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Old 03-12-2012
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Sphygmomanometer Increased Pulse Pressure & AV block!

Can someone explain how pulse pressure is increased in AV block. According to Kaplan, ventricular rate is 30-45 bpm in complete AV block. And because CO is normal, SV is increased and hence in each heartbeat, greater amount of blood is accommodated in arterial tree, which causes greater rise and fall in pressure during systole and diastole.

What I know is:
SBP affected by SV and compliance changes (stiffness).
DBP affected by TPR and HR.
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Because according to the frank-starling mechanism by having an slow heart rate you allow for more blood to be accomodated in the ventricles and thats why your SV rises, remember that Pulse pressure is directly related to SV, an increase in SV automatically will increase pulse pressure.

In aortic insufficiency there is a similar mechanism (back flow of blood increases SV in the next hear beat and so on)
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Old 03-12-2012
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Quote:
Originally Posted by Daniel Wai View Post
SBP affected by SV and compliance changes(stiffness).
DBP affected by TPR and HR.
isn't SBP affected by TPR?
and DBP by preload?
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Old 03-12-2012
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The concept of wide versus narrow Pulse Pressure

DBP determined by TPR, because during diastole when ventricle is relaxed, the thing giving pressure to blood is now the arterial system, by virtue of smooth muscle.
pls see this post. what i said is from KLN.
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