Ventricular Function 1

Question 1

stroke volume

Answer 1

vol of blood released from ventricle during one contraction (difference btwn ESV and EDV)

Question 2

relationship btwn LV vol and InV pressure

Answer 2

directly proportional, max at 150*

Question 3

preload

Answer 3

filling of ventricles, venous return

the magnitude of the maximal (end-diastolic) ventricular volume or the end-diastolic pressure stretching the ventricles.

Question 4

what causes atrial systole

Answer 4

SA node

p wave

Question 5

afterload

Answer 5

resistance of ventricle has to overcome in order to eject blood into vasculature

*indicated by pressure in artery

Question 6

contractility (inotropy)

Answer 6

intrinsic property of myocardium that accounts for changes in strength of contraction when pre-&after-load static

Question 7

end diastolic volume

Answer 7

vol of blood in ventricle at end of ventricular filling

Question 8

end systolic volume

Answer 8

vol of blood in ventricle at end of ejection

Question 9

ejection fraction

Answer 9

fraction of end-diastolic volume that is ejected during systole

normal= >55%

Question 10

cardiac output

Answer 10

volume of blood ejected by ventricle per minute

Question 11

ventricular compliance (C)

Answer 11

change in pressure/change in volume

describes ability of ventricle to accommodate volume

Question 12

vessel compliance

Answer 12

change in volume/change in pressure

Question 13

ESVPR

Answer 13

max pressure that the ventricle can develop for any given ventricular vol. at a given ionotropic state

Question 14

EDVPR

Answer 14

the passive filling curve for the ventricle

Question 15

chronotropy

Answer 15

cardiac rate

Question 16

lusitropy

Answer 16

relaxation of myocardium

Question 17

V0

Answer 17

pt at which an increase in vol causes detectable increase in intraventricular pressure

Question 18

Frank-Starling Law (length-tension)

Answer 18

vol. of blood ejected during systole is determined by vol of blood in ventricle @ end of diastole

Question 19

actively developed pressure

Answer 19

the difference between S & D at any point on the PV graph

Question 20

reciprocal of compliance

Answer 20

tangent slope of compliance curve