High blood pressure or arterial hypertension is a pathological condition in which the arteries reigns high blood pressure, or systolic pressure over 140 mm Hg, and a diastolic pressure above 90 mm Hg.
Hypertension
Commonly increased both systolic and diastolic pressure simultaneously. But there are cases where increased only systolic or diastolic pressure only. Then it comes to convergent type of hypertension. If systolic pressure is elevated, and decreased diastolic talking about divergent type of hypertension.
WHO classification of hypertension by blood pressure level in adults over 18 years
Blood pressure is the "strength" because of the blood that continued to move through the blood vessels. It depends on the volume of blood the heart pumps per minute and peripheral vascular resistance that encountered in moving blood through the blood vessels. If the heart pumps more blood volume (increased output), and / or the lumen of the arteries decreased (increased peripheral vascular resistance), blood pressure increases, ie arterial hypertension occurs.
Arterial hypertension is a complex and multifactorial disease with mosaic mechanism of occurrence and in most cases the cause of the outbreak is unknown or can not be explained by a patomehanizam applies to all patients, and this type of hypertension is called primary or essential hypertension .
A small number of cases (less than 5%) causes of high blood pressure are known and this type of hypertension is called secondary or symptomatic hypertension . These include renal, endocrine, cardiovascular, neurogenic hypertension and hypertension-specific pregnancy.
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