2 Arterial Press and CO copy

2 Arterial Press and CO copy - Arterial Blood Pressure and...

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Unformatted text preview: Arterial Blood Pressure and Cardiac Output Function- Arterial vessels distribute blood to capillary beds. The arterial pressure (i.e., gradient) is the direct determinant of ow through the capillaries. About 10% of the blood is in the arterial system, high pressure, low capacitance . The rest is in the veins, a low pressure, high capacitance reservoir. Arterial System The Windkessel Effect Because of the elasticity of arteries, the pressure does not drop all the way to zero during diastole . This preserves pressure in the arteries so that perfusion of the capillaries is more continuous. How does this happen? Arterial pressure WITHOUT elasticity . Arterial pressure WITH elasticity . Mechanism of Windkessel Effect Arterial Pressure Wave Form Blood Pressure Measurement Direct (most accurate) - Catheter inserted in artery and continuous pressure wave form recorded through time. (see previous) Indirect- Sphygmomanometer : A pressure cuff placed on the arm and using a stethoscope and a measuring gauge indicates systolic and diastolic pressures only (not continuous; cant see wave form) ( Eg. - 120 / 80 mm/Hg) Systemic arterial pressure is critical and...
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2 Arterial Press and CO copy - Arterial Blood Pressure and...

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