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| {{SK}}: Extradural hematoma | | {{SK}}: Extradural hematoma |
| == Diagnosis ==
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| ===Clinical Features===
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| Epidural bleeds, like [[subdural hematoma|subdural]] and [[subarachnoid hemorrhage]]s, are [[extra-axial hemorrhage|extra-axial bleeds]], occurring outside of the brain tissue, while [[intra-axial hemorrhage]]s, including [[intraparenchymal hemorrhage|intraparenchymal]] and [[intraventricular hemorrhage]]s, occur within it.<ref>Wagner AL. 2006. [http://www.emedicine.com/radio/topic664.htm "Subdural Hematoma."] Emedicine.com. Retrieved on February 6, 2007. </ref>
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| Epidural bleeding is rapid because it is usually from arteries, which are high pressure. Epidural bleeds from arteries can grow until they reach their peak size at six to eight hours post injury, spilling from 25 to 75 cubic centimeters of blood into the [[intracranial space]].<ref name="uv"/> As the hematoma expands, it strips the dura from the inside of the skull, causing an intense headache.
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| Epidural bleeds can become large and raise [[intracranial pressure]], causing the brain to shift, lose blood supply, or be crushed against the skull. Larger hematomas cause more damage. Epidural bleeds can quickly expand and compress the brain stem, causing [[coma|unconsciousness]], [[abnormal posturing]], and abnormal [[pupil]] responses to light.<ref name="singh Stock">Singh J and Stock A. 2006. [http://www.emedicine.com/ped/topic929.htm "Head Trauma."] Emedicine.com. Retrieved on February 6, 2007.</ref>
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| 10% of epidural bleeds may be venous.<ref name="Shepherd"/>
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| On images produced by [[CT scan]]s and [[MRI]]s, epidural hematomas usually appear convex in shape because their expansion stops at skull's [[skull suture|sutures]], where the dura mater is tightly attached to the skull. Thus they expand inward toward the brain rather than along the inside of the skull, as occurs in [[subdural hematoma]]. The lens like shape of the hematoma leads the appearance of these bleeds to be called "lentiform".
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| Epidural hematomas may occur in combination with subdural hematomas, or either may occur alone.<ref name="Shepherd"/> CT scans reveal subdural or epidural hematomas in 20% of unconscious patients.<ref name="Downie">Downie A. 2001. [http://www.radiology.co.uk/srs-x/tutors/cttrauma/tutor.htm "Tutorial: CT in Head Trauma"]. Retrieved on February 6, 2007.</ref>
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| In the hallmark of epidural hematoma, patients may regain consciousness during what is called a [[lucid interval]], only to descend suddenly and rapidly into unconsciousness later. The lucid interval, which depends on the extent of the injury, is a key to diagnosing epidural hemorrhage. If the patient is not treated with prompt surgical intervention, death is likely to follow.<ref name="Caroline">Caroline NL. 1991. ''Emergency Medical Treatment''. Little Brown & Company.</ref>
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| <gallery>
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| Image:epidural hematoma.jpg|Epidural Hematoma <ref>http://picasaweb.google.com/mcmumbi/USMLEIIImages</ref>
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| Image:Epidural_hematoma2.jpg|Epidural hematomas usually look convex on CT scans
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| Image:Skull interior anatomy.svg|The interior of the skull has sharp ridges by which a moving brain can be injured.
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| </gallery>
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| '''Patient#1'''
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| <gallery>
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| Image:
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| Epidural hematoma 201.jpg
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| </gallery>
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| '''Patient#2'''
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| <gallery>
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| Image:Epidural-hematoma-001.jpg|CT: Epidural hematoma
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| Image:Epidural-hematoma-002.jpg|CT: Epidural hematoma
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| </gallery>
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| '''Patient#3'''
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| <gallery>
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| Image:Epidural-hematoma-201.jpg|CT: Epidural hematoma
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| </gallery>
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| ==Treatment== | | ==Treatment== |
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For patient information click here
Template:DiseaseDisorder infobox
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Synonyms and keywords:: Extradural hematoma
Treatment
As with other types of intracranial hematomas, the blood may be aspirated surgically to remove the mass and reduce the pressure it puts on the brain.[1] The hematoma is neurosurgically evacuated through a burr hole or craniotomy. The diagnosis of epidural hematoma requires a patient to be cared for in a facility with a neurosurgeon on call to decompress the hematoma if necessary and stop the bleed by ligating the injured vessel branches.
Epidural hematoma in the spine
Bleeding into the epidural space in the spine may also cause epidural hematoma. These may arise spontaneously (e.g. during childbirth, or as a rare complication of anaesthesia (such as epidural anaesthesia) or surgery (such as laminectomy).
The anatomy of the epidural space means that spinal epidural hematoma has a different profile from cranial epidural hematoma. In the spine, the epidural space contains loose fatty tissue, and the epidural venous plexus, a network of large, thin-walled veins. This means that bleeding is likely to be venous. Anatomical abnormalities and bleeding disorders make these lesions more likely.
They may cause pressure on the spinal cord or cauda equina, which may present as pain, muscle weakness, or bladder and bowel dysfunction.
The diagnosis may be made on clinical appearance and time course of symptoms. It usually requires MRI scanning to confirm.
The treatment is surgical decompression.
The incidence of epidural hematoma following epidural anaesthesia is extremely difficult to quantify; estimates vary from 1 per 10,000 to 1 per 100,000 epidural anaesthetics. This means that a typical anaesthetist or anesthesiologist is statistically unlikely to cause one in a whole career.
See also
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References
- ↑ Invalid
<ref> tag; no text was provided for refs named McCaffrey
Template:Cerebral hemorrhage
Template:Injuries, other than fractures, dislocations, sprains and strains
de:Hirnblutung
nl:Epidurale bloeding
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