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Intracerebral hemorrhage

From Wikipedia, the free encyclopedia
Intracerebral hemorrhage
Other namesCerebral haemorrhage, cerebral hemorrhage, intra-axial hemorrhage, cerebral hematoma, cerebral bleed, brain bleed, hemorrhagic stroke
CT scanof a spontaneous intracerebral bleed, leaking into thelateral ventricles
SpecialtyNeurosurgery
SymptomsHeadache,one-sided numbness, weakness, tingling, or paralysis, speech problems, vision or hearing problems, dizziness or lightheadedness or vertigo, nausea/vomiting, seizures,decreased levelortotal loss of consciousness,neck stiffness,memory loss, attention and coordination problems, balance problems,fever,shortness of breath(when bleed is in the brain stem)[1][2]
ComplicationsComa,persistent vegetative state,cardiac arrest(when bleeding is severe or in the brain stem),death
CausesBrain trauma,aneurysms,arteriovenous malformations,brain tumors,hemorrhagic conversion of ischemic stroke[1]
Risk factorsHigh blood pressure,diabetes,high cholesterol,amyloidosis,alcoholism,low cholesterol,blood thinners,cocaineuse[2]
Diagnostic methodCT scan[1]
Differential diagnosisIschemic stroke[1]
TreatmentBlood pressurecontrol, surgery,ventricular drain[1]
Prognosis20% good outcome[2]
Frequency2.5 per 10,000 people a year[2]
Deaths44% die within one month[2]

Intracerebral hemorrhage(ICH), also known ashemorrhagic stroke,is a sudden bleeding intothe tissues of the brain(i.e. the parenchyma), into itsventricles,or into both.[3][4][1]An ICH is a type of bleeding within theskulland one kind ofstroke(ischemic stroke being the other).[3][4]Symptoms can vary dramatically depending on the severity (how much blood), acuity (over what timeframe), and location (anatomically) but can includeheadache,one-sided weakness,numbness, tingling, orparalysis,speech problems, vision or hearing problems, memory loss, attention problems, coordination problems, balance problems,dizzinessorlightheadednessorvertigo,nausea/vomiting, seizures,decreased level of consciousnessortotal loss of consciousness,neck stiffness,andfever.[2][1]

Hemorrhagic stroke may occur on the background of alterations to the blood vessels in the brain, such as cerebralarteriolosclerosis,cerebral amyloid angiopathy,cerebral arteriovenous malformation,brain trauma,brain tumorsand anintracranial aneurysm,which can cause intraparenchymal or subarachnoid hemorrhage.[1]

The biggest risk factors for spontaneous bleeding arehigh blood pressureandamyloidosis.[2]Other risk factors includealcoholism,low cholesterol,blood thinners,andcocaineuse.[2]Diagnosis is typically byCT scan.[1]

Treatment should typically be carried out in anintensive care unitdue to strict blood pressure goals and frequent use of both pressors and antihypertensive agents.[1][5]Anticoagulationshould be reversed if possible andblood sugarkept in the normal range.[1]A procedure to place anexternal ventricular drainmay be used to treathydrocephalusor increasedintracranial pressure,however, the use ofcorticosteroidsis frequently avoided.[1]Sometimes surgery to directly remove the blood can be therapeutic.[1]

Cerebral bleeding affects about 2.5 per 10,000 people each year.[2]It occurs more often in males and older people.[2]About 44% of those affected die within a month.[2]A good outcome occurs in about 20% of those affected.[2]Intracerebral hemorrhage, a type of hemorrhagic stroke, was first distinguished from ischemic strokes due to insufficient blood flow, so called "leaks and plugs", in 1823.[6]

Epidemiology[edit]

The incidence of intracerebral hemorrhage is estimated at 24.6 cases per 100,000 person years with the incidence rate being similar in men and women.[7][8]The incidence is much higher in the elderly, especially those who are 85 or older, who are 9.6 times more likely to have an intracerebral hemorrhage as compared to those of middle age.[8]It accounts for 20% of all cases ofcerebrovascular diseasein the United States, behindcerebral thrombosis(40%) andcerebral embolism(30%).[9]

