Coordinated Vascular Response Flashcards
Is the right side of the heart more of a volume pump or more of a pressure pump?
volume pump
Is the left side of the heart more of a volume pump or more of a pressure pump?
more of a pressure pump.
Are the vascular beds arranged in both series and parallel circuits?
YES. series within each organ and in parallel collectively to each system.
Where can we feel for pulses?
radial, brachial, carotid, femora, or dorsalis pedis
Can vascular beds regulate flow through them?
YES. This is why a patient can have a BP of 80/40 and still be adequately perfused.
What bridges the arterial and venous systems?
the capillary beds
What is the equation for MABP again?
MABP= CO * TPR
What happens to CO initially with increases in HR?
It goes up
What happens to CO with excessive increases in HR over time?
it will begin to decrease because we are decreasing cardiac filling time (diastole)
Does TPR vary throughout the body at different segments?
YES, to help direct blood flow where it needs to go
What would an alpha blocking drug do to TPR?
block vascular smooth muscle restriction and lower the BP
What would a beta blocking drug do to the heart?
decrease heart rate to decrease CO, thus lowering BP
What is MABP really reflecting?
Ohm’s Law (V=I*R)
What happens to TPR when you are relaxed?
it decreases.
What happens to TPR when you smoke a cigarette?
nicotine stimulates the autonomic nervous system (nicotinic receptors) causing TPR to increase!
What does cocaine do to MABP?
stimulates sympathetics, increasing TPR and thus also MABP!
How can we treat hypertension?
decrease CO by decreasing SV, decrease HR (via beta blockers), give vasodilators to decrease TPR, or diuretics to make the patient pee more.