FA Cardiovascular Physiology pp218
Terms
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- CO = (2 things)
-
CO = SV*HR;
Fick principle: CO = rate of O2 consumption / (aO2 - vO2) - MAP = (2 things)
-
MAP = CO * TPR
MAP = (1/3) systolic + (2/3) diastolic - Pulse pressure = (2 things)
-
Pulse pressure = systolic - diastolic
Pulse pressure ~= stroke volume - Sv = (2 things)
-
SV = CO/HR
SV = EDV - ESV - initial exercise, prolonged exercise
-
initial: inc SV
prolonged: inc HR - If HR is too high, then:
- diastolic filling is incomplete, get dec CO (eg. ventricular tachycardia)
- SV affected by
-
SV CAP
inc SV: inc contractility, dec afterload, inc -0preload - contractility inc by:
-
catecholamines
inc intra ca2+
dec intra Na+
digitalis - contractiliy dec by:
-
beta 1 blockers
heart failure
CCB
acidosis
hypoxia/hypercapnea - myocardial O2 demand is inc by:
- inc: afterload, contractility, heart rate, heart size (wall tension)
- preload =
- ventricular EDV
- afterload =
- systolic arterial pressure