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Neurosurgery›Condition·Updated Jul 11, 2026·v1

Subarachnoid Hemorrhage

Aneurysmal subarachnoid hemorrhage is a high-mortality neurosurgical emergency requiring rapid diagnosis with CT within 6 hours, urgent aneurysm securement (coiling or clipping within 48 hours), and dedicated neurocritical care. The dual threats of early rebleeding and delayed cerebral ischemia (DCI) guide management: nimodipine 60 mg PO q4h × 21 days is standard for DCI prevention; blood pressure control (sBP <160 mmHg), avoidance of hypocapnia, maintenance of Hb ≥9 g/dL, and ICP management (target <11 mmHg) are critical. Smoking cessation and blood pressure control are primary prevention cornerstones. Lifelong imaging surveillance is mandatory after treatment to detect de novo or recurrent aneurysms.

High Evidence250 references·10,129 words·41 min read·v1
NeurosurgerySubarachnoid HemorrhageAneurysmStrokeNeurologyCritical Care

Quick Reference

RxDrug of choiceNimodipine 60 mg PO q4h × 21 days (Class I, Level A) for DCI prevention.
AltAlternativesClazosentan 10-15 mg/h IV × ≤14 days (Japan-approved; reduces angiographic vasospasm but no functional benefit). Intra-arterial verapamil or nicardipine for acute vasospasm rescue. Tirofiban IV × 7 days (investigational for DCI reduction).
⊘AvoidNSAIDs (platelet inhibition), tranexamic acid (routine use, no net benefit), non-dihydropyridine CCBs (diltiazem, verapamil, may worsen vasospasm).
DxTest of choiceNoncontrast head CT within 6 hours of ictus (sensitivity ~100%); if negative and suspicion persists, LP for xanthochromia after 12 hours. CTA for aneurysm detection; DSA is gold standard if CTA negative.
ScKey scoreWFNS grade (prognosis), modified Fisher scale (DCI risk), Hijdra score (hydrocephalus risk).
→When to referAny suspected or confirmed SAH to a high-volume neurosurgical center (≥20 cases/year). Poor-grade (WFNS IV-V), complex or wide-necked aneurysms, refractory vasospasm, or need for advanced endovascular techniques.
Thunderclap headache → stat noncontrast CT within 6h → if positive, CTA → secure aneurysm <48h (coil or clip) → nimodipine 60 mg PO q4h × 21d → neurocritical care: avoid hypocapnia (PaCO₂ <35), maintain Hb ≥9 g/dL, monitor TCD for vasospasm, treat fever, manage hydrocephalus with LP or EVD. Smoking cessation is the single most impactful prevention strategy.
Subarachnoid hemorrhage (SAH) is a neurosurgical emergency defined by acute bleeding into the subarachnoid space, most commonly from a ruptured intracranial aneurysm. It carries a 35% mortality rate and leaves another third of survivors with permanent disability. The dual-phase threat, early rebleeding within hours and delayed cerebral ischemia (DCI) peaking at days 4-14, dictates the management strategy. Immediate noncontrast head CT (sensitivity ~100% within 6 hours), urgent aneurysm securement via coiling or clipping, and dedicated neurocritical care with nimodipine are the cornerstones of treatment. Modifiable risk factors (smoking, hypertension, heavy alcohol) drive incidence; smoking cessation and blood pressure control are the primary prevention priorities.

