Lect22 - Feb4 - Cardio V

Lect22 - Feb4 - Cardio V - There will be 1-2 questions on...

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January 20, 2011 20 CV 20 ANS Affects on Conduction through the AV Node sympath control R P P R P P Changes in the ECG Observed with Sympathetic Activity to both SA and AV Nodes Question : What would you observe in the ECG in response to increases in parasymapthetic activity to SA Node, or AV Node, or both? Sympathetic Stimulation ! enhanced conduction through the AV Node ! Shortening of AV Conduction time & Shortening of the P-R interval in ECG. Parasympathetic ( Vagal ) Stimulation ! Delayed or cessation of conduction through the AV Node ! Prolongation in AV Conduction time & Lengthening of the P-R interval in ECG (No QRS if there is conduction block). There will be 1-2 questions on ECG on the midterm SNS stimulation - increases the slope of the pacemaker potential --> increased HR. Does not e f ect the level of repolarization. Increases opening of Ca2+ channels. Decreases HR even to the point of cardiac arrest. Increases the MDP di f erence, decreases the slope of the pacemaker potential by opening an additional K channel. Decreases the INaf. On ECG, SNS stimulation results in a decreases p-p interval or R-R interval
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January 20, 2011 21 Topic 3 - Hemodynamics CV 21 Chapter 10 1. What determines Systolic Blood Pressure? 2. What determines Diastolic Blood Pressure? 3. Why is Systolic Blood Pressure higher than Diastolic Blood Pressure? 4. If there is less volume of blood on the arterial side than on the venous side of the circulatory system, why is arterial pressure higher than venous pressure? 5. Why are the arterioles considered the resistance elements within the circulatory system and not the capacitance elements? 6. Why are the venules and small veins considered the capacitance elements within the circulatory system and not the resistance elements? 7. If the capillaries are the smallest diameter blood vessels, why are they not the principle site of resistance to flow through the circulatory system?
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This note was uploaded on 08/21/2011 for the course NPB 101 taught by Professor Fuller,charles/goldberg,jack during the Winter '08 term at UC Davis.

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Lect22 - Feb4 - Cardio V - There will be 1-2 questions on...

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