Management of Subarachnoid and Subdural Hemorrhage

Diagnostic Approach

Non-contrast head CT is the cornerstone of diagnosis for subarachnoid hemorrhage (SAH), with sensitivity approaching 100% within the first 3 days after onset, decreasing to 93% at 24 hours and 57-85% by day 6 1, 2
If CT is negative but clinical suspicion remains high, lumbar puncture for xanthochromia evaluation is necessary, especially in patients presenting >6 hours from symptom onset 3, 4
Digital subtraction angiography (DSA) is indicated for patients with confirmed SAH to identify the source of bleeding, typically an aneurysm 5, 4
Non-contrast head CT is the primary diagnostic tool for subdural hematomas 6

Immediate transfer to a high-volume center (>35 SAH cases per year) with multidisciplinary neurointensive care services is recommended for subarachnoid hemorrhage patients 5, 7
Blood pressure control is essential to reduce the risk of rebleeding while maintaining cerebral perfusion in subarachnoid hemorrhage patients 7, 8
Oral nimodipine 60 mg every 4 hours for 21 consecutive days should be administered to improve neurological outcomes by reducing the incidence and severity of ischemic deficits in subarachnoid hemorrhage patients 7, 8
Acute symptomatic hydrocephalus should be managed by cerebrospinal fluid diversion via external ventricular drainage or lumbar drainage in subarachnoid hemorrhage patients 9, 7

Early securing of the ruptured aneurysm (within 24-72 hours) is recommended to prevent rebleeding in subarachnoid hemorrhage patients 9, 8
For aneurysms amenable to both techniques, endovascular coiling is generally preferred over surgical clipping, especially for posterior circulation aneurysms 9, 7
Complete obliteration of the aneurysm should be the goal whenever possible in subarachnoid hemorrhage patients 9, 8

Delayed cerebral ischemia (DCI) prevention is a major focus in subarachnoid hemorrhage management, with nimodipine administration being the cornerstone of management 7
Maintenance of euvolemia rather than hypervolemia is recommended to prevent DCI in subarachnoid hemorrhage patients 7
For patients who develop symptomatic DCI, induced hypertension is recommended unless contraindicated 9, 8
Seizure prophylaxis should be considered, as seizures occur in up to 20% of patients after SAH, most commonly in the first 24 hours 1, 2

Delayed follow-up vascular imaging is necessary to identify aneurysm remnants or recurrence in subarachnoid hemorrhage patients 9, 8
Comprehensive evaluation including cognitive, behavioral, and psychosocial assessments is recommended after discharge for subarachnoid hemorrhage patients 9, 7
Multidisciplinary rehabilitation approach should be implemented to address physical, cognitive, and behavioral deficits in subarachnoid hemorrhage patients 7

Misdiagnosis of SAH occurs in up to 12% of cases, with the most common error being failure to obtain a non-contrast cranial CT 2
The Ottawa SAH Rule can help identify patients at low risk for SAH, but has low specificity (7.6-15.3%) 3, 4
Delayed diagnosis of a sentinel bleed in SAH can lead to catastrophic outcomes, necessitating high clinical suspicion for warning leaks 2