Acute Stroke Management — Part 4: Intracerebral Hemorrhage

ICH pathophysiology, ICH Score, hematoma expansion, blood pressure management (INTERACT2, ATACH-2), anticoagulant reversal protocols, surgical intervention criteria (STICH, MISTIE III, ENRICH), and ICP management.

guidelinesMar 2026guidelines

1. Intracerebral Hemorrhage — Overview

Spontaneous (non-traumatic) intracerebral hemorrhage (ICH) accounts for approximately 10-15% of all strokes and carries the highest acute mortality rate of any stroke subtype. Approximately 30-50% of patients die within 30 days, and only 20% of survivors are functionally independent at 6 months. ICH represents a true medical emergency, with early hematoma expansion occurring in up to 30% of patients within the first few hours, a process that is strongly associated with clinical deterioration and death.1 2


2. Etiology and Risk Factors

2.1 Primary Etiologies

EtiologyProportionTypical LocationRisk Factors
Hypertensive arteriopathy~55-65%Deep structures: basal ganglia, thalamus, pons, cerebellumChronic hypertension; lipohyalinosis and microaneurysms of small perforating arteries
Cerebral amyloid angiopathy (CAA)~15-20%Lobar (cortical/subcortical); may be multifocal or recurrentAge > 65; APOE ε2 and ε4 alleles; associated with lobar microbleeds on MRI
Anticoagulant-related~10-15%Any locationWarfarin (risk increases sharply with INR > 3.0); DOACs (lower risk than warfarin); heparin
Structural lesions~5-10%VariableArteriovenous malformations, cavernous malformations, dural AV fistulas, aneurysms, tumors
Other~5%VariableCoagulopathy, vasculitis, moyamoya, sympathomimetic drugs (cocaine, amphetamines), hemorrhagic transformation of ischemic stroke

2.2 Key Risk Factors

Risk FactorRelative Risk
Hypertension (uncontrolled)3-5×
Anticoagulant therapy7-10× (warfarin); 2-3× (DOACs)
Heavy alcohol use (> 2 drinks/day)2-4×
Cerebral amyloid angiopathy5-10× for lobar ICH
Prior stroke (ischemic or hemorrhagic)2-3×
Dual antiplatelet therapy1.5-2×
Cocaine/amphetamine use5-6×
Liver disease / coagulopathyVariable
Cerebral microbleeds (≥ 5 on MRI)2-5×

3. ICH Score — Prognostic Grading

The ICH Score is the most widely used and validated grading scale for predicting 30-day mortality after spontaneous ICH. It was developed by Hemphill and colleagues and validated in multiple cohorts.3

3.1 Complete ICH Score Table

ComponentCriteriaPoints
Glasgow Coma Scale (GCS)13-150
5-121
3-42
ICH volume< 30 mL0
≥ 30 mL1
Intraventricular hemorrhage (IVH)No0
Yes1
Infratentorial originNo0
Yes1
Age< 80 years0
≥ 80 years1

Total score range: 0-6

3.2 ICH Score and 30-Day Mortality

ICH Score30-Day Mortality
00%
113%
226%
372%
497%
5100%
6100%

3.3 ICH Volume Estimation — ABC/2 Method

ICH volume can be rapidly estimated on CT using the ABC/2 formula:4

Volume (mL) = (A × B × C) / 2

Where:

  • A = greatest diameter of hemorrhage on the axial CT slice with the largest hemorrhage (cm)
  • B = diameter perpendicular to A on the same slice (cm)
  • C = number of CT slices with hemorrhage × slice thickness (cm) — or approximate craniocaudal extent

This simplified formula approximates the hemorrhage as an ellipsoid and provides a clinically useful estimate within minutes.

