vasospasm
Pronunciation: VAY-so-spazm
Abnormal constriction of arterial vessels, commonly occurring after subarachnoid hemorrhage. Requires serial imaging to monitor progression and response to treatment.
Full Definition
Vasospasm refers to the abnormal and sustained constriction of arterial vessels, most commonly encountered in the cerebral circulation following aneurysmal subarachnoid hemorrhage. The condition typically develops 3-14 days after the initial bleeding episode and can lead to delayed cerebral ischemia. Imaging assessment includes conventional angiography, CT angiography, or transcranial Doppler ultrasound to evaluate vessel caliber and flow velocities. Vasospasm severity is often graded as mild (≤25% narrowing), moderate (26-50% narrowing), or severe (>50% narrowing). The condition may also occur in other vascular beds including coronary and peripheral arteries, particularly in the setting of catheter manipulation or contrast administration.
Usage
Usage note: One word, not hyphenated. Distinguish from vasodilation (opposite condition).
In Context
- "Follow-up angiography demonstrated severe vasospasm in the anterior cerebral artery distribution." — Neuroradiology report