A client is receiving care in the critical care unit following a closed head injury. The nurse is continuously monitoring the client's neurological status and physiological adaptation. Which of the following assessment findings strongly indicate that the client is losing compensatory auto-regulation and developing critically elevated intracranial pressure? Select all that apply.
- A systolic blood pressure that progressively increases while the diastolic pressure remains unchangedCevap
- A heart rate that steadily drops from 86 to 48 beats per minute over a one-hour periodCevap
- Rhythmic respiratory patterns alternating between deep, rapid breathing and periods of apneaCevap
- DA sustained heart rate of 118 beats per minute accompanied by a narrow pulse pressure of 20 mm Hg
- EArterial blood gas analysis demonstrating a pH of 7.49 and a PaCO2 of 29 mm Hg
Cevap
The correct findings that indicate critically elevated intracranial pressure are an increasing systolic blood pressure with stable diastolic pressure (widening pulse pressure), a steadily dropping heart rate (bradycardia), and rhythmic respiratory patterns alternating with apnea (Cheyne-Stokes respirations).
When a client with a head injury loses compensatory auto-regulation, intracranial pressure rises dangerously and compresses the brainstem. This triggers a specific set of late physiological responses known as Cushing's triad. Cushing's triad consists of severe hypertension with a widening pulse pressure (the systolic pressure increases while the diastolic pressure remains relatively stable), marked bradycardia (a significant drop in heart rate), and irregular respiratory patterns (such as Cheyne-Stokes respirations, characterized by alternating periods of deep breathing and apnea). These assessment findings indicate impending brain herniation and require immediate life-saving intervention.
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Cushing's Triad and the Pathophysiology of Increased Intracranial Pressure