PSIO 532 Study Guide - Midterm Guide: Orthostatic Intolerance, Vascular Resistance, Renal Function

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26 May 2018
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PSL Cardiovascular System
Long Term Control of Blood Pressure
The mechanisms mediating long term control of
blood pressure remain unclear. One hypothesis is
that long term regulation of blood pressure occurs
via changes in blood volume (via changes in the
rate of urine formation) induced by changes in
blood pressure. Figure 32 gives an example of the
interaction between short term and long term factors. With an increase in arterial pressure,
baroreflex reductions in total peripheral resistance (TPR) and cardiac output (CO) occur (short
term responses). Over time, the increase in arterial pressure increases glomerular filtration
rate and thus urine formation (pressure diuresis). The increased urine flow decreases blood
volume which helps restore blood pressure back to normal levels. Long term control of blood
pressure is really long term control of renal function. Hypertension that occurs, progressive
decrease, is lot of people that is due to deficit is renal function. hence one of the
medications for hypertension is to put them on water pills (diuretics) in order to decrease
their blood volumes, and therefore decrease blood pressure. Beta-blockers can also be used
to decrease cardiac output to decrease blood pressure.
Orthostatic Intolerance
We know that 70% of blood volume is below the heart due to the hydrostatic column effect.
KNOW THE NORMAL VALUES. Pulse pressure narrows considerably after you have the subject
stand up from a supine position. However, the mean pressure stays the same because of the
baroreceptor reflex, which cause vasoconstriction and thus increasing the total peripheral
resistae. The aroreeptor reflex seses the ea pressure, ut that has’t haged;
HOWEVER, the baroreceptor reflex also sensing the pulse pressure, this has decreased. When
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Document Summary

The mechanisms mediating long term control of blood pressure remain unclear. One hypothesis is that long term regulation of blood pressure occurs via changes in blood volume (via changes in the rate of urine formation) induced by changes in blood pressure. Figure 32 gives an example of the interaction between short term and long term factors. With an increase in arterial pressure, baroreflex reductions in total peripheral resistance (tpr) and cardiac output (co) occur (short term responses). Over time, the increase in arterial pressure increases glomerular filtration rate and thus urine formation (pressure diuresis). The increased urine flow decreases blood volume which helps restore blood pressure back to normal levels. Long term control of blood pressure is really long term control of renal function. Hypertension that occurs, progressive decrease, is lot of people that is due to deficit is renal function.

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