Silent Stroke
When a person suffers a stroke that is not characterized by any outward symptoms, it is a silent stroke. Often even the patient is not aware of it. A silent stroke usually affects those areas of the brain that deal with thought process and mood regulation. A silent stroke damages a few cells in the brain, which are likely to die over time. A link between depression and silent stroke has been noticed. They are both indicative of reduced blood supply to the brain.
A silent stroke can cause damage to the brain and can be a precursor to a major stroke or transient ischemic attack. Hypertension, atrial fibrillation and smoking are the major triggers for a silent stroke. Elevated levels of total homocysteine or acrolein is a risk factor for a silent stroke. Untreated diabetes can also lead to a silent stroke. A silent stroke episode is usually detected through an MRI can it usually causes lesions that are visible during imaging.
A silent stroke can occur in different ways:
Ischemic stroke: This kind of stroke is the one that most patients suffer when there is blockage of blood supply to the brain due to impaired blood vessels.
Hemorrhagic stroke: This kind of stroke occurs when a blood vessel carrying blood to the brain gets weak and ruptures. Aneurysms are examples of a condition leading to a stroke.
Studies have proved that persons engaging in moderate or intensive exercise on a regular basis had far lesser chance of experiencing a silent stroke.
Heat Stroke
Heat stroke is a condition where the body temperature rises beyond 40.6 °C (105.1 °F) and the natural body cooling mechanism fails. Also called sunstroke, thermic fever, or siriasis, heat stroke can become a potentially dangerous condition if not treated. High body temperature plays havoc on the brain and other internal organs. Dehydration can lead to very low blood pressure. Symptoms of heat stroke include nausea, headache, muscle cramps, disorientation and seizures. Dehydration and hyperthermia results. Symptoms such as dehydration and excessive sweating are indicative of heat exhaustion and can lead to a heat stroke. A person suffering heat stroke symptoms must rest in a cool area and rehydrate with electrolyte drinks and water. A cool bath helps to alleviate some of the heat.
Transient Ischemic Attack
Transient Ischemic Attack or TIA occurs when there is a brief impairment in blood flow to the brain. This results in stroke-like symptoms such as dizziness, confusion, clumsiness, lack of coordination and difficulty in reading, writing or recognizing people. The patient might experience trouble speaking and understanding speech. There might be slurred speech and dimming of vision. A TIA is different from a stroke in that it does not cause death of brain tissue. Besides, the blockage dissolves soon.
Typical reasons for a transient ischemic attack are blood clots, high blood pressure, diabetes, atrial fibrillation and high cholesterol. Several tests can help diagnose if a person has suffered a transient ischemic attack. Irregular blood flow can be detected by an abnormal sound (bruit) that is noticed with a stethoscope. ECG or angiogram is done to check where the blood flow is blocked. Blood pressure is likely to be very high. The source of atherosclerosis is usually identified with an ultrasound. Aspirin might be prescribed to reduce blood clotting. Other conditions such as hypertension, diabetes and cholesterol need to be treated.
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