A 45-year-old woman experiences progressive deterioration several days after subarachnoid hemorrhage treated with clip ligation. The most likely cause is which condition?

A 45-year-old woman experiences progressive deterioration several days after subarachnoid hemorrhage treated with clip ligation. The most likely cause is which condition?

• A. Cerebral edema
• B. Hyponatremia
• C. Recurrent cerebral hemorrhage
• D. Vasospasm

Answer: (D)

Vasospasm after a subarachnoid hemorrhage is the phenomenon being tested. When blood from the bleed remains in the subarachnoid space, breakdown products such as oxyhemoglobin irritate and constrict the cerebral arteries. This tends to occur a few days after the hemorrhage—commonly about days 4 through 14—and leads to delayed cerebral ischemia. The new or worsening focal neurologic deficits or decreased level of consciousness during this window is characteristic, because parts of the brain become underperfused despite the initial control of the bleed. Cerebral edema tends to present earlier as brain swelling around the time of the hemorrhage and infection/inflammation context can worsen it, but the timing here points away from edema as the progressive deterioration several days later. Recurrent hemorrhage would typically cause a more abrupt deterioration soon after the procedure, not a delayed, progressive decline. Hyponatremia can cause confusion or seizures, but it usually does not produce the progressive focal neurologic deterioration seen with delayed cerebral ischemia from vasospasm. Thus, the most likely cause of deterioration days after clip ligation of SAH is vasospasm leading to delayed cerebral ischemia, and management focuses on preventing and treating this vasospasm to maintain cerebral perfusion.

Vasospasm after a subarachnoid hemorrhage is the phenomenon being tested. When blood from the bleed remains in the subarachnoid space, breakdown products such as oxyhemoglobin irritate and constrict the cerebral arteries. This tends to occur a few days after the hemorrhage—commonly about days 4 through 14—and leads to delayed cerebral ischemia. The new or worsening focal neurologic deficits or decreased level of consciousness during this window is characteristic, because parts of the brain become underperfused despite the initial control of the bleed.

Cerebral edema tends to present earlier as brain swelling around the time of the hemorrhage and infection/inflammation context can worsen it, but the timing here points away from edema as the progressive deterioration several days later. Recurrent hemorrhage would typically cause a more abrupt deterioration soon after the procedure, not a delayed, progressive decline. Hyponatremia can cause confusion or seizures, but it usually does not produce the progressive focal neurologic deterioration seen with delayed cerebral ischemia from vasospasm.

Thus, the most likely cause of deterioration days after clip ligation of SAH is vasospasm leading to delayed cerebral ischemia, and management focuses on preventing and treating this vasospasm to maintain cerebral perfusion.