on the oculomotor nerve (cranial nerve III) due to uncal herniation. The vital signs reflect Cushing’s triad: hypertension (widened pulse pressure), bradycardia, and irregular respirations, which are compensatory mechanisms to maintain cerebral perfusion. Immediate intervention is critical to prevent death.

B. Patient is likely having an ischemic stroke is incorrect because while ischemic strokes can cause neurological deficits, they do not typically produce the acute pupillary changes, midline shift, and Cushing’s triadseen in this patient. Additionally, the history of trauma and large subdural hematoma supports herniation rather than primary stroke.

C. Patient is severely dehydrated is incorrect because dehydration would typically cause tachycardia and hypotension, not bradycardia and hypertension. Dehydration also would not cause pupillary dilation or midline shift on imaging.

D. Patient has uncontrolled hypertension is incorrect because although the patient is hypertensive, the acute neurological signs (fixed dilated pupil, GCS 7, midline shift) are secondary to IICP and herniation, not primary hypertension. The elevated BP is part of Cushing’s response, not the underlying cause.

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Naxlex Comprehensive Predictor Exams

A nurse is caring for a patient with severe TBI receiving mechanical ventilation. ICP is 28 mmHg.CPP (cerebral perfusion pressure) is 55 mmHg. The patient's PaCO2, is 60 mmHg.

Correct Answer is C

Explanation

Correct Answer is A

Explanation

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Which of the following findings in your assessment would be the most reliable way to determine your patient's neurological status?

Which of the following findings in a patient with increased ICP signals brainstem compression and impending death?

A nurse is caring for a patient with severe TBI receiving mechanical ventilation, ICP is 28 mmHg, CPP (cerebral perfusion pressure) is 55 mmHg. The patient's PaCO, is 60 mmHg The PaCO2, level will likely cause: