ECG, Metabolism and Cardiodynamics Flashcards
What is cardiac output?
Its the volume of blood pumped out of the heart every minute
Give a normal reading for cardiac output.
Approximately 5 L per minute for a 70 kg male
What determines cardiac output?
Heart rate and stroke volume
Define heart rate.
The number of contractions (beats) the ventricles perform in one minute
Give a normal reading for heart rate.
74 bpm at rest
Define stroke volume.
The volume of blood pumped out of the ventricle during systole
Give a normal reading for stroke volume.
70 ml for a 70kg male
Define minute ventilation.
The volume of air brought into the lungs each minute
Give a normal reading for minute ventilation.
Approximately 6 L per minute for a 70 kg male
What is the equation for calculating minute ventilation?
V = Tidal volume x respiration rate
Define tidal volume.
The volume of air brought into the lungs with each breath
Give a normal reading for tidal volume.
Approximately 500-750ml at rest
Dependent on height
Define respiration rate.
The number of breaths per minute
Give a normal reading for respiration rate.
approximately 16 breaths per minute at rest
What are the three different ways of measuring cardiac output?
Stress test
VO2 max
Metabolic rate
