Vascular distensiblity

1. Vascular Distensiblity
Dr. Sara Sadiq
(MBBS, M.Phil)

2. Distensibility
• Ability to accommodate the pulsatile output of the heart.
• Veins are 8 times more distensible then arteries because of
thin walled.
• Vascular distensibility = Increase in volume
Increase in Pressure X Orignal Volume

4. Vascular Compliance (Vascular capacitance)
• Vascular compliance = Increase in volume
Increase in pressure
• Compliance is equal to distensibility times volume
• Usually more important to know the total quantity of blood

8. Arterial Pressure Pulsation
• Systolic Pressure  Pressure at top of each pulse
• Diastolic Pressure  pressure at bottom of each pulse
• Pulse Pressure  Difference between systolic and diastolic pressure

9. Arterial Pressure Pulsation
• Pulse Pressure  depends on two major factor
a) Stroke volume output
b) Compliance (total distensiblity)
• Pulse Pressure = Stroke volume
Arterial compliance

12. Arterial blood pressure

14. Mean Arterial Pressure
• Mean arterial pressure is a balance
between blood flow into the arteries
and blood flow out of the arteries
• Blood flow in is equal to the cardiac
output
• Influenced primarily by the vascular
resistance
• MAP  CO X Resistance

15. Thank You