Which of the following is a priority nursing intervention to prevent infection in this patient with AKI?

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.

A. Irregular respirations is incorrect because irregular or abnormal breathing patterns, such as Cheyne-Stokes or ataxic respirations, are part of Cushing’s triad. These occur due to pressure on the brainstem and impaired respiratory control.

B. Fever is correct because fever is not a component of Cushing’s triad. While fever may occur in neurological injury due to hypothalamic dysfunction or infection, it is not a defining feature of the triad. Including fever as part of the triad would be incorrect.

C. Bradycardia is incorrect because a slowed heart rateis a classic component of Cushing’s triad. It develops as a compensatory response to increased intracranial pressure and rising systolic blood pressure.

D. Increased systolic blood pressure is incorrect because hypertension with widened pulse pressureis another hallmark of Cushing’s triad. This occurs as a compensatory mechanism to maintain cerebral perfusion in the setting of elevated ICP.