regulation of cardiac out put
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regulation of cardiac out put
- 1. Addis Ababa University Collage of Health Science Department of Physiology By : Robel Abay September 19 09/30/11 Regulation of cardiac out put
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- 19. Increase in preload 09/30/11
- 20. Increased after load 09/30/11
- 23. Factors Affecting End-diastolic Volume Ventricular EVD Ventricular performance Total blood volume Body position Intrathoracic pressure Atrial contrib. to vent. filling Pumping action to skeletal muscle Venous tone Intrapericardial pressure ventricular compliance STRETCHING OF MYOCARDIUM 09/30/11
- 24. Preload vs Afterload Venules / veins Arterioles Capacitance vessels Resistance vessels Affect preload Affect afterload 09/30/11
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- 31. Effect of Bainbridge and Baroreceptor Reflex on HR Intravenous infusion Increased right atrial pressure Stimulate atrial receptors Bainbridge reflex Increased cardiac output Increased arterial pressure Baroreceptor reflex Heart rate 09/30/11
- 32. C. Humoral regulation HR/CO INSULIN THYROID GLUCAGON CATECHOLAMINES STEROIDS POTENTIATION
- 33. CARDIAC OUTPUT HEART RATE MYOCARDIAL CONTRACTILITY PRELOAD AFTERLOAD CARDIAC FACTORS COUPLING FACTORS 09/30/11
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- 36. Thank you
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- Humoral regulation refers to the effect of hormones in the heart and how hormones that are released into the bloodstream under certain physiological states may regulate cardiac function. Catecholamines released from the adrenal medulla increase the dP/dt of the heart. This effect is potentiated by steroid hormones. Calorigenic hormones like insulin, glucagon and thyroxine also increase cardiac contractility. Thyroxine produces a permissive effect on the action of catecholamines. In hypothyroidism the effect of catecholamines in the heart is depressed by the absence of thyroxine.
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