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HEMODYNAMICS

HEMODYNAMICS. TYPES OF BLOOD FLOW RESISTANCE TO BLOOD FLOW SHEAR STRESS CAPACITANCE (COMPLIANCE) VISCOSITY CRITICAL CLOSING PRESSURE VELOCITY OF BLOOD FLOW. OHM’S LAW:. Definition:. Pressure ( P ). Flow =. Resistance ( R ). Q. A. DEFINITIONS:. 1) Blood flow (cm 3 /sec):.

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HEMODYNAMICS

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  1. HEMODYNAMICS

  2. TYPES OF BLOOD FLOW • RESISTANCE TO BLOOD FLOW • SHEAR STRESS • CAPACITANCE (COMPLIANCE) • VISCOSITY • CRITICAL CLOSING PRESSURE • VELOCITY OF BLOOD FLOW

  3. OHM’S LAW: Definition: Pressure ( P ) Flow = Resistance ( R )

  4. Q A DEFINITIONS: 1) Blood flow (cm3/sec): 2) Velocity (V) of blood flow (cm/sec): V = Q–Blood flow A–Total cross sectional area 3) Resistance to blood flow: P1 – P2 (mmHg) Q (mL/sec) PRU =

  5. Blood flow is the quantity of blood that passes a given point in the circulation in a given period of time. Unit: mL/min or L/min

  6. TYPES OF BLOOD FLOW: I. LAMINAR (STREAMLINE) FLOW: II. TURBULENT FLOW:

  7. STREAMLINE FLOW

  8. ρDV Reynold’s No (Re): Re = η • Diameter of vessel (D): • Viscosity of fluid (η): • Velocity of flow (V) : • Density of fluid (ρ): Factors affecting Turbulent flow:

  9. TURBULENT FLOW Effect of constriction: Upstream Laminar

  10. TURBULENT FLOW Effect of constriction: Upstream High velocity Laminar

  11. TURBULENT FLOW Effect of constriction: Upstream High velocity Laminar

  12. TURBULENT FLOW Effect of constriction: Turbulent Upstream High velocity Laminar

  13. TURBULENT FLOW Effect of constriction: Turbulent Upstream High velocity Laminar Laminar

  14. A O R TURBULENT FLOW Effect of constriction: Turbulent Upstream High velocity Laminar Laminar A A Velocity R

  15. LAMINAR FLOW TURBULENT FLOW Nature of flow: Velocity of flow: Reynold’snumber: Association of sound:

  16. RESISTANCE TO FLOW • IF THE PRESSURE DIFFERENCE BETWEEN TWO POINTS IS 1 mm Hg AND THE FLOW IS 1mL/min, THEN TPR = 1 PRU • RESISTANCE TO BLOOD FLOW IN SERIES AND PARALLEL CIRCUIT

  17. CONDUCTANCE • IT IS THE RECIPROCAL OF RESISTANCE • UNIT IS mL/sec/mm Hg • Conductance is α diameter4

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