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Understanding Hemodynamics: Types, Resistance, and Flow Rates

Explore the basics of hemodynamics including types of blood flow, resistance, shear stress, and velocity. Learn about capacitance, viscosity, and the critical closing pressure in blood circulation. Discover Ohm's Law in blood flow dynamics.

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Understanding Hemodynamics: Types, Resistance, and Flow Rates

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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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