Intracranial hemorrhage

Intracranial hemorrhage
Axial CT scan of a spontaneous intracranial hemorrhage
Classification and external resources
Specialty	emergency medicine
ICD-10	I60.0-I62, S06
ICD-9-CM	430-432, 850-854
DiseasesDB	6870
eMedicine	neuro/177
MeSH	D020300

An intracranial hemorrhage (ICH) is a hemorrhage, or bleeding, within the skull.

Causes

Intracranial bleeding occurs when a blood vessel within the skull is ruptured or leaks. It can result from physical trauma (as occurs in head injury) or nontraumatic causes (as occurs in hemorrhagic stroke) such as a ruptured aneurysm. Anticoagulant therapy, as well as disorders with blood clotting can heighten the risk that an intracranial hemorrhage will occur.^[1]

Prognosis

Intracranial hemorrhage is a serious medical emergency because the buildup of blood within the skull can lead to increases in intracranial pressure, which can crush delicate brain tissue or limit its blood supply. Severe increases in intracranial pressure (ICP) can cause potentially deadly brain herniation, in which parts of the brain are squeezed past structures in the skull. When ICP is increased the heart rate should be decreased.

Diagnosis

CT scan (computed tomography) is the definitive tool for accurate diagnosis of an intracranial hemorrhage. In difficult cases, a 3T-MRI scan can also be used.

Classification

Types of intracranial hemorrhage are roughly grouped into intra-axial and extra-axial. The hemorrhage is considered a focal brain injury; that is, it occurs in a localized spot rather than causing diffuse damage over a wider area.

Intra-axial hemorrhage

Main article: cerebral hemorrhage

Intra-axial hemorrhage is bleeding within the brain itself, or cerebral hemorrhage. This category includes intraparenchymal hemorrhage, or bleeding within the brain tissue, and intraventricular hemorrhage, bleeding within the brain's ventricles (particularly of premature infants). Intra-axial hemorrhages are more dangerous and harder to treat than extra-axial bleeds.^[2]

Extra-axial hemorrhage

Extra-axial hemorrhage, bleeding that occurs within the skull but outside of the brain tissue, falls into three subtypes:

Epidural hemorrhage (extradural hemorrhage) which occur between the dura mater (the outermost meninx) and the skull, is caused by trauma. It may result from laceration of an artery, most commonly the middle meningeal artery. This is a very dangerous type of injury because the bleed is from a high-pressure system and deadly increases in intracranial pressure can result rapidly. However, it is the least common type of meningeal bleeding and is seen in 1% to 3% cases of head injury .
- Patients have a loss of consciousness (LOC), then a lucid interval, then sudden deterioration (vomiting, restlessness, LOC)
- Head CT shows lenticular (convex) deformity.
Subdural hemorrhage results from tearing of the bridging veins in the subdural space between the dura and arachnoid mater.
- Head CT shows crescent-shaped deformity
Subarachnoid hemorrhage, which occur between the arachnoid and pia meningeal layers, like intraparenchymal hemorrhage, can result either from trauma or from ruptures of aneurysms or arteriovenous malformations. Blood is seen layering into the brain along sulci and fissures, or filling cisterns (most often the suprasellar cistern because of the presence of the vessels of the circle of Willis and their branchpoints within that space). The classic presentation of subarachnoid hemorrhage is the sudden onset of a severe headache (a thunderclap headache). This can be a very dangerous entity, and requires emergent neurosurgical evaluation, and sometimes urgent intervention.

Epidural hematoma

Main article: Epidural hematoma

Hematoma type	Epidural	Subdural
Location	Between the skull and the outer endosteal layer of the dura mater	Between the dura and the arachnoid
Involved vessel	Temperoparietal locus (most likely) - Middle meningeal artery Frontal locus - anterior ethmoidal artery Occipital locus - transverse or sigmoid sinuses Vertex locus - superior sagittal sinus	Bridging veins
Symptoms(depend on severity)^[3]	Lucid interval followed by unconsciousness	Gradually increasing headache and confusion
CT appearance	Biconvex lens	Crescent-shaped

Epidural hematoma (EDH) is a rapidly accumulating hematoma between the dura mater and the cranium. These patients have a history of head trauma with loss of consciousness, then a lucid period, followed by loss of consciousness. Clinical onset occurs over minutes to hours. Many of these injuries are associated with lacerations of the middle meningeal artery. A "lenticular", or convex, lens-shaped extracerebral hemorrhage that does not cross suture lines will likely be visible on a CT scan of the head. Although death is a potential complication, the prognosis is good when this injury is recognized and treated.

Subdural hematoma

Main article: Subdural hematoma

Subdural hematoma occurs when there is tearing of the bridging vein between the cerebral cortex and a draining venous sinus. At times they may be caused by arterial lacerations on the brain surface. Acute subdural hematomas are usually associated with cerebral cortex injury as well and hence the prognosis is not as good as extra dural hematomas. Clinical features depend on the site of injury and severity of injury. Patients may have a history of loss of consciousness but they recover and do not relapse. Clinical onset occurs over hours. A crescent shaped hemorrhage compressing the brain that does cross suture lines will be noted on CT of the head. Craniotomy and surgical evacuation is required if there is significant pressure effect on the brain.Complications include focal neurologic deficits depending on the site of hematoma and brain injury, increased intra cranial pressure leading to herniation of brain and ischemia due to reduced blood supply and seizures.

