Tidal Volume (Vt): amount of air you move into or out of lungs during a single respiratory cycle
Functional Residual Capacity (FRC): amount of air remaining in our lungs after you have completed a quiet respiratory cycle. It is the sum of ERV and residual volume
Expiratory Reserve Volume (ERV): amount of air that you can voluntarily expel after you have completed a normal quiet respiratory cycle
Inspiratory Reserve Volume (IRV): amount of air that you can breathe in over and above the tidal volume
Residual Volume: amount of air that remains in your lungs even after a maximal exhalation
Vital Capacity: max amount of air that you can move into or out of lungs in a single respiratory cycle. Sum of ERV, Vt, and Inspiratory Reserve Volume.
Total Lung Capacity: total volume of your lungs, calculated by adding vital capacity and residual volume.
The volume of air inhaled that does not take part in gas exchange.
The amount of air that is moved into or out of the lungs per minute.
Calculated by multiplying tidal volume (mL) by breathing rate (bpm)
Normal minute ventilation is 500-600mL, rate 10-14 breaths/min. Low ventilation consists of 500mL, rate 6 breaths/min. This can lead to COPD and asthma, as well as risk of auto-PEEP (incomplete expiration prior to the inhalation of the next breath, causes hyperinflation) and barotrauma (injuries caused by increased air or water pressure). This requires closely monitoring blood pressure
High minute ventilation can lead to acidosis and respiratory alkalosis, and risk of inadequate compensation