3.4 Important Caveats About the ICH Score

  • The ICH Score was developed as a prognostic tool, NOT a treatment-decision tool
  • Self-fulfilling prophecy risk: If clinicians use the ICH Score to justify withdrawal of care, the high mortality rates become self-reinforcing. The 2022 guidelines from the major cardiovascular and stroke professional societies explicitly warn against early limitation of aggressive care based solely on prognostic scores.1
  • Recommendation: Full aggressive medical and surgical management should be provided for at least 24-72 hours before any discussion of care limitation, unless the patient has a valid advance directive or the clinical situation is clearly non-survivable
  • No prognostic score should be used in isolation to limit treatment

4. Blood Pressure Management in ICH

Acute blood pressure management is one of the most important early interventions in ICH. The rationale is to reduce the rate of hematoma expansion, which occurs in up to 30% of patients within 6 hours and is a major driver of mortality and poor outcomes.1 5 6

4.1 Key Trials

INTERACT2 (Intensive Blood Pressure Reduction in Acute Cerebral Haemorrhage Trial 2)

ParameterDetails
DesignInternational RCT; n = 2,839
PopulationSpontaneous ICH within 6 hours; SBP 150-220 mmHg
InterventionIntensive SBP target < 140 mmHg (within 1 hour) vs standard target < 180 mmHg
Primary outcomeDeath or major disability at 90 days: 52.0% (intensive) vs 55.6% (standard); OR 0.87 (95% CI 0.75-1.01; p = 0.06) — did not reach significance for primary endpoint
Ordinal analysisSignificant shift toward better outcomes across the entire mRS distribution (OR 0.87, p = 0.04)
SafetyNo significant increase in adverse events with intensive lowering
ConclusionIntensive BP lowering to SBP < 140 mmHg is safe and may improve functional outcomes; adopted as standard of care5

ATACH-2 (Antihypertensive Treatment of Acute Cerebral Hemorrhage 2)

ParameterDetails
DesignInternational RCT; n = 1,000
PopulationSpontaneous ICH within 4.5 hours; SBP ≥ 180 mmHg; ICH volume < 60 mL
InterventionIntensive SBP target 110-139 mmHg vs standard SBP target 140-179 mmHg
AntihypertensiveIV nicardipine in both groups
Primary outcomeDeath or disability (mRS 4-6) at 90 days: 38.7% (intensive) vs 37.7% (standard); RR 1.04 (95% CI 0.85-1.27; p = 0.72) — no difference
Hematoma expansionNo significant difference between groups
SafetyRenal adverse events significantly higher in intensive group (9.0% vs 4.0%; p = 0.002)
ConclusionAchieving SBP < 140 is safe and reasonable (consistent with INTERACT2), but targeting SBP < 120-130 provides no additional benefit and may cause harm (renal injury)6

4.2 Current Blood Pressure Recommendations

Presenting SBPTargetTimingAgent
150-220 mmHg< 140 mmHgWithin 1 hour of presentation; maintain for at least 24 hoursNicardipine infusion (preferred) or labetalol or clevidipine
> 220 mmHgReduce cautiously; avoid sustained SBP < 130 mmHgGradual reduction; avoid precipitous dropsNicardipine infusion or clevidipine; may require multiple agents
< 150 mmHgMonitor; generally no acute intervention

4.3 Practical BP Management Protocol for ICH

StepAction
1Obtain baseline SBP; if > 150 mmHg, initiate treatment immediately
2First-line: Nicardipine 5 mg/h IV infusion; titrate by 2.5 mg/h every 5-15 minutes; max 15 mg/h
3Alternative: Labetalol 10-20 mg IV push every 10-20 minutes (max 300 mg); then infusion 2-8 mg/min
4Alternative: Clevidipine 1-2 mg/h IV infusion; titrate by doubling every 90 seconds; max 32 mg/h
5Target SBP 130-140 mmHg; avoid SBP < 130 (risk of renal injury) or > 160 (risk of hematoma expansion)
6Maintain target for at least 24-72 hours
7Transition to oral antihypertensives when patient is neurologically stable and tolerating PO

