Blood flows through blood vessels with a certain pressure. In a healthy human, the pressure with which the blood flows is normal but if the pressure increases, it can lead to a chronic condition called ‘hypertension’. Thus, hypertension is the severe condition in which the blood flows at a pressure much higher than the normal limit.
Hypertension is also referred to as ‘high blood pressure’ and sometimes also known as ‘silent killer’. Normally, blood pressure rises beyond the normal limit when a person does any physical activity such as exercise, playing sports, etc. Such rise in pressure gradually becomes normal with time. But if the pressure remains high for a very long time then it becomes very important for the person to consult a doctor.
High blood pressure is generally measured as systolic pressure and diastolic pressure. The systolic pressure is the pressure with which the blood flows across the blood vessels when the heart is in its contracting state and its normal limit is 120mmHg.
The diastolic pressure is the pressure with which the blood is filled in the heart when it is in its relaxed phase and its normal limit is 90mmHg.
According to the American Heart Association (AHA), hypertension is classified into following categories:
Prehypertension is the condition in which slight increase in both the systolic and diastolic pressure is observed. The systolic pressure limit for prehypertension is between 120mmHg and 139mmHg and for diastolic pressure the limit is between 80mmHg to 89mmHg.
In this stage, the systolic pressure ranges from 140mmHg to 159mmHG and the diastolic pressure ranges from 90mmHg to 99mmHg.
In this stage, the systolic pressure reaches to 160mmHg and diastolic pressure reaches 100mmHg.
Hypertensive crisis is the condition in which the systolic pressure reaches the limit of 180mmHg and diastolic pressure reaches the limit of 110mmHg.
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