What is Intracerebral Hemorrhage (ICH)?
Intracerebral hemorrhage (ICH) is a type of stroke caused by bleeding within the brain parenchyma (brain tissue itself), as opposed to subarachnoid hemorrhage which occurs in the space surrounding the brain. ICH accounts for approximately 10–15% of all strokes but is disproportionately deadly, with 30-day mortality rates ranging from 30% to over 50% depending on the patient population and hemorrhage characteristics.
When an ICH occurs, blood accumulates within the brain tissue, creating a hematoma that compresses and displaces surrounding structures. The mass effect from the hematoma, along with surrounding edema (swelling), causes neurological deficits that vary depending on the location and size of the hemorrhage. The bleeding may also extend into the ventricular system (intraventricular hemorrhage, or IVH), which worsens prognosis by obstructing cerebrospinal fluid flow and causing hydrocephalus.
ICH is a medical emergency that requires immediate diagnosis (typically with CT scan, which shows acute blood as a bright white area) and management in a specialized stroke unit or neurointensive care unit. Despite advances in medical care, ICH remains the most lethal and disabling form of stroke, with only about 20% of survivors achieving functional independence at 6 months.
Causes of ICH
The causes of intracerebral hemorrhage can be broadly categorized as follows:
- Hypertension (most common): Chronic high blood pressure causes damage to small perforating arteries in the brain (lipohyalinosis and microaneurysm formation), which eventually rupture. Hypertensive ICH typically occurs in the basal ganglia, thalamus, pons, and cerebellum. This accounts for 55–70% of all ICH cases.
- Cerebral amyloid angiopathy (CAA): A condition in which amyloid-beta protein deposits in the walls of cortical and leptomeningeal blood vessels, making them fragile and prone to rupture. CAA predominantly affects older adults (over 65) and causes lobar hemorrhages (in the cortex and subcortex). It is the second most common cause of spontaneous ICH.
- Anticoagulant-related: Patients on anticoagulants (warfarin, heparin, direct oral anticoagulants) have a 7–10 fold increased risk of ICH. Anticoagulant-related ICH tends to be larger and more likely to expand, resulting in worse outcomes. Rapid reversal of anticoagulation is critical in these patients.
- Vascular malformations: Arteriovenous malformations (AVMs), cavernous malformations, and dural arteriovenous fistulas can cause ICH, particularly in younger patients.
- Other causes: Brain tumors (primary or metastatic), hemorrhagic transformation of ischemic stroke, cocaine/amphetamine use, coagulopathies, and moyamoya disease.
The ICH Score — Development and Validation
The ICH Score was developed by Dr. J. Claude Hemphill III and colleagues at the University of California, San Francisco, and published in the journal Stroke in 2001. The study analyzed 152 patients with spontaneous ICH to identify the most powerful independent predictors of 30-day mortality.
Using multivariate logistic regression, they identified five factors that independently predicted mortality: Glasgow Coma Scale (GCS) score, ICH volume, presence of intraventricular hemorrhage, infratentorial origin, and age 80 years or older. These five components were combined into a simple integer-based scoring system (range 0–6) that provides a rapid and reliable estimate of mortality risk.
The ICH Score has been validated in numerous subsequent studies across diverse patient populations worldwide. It has become the most widely used prognostic tool for ICH in clinical practice and research. Its simplicity — requiring only information routinely available at presentation (clinical exam and initial CT scan) — makes it practical for emergency settings where rapid prognostic assessment is needed.
Scoring Components Explained
1. Glasgow Coma Scale (GCS) — 0 to 2 points
The GCS is the single strongest predictor of ICH mortality. It reflects the degree of consciousness impairment caused by the hemorrhage. GCS scores of 13–15 (mild impairment or alert) receive 0 points, scores of 5–12 (moderate impairment) receive 1 point, and scores of 3–4 (severe impairment, essentially comatose) receive 2 points. The GCS is weighted more heavily than other components because level of consciousness is the most important determinant of outcome in ICH.
