Initial Management of Subarachnoid Hemorrhage

Immediate Stabilization and Transfer

The American Heart Association recommends transferring patients to a high-volume center with neurosurgical and endovascular capabilities, as low-volume hospitals should transfer to high-volume centers with multidisciplinary neuro-intensive care services 3, 4
Assess neurological status using validated scales, such as the Hunt and Hess or World Federation of Neurological Surgeons grade, as this is the most useful indicator of outcome 3

The American College of Cardiology recommends controlling hypertension carefully using titratable agents to balance the competing risks of rebleeding versus maintaining adequate cerebral perfusion pressure 3
Target systolic blood pressure <160 mmHg, as values above this threshold are associated with increased rebleeding risk 4
Avoid aggressive blood pressure reduction that could compromise cerebral perfusion in the setting of elevated intracranial pressure 1

Administer oral nimodipine 60 mg every 4 hours immediately and continue for 21 consecutive days, as recommended by the American Heart Association 3

Proceed immediately with CT angiography (CTA) to identify the bleeding source, as CTA has 96.5% sensitivity and 88% specificity for aneurysms overall 4
If CTA is negative but SAH is confirmed, perform digital subtraction angiography (DSA) with 3D rotational angiography, which has >98% sensitivity and specificity for detecting aneurysms 4
Be aware that CTA has limited sensitivity (61%) for aneurysms <3 mm, necessitating DSA in cases with diffuse SAH pattern but negative CTA 1, 4

Secure the aneurysm within 24 hours of presentation to reduce rebleeding risk, which carries 70-90% mortality, as recommended by the American Heart Association 1, 2, 4
For aneurysms amenable to both clipping and coiling, endovascular coiling should be considered first based on randomized trial data showing better outcomes 3
Posterior circulation aneurysms particularly benefit from coiling over clipping (RR 0.41 for death or dependency) 2
Complete obliteration of the aneurysm is the goal whenever technically feasible to prevent rebleeding 2, 3

Monitor for acute hydrocephalus, which should be managed with cerebrospinal fluid drainage (external ventricular drain or lumbar drain), as recommended by the Neurocritical Care Society 3
Maintain euvolemia and normal circulating blood volume to prevent delayed cerebral ischemia (DCI) 3

Do not delay aneurysm treatment beyond 72 hours unless there are compelling contraindications, as the risk of rebleeding remains elevated throughout the first two weeks 2
Do not use prophylactic hypervolemia or triple-H therapy, as this is no longer recommended; maintain euvolemia instead 3
Do not use antifibrinolytic agents routinely in the pre-treatment period without careful consideration of risks versus benefits 1
In patients with large intracerebral hematoma causing mass effect, emergency surgical evacuation may be needed before or concurrent with aneurysm repair 2