Arterial System. Lecture Block 10
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1 Lecture Block 10 Vascular Structure/Function
2 Functional Overview Vessel Structure Diameter Aorta 25 mm Artery 4 mm Vein 5 mm Vena Cava 30 mm Arteriole 30 µm Capillary 8 µm Venule 20 µm Wall thickness 2 mm 1 mm 0.5 mm 1.5 mm 6 µm 0.5 µm 1 µm Endothelium Elastic tissue Smooth Muscle Fibrous Tissue
3 Factors: age athersclerosis Effects more pulsatile flow more cardiac work not hypertension Laplace s Law (thin-walled cylinder): T = wall tension P = pressure r = radius For thick wall cylinder P = pressure σ = wall stress r = radius w = wall thickness Aortic Compliance T = Pr = Pr w Blood Volume [%] C = dv dp Pressure [mm Hg] Tension [dyne/cm] Wall Stress [dyne/cm 2 ] Aorta 2 x x 10 5 Capillary x yrs yrs yrs yrs Arterial Hydraulic Filter
4 as Hydraulic Filter Pulsatile --> smooth flow Cardiac energy conversion Reduces total cardiac work Cardiac Output Cardiac Output t t Arterial Pressure t Arterial Pressure t Physiological Ideal Pulsatile Challenge Cardiac Output t Arterial Pressure t Filtered Reality Elastic Recoil in Arteries
5 Effects of Vascular Resistance and Compliance Cardiac Output vs. Runoff Arterial Pressure/Flow
6 Basic Pressure Equations Mean arterial pressure: which we can approximate as with! P s = systolic pressure! P d = diastolic pressure Total peripheral resistance is with! P a = mean arterial pressure! P ra = right atrial pressure! Q r = runoff flow into veins (=Q h at equilibrium) If we assume P ra =0 Time Course of Arterial Flow We can estimate change in arterial volume as: Cardiac output Runoff flow Arterial volume change (1) Arterial compliance we define as (2) Which we differentiate w.r.t time to get (3) Substituting (1) into (3), we get (4) or (5)
7 Arterial Pressure Response to Cardiac Output Stable pressure determined by flow and peripheral resistance Increase in CO or R p both increase pressure Pressure always changes to force CO to equal runoff flow Compliance affects rate but not final values Arterial Pressure P 1 Increase in Q h (CO) or R p Small Compliance Large Compliance P 2 Time Pressure and Age (Compliance) Mean Pressure Pressure
8 Peripheral Pulse Pressure Pressure wave velocity vp = k/c vp increases along the arteries and with age Pressure wave pulse amplitude grows with distance from heart reflection/superposition decrease in C dispersion Venous System
9 Venous System Venous volume Large volume, low pressure system Reservoir of blood (50% of total volume) Blood loss covered by venous system Vasoconstriction, drinking (blood doning) Venous flow Skeletal muscle activity Valves Breathing Paristaltic contractions in venules Venous Valves Muscle pump Unidirectional flow Vericose veins
10 Measurement Measuring Blood Pressure: Catheters Liquid column and external manometer frequency response of transducer and fluid column calibration and zeroing motion artifacts Manometer-tipped catheters higher frequency response less motion artifact
11 Auscultatory Blood Pressure Method Effect of arm position Alternate measurement locations (leg) Pressure varies during the day (lowest during sleep) Psychological bias in measurements (in subject and operator) Automated Pressure Measurement Ausculatory Oscillometric
12 Measuring Blood Flow Ultrasound flowmeter (velocity) Electromagnetic flowmeter (velocity) Thermal dilution Functional MRI (diffusion or oxygenation) Measuring Blood Flow II Bioelectric impedance (plethysmography) Light (pulse oxymetry) Finger artery Bone Lightproof casing To device Elastomer ring
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