Overview and Recommendations

Background

  • •Subarachnoid hemorrhage (SAH) is the extravasation of blood into the subarachnoid space, most often from rupture of a saccular (berry) aneurysm at a circle-of-Willis branch point. With an age-standardized incidence of 1-2 per 100,000 person-years, it accounts for only 5% of all strokes but disproportionately contributes to years of potential life lost, roughly one-third of patients die, and another third are left with significant disability.
  • •The management paradigm recognizes SAH as a dual-phase disease: the first hours carry a 17% rebleeding risk before aneurysm treatment (aneurysm size >10 mm quadruples odds, OR 2.56), while the second week threatens delayed cerebral ischemia (DCI) in ~30% of patients. This pathophysiology, early brain injury from global ischemia and hemoglobin toxicity, followed by PD-1+ monocyte-mediated vasospasm and neuroinflammation, dictates a two-pronged approach: urgent aneurysm securement and aggressive neurocritical care.
  • •The four pillars of acute SAH management are: (1) rapid diagnosis with noncontrast CT within 6 hours of ictus, (2) CT angiography or digital subtraction angiography to identify the aneurysm, (3) early (<48 h) aneurysm obliteration by microsurgical clipping or endovascular coiling (with individualized modality selection based on aneurysm morphology, patient grade, and institutional expertise), and (4) dedicated neurocritical care targeting vasospasm prevention with nimodipine 60 mg PO q4h × 21 days, ICP control, avoidance of hypocapnia, and maintenance of hemoglobin ≥9 g/dL.
  • •Three modifiable risk factors dominate the epidemiology: current smoking (pooled RR 3.18), hypertension (RR 3.05), and heavy alcohol consumption ≥150 g/week (RR 2.46). Heritable conditions confer substantially higher risk, autosomal dominant polycystic kidney disease (ADPKD) carries a 12.6% prevalence of unruptured intracranial aneurysms and 4-5× the population rupture risk. First-degree relatives of aSAH patients also warrant screening, which has been consistently found cost-effective.
  • •Clinical severity is graded by the Hunt-Hess scale (I-V) and the World Federation of Neurosurgical Societies (WFNS) grade (I-V based on GCS and motor deficit), with WFNS grade being the most validated predictor of functional outcome. Radiological blood-load scales, the modified Fisher scale and the quantitative Hijdra score, independently predict DCI and shunt-dependent hydrocephalus risk; a Hijdra score ≥30 is the strongest single predictor of permanent CSF diversion.

Evaluation

  • •Suspect SAH in any patient with a thunderclap headache, maximal intensity within seconds to minutes, especially if accompanied by syncope (OR 5.7) or aggravation by physical activity (OR 18.6). Up to 30% report a sentinel headache in the preceding days to weeks from a minor leak.
  • •Ask about modifiable risk factors: current smoking, hypertension, heavy alcohol use, and illicit drugs (e.g., cocaine). Elicit family history of intracranial aneurysm or SAH, and known heritable conditions such as ADPKD, Ehlers-Danlos syndrome, or Moyamoya disease.
  • •Examine for nuchal rigidity (meningismus, may be absent in comatose patients), focal deficits (hemiparesis, aphasia), and cranial nerve palsies: a third nerve palsy (ptosis, mydriasis, down-and-out gaze) localizes to a posterior communicating artery aneurysm; a sixth nerve palsy suggests non-localizing raised ICP. Assess consciousness using GCS and assign a Hunt-Hess grade. Fundoscopy may reveal subhyaloid hemorrhages.
  • •Order a noncontrast head CT immediately, within 6 hours of symptom onset, sensitivity approaches 100% (pooled LR- 0.010). If CT is positive for SAH, proceed directly to CT angiography (CTA) to identify the aneurysm.
  • •If CT is negative (or equivocal) and clinical suspicion remains high, perform a lumbar puncture after 12 hours to detect xanthochromia, yellow supernatant from hemoglobin breakdown. A negative CT (within 6 h) and negative LP (no xanthochromia, normal RBC count) effectively excludes aneurysmal SAH.
  • •CTA has a pooled sensitivity of 91.2% (95% CI 82.2-95.8%) for aneurysm detection. In patients with a perimesencephalic pattern (blood confined to interpeduncular, prepontine, or ambient cisterns), a negative CTA has a negative predictive value of 99.0%, making digital subtraction angiography (DSA) unnecessary in most cases.
  • •In diffuse nonperimesencephalic SAH with negative initial CTA, DSA remains the gold standard. If initial CTA and DSA are both negative, schedule a repeat DSA at 1-6 weeks, this detects an aneurysm in 10.0% of cases (95% CI 7.4-13.6%).
  • •Grade the hemorrhage using the modified Fisher scale (grades 0-4) to predict DCI risk, and calculate the Hijdra score (sum of cisternal and ventricular blood) for quantitative risk stratification for hydrocephalus. Assign a WFNS grade based on GCS and motor deficit for prognostic stratification.
  • •Consider alternative diagnoses in the differential of thunderclap headache: perimesencephalic nonaneurysmal SAH (benign, excellent prognosis), cerebral venous sinus thrombosis, reversible cerebral vasoconstriction syndrome, pituitary apoplexy, spontaneous intracranial hypotension, and acute hypertensive crisis.
  • •Also note that admission hyperglycemia (glucose ≥9.3 mmol/L) triples the odds of poor outcome (OR 3.1). Out-of-hospital cardiac arrest carries only 4.9% favorable neurological recovery, and coexisting acute subdural hematoma (present in 1.8% of aneurysm SAH) halves the chance of favorable outcome to 34%.

