Calculating Heart Rate, Stroke Volume and Cardiac Output Flashcards

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What is heart rate and what unit is it measured in?

The number of heart beats each minute, measured in beats per minute (bpm).

The volume of blood pumped by one ventricle in one beat, measured in millilitres (mL) per beat.

The volume of blood pumped by the heart each minute, measured in mL per minute (mL/min) or litres per minute (L/min).

Cardiac output (mL per minute) = stroke volume (mL per beat) x heart rate (beats per minute).

Heart rate (bpm) = number of beats / time in minutes. If counted in seconds, use (beats / seconds) x 60.

(20 / 15) x 60 = 80 bpm.

70 x 72 = 5040 mL/min, which is 5.04 L/min.

Stroke volume (mL per beat) = cardiac output (mL per minute) / heart rate (beats per minute).

4.8 L/min = 4800 mL/min; 4800 / 80 = 60 mL per beat.

Heart rate (bpm) = cardiac output (mL per minute) / stroke volume (mL per beat).

5.6 L/min = 5600 mL/min; 5600 / 70 = 80 bpm.

1 mL = 1 cm^3 (they are the same volume).