Subarachnoid hemorrhage

Main article: Subarachnoid hemorrhage

A subarachnoid hemorrhage is bleeding into the subarachnoid space—the area between the arachnoid membrane and the pia mater surrounding the brain. Besides from head injury, it may occur spontaneously, usually from a ruptured cerebral aneurysm. Symptoms of SAH include a severe headache with a rapid onset ("thunderclap headache"), vomiting, confusion or a lowered level of consciousness, and sometimes seizures.^[4] The diagnosis is generally confirmed with a CT scan of the head, or occasionally by lumbar puncture. Treatment is by prompt neurosurgery or radiologically guided interventions with medications and other treatments to help prevent recurrence of the bleeding and complications. Since the 1990s, many aneurysms are treated by a minimal invasive procedure called "coiling", which is carried out by instrumentation through large blood vessels. However, this procedure has higher recurrence rates than the more invasive craniotomy with clipping.^[4]

References

↑ Kushner D (1998). "Mild Traumatic Brain Injury: Toward Understanding Manifestations and Treatment". Archives of Internal Medicine 158 (15): 1617–1624. doi:10.1001/archinte.158.15.1617. PMID 9701095.
↑ Seidenwurm DI (2007). "Introduction to brain imaging". In Brant WE, Helms CA. Fundamentals of Diagnostic Radiology. Philadelphia: Lippincott, Williams & Wilkins. p. 53. ISBN 0-7817-6135-2. Retrieved 2008-11-17.
↑ http://www.brainline.org/multimedia/video/transcripts/Dr.Jane_Gillett-Whats_the_Difference_Between_a_Subdural_and_Epidural_Hematoma.pdf
1 2 van Gijn J, Kerr RS, Rinkel GJ (2007). "Subarachnoid haemorrhage". Lancet 369 (9558): 306–18. doi:10.1016/S0140-6736(07)60153-6. PMID 17258671.

External links

McCaffrey P. 2001. "The Neuroscience on the Web Series: CMSD 336 Neuropathologies of Language and Cognition." California State University, Chico.
Orlando Regional Healthcare, Education and Development. 2004. "Overview of Adult Traumatic Brain Injuries." Retrieved on January 16, 2008.
Shepherd S. 2004. "Head Trauma." Emedicine.com.
Vinas FC and Pilitsis J. 2004. "Penetrating Head Trauma." Emedicine.com.

Cerebrovascular diseases (G45–G46 and I60–I69, 430–438)

Brain ischemia/
cerebral infarction
(ischemic stroke/TIA)

TACI, PACI	precerebral: Carotid artery stenosis cerebral: MCA ACA Amaurosis fugax Moyamoya disease

POCI	precerebral: Anterior spinal artery syndrome Vertebrobasilar insufficiency Subclavian steal syndrome brainstem: medulla Medial medullary syndrome Lateral medullary syndrome pons Medial pontine syndrome/Foville's Lateral pontine syndrome/Millard-Gubler midbrain Weber's Benedikt Claude's cerebral: PCA Lacunar stroke Dejerine–Roussy syndrome cerebellar

General	cerebral: Cerebral venous sinus thrombosis CADASIL Binswanger's disease Transient global amnesia

Intracranial hemorrhage
(hemorrhagic stroke)

Extra-axial	Epidural Subdural Subarachnoid

Cerebral/Intra-axial	Intraventricular

Brainstem	Duret haemorrhage

Aneurysm

Cerebral aneurysm
- Intracranial berry aneurysm
- Charcot-Bouchard aneurysm

Other/general

Cerebral vasculitis

Neurotrauma (S06, Sx4, T09.3–4, 850–854, 950–957)

Traumatic brain injury	Intracranial hemorrhage Intra-axial Intraparenchymal hemorrhage Intraventricular hemorrhage Extra-axial Subdural hematoma Epidural hematoma Subarachnoid hemorrhage Brain herniation Cerebral contusion Cerebral laceration Concussion Post-concussion syndrome Second-impact syndrome Dementia pugilistica Chronic traumatic encephalopathy Diffuse axonal injury Shaken baby syndrome Penetrating head injury

Spinal cord injury	Anterior cord syndrome Brown-Séquard syndrome Cauda equina syndrome Central cord syndrome Paraplegia Posterior cord syndrome Spinal cord injury without radiographic abnormality Tetraplegia (Quadriplegia)

Peripheral nerves	Nerve injury Peripheral nerve injury Wallerian degeneration Injury of accessory nerve Brachial plexus injury Traumatic neuroma

Trauma

Principles

Assessment

Clinical prediction rules	Revised Trauma Score Injury Severity Score Abbreviated Injury Scale NACA score

Investigations	Diagnostic peritoneal lavage Focused assessment with sonography for trauma

Management

Principles	Advanced trauma life support Trauma surgery Trauma center Trauma team Damage control surgery Early appropriate care

Procedures	Resuscitative thoracotomy

Pathophysiology

Injury	MSK Bone fracture Joint dislocation Degloving Soft tissue injury Resp Flail chest Pneumothorax Hemothorax Diaphragmatic rupture Pulmonary contusion Cardio Internal bleeding Thoracic aorta injury Cardiac tamponade GI Blunt kidney trauma Ruptured spleen Neuro Penetrating head injury Traumatic brain injury Intracranial hemorrhage

Mechanism	Blast injury Blunt trauma Burn Penetrating trauma Crush injury Stab wound Ballistic trauma Electrocution

Region	Abdominal trauma Chest trauma Facial trauma Head injury Spinal cord injury

Demographic	Geriatric trauma Pediatric trauma

Sequelae

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