Types[edit]

Intraparenchymal hemorrhage[edit]

Intraparenchymal hemorrhage(IPH) is one form ofintracerebral bleedingin which there is bleeding within brainparenchyma.[10]Intraparenchymal hemorrhage accounts for approximately 8-13% of allstrokesand results from a wide spectrum of disorders. It is more likely to result indeathor majordisabilitythanischemic strokeorsubarachnoid hemorrhage,and therefore constitutes an immediatemedical emergency.Intracerebral hemorrhages and accompanyingedemamay disrupt or compress adjacentbrain tissue,leading to neurological dysfunction. Substantial displacement of brain parenchyma may cause elevation ofintracranial pressure(ICP) and potentially fatalherniation syndromes.

Intraventricular hemorrhage[edit]

Intraventricular hemorrhage(IVH), also known asintraventricular bleeding, is ableedinginto the brain'sventricular system,where thecerebrospinal fluidis produced and circulates through towards thesubarachnoid space.It can result fromphysical traumaor fromhemorrhagic stroke.

30% of intraventricular hemorrhage (IVH) are primary, confined to the ventricular system and typically caused by intraventricular trauma, aneurysm, vascular malformations, or tumors, particularly of the choroid plexus.[11]However 70% of IVH are secondary in nature, resulting from an expansion of an existing intraparenchymal or subarachnoid hemorrhage.[11]Intraventricular hemorrhage has been found to occur in 35% of moderate to severetraumatic brain injuries.[12]Thus the hemorrhage usually does not occur without extensive associated damage, and so the outcome is rarely good.[13][14]

Signs and symptoms[edit]

People with intracerebral bleeding have symptoms that correspond to the functions controlled by the area of the brain that is damaged by the bleed.[15]These localizing signs and symptoms can includehemiplegia(or weakness localized to one side of the body) and paresthesia (loss of sensation) including hemisensory loss (if localized to one side of the body).[7]These symptoms are usually rapid in onset, sometimes occurring in minutes, but not as rapid as the symptom onset inischemic stroke.[7]While the duration of onset not be as rapid, it is important that patients go to the emergency department as soon as they notice any symptoms as early detection and management of stroke may lead to better outcomes post-stroke than delayed identification.[16]

A mnemonic to remember the warning signs of stroke isFAST(facial droop, arm weakness, speech difficulty, and time to call emergency services),[17]as advocated by theDepartment of Health (United Kingdom)and theStroke Association,theAmerican Stroke Association,theNational Stroke Association(US), theLos Angeles Prehospital Stroke Screen (LAPSS)[18]and theCincinnati Prehospital Stroke Scale(CPSS).[19]Use of these scales is recommended by professional guidelines.[20]FAST is less reliable in the recognition of posterior circulation stroke.[21]

Other symptoms include those that indicate a rise inintracranial pressurecaused by a large mass (due to hematoma expansion) putting pressure on the brain.[15]These symptoms includeheadaches,nausea, vomiting, a depressed level of consciousness, stupor and death.[7]Continued elevation in the intracranial pressure and the accompanying mass effect may eventually causebrain herniation(when different parts of the brain are displaced or shifted to new areas in relation to the skull and surroundingdura matersupporting structures). Brain herniation is associated withhyperventilation,extensor rigidity,pupillary asymmetry,pyramidal signs,comaand death.[10]

Hemorrhage into thebasal gangliaorthalamuscauses contralateral hemiplegia due to damage to theinternal capsule.[7]Other possible symptoms includegaze palsiesor hemisensory loss.[7]Intracerebral hemorrhage into thecerebellummay causeataxia,vertigo,incoordination of limbs and vomiting.[7]Some cases of cerebellar hemorrhage lead to blockage of thefourth ventriclewith subsequent impairment of drainage ofcerebrospinal fluidfrom the brain.[7]The ensuinghydrocephalus,or fluid buildup in theventriclesof the brain leads to a decreased level of consciousness,total loss of consciousness,coma,andpersistent vegetative state.[7]Brainstem hemorrhage most commonly occurs in theponsand is associated withshortness of breath,cranial nerve palsies,pinpoint (but reactive) pupils, gaze palsies, facial weakness,coma,andpersistent vegetative state(if there is damage to thereticular activating system).[7]

