Class notes
Cardiac output control
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Lecture notes of 4 pages for the course Medicine at QUB (CV physiology)
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CARDIAC OUTPUTCardiac output is the volume of blood pumped by the left
ventricle in one minute
In health Left ventricular output Right ventricular
output
CO HR x SV
Stroke Vor The amount of blood pumped by the left
ventricle in one contraction
Ejection fraction The fraction of C DV that is ejected
with each beat calculated via SV EDU
End diastolic volume Amount of blood within the
ventricles C
usually L before contraction
Example Olympic athlete ejection fraction 83
1 So I 180 vs Heart failure 25 t 50 200 due to
the heart becoming dilated with an A venous return T
End diastolic volume but to stroke volume Blood
escaping to venous return oedema
Sympathetic Fight or flight effects on HR Speeds
up the heart via a t chronotropic effect THR
B 1 receptor opens CaZt L channels
Increases slope of pre potential making it reach firing
level quicker more rapid SA firing
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