5. Hematoma Expansion

5.1 Definition and Significance

Hematoma expansion is defined as an increase in hemorrhage volume of > 33% or > 6 mL from the initial CT scan to follow-up imaging (typically at 24 hours). It occurs in approximately 20-30% of patients, primarily within the first 3-6 hours.1 7

5.2 Predictors of Hematoma Expansion

PredictorClinical Significance
CT angiography spot signActive contrast extravasation within the hematoma on CTA; sensitivity ~60%, specificity ~90% for expansion; strongest imaging predictor
Time from onsetEarlier presentation = higher risk of ongoing expansion
Initial hematoma volumeLarger initial volume associated with greater expansion
Anticoagulant useWarfarin-related ICH has a prolonged expansion phase (up to 24-48 hours unless INR is reversed)
Dual antiplatelet therapyModest increase in expansion risk
Shape irregularityIrregular or heterogeneous hematoma morphology
Blend signHyper-dense region adjacent to hypo-dense region within the hematoma; suggests active bleeding
Black hole signEncapsulated low-density area within the hematoma on NCCT

5.3 Strategies to Limit Hematoma Expansion

StrategyEvidence
Aggressive BP lowering (SBP < 140)INTERACT2 evidence; standard of care
Anticoagulant reversalCritical for warfarin/DOAC-related ICH; see Section 6
Tranexamic acidTICH-2 trial: no significant reduction in mortality or functional outcome at 90 days, but modest reduction in hematoma expansion; not routinely recommended8
Platelet transfusion (for antiplatelet-related ICH)PATCH trial: platelet transfusion was associated with WORSE outcomes; NOT recommended9
Recombinant Factor VIIaFAST trial: reduced hematoma expansion but no improvement in outcomes; increased thromboembolic events; NOT recommended for routine use10

6. Anticoagulant Reversal in ICH

Reversal of anticoagulation is a critical and time-sensitive intervention in patients with anticoagulant-related ICH. The goal is to normalize hemostasis as rapidly as possible to limit hematoma expansion.1 2

6.1 Warfarin (Vitamin K Antagonist) Reversal

AgentDoseOnsetAdditional Notes
4-Factor Prothrombin Complex Concentrate (4F-PCC)25-50 units/kg IV (dose based on INR — see dosing table below)15-30 minutesFirst-line treatment; contains Factors II, VII, IX, X, and Proteins C and S; preferred over FFP due to faster onset, smaller volume, and more reliable INR correction11
Vitamin K (phytonadione)10 mg IV infused slowly over 10-20 minutes2-4 hours (partial); 12-24 hours (full)Always administer WITH 4F-PCC; vitamin K provides sustained factor production once the PCC effect wanes (~12-24 hours); IV route preferred over PO for speed
Fresh Frozen Plasma (FFP)10-15 mL/kg IV30-60 minutes (after thawing, which adds 30-45 min)Second-line if 4F-PCC unavailable; slower onset; larger volume (risk of volume overload); requires ABO compatibility; less reliable INR correction

4F-PCC Dosing by INR

INR4F-PCC Dose (units/kg)Maximum Dose
2.0-3.925 units/kg2,500 units
4.0-5.935 units/kg3,500 units
≥ 6.050 units/kg5,000 units

Recheck INR 15-30 minutes after 4F-PCC administration. If INR remains > 1.5, administer an additional dose of 4F-PCC.

Target INR: < 1.5 (ideally < 1.3).

6.2 Direct Oral Anticoagulant (DOAC) Reversal

Dabigatran (Direct Thrombin Inhibitor)

AgentDoseNotes
Idarucizumab5 g IV (two 2.5 g vials given as two consecutive infusions or boluses)Specific reversal agent for dabigatran; humanized monoclonal antibody fragment that binds dabigatran with high affinity; complete reversal within minutes; FDA approved for this indication; RE-VERSE AD trial12
4F-PCC (if idarucizumab unavailable)50 units/kg IVNon-specific; may partially restore hemostasis but does not directly reverse dabigatran; second-line option
Activated charcoal50 g PO/NGOnly useful if dabigatran was ingested within the last 2 hours
HemodialysisDabigatran is ~35% dialyzable; consider if idarucizumab unavailable and renal failure present; not practical in the acute setting