Causes[edit]

Axial CT scan showing hemorrhage in theposterior fossa[22]

Intracerebral bleeds are the second most common cause ofstroke,accounting for 10% of hospital admissions for stroke.[23]High blood pressureraises the risks of spontaneous intracerebral hemorrhage by two to six times.[22]More common in adults than in children, intraparenchymal bleeds are usually due topenetrating head trauma,but can also be due to depressedskull fractures.Acceleration-deceleration trauma,[24][25][26]rupture of ananeurysmorarteriovenous malformation(AVM), and bleeding within atumorare additional causes.Amyloid angiopathyis not an uncommon cause of intracerebral hemorrhage in patients over the age of 55. A very small proportion is due tocerebral venous sinus thrombosis.[citation needed]

Risk factors for ICH include:[11]

Hypertension is the strongest risk factor associated with intracerebral hemorrhage and long term control of elevated blood pressure has been shown to reduce the incidence of hemorrhage.[7]Cerebral amyloid angiopathy,a disease characterized by deposition ofamyloid betapeptides in the walls of the small blood vessels of the brain, leading to weakened blood vessel walls and an increased risk of bleeding; is also an important risk factor for the development of intracerebral hemorrhage. Other risk factors include advancing age (usually with a concomitant increase of cerebral amyloid angiopathy risk in the elderly), use ofanticoagulantsorantiplatelet medications,the presence of cerebral microbleeds,chronic kidney disease,and lowlow density lipoprotein(LDL) levels (usually below 70).[27][28]The direct oral anticoagulants (DOACs) such as thefactor Xa inhibitorsordirect thrombin inhibitorsare thought to have a lower risk of intracerebral hemorrhage as compared to thevitamin K antagonistssuch aswarfarin.[7]

Cigarette smokingmay be a risk factor but the association is weak.[29]

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.[citation needed]

Diagnosis[edit]

Spontaneous ICH withhydrocephaluson CT scan[22]

Bothcomputed tomography angiography(CTA) andmagnetic resonance angiography(MRA) have been proved to be effective in diagnosing intracranial vascular malformations after ICH.[12]So frequently, a CT angiogram will be performed in order to exclude a secondary cause of hemorrhage[30]or to detect a "spot sign".

Intraparenchymal hemorrhagecan be recognized onCT scansbecause 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 ofedema,and therefore shows up darker on the CT scan.[30]The oedema surrounding the haemorrhage would rapidly increase in size in the first 48 hours, and reached its maximum extent at day 14. The bigger the size of the haematoma, the larger its surrounding oedema.[31]Brain oedema formation is due to the breakdown of red blood cells, where haemoglobin and other contents of red blood cells are released. The release of these red blood cells contents causes toxic effect on the brain and causes brain oedema. Besides, the breaking down of blood-brain barrier also contributes to the odema formation.[13]

Apart from CT scans, haematoma progression of intracerebral haemorrhage can be monitored using transcranial ultrasound. Ultrasound probe can be placed at the temporal lobe to estimate the volume of haematoma within the brain, thus identifying those with active bleeding for further intervention to stop the bleeding. Using ultrasound can also reduces radiation risk to the subject from CT scans.[14]

Location[edit]

When due tohigh blood pressure,intracerebral hemorrhages typically occur in theputamen(50%) orthalamus(15%), cerebrum (10–20%), cerebellum (10–13%), pons (7–15%), or elsewhere in the brainstem (1–6%).[32][33]

Treatment[edit]

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

Medications[edit]

Rapid lowering of the blood pressure usingantihypertensive therapyfor those withhypertensive emergencycan have higher functional recovery at 90 days post intracerebral haemorrhage, when compared to those who undergone other treatments such as mannitol administration, reversal of anticoagulation (those previously on anticoagulant treatment for other conditions), surgery to evacuate the haematoma, and standard rehabilitation care in hospital, while showing similar rate of death at 12%.[35]Early lowering of the blood pressure can reduce the volume of the haematoma, but may not have any effect against the oedema surrounding the haematoma.[36]Reducing the blood pressure rapidly does not causebrain ischemiain those who have intracerebral haemorrhage.[37]TheAmerican Heart AssociationandAmerican Stroke Associationguidelines in 2015 recommended decreasing the blood pressure to a SBP of 140 mmHg.[1]However, later reviews found unclear difference between intensive and less intensive blood pressure control.[38][39]

