2008_Cardiovascular_fitness

2008_Cardiovascular_fitness - Heart Sounds Auscultation of...

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Heart Sounds
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Auscultation of Heart Sounds with the Stethoscope Sounds heard are the valves closing Auscultation-listening
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LUB - 1st heart sound - rise in intraventricular pressure - contraction of ventricles - closure of AV valves - blood pushed to pulmonary arteries( to lungs) and aorta ( to body)
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DUB - 2nd heart sound - decrease in intraventricular pressure - ventricles relax - atria contract - SL valves close - blood pushed from atria to ventricles
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Procedures: Pages 265-266 Clean earpieces with cotton swabs with alcohol With the diaphragm of the stethoscope: - Ist heart sound : best heard at fifth left intercostal space ( “bicuspid area on figure 7.21) - 2nd heart sound : 2nd intercostal space just to the right or to the left of the sternum ( “aortic and pulmonic area” on figure 7.21)
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Stethoscope Positions for Auscultation
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Relating heart sounds to Intraventricular pressure and volume
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Compare heart sounds during 1. Quiet breathing 2. Slow and deep inhalation 3. Slow exhalation Complete table on page 269 Homework- Answer questions on pages 270-271
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Measurements of Blood Pressure
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Physical laws governing the movement of fluids through pipes Influence blood flow and blood pressure Blood Flow Velocity
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The velocity of blood flow varies in the circulatory system > Slowest in the capillary beds as a result of the high resistance and large total cross-sectional area 1 5,000 4,000 3,000 2,000 1,000 0 Aorta Arterie s Arterioles Capillarie Venules Veins 20 0
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2008_Cardiovascular_fitness - Heart Sounds Auscultation of...

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