Intracerebral hemorrhage

Intracerebral hemorrhage
Synonyms	Cerebral haemorrhage, cerebral hemorrhage, intra-axial hemorrhage, cerebral hematoma, cerebral bleed
CT scan of a spontaneous intracerebral bleed, leaking into the lateral ventricles
Specialty	Neurosurgery
Symptoms	Headache, one-sided weakness, vomiting, seizures, decreased level of consciousness, neck stiffness, fever[1][2]
Causes	Brain trauma, aneurysms, arteriovenous malformations, brain tumors[1]
Risk factors	High blood pressure, amyloidosis, alcoholism, low cholesterol, blood thinners, cocaine[2]
Diagnostic method	CT scan[1]
Similar conditions	Ischemic stroke[1]
Treatment	Blood pressure control, surgery, ventricular drain [1]
Prognosis	20% good outcome[2]
Frequency	2.5 per 10,000 people a year[2]
Deaths	44% die within one month[2]

Intracerebral hemorrhage (ICH), also known as cerebral bleed, is a type of intracranial bleed that occurs within the brain tissue or ventricles.^[3] Symptoms can include headache, one-sided weakness, vomiting, seizures, decreased level of consciousness, and neck stiffness.^[2] Often symptoms get worse over time. Fever is also common. In many cases bleeding is present in both the brain tissue and the ventricles.^[1]

Causes include brain trauma, aneurysms, arteriovenous malformations, and brain tumors.^[1] The largest risk factors for spontaneous bleeding are high blood pressure and amyloidosis. Other risk factors include alcoholism, low cholesterol, blood thinners, and cocaine.^[2] Diagnosis is typically by CT scan. Other conditions that may present similarly include ischemic stroke.^[1]

Treatment should typically be carried out in an intensive care unit. Guidelines recommended decreasing the blood pressure to a systolic of less than 140 mmHg. Blood thinners should be reversed if possible and blood sugar kept in the normal range. Surgery to place a ventricular drain may be used to treat hydrocephalus but corticosteroids should not be used. Surgery to remove the blood is useful in certain cases.^[1]

Cerebral bleeding affects about 2.5 per 10,000 people each year. It occurs more often in males and older people. About 44% of those affected die within a month. A good outcome occurs in about 20% of those affected.^[2] Strokes were first divided into their two major types, bleeding and insufficient blood flow, in 1823.^[4]

Signs and symptoms

Patients with intraparenchymal bleeds have symptoms that correspond to the functions controlled by the area of the brain that is damaged by the bleed.^[5] Other symptoms include those that indicate a rise in intracranial pressure caused by a large mass putting pressure on the brain.^[5] Intracerebral hemorrhages are often misdiagnosed as subarachnoid hemorrhages due to the similarity in symptoms and signs. A severe headache followed by vomiting is one of the more common symptoms of intracerebral hemorrhage. Another common symptom is a patient can collapse. Some people may experience continuous bleeding from the ear. Some patients may also go into a coma before the bleed is noticed.

Causes

Splenial Infarct / Boomerang Sign, Sturge Weber Syndrome / Vein of Galen Malformation

Axial CT scan showing hemorrhage in the posterior fossa^[6]

Intracerebral bleeds are the second most common cause of stroke, accounting for 10% of hospital admissions for stroke.^[7] High blood pressure raises the risks of spontaneous intracerebral hemorrhage by two to six times.^[6] More common in adults than in children, intraparenchymal bleeds are usually due to penetrating head trauma, but can also be due to depressed skull fractures. Acceleration-deceleration trauma,^[8][9][10] rupture of an aneurysm or arteriovenous malformation (AVM), and bleeding within a tumor are additional causes. Amyloid angiopathy is a not uncommon cause of intracerebral hemorrhage in patients over the age of 55. A very small proportion is due to cerebral venous sinus thrombosis.

Risk factors for ICH include:^[11]

• Hypertension (high blood pressure)
• Diabetes mellitus
• Menopause
• Cigarette smoking
• Excessive alcohol consumption
• Severe migraine

Traumautic intracerebral hematomas are divided into acute and delayed. Acute intracerebral hematomas occur at the time of the injury while delayed intracerebral hematomas have been reported from as early as 6 hours post injury to as long as several weeks.

