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Old 11-08-2011
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Default Dumb question on Diastolic blood pressure

So I was doing a Kaplan question on cardio phys and was wondering when does one measure diastolic blood pressure in the cardiac cycle? I know I know it is a dumb question, but I ask this since I was doing this question:

Patient comes with CHF and history shows that he has a right subclavian arteriovenous fistula for past 10years. Which of the following sets of changes is present in this man during rest, compared to normal conditions? The answer came to this:

Cardiac Output: Increased
Systemic Vascular Resistance: Decreased
Mixed Venous O2 content: Increased
Diastolic Blood Pressure: Decreased


I can see why first 3 are correct, but diastolic blood pressure been decreased is confusing me. I always thought that diastolic pressure was measured during filling (just before the vents had enough pressure to open the aortic valve), so I thought it should be increased since you have more blood due to fistula. The kaplan explanation says that since the blood rapidly exists the arterial system through the fistula you see a decreases . Correct me if I am wrong but wouldn't systolic decrease?
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Old 11-09-2011
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okay let me try to help
i see that you talk about the diastolic pressure as it is measured inside the heart
but that is not true ,it is measured in the periphery ,right??
so in the diastole you are not adding more blood to the arteries ,and since there is a fistula that steal the blood from the arteries to the veins ==>the diastolic pressure will decrease
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Old 11-09-2011
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Quote:
Originally Posted by dr.muhamad View Post
okay let me try to help
i see that you talk about the diastolic pressure as it is measured inside the heart
but that is not true ,it is measured in the periphery ,right??
so in the diastole you are not adding more blood to the arteries ,and since there is a fistula that steal the blood from the arteries to the veins ==>the diastolic pressure will decrease

Thank you. That makes sense. So essentially, Diastolic pressure is the pressure create after the aortic valve closes, and systolic volume is when the blood is leaving the vent to create that pressure in the body.
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Old 11-09-2011
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Quote:
Originally Posted by PassIton View Post
Thank you. That makes sense. So essentially, Diastolic pressure is the pressure create after the aortic valve closes, and systolic volume is when the blood is leaving the vent to create that pressure in the body.
yes thats it
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