17 Heart and Circulation V

Compression of the neck region above carotid sinuses

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: Compression of the neck region above carotid sinuses can lead to significant reductions of heart rate and blood pressure, and cause unconsciousness
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Hemorrhagic and Postural Hypotension
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Hemorrhagic and Postural Hypotension Hemorrhagic Hypotension : Loss of blood volume causes decrease in preload, decrease in stroke volume, and hypotension Postural Hypotension : Prolonged standing leads to venous pooling, loss of circulating blood volume, decrease in preload, decrease in stroke volume, and hypotension
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Hemorrhage-Induced Hypotension
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Stroke Volume During Hemorrhage: Frank-Starling’s Law of the Heart End-Diastolic Volume (Preload) Stroke Volume Hemorrhage Normal Concept : Normal circulating blood volume is important for maintaining normal end- diastolic volume for ventricular ejection of stroke volume to the circulation
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Compensatory Response to Hemorrhage Through Sympathetic Stimulation Cardiac Output = Stroke Volume x Heart Rate Compensatory Response: Sympathetic Stimulation Vascular Effects : Selective vasoconstriction in skin, gut, and kidney, leading to increase in total peripheral resistance and stabilization of blood pressure. Primary Problem: Blood Volume and EDV) Cardiac Effects ( HR and Contractility) (-) (+) (+)
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Compensation for Dilation in One Bed by Constriction in Others
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Interstitial Fluid Reabsorption as a Compensatory Mechanism in Response to Hemorrhage
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Summary of Cardiovascular Effects of Hemorrhage
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