Infection with the k serotype of Streptococcus mutans may also be a risk factor, because of its is more common in people who have had a stroke and productes collagen-binding protein.^[12]

Diagnosis

Spontaneous ICH with hydrocephalus on CT scan^[6]

Both computed tomography angiography (CTA) and magnetic resonance angiography (MRA) have been proved to be effective in diagnosing intracranial vascular malformations after ICH.^[13] So frequently, a CT angiogram will be performed in order to exclude a secondary cause of hemorrhage^[14] or to detect a "spot sign".

Intraparenchymal hemorrhage can be recognized on CT scans because blood appears brighter than other tissue and is separated from the inner table of the skull by brain tissue. The tissue surrounding a bleed is often less dense than the rest of the brain because of edema, and therefore shows up darker on the CT scan.^[14]

Location

When due to high blood pressure, they typically occur in the putamen or thalamus (60%), cerebrum (20%), cerebellum (13) or pons (7%).^[15]

Treatment

Treatment depends substantially of the type of ICH. Rapid CT scan and other diagnostic measures are used to determine proper treatment, which may include both medication and surgery.

• Tracheal intubation is indicated in people with decreased level of consciousness or other risk of airway obstruction.^[16]
• IV fluids are given to maintain fluid balance, using isotonic rather than hypotonic fluids.^[16]

Medication

• One review found that antihypertensive therapy to bring down the blood pressure in acute phases appears to improve outcomes.^[17] Other reviews found an unclear difference between intensive and less intensive blood pressure control.^[18][19] The American Heart Association and American Stroke Association guidelines in 2015 recommended decreasing the blood pressure to a SBP of 140 mmHg.^[1]
• Giving Factor VIIa within 4 hours limits the bleeding and formation of a hematoma. However, it also increases the risk of thromboembolism.^[16] It thus overall does not result in better outcomes in those without hemophilia.^[20]
• Frozen plasma, vitamin K, protamine, or platelet transfusions are given in case of a coagulopathy.^[16]
• Fosphenytoin or other anticonvulsant is given in case of seizures or lobar hemorrhage.^[16]
• H2 antagonists or proton pump inhibitors are commonly given for to try to prevent stress ulcers, a condition linked with ICH.^[16]
• Corticosteroids, were thought to reduce swelling. However, in large controlled studies, corticosteroids have been found to increase mortality rates and are no longer recommended.^[21][22]

Surgery

Surgery is required if the hematoma is greater than 3 cm (1 in), if there is a structural vascular lesion or lobar hemorrhage in a young patient.^[16]

• A catheter may be passed into the brain vasculature to close off or dilate blood vessels, avoiding invasive surgical procedures.^[23]
• Aspiration by stereotactic surgery or endoscopic drainage may be used in basal ganglia hemorrhages, although successful reports are limited.^[16]

Prognosis

The risk of death from an intraparenchymal bleed in traumatic brain injury is especially high when the injury occurs in the brain stem.^[24] Intraparenchymal bleeds within the medulla oblongata are almost always fatal, because they cause damage to cranial nerve X, the vagus nerve, which plays an important role in blood circulation and breathing.^[8] This kind of hemorrhage can also occur in the cortex or subcortical areas, usually in the frontal or temporal lobes when due to head injury, and sometimes in the cerebellum.^[8][25]

For spontaneous ICH seen on CT scan, the death rate (mortality) is 34–50% by 30 days after the insult,^[6] and half of the deaths occur in the first 2 days.^[26] Even though the majority of deaths occurs in the first days after ICH, survivors have a long term excess mortality of 27% compared to the general population.^[27]

The inflammatory response triggered by stroke has been viewed as harmful in the early stage, focusing on blood-borne leukocytes, neutrophils and macrophages, and resident microglia and astrocytes.^[28] A human postmortem study shows that inflammation occurs early and persists for several days after ICH.^[29] New area of interest are the Mast Cells.^[30]

Epidemiology

It accounts for 20% of all cases of cerebrovascular disease in the United States, behind cerebral thrombosis (40%) and cerebral embolism (30%).^[31]

It is two or more times more common in black than white people.^[32]

References

Further reading

• Hemphill JC, 3rd; Greenberg, SM; Anderson, CS; Becker, K; Bendok, BR; Cushman, M; Fung, GL; Goldstein, JN; Macdonald, RL; Mitchell, PH; Scott, PA; Selim, MH; Woo, D (28 May 2015). "Guidelines for the Management of Spontaneous Intracerebral Hemorrhage: A Guideline for Healthcare Professionals From the American Heart Association/American Stroke Association.". Stroke; a journal of cerebral circulation. 46: 2032–60. PMID 26022637. doi:10.1161/STR.0000000000000069. 

External links

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