GivingFactor VIIawithin 4 hours limits the bleeding and formation of ahematoma.However, it also increases the risk ofthromboembolism.[34]It thus overall does not result in better outcomes in those without hemophilia.[40]

Frozen plasma,vitamin K,protamine,orplatelet transfusionsmay be given in case of acoagulopathy.[34]Platelets however appear to worsen outcomes in those with spontaneous intracerebral bleeding on antiplatelet medication.[41]

The specific reversal agentsidarucizumabandandexanet alfamay be used to stop continued intracerebral hemorrhage in people taking directly oral acting anticoagulants (such as factor Xa inhibitors or direct thrombin inhibitors).[7]However, if these specialized medications are not available,prothrombin complex concentratemay also be used.[7]

Only 7% of those with ICH are presented with clinical features of seizures while up to 25% of those have subclinical seizures. Seizures are not associated with an increased risk of death or disability. Meanwhile, anticonvulsant administration can increase the risk of death. Therefore, anticonvulsants are only reserved for those that have shown obvious clinical features of seizures or seizure activity onelectroencephalography(EEG).[42]

H2 antagonists or proton pump inhibitors are commonly given to try to preventstress ulcers,a condition linked with ICH.[34]

Corticosteroidswere thought to reduce swelling. However, in large controlled studies, corticosteroids have been found to increase mortality rates and are no longer recommended.[43][44]

Surgery[edit]

Surgery is required if thehematomais greater than 3 cm (1 in), if there is a structuralvascularlesionorlobarhemorrhagein a young patient.[34]

Acathetermay be passed into the brainvasculatureto close off or dilateblood vessels,avoiding invasive surgical procedures.[45]

Aspiration bystereotactic surgeryorendoscopicdrainage may be used inbasal gangliahemorrhages, although successful reports are limited.[34]

Acraniectomyholds promise of reduced mortality, but the effects of long‐term neurological outcome remain controversial.[46]

Prognosis[edit]

About 8 to 33% of those with intracranial haemorrhage have neurological deterioration within the first 24 hours of hospital admission, where a large proportion of them happens within 6 to 12 hours. Rate of haematoma expansion, perihaematoma odema volume and the presence of fever can affect the chances of getting neurological complications.[47]

The risk of death from an intraparenchymal bleed in traumatic brain injury is especially high when the injury occurs in thebrain stem.[48]Intraparenchymal bleeds within themedulla oblongataare almost always fatal, because they cause damage to cranial nerve X, thevagus nerve,which plays an important role inblood circulationand breathing.[24]This kind of hemorrhage can also occur in thecortexor subcortical areas, usually in thefrontalortemporal lobeswhen due to head injury, and sometimes in thecerebellum.[24][49]Larger volumes of hematoma at hospital admission as well as greater expansion of the hematoma on subsequent evaluation (usually occurring within 6 hours of symptom onset) are associated with a worse prognosis.[7][50]Perihematomal edema, or secondary edema surrounding the hematoma, is associated with secondary brain injury, worsening neurological function and is associated with poor outcomes.[7]Intraventricular hemorrhage, or bleeding into the ventricles of the brain, which may occur in 30–50% of patients, is also associated with long-term disability and a poor prognosis.[7]Brain herniation is associated with poor prognoses.[7]

For spontaneous intracerebral hemorrhage seen on CT scan, the death rate (mortality) is 34–50% by 30 days after the injury,[22]and half of the deaths occur in the first 2 days.[51]Even though the majority of deaths occur in the first few days after ICH, survivors have a long-term excess mortality rate of 27% compared to the general population.[52]Of those who survive an intracerebral hemorrhage, 12–39% are independent with regard to self-care; others are disabled to varying degrees and require supportive care.[8]

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