SAR HS 342 Lecture Notes - Lecture 10: Abdominal Cavity, Afterload, Inotrope
31 Dec 2018
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Document Summary
Sv regulation: pre-load: degree of stretch in cardiac muscle. Pulse pressure = systolic bp diastolic hp. Blood flow increases as pressure increases; blood flow decreases as pressure decreases: blood flow and blood pressure are directly proportional. Blood flow increases as resistance decreases; blood flow decreases as resistance increases: blood flow and resistance are indirectly proportional. Blood flow increases in working muscle; blood flow decreases in inactive organs. Metabolic activity activates arterioles to promote blood flow. Central command theory: signals from higher brain to drive cardiovascular system: heart mechanoreceptors, muscle mechanoreceptors: muscle metabolites, muscle chemoreceptors: force/movement speed of limbs, baroreceptors: changes in pressure. Decrease in hr, sv, co (close to rest levels) Hr and cardiac output: linearly increases with work rate: plateau at 100% vo2 max. Bp: map increases linearly: sbp increases, dbp constant. Hr: increases linearly until max: adults: 220 age; children: 208 (0. 7 x age) Strove volume: increases: plateaus at 40% vo2 max.