Management

  • •Initiate blood pressure control before the aneurysm is secured: maintain systolic BP <160 mmHg using short-acting agents such as nicardipine (5-15 mg/h IV) or labetalol (10-20 mg IV q10-20min). A post hoc analysis of CONSCIOUS-1 suggests that a maximal sBP <118 mmHg may improve 3-month outcome (OR 0.28), but this threshold is not yet guideline-supported; avoid extremes.
  • •Administer nimodipine 60 mg orally every 4 hours for 21 days (Class I, Level A) to reduce the risk of poor neurological outcome from DCI. If oral administration is not possible, use IV nimodipine (1 mg/h, increasing to 2 mg/h) where available. Monitor for hypotension.
  • •Secure the aneurysm within 48 hours of ictus. Endovascular coiling is first-line for saccular aneurysms with a favorable dome-to-neck ratio (neck ≤4 mm or dome-to-neck ≥2). Microsurgical clipping remains essential for wide-necked, complex, or MCA bifurcation aneurysms, and when a large intraparenchymal hematoma requires evacuation. A modality-neutral individualized approach yields better outcomes than a rigid endovascular-first policy.
  • •For wide-necked or bifurcation aneurysms unsuitable for standalone coiling, consider stent-assisted coiling, flow diversion, or the Woven EndoBridge (WEB) device. These require dual antiplatelet therapy (DAPT), note that DAPT is associated with a 2-fold lower risk of angiographic vasospasm (aOR 0.47). Use periprocedural antiplatelet therapy (e.g., tirofiban IV) to reduce thromboembolic complications during coiling (OR 3.42).
  • •For acute hydrocephalus in patients with GCS ≥7 and no contraindications, consider therapeutic lumbar puncture (LP) as initial CSF diversion, a 2-center cohort found LP was associated with far fewer permanent shunts (10% vs 68%; aOR 0.04) and fewer complications (22% vs 38%) compared with upfront external ventricular drain (EVD). If EVD is used, apply rapid weaning (immediate clamping) to reduce hospital stay by a mean of 4.3 days without increasing shunt dependency.
  • •Monitor ICP and maintain cerebral perfusion pressure (CPP) >60 mmHg. The optimal mean ICP threshold is 11.08 mmHg; sustained ICP above this level triggers escalation: head-of-bed ≥30°, sedation, normocapnia (PaCO₂ 35-40 mmHg), and mannitol 0.25-1 g/kg IV or hypertonic saline (3%) boluses. For refractory ICP elevation, consider decompressive craniectomy, better outcomes when performed early (primary) than delayed (unfavorable outcome 47.5% vs 74.4%).
  • •Strictly avoid hypocapnia: even transient PaCO₂ <35 mmHg doubles the odds of poor neurological outcome (OR 2.09), this is one of the most modifiable perioperative factors.
  • •Maintain hemoglobin ≥9 g/dL during the vasospasm risk window. A liberal transfusion threshold (9-10 g/dL) probably reduces unfavorable neurological outcomes (39.6% vs 45.5% with restrictive 7-8 g/dL) and new cerebral ischemia (17.7% vs 22.9%), though it increases transfusion requirements and ICU length of stay.
  • •Surveille for DCI with daily transcranial Doppler (TCD) of the middle cerebral artery. Rising mean flow velocity (MFV-MCA) >200 cm/s or Lindegaard ratio >6 warrants escalation to CT angiography or DSA. TCD-directed patient selection for intra-arterial vasodilator therapy improves neurological response (64% vs 57%).
  • •For symptomatic vasospasm refractory to medical therapy, administer intra-arterial vasodilators such as verapamil (3-5 mg per hemisphere) or nicardipine (0.5-1 mg per artery). Balloon angioplasty is reserved for proximal, refractory vasospasm. Meta-analysis reports 89% immediate angiographic response and 57% neurological improvement with 5% adjusted mortality.
  • •Avoid routine use of tranexamic acid, the ULTRA trial showed no benefit in quality of life or functional outcome. Avoid NSAIDs because of platelet inhibition. Avoid non-dihydropyridine CCBs (diltiazem, verapamil), they exacerbate HF and may worsen vasospasm.
  • •Treat fever aggressively: temperature ≥38.5 °C occurs in 41-60% of patients and independently predicts worse functional outcome. Use antipyretics (acetaminophen 650 mg q4-6h) and targeted normothermia (surface cooling) if infectious causes are excluded.
  • •Initiate DVT prophylaxis 24 hours after aneurysm securing: enoxaparin 40 mg SC daily or UFH 5000 U SC q8h, combined with sequential compression devices.
  • •Do not use prophylactic antiepileptics routinely, early seizures occur in only 3.0% and late in-hospital seizures in 1.5%. If a seizure occurs, load levetiracetam (1000-3000 mg/day).
  • •Refer to a high-volume center (≥20-32 cases/year) for definitive management. Involve neurocritical care, neurointerventional radiology, and neurosurgery teams early. Discharge to rehabilitation when neurologically stable, vasospasm period has passed (after day 14), and hydrocephalus is managed. Arrange lifelong annual MRA surveillance for de novo aneurysm formation (0.35-0.52% per year) and growth of untreated aneurysms (2.48% per year).
  • •In elderly patients (≥80 years), vasospasm risk is 8-fold lower, allowing de-escalation of prophylactic TCD and hemodynamic therapy. Endovascular coiling is preferred but outcomes are similar to clipping; focus on early shunting for hydrocephalus.
  • •In pregnant patients with SAH, do not delay aneurysm treatment because of pregnancy. Endovascular coiling with abdominal shielding is preferred when feasible. Administer nimodipine 60 mg q4h (pregnancy category C, acceptable given DCI risk). If aneurysm is secured, vaginal delivery can be considered; if unsecured, elective cesarean at term is recommended.

