Blood Pressure

Blood Pressure

About Blood Pressure

Hypertension (HTN) or high blood pressure, sometimes called arterial hypertension, is a chronic medical condition in which the blood pressure in the arteries is elevated. This requires the heart to work harder than normal to circulate blood through the blood vessels. Blood pressure involves two measurements, systolic and diastolic, which depend on whether the heart muscle is contracting (systole) or relaxed between beats (diastole). Normal blood pressure at rest is within the range of 100-140mmHg systolic (top reading) and 60-90mmHg diastolic (bottom reading). High blood pressure is said to be present if it is persistently at or above 140/90_mmHg. Hypertension is classified as either primary (essential) hypertension or secondary hypertension; about 90_95% of cases are categorized as "primary hypertension" which means high blood pressure with no obvious underlying medical cause.

Contributions by Jfdwolff, Midgley, and Mito1970.

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