RADIAL PULSE
Definition :: its is a wave of pulse on the arterial vessels wall generated as a result of expansion and elongation of the wall during ventricular systole and diastole ::
1. Anacrotic limb
2. Discrotic wave
3.Dicrotic notch
4. Predicrotic wave
5. postdicrotic wave
Sphygmographic Record:A graphic record of radial pulse can be obtained by tieing a small sphygmograph round the wrist
The upward wave shows a steep upward rise the Anacrotic limb showing the systolic wave The katacrotic downwards sloping wave shows the dicrotic wave Near its upper end is a dicrotic notch indicating the closure of the semilunar valves there are also pre and postdicrotic waves this is the normal tracing An abnormal diseased pulse indicating diseased heart shows an abnormal graph
Cross sectional area and flow velocity in the components of the vascular system
Blood vessels are elastic and have ability to contract through musular layer Resistance to blood -flow (peripheral resistance) is one of the important determinats for blood pressure in the systemic vascular system it is not only important to consider an individual vessel but also the entire network the resistance offered by blood vessels depends on various factors such as cross sectional area flow velocity and % of blood volume occupied All these factors have been described
Table relationship amongst per cent blood volume cross sectional area mean velocity and blood pressure in the systemic and pulmonary circuits
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