Ventricular Function 1 Flashcards
stroke volume
vol of blood released from ventricle during one contraction (difference btwn ESV and EDV)
relationship btwn LV vol and InV pressure
directly proportional, max at 150*
preload
filling of ventricles, venous return
the magnitude of the maximal (end-diastolic) ventricular volume or the end-diastolic pressure stretching the ventricles.
what causes atrial systole
SA node
p wave
afterload
resistance of ventricle has to overcome in order to eject blood into vasculature
*indicated by pressure in artery
contractility (inotropy)
intrinsic property of myocardium that accounts for changes in strength of contraction when pre-&after-load static
end diastolic volume
vol of blood in ventricle at end of ventricular filling
end systolic volume
vol of blood in ventricle at end of ejection
ejection fraction
fraction of end-diastolic volume that is ejected during systole
normal= >55%
cardiac output
volume of blood ejected by ventricle per minute
ventricular compliance (C)
change in pressure/change in volume
describes ability of ventricle to accommodate volume
vessel compliance
change in volume/change in pressure
ESVPR
max pressure that the ventricle can develop for any given ventricular vol. at a given ionotropic state
EDVPR
the passive filling curve for the ventricle
chronotropy
cardiac rate
lusitropy
relaxation of myocardium
V0
pt at which an increase in vol causes detectable increase in intraventricular pressure
Frank-Starling Law (length-tension)
vol. of blood ejected during systole is determined by vol of blood in ventricle @ end of diastole
actively developed pressure
the difference between S & D at any point on the PV graph
reciprocal of compliance
tangent slope of compliance curve
