Vascular myelopathy


Vascular myelopathy
Vascular myelopathy
Classification and external resources
ICD-10 G95.1
ICD-9 336.1

Vascular myelopathy (vascular disease of the spinal cord) refers to an abnormality of the spinal cord in regards to its blood supply.[1] The blood supply is complicated and supplied by two major vessel groups: the posterior spinal arteries and the anterior spinal arteries—of which the Artery of Adamkiewicz is the largest.[2] Both the posterior and anterior spinal arteries run the entire length of the spinal cord and receive anastomotic (conjoined) vessels in many places. The anterior spinal artery has a less efficient supply of blood and is therefore more susceptible to vascular disease. Whilst atherosclerosis of spinal arteries is rare, necrosis (death of tissue) in the anterior artery can be caused by disease in vessels originating from the segmental arteries such as atheroma (arterial wall swelling) or aortic dissection (a tear in the aorta).[3]

Contents

Spinal cord infarction

Anterior spinal artery syndrome

Anterior spinal artery syndrome is necrosis of tissue in the anterior spinal artery or its branches.[4] It is characterised by pain which radiates at onset and sudden quadraplegia (paralysis of all four limbs) or paraplegia (paralysis of the lower body). Within days, flaccid limbs become spastic and hyporeflexia (underactive nerve responses) turns into hyperreflexia (overactive nerve responses) and extensor plantar nerve responses. Sensory loss to pain and temperature also occurs up to the level of damage on the spinal cord, as damage to different areas will affect different parts of the body.[3]

In diagnosis, other causes of abrupt paralysis should be excluded such as cord compression, transverse myelitis (infection of the spinal cord) and Guillain-Barré syndrome. A specific cause of the infarction should be looked for, such as diabetes, polyarteritis nodosa (inflammatory damage of vessels) or systemic lupus erythematosus. Neurosyphilis is also a known cause. Other causes include:[3]

Type of disease Causes
Small blood vessel Diabetes, polyarteritis nodosa, systemic lupus erythematosus, neurosyphilis
Arterial compression or occlusion Extradural tumors, aortic dissection, disk fragmentation, aortic surgery
Embolic occlusion Decompression sickness, aortic arteriography
Hypotensive Myocardial infarction

Treatment is supportive and aims to relieve symptoms. The prognosis is dependant upon individual circumstances and factors.[3]

Posterior spinal artery syndrome

Posterior spinal artery syndrome is much rarer than its anterior counterpart as the white matter structures that are present are much less vulnerable to ischemia since they have a better blood supply. When posterior spinal artery syndrome does occur, dorsal columns are damaged and ischemia may spread into the posterior horns. Clinically the syndrome presents as a loss of tendon reflexes and loss of joint position sense.[3]

Transient ischemic attack

Transient ischemic attacks (TIAs) rarely affect the spinal cord and usually affect the brain; however, cases have been documented in these areas. Spinal ateriovenous malformations are the main cause and are represented later in this article. That said, TIAs can result from emboli in calcific aortic disease and aortic coarctation.[3]

Spinal arteriovenous malformations

Spinal arteriovenous malformations (AVMs, or angiomatous malformations) are congenital (from birth) abnormalities of blood vessels. Arteries that directly communicate with veins bypass the capillary network (which has not yet developed) and thus creates a shunt. AVMs appear as a mass of convoluted, dilated vessels. In regards to the spinal cord, they are usually located in the thoracolumbar region (between the thoracic and lumbar regions, 60% of the time), as opposed to the upper thoracic (20%) and cervical regions (approximately 15%). Cervical malformations arise from the anterior spinal artery and lie within the cord, whereas thoracolumbar malformations can be internal, external or encompass both areas of the cord.[3]

Malformations can be recognised as part of an acute illness or gradual onset disease. In diseases such as subarachnoid hemorrhage, signs and symptoms include headache, neck stiffness and back and leg pain. Extradural, subdural and intramedullary hematomas are all signs of acute cord compression. Gradual onset diseases are more common (85-90% of all diseases leading to a diagnosis of malformation) and are usually due to an increased venous pressure. Other factors such as thrombosis or arachnoiditis can be involved. A bruit (unusual blood sounds) may be head overlying the spinal arteriovenous malformation. Very occasionally, nevus (moles) or angiolipomas are found.[3]

Myelography is used to confirm the diagnosis of AVMs and it shows 'snake-like' vessels on the cord's surface. If the myelogram is positive, angiography is required to show the extent of malformation and the exact site of the shunt. Magnetic resonance imaging (MRI) may show the appropriate area. If AVMs are left untreated, 50% of patients with gradual symptoms will be unable to walk within 3 years of onset. Operations can prevent progression and may improve any gait or incontinence.[3]

References

  1. ^ Caragine LP, Halbach VV, Ng PP, Dowd CF (June 2002). "Vascular myelopathies-vascular malformations of the spinal cord: presentation and endovascular surgical management". Semin Neurol 22 (2): 123–32. doi:10.1055/s-2002-36535. PMID 12524557. http://www.thieme-connect.com/DOI/DOI?10.1055/s-2002-36535. Retrieved 2008-06-15. 
  2. ^ Milen MT, Bloom DA, Culligan J, Murasko K (1999). "Albert Adamkiewicz (1850-1921)--his artery and its significance for the retroperitoneal surgeon". World journal of urology 17 (3): 168–70. doi:10.1007/s003450050126. PMID 10418091. 
  3. ^ a b c d e f g h i Lindsay, Kenneth W; Ian Bone, Robin Callander, J. van Gijn (1991). Neurology and Neurosurgery Illustrated. United States: Churchill Livingstone. pp. 403–407. ISBN 0-443-04345-0. 
  4. ^ Manconi M, Mondini S, Fabiani A, Rossi P, Ambrosetto P, Cirignotta F (December 2003). "Anterior spinal artery syndrome complicated by the ondine curse". Arch. Neurol. 60 (12): 1787–90. doi:10.1001/archneur.60.12.1787. PMID 14676058. http://archneur.ama-assn.org/cgi/pmidlookup?view=long&pmid=14676058. Retrieved 2008-12-28. 

See also


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Myelopathy — Classification and external resources ICD 10 G95 ICD 9 336.9 …   Wikipedia

  • Peripheral vascular disease — Classification and external resources ICD 10 I73.9 …   Wikipedia

  • Migraine — This article is about the disorder. For other uses, see Migraine (disambiguation). Migraine Classification and external resources The pain of a migraine headache can be debilitating. ICD 10 …   Wikipedia

  • Headache — For other uses, see Headache (disambiguation). Headache A person with a headache. ICD 10 G43 G …   Wikipedia

  • Cerebral hypoxia — For other uses, see hypoxia (disambiguation). Cerebral hypoxia Classification and external resources Circle of Willis Arteries beneath brain ICD 9 …   Wikipedia

  • Multiple sclerosis — Classification and external resources Demyelination by MS. The CD68 colored tissue shows several macrophages in the area of the lesion. Original scale 1:100 ICD …   Wikipedia

  • Dementia with Lewy bodies — Classification and external resources Lewy bodies are the pathophysiological characteristic of the disease ICD 10 G …   Wikipedia

  • Cluster headache — Classification and external resources The Cluster Headache by JD Fletcher ICD 10 G44 …   Wikipedia

  • Cerebral edema — Classification and external resources Edema (darker areas) surrounding a secondary brain tumor. ICD 10 G …   Wikipedia

  • Hepatic encephalopathy — Classification and external resources Micrograph of Alzheimer type II astrocytes, as may be seen in hepatic encephalopathy. ICD 10 …   Wikipedia


We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.