9 VA dissection is another important cause (20%-30%) of both LMI and MMI 8 and should be suspected in the context of neck pain and medullary symptoms, particularly in young patients. ![]() 8Ītherosclerosis of the VA and its branches is the most common cause of MI. Lateral MIs (LMIs) are 3-4 times more common than medial MIs (MMIs) there is a 3:1 male predominance. MIs account for 7% of all ischemic brainstem strokes. 5 Several risk factors are associated with this condition, including hypertension, fibromuscular dysplasia, 6 trauma, and spinal manipulation.īilateral distal vertebral occlusions cause low flow in the posterior circulation, leading to Medullary Infarction (MI) ![]() VA dissection is an increasingly described cause of brainstem infarct in patients younger than 45 years. Occlusion of the VA and its branches often occurs secondary to dissection or atherosclerosis and usually causes infarction in the medulla or inferior cerebellum. The anteromedial group arteries originate from the anterior spinal artery (ASA) caudally and the vertebral artery (VA) cranially the anterolateral group arteries also arise from the ASA and VA the lateral group arteries arise from the posterior inferior cerebellar artery and the posterior group arteries arise from the posterior spinal artery.Īt the level of the pons, we can differentiate 3 intrinsic Etiology Double vision and vertigo usually resolve after several weeks of recovery in mild to moderate brain stem strokes.At the level of the medulla oblongata, 4 territories may be differentiated (Fig. Because brain stem strokes do not usually affect language ability, the patient is often able to participate more fully in rehabilitation. There are also rare causes, like injury to an artery due to sudden head or neck movements. Similarly, brain stem strokes can be caused by a clot or a hemorrhage. Risk factors for brain stem stroke are the same as for strokes in other areas of the brain: high blood pressure, diabetes, heart disease, atrial fibrillation and smoking. Whether a survivor has minor or severe deficits depends on the location of the stroke within the brain stem, the extent of injury and how quickly treatment is provided. Like all strokes, brain stem strokes produce a wide spectrum of deficits and recovery. Patients should receive treatment as soon as possible for the best recovery. If a stroke in the brain stem results from a clot, the faster blood flow can be restored, the better the chances for recovery. More severe brain stem strokes can cause locked-in syndrome, a condition in which survivors can move only their eyes. ![]() Brain stem strokes can impair any or all of these functions. All motor control for the body flows through it. Only a half-inch in diameter, the brain stem controls all basic activities of the central nervous system: consciousness, blood pressure and breathing. A brain stem stroke can also cause double vision, slurred speech and decreased consciousness. The symptoms of vertigo dizziness or imbalance usually occur together dizziness alone is not a sign of stroke. A person may have vertigo, dizziness and severe imbalance without the hallmark of most strokes - weakness on one side of the body. ![]() Brain stem strokes can have complex symptoms, and they can be difficult to diagnose.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |