mark wrote:
Quote:
4. The maximum rate of rise of intraventricular pressure (dP/dt max) is:
a. increased by phenylephrine
b. decreased by sympathetic activity
c. independent of end diastolic pressure
d. decreased by a high aortic pressure
e. independent of heart rate
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a F b F c F d e F
Maximum rate of rise of intraventricular pressure is influenced by
preload - increased resting fibre length increase force of contraction (starlings law)
afterload - increased afterload initially leads to reduced SV, hence increased EDV, and resulting increased force of contraction (Anrep effect)
Heart rate - increased HR, increased force of contraction (Bowditch effect)
Sympathetic stimulation - increased contractility
Linear Mode
