ICH

ICH
Name	Intracerebral haemorrhage
Caption	CT scan showing spontaneous intracerebral haemorrhage
Field	Neurology, Neurosurgery, Emergency medicine
Symptoms	Sudden focal neurological deficit, headache, vomiting, decreased consciousness
Complications	Hydrocephalus, seizures, herniation, vasospasm
Onset	Acute
Causes	Hypertension, cerebral amyloid angiopathy, anticoagulation, vascular malformations
Diagnosis	CT, MRI, angiography
Treatment	Blood pressure control, reversal of anticoagulation, neurosurgical evacuation, intensive care

ICH

Intracerebral haemorrhage is acute bleeding into the brain parenchyma that produces focal neurological deficits and raised intracranial pressure. It is a subtype of stroke that requires rapid diagnosis and targeted management to reduce mortality and disability. Historical advances in neuroimaging and critical care from institutions such as Mayo Clinic, Johns Hopkins Hospital, Massachusetts General Hospital, Royal College of Physicians, and Karolinska Institute have shaped modern approaches.

Definition and terminology

Intracerebral haemorrhage refers to nontraumatic bleeding within the cerebral hemispheres, brainstem, or cerebellum and is classified alongside subarachnoid haemorrhage, epidural haematoma, and subdural haematoma in stroke and neurotrauma literature. Terminology used in clinical trials and guidelines from organizations such as the World Health Organization, American Heart Association, European Stroke Organisation, National Institute for Health and Care Excellence, and Centers for Disease Control and Prevention distinguishes primary intracerebral haemorrhage from secondary causes like neoplasm or vascular malformation. Synonyms and related entities referenced in landmark studies from Oxford University, Harvard Medical School, Stanford University School of Medicine, and University of California, San Francisco include hypertensive intracerebral haemorrhage, lobar haemorrhage associated with Alzheimer's disease-related cerebral amyloid angiopathy, and anticoagulant-associated intracerebral haemorrhage.

Epidemiology and risk factors

Global burden estimates from agencies like the Global Burden of Disease Study, World Health Organization, and national registries at National Institutes of Health indicate that intracerebral haemorrhage accounts for a significant proportion of stroke morbidity and mortality, with incidence varying by age, sex, and geography. Major population-level risk factors identified in cohort studies from Framingham Heart Study, Rotterdam Study, Atherosclerosis Risk in Communities Study, and datasets from China CDC and European Stroke Organisation include chronic hypertension, cerebral amyloid angiopathy in older adults, anticoagulation therapy such as with vitamin K antagonists or direct oral anticoagulants from pharmaceutical trials, excessive alcohol use documented in public health reports, and illicit stimulant use highlighted in forensic series. Vascular anomalies such as arteriovenous malformations, cavernous malformations, and cerebral aneurysms reported by tertiary centres including Cleveland Clinic and Mayo Clinic represent less common etiologies. Genetic predispositions described in consortia like the International Stroke Genetics Consortium and familial syndromes reported at Johns Hopkins add to individual susceptibility.

Pathophysiology

Primary intracerebral bleeding most commonly arises from rupture of small penetrating arteries damaged by long-standing hypertension or from fragile amyloid-laden vessels in cerebral amyloid angiopathy described in neuropathology series from Cambridge University Hospitals and Queen Square. Haematoma formation produces a mass effect, perihaematomal oedema, and secondary injury mediated by inflammatory cascades, excitotoxicity, free radical production, and breakdown products of haemoglobin as delineated in experimental work from National Institute of Neurological Disorders and Stroke, Walter Reed Army Institute of Research, and university laboratories at Columbia University. Secondary processes include activation of matrix metalloproteinases, blood–brain barrier disruption studied in neurovascular research at Imperial College London, and cerebral autoregulation failure leading to raised intracranial pressure and risk of transtentorial herniation as described in neurosurgical series from Barrow Neurological Institute and UCSF Medical Center.

Clinical presentation and diagnosis

Presentation is typically acute with focal neurological signs such as hemiparesis, aphasia, visual field defects, or ataxia depending on lesion location; reduced level of consciousness, severe headache, nausea, and vomiting may denote larger haematomas or brainstem involvement as characterized in clinical texts from Mayo Clinic and Guy's and St Thomas' NHS Foundation Trust. Initial assessment follows Advanced Trauma Life Support and stroke pathway protocols advocated by American Heart Association and Royal College of Physicians with urgent noncontrast CT for detection of hyperdense haematoma, and MRI including susceptibility-weighted imaging used for subacute or lobar bleeds in centres such as Massachusetts General Hospital. Vascular imaging with CT angiography, MR angiography, or digital subtraction angiography by services at Mount Sinai Health System and Toronto Western Hospital evaluates for underlying arteriovenous malformation or aneurysm. Laboratory testing focuses on coagulation panels, platelet counts, and toxicology screens; scoring systems like the ICH score from landmark prognostic research guide early risk stratification.

Management and treatment

Early management prioritizes airway, breathing, circulation, and rapid blood pressure control guided by randomized trials and guidelines from American Heart Association, European Stroke Organisation, and National Institute for Health and Care Excellence. Reversal of anticoagulation involves targeted therapies such as prothrombin complex concentrate, vitamin K, or specific antidotes studied in trials sponsored by pharmaceutical companies and academic centres including University College London Hospitals and Vanderbilt University Medical Center. Neurosurgical options—open craniotomy, minimally invasive evacuation, or external ventricular drainage for intraventricular extension—are performed in neurosurgical units at Johns Hopkins Hospital, Barrow Neurological Institute, and Cleveland Clinic and evaluated in randomized trials from international consortia. Critical care management addresses intracranial pressure, seizures with antiepileptic drugs reviewed in neurology guidelines from American Epilepsy Society, glycemic control, and prevention of medical complications in stroke units validated by multicentre studies including those from Stroke Unit Trialists' Collaboration.

Prognosis and complications

Outcome after intracerebral haemorrhage ranges from complete recovery to severe disability or death; predictors of poor outcome include haematoma volume, location, intraventricular extension, patient age, and baseline Glasgow Coma Scale as found in prognostic cohorts from Framingham Heart Study and multicentre registries. Common complications are hydrocephalus, seizures, rebleeding, infection, thromboembolism, and cognitive impairment linked to secondary neurodegeneration described in follow-up studies from Alzheimer's Disease Research Center and stroke rehabilitation programs at Kessler Foundation. Long-term management often involves secondary prevention with blood pressure optimization, fall-prevention strategies, and tailored anticoagulation decisions informed by multidisciplinary input from centres like Mayo Clinic and guideline panels from American Heart Association.

Category:Neurology