Factor Xa Inhibitors (Rivaroxaban, Apixaban, Edoxaban)

AgentDoseNotes
Andexanet alfaLow-dose bolus: 400 mg IV at 30 mg/min, then 4 mg/min infusion × 120 min (total ~480 mg) OR High-dose bolus: 800 mg IV at 30 mg/min, then 8 mg/min infusion × 120 min (total ~960 mg)Specific reversal agent for Factor Xa inhibitors; recombinant modified Factor Xa decoy; ANNEXA-4 trial; FDA approved13
4F-PCC (if andexanet unavailable)50 units/kg IVNon-specific; may partially restore hemostasis; widely available and significantly less expensive than andexanet; many institutions use 4F-PCC as first-line given availability and cost considerations14
Activated charcoal50 g PO/NGOnly useful if Xa inhibitor was ingested within the last 2 hours (rivaroxaban, edoxaban) or 6 hours (apixaban)

Andexanet Alfa Dosing by Agent and Timing

Factor Xa InhibitorLast Dose < 8 hours (or unknown)Last Dose ≥ 8 hours
Rivaroxaban (≤ 10 mg)Low doseLow dose
Rivaroxaban (> 10 mg)High doseLow dose
Apixaban (≤ 5 mg)Low doseLow dose
Apixaban (> 5 mg)High doseLow dose
EdoxabanHigh doseLow dose
EnoxaparinHigh doseLow dose

6.3 Heparin Reversal

AgentDoseNotes
Protamine sulfate (for unfractionated heparin)1 mg protamine per 100 units of heparin given in the preceding 2-3 hours; max single dose 50 mg; give IV slowly over 10 minutesRapidly neutralizes UFH; recheck aPTT 15 minutes after administration; risk of hypotension, bradycardia, anaphylaxis (especially in patients with fish allergy or prior protamine exposure)
Protamine sulfate (for enoxaparin/LMWH)1 mg protamine per 1 mg of enoxaparin given in the preceding 8 hours; give IV slowly over 10 minutes; a second dose of 0.5 mg per 1 mg enoxaparin may be given if bleeding continuesOnly partially reverses LMWH (~60% of anti-Xa activity neutralized); if last dose > 8 hours ago, may not be needed

6.4 Reversal Summary Table

AnticoagulantFirst-Line ReversalSecond-LineTarget
Warfarin4F-PCC + Vitamin K 10 mg IVFFP + Vitamin KINR < 1.5
DabigatranIdarucizumab 5 g IV4F-PCC 50 U/kg; hemodialysisClinical hemostasis; normalized TT/aPTT
Rivaroxaban/Apixaban/EdoxabanAndexanet alfa OR 4F-PCC 50 U/kgActivated charcoal (if recent ingestion)Clinical hemostasis; normalized anti-Xa
Unfractionated heparinProtamine sulfateNormalized aPTT
Enoxaparin (LMWH)Protamine sulfate (partial reversal)Clinical hemostasis

7. Surgical Intervention in ICH

7.1 Key Trials

TrialYearDesignKey Finding
STICH (Surgical Trial in Intracerebral Haemorrhage)2005RCT; n = 1,033; early surgery vs initial conservative managementNo overall benefit of early surgery; subgroup analysis suggested possible benefit in lobar hemorrhages within 1 cm of the cortical surface15
STICH II2013RCT; n = 601; lobar ICH without IVH; 10-100 mL; within 1 cm of cortical surfaceNo significant benefit of early surgery (mRS 0-3: 59% surgery vs 62% conservative; p = 0.37); post-hoc analysis suggested benefit when GCS declining16
MISTIE III (Minimally Invasive Surgery plus Alteplase for ICH Evacuation)2019RCT; n = 506; minimally invasive catheter-based clot evacuation with alteplase irrigation vs standard medical careNo significant benefit on primary endpoint (mRS 0-3: 45% vs 41%; p = 0.33); however, achieving clot reduction to < 15 mL was associated with significantly better outcomes17
ENRICH (Early Minimally-Invasive Removal of ICH)2024RCT; n = 300; early minimally invasive parafascicular surgery (using BrainPath approach) vs standard medical management; lobar or anterior ICH ≥ 30 mLSignificant benefit of early minimally invasive surgery (utility-weighted mRS favoring surgery; p = 0.02); first positive surgical trial for ICH18

