A nurse is caring for a client with a complete C7 spinal cord injury who was admitted 3 days ago. The client suddenly develops severe hypertension (BP 190/105 mmHg), bradycardia (HR 52 bpm), profuse diaphoresis above the level of injury, and reports a severe pounding headache. What is the nurse's immediate priority action?

This clinical presentation is a classic case of autonomic dysreflexia (AD), a life-threatening emergency unique to patients with spinal cord injuries at or above the T6 level. The client's complete C7 spinal cord injury places them well within the risk zone. AD is triggered by a noxious stimulus below the level of injury, most commonly a distended bladder or impacted bowel. The pathophysiology involves an exaggerated sympathetic response: the stimulus sends afferent signals up the spinal cord, but because the injury blocks descending inhibitory signals from the brain, the sympathetic nervous system below the injury goes into overdrive. This causes severe vasoconstriction, leading to the paroxysmal hypertension documented in the case report by Tang et al. ^[1]. The body's compensatory mechanism, mediated by the baroreceptors and the intact vagus nerve, attempts to lower the heart rate, resulting in the observed bradycardia (HR 52 bpm) and vasodilation above the injury level, which manifests as profuse diaphoresis, flushing, and a pounding headache ^[1].

The nurse's immediate priority is not to treat the symptom (hypertension) but to find and remove the underlying cause. The severe hypertension in AD is a direct consequence of the noxious stimulus; administering an antihypertensive medication without removing the stimulus can lead to a dangerous, rapid drop in blood pressure once the stimulus is removed. The most common trigger in the acute post-injury phase is bladder distention due to a kinked or blocked urinary catheter, as highlighted in the management of a patient with a high-level SCI and neurogenic bladder ^[2]. Therefore, the first and most critical nursing action is to check for bladder distention and catheter patency immediately.

Option 2 (Administer prescribed antihypertensive medication): This is a secondary intervention. While rapid-onset, short-acting antihypertensives may be part of the protocol if the hypertension persists after removing the stimulus, it is not the immediate priority. Treating the hypertension without removing the trigger is ineffective and potentially dangerous, as the paroxysmal hypertension is a symptom, not the root cause ^[1].

Option 3 (Place the client in Trendelenburg position): This is contraindicated. The immediate action for a patient experiencing AD is to elevate the head of the bed to a high Fowler's position and dangle the legs if possible. This orthostatic maneuver helps to pool blood in the lower extremities, promoting a rapid, non-pharmacological reduction in blood pressure and reducing intracranial pressure. Placing the client flat would worsen the hypertension and the risk of a cerebral hemorrhage ^[1].

Option 4 (Apply oxygen via nasal cannula at 2 L/min): While the patient is in distress, the immediate threat is a hypertensive crisis that can lead to stroke, seizure, or death. Applying oxygen addresses a potential secondary issue but does nothing to resolve the life-threatening hypertension. The primary survey in this scenario is directed at identifying and eliminating the noxious stimulus causing the AD episode.