MEAN ARTERIAL PRESSURE
CO X SVR
CO = Cadiac output
SVR = Systemic vascular resistance
CO
SV X HR
SV = Stroke volume
HR = Heart rate
SVR
Volume of blood pumped per minute
Influenced by
Vasoconstriction/vasodilation
Blood vessel compliance/elasticity
Blood viscosity
Blood volume
SV
Afterload
Contractility
Preload
End diastolic volume that stretches the right or left ventricle of the heart to its greatest dimensions under variable physiologic demand.
The pressure against which the heart must work to eject blood during systole.
Inotropy
The force or energy of muscular contractions
Chronotropy
Rate of contractions
Resistance to blood flow offered by all of the systemic vasculature, excluding the pulmonary vasculature.
HR
PNS activity
Intrinsic rate
Vagal tone decreases HR
Natural rate of discharge of cardiac tissues in absence of other factors
SNS activity
Increases firing of SA node
Pharmacologic
Positive chronotropes increase HR