7.2 Surgical Indications — Current Recommendations

ScenarioRecommendationEvidence Level
Cerebellar hemorrhage > 3 cm or with brainstem compression or hydrocephalusSurgical evacuation recommended (neurosurgical emergency)Strong; consistent across all guidelines
Cerebellar hemorrhage with neurological deteriorationUrgent surgical evacuationStrong
Supratentorial lobar ICH with neurological deteriorationConsider surgical evacuation, especially if clot is superficial (within 1 cm of cortex)Moderate; supported by STICH subgroup and ENRICH
Supratentorial lobar ICH ≥ 30 mL, stableEarly minimally invasive surgery may be considered based on ENRICHModerate; emerging evidence
Deep (basal ganglia/thalamic) ICHSurgical evacuation generally NOT recommendedStrong; STICH/STICH II showed no benefit for deep hemorrhages
IVH with hydrocephalusExternal ventricular drain (EVD) placementStrong; addresses hydrocephalus; see Section 7.3
Comatose with large hematoma and brainstem herniationSurgery unlikely to benefit; goals-of-care discussionWeak; most patients with GCS 3-4 and large ICH have very poor prognosis

7.3 Intraventricular Hemorrhage (IVH) Management

IVH is present in approximately 45% of ICH patients and is an independent predictor of poor outcome. Treatment focuses on CSF diversion and clot clearance:1

InterventionIndicationDetails
External ventricular drain (EVD)IVH with hydrocephalus (ventriculomegaly) or declining consciousnessStandard neurosurgical procedure; allows CSF drainage and ICP monitoring
Intraventricular tPA (alteplase)IVH causing obstructive hydrocephalus with blood in 3rd or 4th ventricle1 mg alteplase through EVD every 8 hours (max 12 doses or until 3rd/4th ventricle clear); CLEAR III trial showed reduced mortality but not improved functional outcome (mRS 0-3)19

8. Intracranial Pressure (ICP) Management in ICH

8.1 ICP Monitoring

IndicationMethod
GCS ≤ 8 with large ICH or IVHEVD (allows both monitoring and therapeutic CSF drainage)
Clinical signs of elevated ICP (declining consciousness, pupil asymmetry, Cushing triad)EVD or intraparenchymal ICP monitor

ICP targets: < 20 mmHg; cerebral perfusion pressure (CPP) > 60 mmHg.1

8.2 Stepwise ICP Management Protocol

StepInterventionDetails
1General measuresHead of bed elevated 30°; head midline; avoid neck flexion/rotation (impedes venous drainage); avoid hyperthermia; adequate sedation/analgesia
2CSF drainageIf EVD in place, open to drainage at 10-15 cmH2O
3Osmotic therapy — Mannitol0.25-1.0 g/kg IV bolus (20% solution); may repeat every 4-6 hours; hold if serum osmolality > 320 mOsm/kg or osmolar gap > 10
4Osmotic therapy — Hypertonic saline23.4% NaCl: 30 mL IV via central line over 10-20 min; OR 3% NaCl: 150-250 mL bolus or continuous infusion at 0.5-2 mL/kg/h; target Na 145-155 mEq/L
5Hyperventilation (short-term rescue)Target PaCO2 30-34 mmHg; short-term bridge to definitive treatment; rebound ICP elevation occurs with prolonged hyperventilation
6Barbiturate comaPentobarbital 5-20 mg/kg loading dose, then 1-4 mg/kg/h; continuous EEG monitoring to target burst suppression; significant risk of hypotension
7Decompressive craniectomyRescue therapy for refractory ICP elevation; more commonly performed for malignant MCA infarction than primary ICH; limited evidence for ICH