Board Review — High Yield

  • •Thunderclap headache, sudden, severe headache peaking within seconds; strongest predictors are aggravation by physical activity (OR 18.6) and syncope (OR 5.7), not 'worst ever' alone.
  • •CT sensitivity, noncontrast head CT within 6 hours of ictus has ~100% sensitivity; after 12 hours, LP with xanthochromia is mandatory if CT negative.
  • •Nimodipine, the only neuroprotective agent with Class I, Level A evidence for improving outcomes after aSAH; reduce poor outcome from vasospasm.
  • •Rebleeding, occurs in 17% of patients before aneurysm treatment; aneurysm size >10 mm quadruples risk (OR 2.56).
  • •Delayed cerebral ischemia (DCI), affects ~30% of patients 3-14 days post-SAH; angiographic vasospasm is incompletely correlated with DCI; microvascular and inflammatory mechanisms are equally important.
  • •Hijdra score, quantitative sum of cisternal and ventricular blood; score ≥30 is the strongest predictor of shunt-dependent hydrocephalus.
  • •Clazosentan, reduces angiographic vasospasm (RR 0.54) and vasospasm-related DCI (RR 0.56) but does not improve functional outcome and increases adverse events (RR 1.54). Approved in Japan only.
  • •WFNS grade, most validated predictor of functional outcome; uses GCS and motor deficit.
  • •Smoking cessation, single most impactful modifiable prevention; current smokers have RR 3.18 for SAH.
  • •ADPKD, 12.6% prevalence of unruptured intracranial aneurysms; screening with contrast-free MRA is recommended with rescreening every 5-10 years if negative.

Deep Dive — Evidence Details

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