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Blood Pressure

Hypertension – High Blood Pressure, Animation

junio 16, 2018

[VidSitePro id=52 ]Blood pressure is the force the circulating blood exerts on the walls of blood vessels it is different in different types of vessels but the term blood pressure when not specified otherwise refers to arterial pressure in the systemic circulation when the heart contracts and pumps blood into the aorta during systole the aortic pressure rises and so does the systemic arterial pressure the maximum pressure following an ejection is called the systolic pressure in between heartbeats when the ventricles refill blood pressure Falls to its lowest value called the diastolic pressure these are the two numbers on a blood pressure reading blood pressure normally shows a daily pattern and is usually lower at night during daytime it fluctuates with physical activities and emotional states hypertension refers to a persistent high blood pressure in the u.s. high blood pressure used to be defined as greater than 140 over 90 but recent guidelines have changed these values to 130 over 80 to better prevent and treat the condition normal blood pressure is below 120 over 80 in practice blood pressure is considered too low only if it produces symptoms hypertension does not cause symptoms on its own but it slowly damages blood vessels and in the long term is a major risk factor for a variety of cardiovascular diseases such as stroke aneurysm and heart attack as well as end organ damage such as renal failure or vision loss for this reason hypertension is known as the silent killer hypertension can be classified as primary or secondary with the former being responsible for over 90% of cases primary hypertension has no apparent cause and may develop as a result of old age obesity high salt diet lack of exercise smoking and drinking most commonly the blood vessels are hardened with age or on hill the diets making it harder for blood to flow secondary hypertension on the other hand is caused by an underlying condition many conditions and factors can cause hypertension most notable are kidney problems and endocrine disturbances regardless of the cause the increase in blood pressure is produced by either an increase in vascular resistance narrower or stiffer blood vessels or an increase in cardiac output larger volume of blood pumped out by the heart these two factors are the targets of antihypertensive drugs treatments must start with lifestyle changes such as healthy low sodium diets physical exercise and stress management on top of that anti hypertensive agents may be used to control hypertension these include vasodilators these drugs dilate blood vessels thereby decreasing vascular resistance and reducing blood pressure diuretics diuretics promote sodium and water removal by the kidneys and thereby decrease blood volume drugs that decrease cardiac output by decreasing heart rate or contractility may also be used to treat hypertension you

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