In autonomic dysreflexia, a common precipitating factor is bladder distention.

Prepare for the Adult-Gerontology Acute Care Nurse Practitioner Test. Study with interactive quizzes and detailed explanations. Boost your exam readiness with our diverse question formats and in-depth content coverage.

In autonomic dysreflexia, a strong, unchecked sympathetic response below a high spinal cord injury (above about T6) is triggered by a noxious or nonnoxious stimulus. Bladder distention is one of the most common triggers because a full, blocked, or irritated bladder provides a potent afferent signal that cannot be regulated downward due to the injury. This input leads to widespread vasoconstriction below the level of the lesion, causing a sudden rise in blood pressure. The paraysympathetic response that can occur above the injury may produce bradycardia and flushing, but it cannot fully counteract the profound vasoconstriction below the injury.

Therefore, recognizing bladder distention as a common precipitant is essential because the urgent first step is to relieve that distention—check for catheter obstruction, kink, or urinary retention and drain the bladder. After addressing the bladder, reassess blood pressure and treat as needed, while also evaluating other potential triggers such as bowel distention or tight clothing. This explains why bladder distention is a frequent and critical precipitant in this condition.