Flashcards in Lecture 18: Arterial System and Pulse Pressure (Hayward) Deck (28):
BP usually measures:
arterial or venous side has more resistance?
Pressure in arterial system is a fx of:
volume in minus volume out
assoc. with sudden release of push from heart; there is initial fast recoil that is very fast, which means there will be a squeeze of blood on arterial system that is greater than what's leaving at that time
What physiological factors determine arterial pressure?
cardiac output, vascular resistance
What physical factors determine arterial pressure?
blood volume, vessel compliance. We have less control over these
increased vessel compliance --> change in pressure for same volume in?
increased cardiac output --> MAP at constant TPR?
Increased TPR with constant cardiac output --> MAP?
Total energy =
= KE + PE = systolic energy
What type of energy is used to move blood forward during diastole?
outflow >>>inflow in ________
inflow > outflow in _______
changes in CO force changes in _____ if TPR remains the same
pulse pressure =
systolic pressure - diastolic pressure
MAP = CO * TPR = (HR*SV) * TPR = Pdia + [(Psys - Pdia)/3]
peak pressure generated when heart pumps blood out to arterial system
Main factors contributing to systolic pressure (3)
1) ventricular stroke volume
2) rate of ejection
3) compliance of aorta
increased SV with all else same--> systolic pressure?
increases (i.e. athlete)
decreased compliance with all else same --> systolic pressure
increased stroke volume --> diastolic pressure
importance of pulse pressure
tells you how volume is moving through the CV system. Pressure felt when feeling a pulse
high resistance in system
aortic insufficiency during diastole --> arterial pressure, pulse pressure?
arterial pressure drops, pulse pressure rises
2 Possible causes of low pulse pressure
2) congestive heart failure (damage to heart tissue)
3 possible causes of high pulse pressure
1) bradycardia (results in slow filling)
3) decreased aortic compliance
measuring diastolic pressure
point when flow changes from turbulent to laminar flow when pressure cuff released