9. General ICH Management

9.1 Initial ED Management Checklist

DomainAction
ABCsSecure airway if GCS ≤ 8; avoid hypoxia (SpO2 > 94%); IV access
Blood pressureInitiate IV antihypertensive immediately if SBP > 150 (target < 140)
Anticoagulant reversalIdentify agent; administer reversal immediately; do not wait for coagulation results if agent is known
LabsCBC, CMP, PT/INR, aPTT, fibrinogen, type and screen; anti-Xa level if on Factor Xa inhibitor; thrombin time if on dabigatran
ImagingNCCT head (hemorrhage confirmed); CTA head to evaluate for spot sign and underlying structural lesion (AVM, aneurysm)
Neurosurgery consultationFor all ICH patients; urgent for cerebellar hemorrhage, large supratentorial hemorrhage with declining exam, or IVH with hydrocephalus
Neurology/stroke teamActivate stroke code; ICH is a stroke
Seizure managementTreat clinical seizures with IV lorazepam, then levetiracetam or fosphenytoin loading; prophylactic antiepileptics are NOT routinely recommended1
DVT prophylaxisIntermittent pneumatic compression devices immediately; pharmacologic prophylaxis (LMWH or UFH) may begin 24-48 hours after onset if hemorrhage is stable on repeat imaging
TemperatureTarget normothermia (< 38°C); treat fever with acetaminophen, cooling blankets
GlucoseTarget 140-180 mg/dL; avoid hypoglycemia
DispositionICU or dedicated stroke unit with neuro-monitoring capability

9.2 Secondary ICH Prevention

FactorRecommendation
Blood pressureLong-term target < 130/80 mmHg; single most important modifiable risk factor
Anticoagulation restartRisk-benefit analysis; generally restart after 4-8 weeks if strong indication (mechanical heart valve, high CHA2DS2-VASc); consider PFO closure or left atrial appendage occlusion if recurrent lobar ICH
Antiplatelet therapyCan generally be restarted after 2-4 weeks if indicated; RESTART trial showed no significant increase in recurrent ICH20
Statin therapyContinue or initiate; despite theoretical concerns about ICH risk, statin benefits for cardiovascular risk reduction generally outweigh hemorrhagic risk
Alcohol cessationCounsel all patients with alcohol-related risk
Imaging follow-upMRI with GRE/SWI to evaluate for cerebral amyloid angiopathy (lobar microbleeds) or other structural lesions

10. Prognostication and Goals of Care

10.1 Timing of Prognostication

The 2022 guideline from the major cardiovascular and stroke professional societies explicitly recommends:1

Recommendation: It is reasonable to postpone new DNR orders for at least the first 24 hours after ICH onset, and to provide aggressive full care during that time, to allow for initial clinical stabilization and to avoid the self-fulfilling prophecy of early withdrawal of care.

10.2 Factors Associated with Poor Prognosis

FactorImpact
ICH Score ≥ 330-day mortality > 70%
GCS ≤ 4 at presentationVery high mortality
Hematoma volume > 60 mLPoor functional outcomes in nearly all patients
IVH with hydrocephalusIndependent predictor of poor outcome
Brainstem hemorrhageVery high mortality
Infratentorial locationWorse prognosis than supratentorial for same volume
Ongoing hematoma expansionPoor prognosis if not controlled
Anticoagulant-related and reversal delayedHigher mortality if reversal not achieved promptly

10.3 Principles of Goals-of-Care Discussions

  • Avoid premature prognostication in the first 24-72 hours
  • Communicate uncertainty honestly — prediction models have limited accuracy for individual patients
  • Consider the patient’s values and previously expressed wishes
  • Engage palliative care for complex discussions, not just end-of-life care
  • Document goals-of-care discussions and decisions clearly

References


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