2. ICH Volume — 0 to 1 point
ICH volume is typically estimated using the ABC/2 method on CT scan, where A is the largest diameter, B is the largest diameter perpendicular to A, and C is the number of CT slices with hemorrhage multiplied by slice thickness. Volumes ≥30 mL receive 1 point; <30 mL receive 0 points. Larger hemorrhages cause more mass effect, edema, and tissue destruction.
3. Intraventricular Hemorrhage (IVH) — 0 to 1 point
Extension of blood into the ventricular system (the fluid-filled chambers of the brain) indicates a more severe hemorrhage and is associated with hydrocephalus, which increases intracranial pressure. Any blood visible in the ventricles on CT scan scores 1 point. IVH is present in approximately 40% of ICH cases and is independently associated with poor outcomes.
4. Infratentorial Origin — 0 to 1 point
Hemorrhages originating in the posterior fossa (cerebellum or brainstem, collectively called the infratentorial compartment) receive 1 point. These locations are more dangerous because the posterior fossa is a small, confined space where even modest volumes of blood can compress the brainstem (which controls vital functions like breathing and consciousness) and obstruct CSF flow, causing acute hydrocephalus.
5. Age — 0 to 1 point
Patients aged 80 years or older receive 1 point. Advanced age is associated with worse outcomes due to reduced physiological reserve, greater brain atrophy (which paradoxically allows hematoma expansion before symptoms appear), increased likelihood of comorbidities, and higher rates of anticoagulant use. The 80-year threshold was identified as the optimal cutoff in the original study.
Mortality by ICH Score
| ICH Score | 30-Day Mortality (%) | Interpretation |
|---|---|---|
| 0 | 0% | Excellent prognosis |
| 1 | 13% | Good prognosis |
| 2 | 26% | Moderate prognosis |
| 3 | 72% | Poor prognosis |
| 4 | 97% | Very poor prognosis |
| 5 | 100% | Uniformly fatal |
| 6 | 100% | Uniformly fatal |
These mortality rates are from the original Hemphill 2001 study. Subsequent validation studies have shown some variation in exact percentages, but the overall trend — a steep increase in mortality between scores of 2 and 4 — is consistently reproduced.
Treatment Options
Treatment of ICH focuses on several key priorities:
- Blood pressure management: Aggressive lowering of systolic blood pressure to <140 mmHg within the first hour (per AHA/ASA 2022 guidelines) has been shown to reduce hematoma expansion and may improve outcomes. IV medications such as nicardipine, labetalol, and clevidipine are commonly used.
- Reversal of anticoagulation: For patients on warfarin, vitamin K and prothrombin complex concentrate (PCC) should be administered emergently. For DOAC-related ICH, specific reversal agents (idarucizumab for dabigatran, andexanet alfa for factor Xa inhibitors) or PCC may be used.
- Surgical evacuation: The role of surgery remains debated. The STICH and STICH II trials did not show clear benefit for supratentorial ICH, but minimally invasive techniques (endoscopic evacuation, stereotactic aspiration with thrombolysis) show promise in recent trials (MISTIE III, ENRICH). Cerebellar hemorrhages >3 cm with neurological deterioration or brainstem compression are widely accepted as surgical emergencies.
- Ventricular drainage: External ventricular drain (EVD) placement is indicated for patients with IVH causing hydrocephalus and decreased consciousness.
- Supportive care: ICU-level monitoring, seizure prophylaxis (controversial), deep vein thrombosis prevention, glycemic control, and temperature management.
Prognosis Factors Beyond the ICH Score
While the ICH Score is a powerful prognostic tool, several additional factors influence outcomes:
- Hematoma expansion: Approximately one-third of ICH patients experience significant hematoma growth in the first 24 hours, which is one of the strongest predictors of early neurological deterioration and death. The CT angiography "spot sign" (contrast extravasation within the hematoma) predicts expansion.
