Circulation During Exorcise with the Heart Rate Fixed Suppose that a patient wit

Question

Circulation During Exorcise with the Heart Rate Fixed Suppose that a patient with a fixed heart rate performs exercise (so that R_s in reduced) and suppose she manages to raise her stroke volume enough so that her mean arterial premier remains constant. What happens to the systolic, diastolic, and pulse pressures in this case? Cardiac Arrest Suppose that a patient has suffered cardiac arrest for a long enough time that his arterial blood pressure is essentially zero. (Estimate how long this will take using the exponential decay of the arterial pressure in the absence of heartbeats. To be specific, what is the "half-life" of the arterial pressure as it decays in the absence of heartbeats?) Then his heart suddenly recovers. Make the unrealistic assumption that T, Delta V_0, R_s, and C_sa immediately assume their normal values as given in Exercise 1.19. Calculate the arterial systolic and diastolic pressures on the first 10 beats. Plot the results in graph form.

Explanation / Answer

Mean atrial pressure: - average of systolic and diastolic pressure

Pulse pressure: - difference between systolic and diastolic pressure

Diastolic pressure: - measures peripheral resistance

Systolic pressure: - maximum atrial pressure

This is indicated that mean atrial pressure constant but due to more cardiac output atrial pressure increases. So in that conditions mean atrial pressure will shift to upper level however this is constant. Therefore the peripheral resistance (Diastolic pressure) should be reduced. Higher systolic and lower diastolic pressure increases the pulse pressure.

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