Hemodynamic Terminology

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Hemodynamic terminology

Contractility

Strength of contraction

⇧ when preload is un▲ yet ♡ contracts ⇧ forcefully

Vascular resistance

SVR & PVR reflect afterload

Afterload

CO can be restored & myocardial 02 needs ⇓ by ⇓ afterload

Vasodilators can ⇓ afterload

Forces opposing ventricular ejection

mass & density of blood moves

systemic arterial pressure

Preload

Frank-Starling's law: the ⇧ a myocardial fiber is stretched, the during filling, the ⇧ it shortens during systole & ⇧ the contraction force

PAWP-measurement of pulmonary capillary pressure, reflects left ventricular end-diastolic pressure

left-ventricular end-diastolic pressure:Left ventricular preload

Volume within the ventricle @ the end of diastole

Cardiac output & cardiac index

Preload, afterload, & contractility determine SV(& thus CO and BP)

Pulmonary vascular resistance (PVR): opposition encountered by the right ventricle

Systemic Vascular resistance: opposition encountered by the left ventricle

Stroke Volume index: measurement of SV adjusted for BSA

Stroke Volume: volume ejected w each beat

Cardiac index: measurement of CO adjusted for body surface area

Cardiac output: volume of blood in liters pumped by the heart in 1 minute