Home Forums Other Specialities Neurology & Neurosurgery Basic Facts about Stroke

Viewing 0 reply threads
  • Author
    Posts
    • #2922
      Anonymous
      Inactive

      What is a Stroke

      When blood flow to an area of the brain is cut off, brain cells in that area are deprived of oxygen and die. Depending on the area affected various permanent disability like paralysis of a limb, loss of memory or inability to speak can occur. If the area affected is large the person will have severe disability affecting many parts of the body. A massive stroke can also be fatal.

      Stroke Association UK reports that in the UK one stroke occurs every 3 minutes and 27 seconds. In USA it is the fifth leading cause of death. However no two strokes are the same. Recovery from a stroke differs from person to person. The ability to recover from a stroke depends on the severity of the stroke and how quickly you get treated. The quicker the treatment the better the recovery. Because every stroke is different, there is no set pattern for recovery.

      Symptoms of stroke
      • The face may be distorted and droop on one side. The person may not be able to smile.
      • Significant weakness of one arm. When asked to raise both arms together, one arm keeps dropping or not able to raise that arm.
      • Speech may be altered or slurred.

      Other less common symptoms may be:
      • Sudden severe headache that cannot be controlled by a pill.
      • Sudden blurring of vision
      • Suddenly becoming violent or confused
      • Numbness of a limb or part of the face with weakness
      • Sudden dizziness or becoming unconscious

      Any one of the signs above when present is probably a stroke and the person will need emergency medical treatment. Get them to the nearest hospital treating strokes. Make sure the hospital has access for an emergency scan. The sooner the diagnosis is confirmed and treatment begun the better the result.

      A stroke is a medical emergency and needs immediate medical attention.

      Types of Stroke:
      Ischaemic Stroke: When the blood vessel supplying an area of the brain is blocked by a cerebral embolism or a build-up of fatty plaque within the vessel wall, the blood supply to the area gets blocked and an “Ischaemic Stroke” results.

      Haemorrhagic Stroke:When a vessel supplying an area of brain ruptures leaking blood (burst aneurysm), the area is deprived of oxygen and “Haemorrhagic Stroke” results. Stroke can also result when there is pressure on an area of brain by a bulging blood vessel (aneurysm).

      Although a majority of stroke is an Ischaemic Stroke, if a haemorrhagic stroke is treated as you would an ischaemic stroke the result would be catastrophic as more blood would leak in to the area, causing more damage to the brain cells. According to the American Stroke Association 13% of strokes are haemorrhagic strokes.

      Therefore, before commencing treatment the type of stroke must be established.

      Investigation:

      Scan: To distinguish between Ischaemic and haemorrhagic stroke it is necessary to have a brain scan. The scan will confirm the type of stroke.

      Other Tests: Routine general examination of the patient must exclude atrial fibrillation as this may be the cause for an embolus. Blood tests must also check for high cholesterol.

      Treatment
      Once the type of stroke is confirmed, treatment should be started without delay. Effective and early treatment can prevent long-term disability. Treatment is usually non-surgical but some may need surgery.

      Non-Surgical Treatment:
      The aim of treatment in ischaemic stroke is to re-establish blood supply to the area of brain deprived of blood flow as soon as possible. This usually means getting rid of a blood clot that is obstructing the vessel.

      Alteplase also known as tPA is an injection that is given to dissolve the clot (thrombolysis). However, for it to be effective it must be given within 4 to 5 hours of a stroke. It is estimated that 1 in 7 patients benefit by this drug. As the majority of stroke is caused by a blood clot Alteplase has become a very useful drug in treating stroke.

      Blood thinning Drugs: In ischaemic stroke drugs like aspirin and clopidogrel should be considered.

      Other Drugs: To prevent further clots developing anticoagulants like heparin and warfarin may be given for varied lengths of time. Anticoagulants are particularly useful when you have an atrial fibrillation which could contribute to an embolus forming or when the patient is at risk of developing (or have had) a DVT.

      Statins: If the levels of triglycerides and cholesterol are high the patient should be advised Statins to lower the level. High cholesterol usually encourages the build up of lipid plaque within the lumen affecting blood flow to the brain (or heart).

      Antihypertensives: In haemorrhagic stroke high blood pressure must be controlled as it can cause an aneurysm in the brain to leak. If the patient is on anticoagulants, this must be stopped immediately.

      Surgical Treatment: Surgery in Stroke may be undertaken for a variety of reasons. The type of procedure will depend on the cause and type of stroke.

      Carotid endarterectomy: If the Ischaemic Stroke is caused by narrowing of the carotid artery (caused by deposition of plaque), the patient will require a surgical procedure to remove it (Carotid endarterectomy).

      In Hemorrhagic Stroke the types of surgery done will include clipping of aneurysm, coil embolization, and repair of arteriovenous malformation (AVM).

      Clipping of Aneurysm, Coil Embolization and Repair of Arterio Venous Malformation:
      Many of these procedures require opening the skull. There is now an attempt to treat some of these endoscopically. This is done by using a catheter introduced through the femoral artery in the thigh to reach the affected area in the brain.
      In the case of an aneurysm, stroke may result either from blood leaking from the aneurysm or by direct pressure of an expanding aneurysm on the brain cells.

      The treatment here would be to clip the aneurysm where it arises from the main vessel to block the blood entering it. This surgery helps prevent further blood leaking from the aneurysm. It can also help prevent an aneurysm from bursting again. During the procedure, the surgeon will place a tiny clamp at the base of the aneurysm.

      Coil embolization is a less complex procedure for treating an aneurysm. The surgeon will insert a catheter into the femoral artery in the groin. The catheter is then threaded to the site of the aneurysm. Then, a tiny coil will be pushed through the tube into the aneurysm. The coil will cause a blood clot to form, which will block blood flow through the aneurysm and prevent it from leaking blood or bursting again.

      Arteriovenous Malformation Repair: AVM is a tangle of malformed vessels where arteries and veins are connected in an abnormal manner. This may either rupture leaking blood in to the brain or by its bulge cause pressure on the brain. Here the AVM will need a repair. There are various ways of repairing an AVM. The methods include surgery toremove them, radiation to shrink them or injecting a substance to block them.

      Conclusion: Stroke is a major cause of disability and is now considered as the 5th leading cause of death. The majority of strokes are ischaemic in type and can be treated non surgically. The sooner the treatment is started the better the recovery.

      To identify and treat stroke remember – “FAST”.
      F = Facial weakness, A = Arm weakness, S = Speech altered and T= Timing of treatment determines speed of recovery.

      Ref: NHS Choice; American Stroke Association; National Heart Lung and Blood Institute

Viewing 0 reply threads
  • You must be logged in to reply to this topic.