- Perihematomal edema: Swelling around the hematoma develops over the first 72 hours and contributes to secondary brain injury. The degree of edema relative to hematoma size may predict functional outcomes.
- Location specificity: Thalamic hemorrhages tend to have worse outcomes than putaminal hemorrhages of similar size due to the thalamus's role in consciousness and its proximity to the ventricles.
- Pre-morbid functional status: Patients with good baseline function before the hemorrhage tend to have better recovery potential.
- Early do-not-resuscitate (DNR) orders: Studies have shown that early DNR orders are associated with increased mortality, raising concerns about self-fulfilling prophecy. Aggressive early treatment regardless of initial prognosis may improve outcomes.
Limitations and Ethical Considerations
The ICH Score has important limitations that clinicians must consider:
- Self-fulfilling prophecy: If clinicians use a high ICH Score to justify withdrawal of aggressive treatment, the predicted mortality becomes inevitable. The original study's mortality data may partly reflect treatment withdrawal decisions rather than inherent disease lethality. Multiple studies have shown that patients with high ICH Scores can survive with aggressive care.
- Does not predict functional outcomes: The ICH Score was designed to predict mortality, not functional recovery. A patient may survive but with severe disability, or conversely, may survive with surprisingly good function. Additional scales like the FUNC Score address functional outcomes.
- Not designed for individual prediction: The ICH Score provides population-level risk estimates. For an individual patient, the actual outcome depends on many additional factors including treatment decisions, complications, and rehabilitation.
- Should not be used alone for goals-of-care decisions: The AHA/ASA guidelines explicitly recommend against using prognostic scores as the sole basis for limiting care. Early aggressive treatment (at least in the first 24–48 hours) is recommended for all ICH patients regardless of initial score.
Frequently Asked Questions
What is the ICH Score used for?
The ICH Score is used to estimate the risk of 30-day mortality in patients who have suffered a spontaneous intracerebral hemorrhage. It helps clinicians communicate prognosis to families, stratify patients for clinical trials, and guide (but not dictate) treatment decisions. It is calculated using five readily available clinical and imaging features.
Can a patient with a high ICH Score survive?
Yes. Although the original study reported 100% mortality for scores of 5 and 6, subsequent studies with more aggressive treatment approaches have documented survivors at all score levels. This is one reason why the score should not be used as the sole determinant of whether to continue or withdraw life-sustaining treatment.
How is ICH volume measured?
ICH volume is most commonly estimated using the ABC/2 method on a non-contrast CT scan. A is the largest diameter of the hemorrhage (in cm), B is the largest diameter perpendicular to A on the same slice, and C is the approximate number of CT slices with hemorrhage multiplied by slice thickness. The formula ABC/2 approximates the volume of an ellipsoid in cubic centimeters (mL).
What is the difference between ICH and other types of brain hemorrhage?
Intracerebral hemorrhage (ICH) involves bleeding within the brain tissue itself. Subarachnoid hemorrhage (SAH) involves bleeding in the space between the brain surface and the arachnoid membrane, usually from a ruptured aneurysm. Subdural and epidural hematomas involve bleeding between the brain surface and the skull. Each type has different causes, presentations, treatments, and prognoses.
Is the ICH Score the only prognostic tool for ICH?
No. Other scoring systems include the FUNC Score (which predicts functional independence at 90 days rather than mortality), the modified ICH Score (which adds anticoagulation status), the ICH Grading Scale (Ruiz-Sandoval), and the NIHSS-based models. The ICH Score remains the most widely used and validated due to its simplicity and strong predictive performance.
Should treatment be withdrawn for high ICH Scores?
Current AHA/ASA guidelines recommend against early withdrawal of care based solely on prognostic scores. At minimum, aggressive full care should be provided for the first 24–48 hours to allow for stabilization and a more reliable assessment of prognosis. Goals-of-care discussions should incorporate the patient's previously expressed wishes, overall medical context, and the understanding that prognostic tools have significant uncertainty at the individual level.