![]() if a dog is taking a medication that can cause syncope as a side effect. Certain brain and spinal cord disorders, prolonged bed rest, and certain drugs (particularly those used to treat high blood pressure) can interfere with this compensation and lead to fainting when standing up Dizziness or Light-Headedness When Standing Up In some people, particularly older people, blood pressure drops excessively when they sit or stand up (a condition called orthostatic or postural hypotension). Syncope (or fainting) is defined as a temporary loss of consciousness that. If the body does not compensate in these ways, light-headedness is common and fainting may rarely occur. Often no cause for high blood pressure can be identified, but sometimes it occurs as a result of an underlying. Normally, the body quickly increases the heart rate and constricts blood vessels to maintain blood pressure The Body's Control of Blood Pressure High blood pressure (hypertension) is persistently high pressure in the arteries. After-effects are usually brief following a vasovagal faint. Vomiting and diarrhea, specifically, stimulate the vagus nerve. There are many causes of dehydration, including vomiting or diarrhea, heat exhaustion, and burns. ![]() Be sure to sit down right away, even on the ground. Talk to your health care provider if you faint more than once. Too little water in the bloodstream lowers blood pressure, and stimulating the vagus nerve when the system is already low can lead to dizziness and fainting. If you feel faint after you donate, notify the nurse immediately. Therefore, treat loss of consciousness as a medical emergency until the symptoms are relieved and the cause is known. ![]() Or the cause can be a serious disorder, occasionally involving the heart. Sitting or standing up too quickly can cause fainting, because the change in position causes blood to pool in the legs, resulting in a fall in blood pressure. Blood pressure in orthostatic hypotension approaches a stable level after a variable time. Fainting might have no medical significance. ![]()
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