Autonomic Dysreflexia at T5: A Pressure Emergency
J. R. is a 34-year-old man with a T5 ASIA A spinal cord injury from a motorcycle crash eight weeks ago, now on an inpatient rehabilitation unit. His baseline blood pressure is 104/62 mmHg with a heart rate of 68. At 14:10 he reports a sudden pounding headache and blurred vision. He is diaphoretic and flushed above the nipple line, with piloerection on his chest and arms. Blood pressure is 182/106 mmHg, heart rate 46, respirations 20, SpO2 97% on room air. The rehabilitation aide mentions he was scheduled for a bladder scan because the indwelling catheter has drained only 40 mL since 08:00. His bowel program was completed that morning, and he ate lunch in his wheelchair. He has no history of hypertension or migraine and takes no antihypertensive medication. The unit's dysreflexia protocol is at the desk, and the covering physician is in another building.
1. What is your first nursing action, and what is the rationale for it?
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Sit him upright immediately (high-Fowler's, at least 90 degrees), lower his legs if the bed or chair allows, and loosen any tight clothing or straps. Rationale: the danger in autonomic dysreflexia is the hypertensive crisis, not the position; upright posture produces venous pooling and can begin lowering BP within minutes while you hunt for the stimulus. Recheck BP and stay with him. Do not leave him supine, which worsens the BP. At the same time, inspect the catheter tubing for kinks, dependent loops, or a full drainage bag and perform the bladder scan; bladder distension is the most common trigger. His bradycardia (46) is a baroreceptor-mediated vagal response to the hypertension, not a primary problem, so atropine is not the answer. Definitive treatment is removing the noxious stimulus; antihypertensives are rescue measures used while that search proceeds.
2. List the noxious stimuli you would assess, in order of likelihood, and describe what you would do if the catheter appears blocked.
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Work from the most common to the least: bladder (distension, blocked catheter, UTI, stones), bowel (impaction, constipation, rectal stimulation), skin (pressure injury, tight clothing, wrinkles in the bed, restraints), musculoskeletal (fracture, ingrown toenail, DVT), and visceral (appendicitis, gastric ulcer, labor). For a non-draining catheter, check for kinks and dependent loops; if the scan shows significant retained volume, follow protocol, which often means irrigation and, if needed, catheter replacement using 2% lidocaine jelly to anesthetize the urethra and prevent further stimulation. Do not forcibly milk or flush without assessing. Because his bowel program was completed this morning, the bladder is the most likely trigger. Reassess BP after each intervention; removing the trigger usually resolves the episode within minutes.
3. His BP is now 190/110 mmHg and has not responded to your initial measures. What do you do now, what do you avoid, and what do you document?
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This is a medical emergency. Keep him upright, stay with him, and repeat BP every 2 to 5 minutes. Activate the dysreflexia protocol and notify the covering physician now rather than waiting for rounds. Request a rapidly acting agent per protocol or prescriber order (for example immediate-release nifedipine or nitroglycerin paste) while continuing to search for and remove the trigger. Avoid leaving him alone or flat, and avoid giving a beta-blocker alone, because unopposed alpha stimulation can worsen the hypertension. Never let an antihypertensive substitute for finding the cause. Document baseline and serial BPs, heart rate, symptoms, suspected trigger, every intervention with the response, and who was notified and when. Afterwards, teach him to recognize early symptoms (headache, sweating, goosebumps) and to check catheter and bowels first.