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Heart Definitions

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Submitted By jsefton730
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Peripheral resistance is the resistance of the arteries to blood flow. As the arteries constrict, the resistance increases and as they dilate, resistance decreases.

Blood viscosity: increased viscosity increases resistance.

Heart rate, or heart pulse, is the speed of theheartbeat measured by the number of poundings of the heart per unit of time

Venous return is the rate of blood flow back to the heart. It normally limits cardiac output. Superposition of the cardiac function curve andvenous return curve is used in one hemodynamic model.

Stroke volume is the amount of blood ejected by the left ventricle in one contraction. Although stroke volume can refer to either left or right side of the heart, it is most associated with the left side. It is measured in ml/beat and generally has a normal value of about 1 cc/kg.

Cardiac output is the volume of blood pumped by the heart per minute (mL blood/min). Cardiac output is a function of heart rate and stroke volume. The heart rate is simply the number of heart beats per minute. The stroke volume is the volume of blood, in milliliters (mL), pumped out of the heart with each beat.

Heart failure (HF), often referred to as chronic heart failure (CHF), occurs when the heartis unable to pump sufficiently to maintain blood flow to meet the body's needs.

systolic pressure is the pressure caused by the contraction of the left ventricle pumping oxygenated blood into the aorta. diastolic pressure is the pressure in the circuit after contraction while the ventricle is relaxed and

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