QS Study

Types of Blood Pressure

Blood pressure is the lateral pressure exerted by blood in per unit area of vessel wall while flowing through it. It is the force that moves blood through our circulatory system. It is a vital force because oxygen and nutrients would not be pushed around our circulatory system to nourish tissues and organs without blood pressure.

Blood pressure = Cardiac output x total peripheral resistance.

Type of Blood Pressure

  1. Systolic pressure
  2. Diastolic pressure
  3. Pulse pressure
  4. Mean pressure

(i) Systolic pressure: It is the maximum pressure during systole. It is about 110-140 mm of Hg (Average 120 mm of Hg).

(ii) Diastolic pressure: It is the maximum pressure during diastole. It is about 60-90 mm of Hg (Average 80 mm of Hg)

Fig: Blood pressure Range

(iii) Pulse pressure: It is the difference between systolic and diastolic pressure it is about 30-40 mm of Hg.

(iv) Mean pressure (MP): It is the diastolic pressure plus one third (1/3) of pulse pressure MP = DP + 1/3 PP It is about 78-98 mm of Hg. (Average 96 mm of Hg)

Additional information on mean pressure

The pressure falls very slightly in the large and medium-sized arteries because their resistance to flow small, but it falls rapidly in the small arteries and arterioles, which are the main sites of the peripheral resistance against which the heart pumps. The mean pressure at the end of the arterioles is 30 – 38 mmHg.

N.B.- 1mm of Hg = 0.133 KPa

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