AP2 - respiratory formulas/calculations

21 terms by jennifer5974 

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vital capacity (VC)

maximal amount of air that can be exhaled after a maximal inspiration

vital capacity (VC)

VC = TV + IRV + ERV

inspiratory capacity (IC)

maximum amount of air that can be inhaled after a normal expiration

inspiratory capacity (IC)

IC = TV + IRV

functional residual capacity (FRC)

amount of air remaining in lungs after a normal expiration

functional residual capacity (FRC)

FRC = ERV + RV

total lung capacity (TLC)

maximum amount of air the lungs can hold

total lung capacity (TLC)

TLC = TV + IRV + ERV + RV
or
TLC = VC + RV

tidal volume (TV)

amount of air inhaled and exhaled in one respiratory cycle under normal resting conditions

inspiratory reserve volume (IRV)

amount of air that can be forcefully inhaled after a normal TV inhalation

expiratory reserve volume (ERV)

amount of air that can be forcefully exhaled after a normal TV exhalation

residual volume (RV)

amount of air left in lungs after maximal exhalation

respiratory rate (RR)

amount of normal respiratory cycles (inhalation and exhalation) that occur in one minute (60 seconds), typically 12-20 reps/min

minute respiratory volume (MRV)

amount of air inhaled in one minute under normal resting comnditions, typically 6000-10000 ml/min

minute respiratory volume (MRV)

MRV = TV x RR

maximum voluntary ventilation (MVV)
or
maximum breathing capacity (MBC)

the amximum amount of air inhaled in one minute during physical activity, as high as 125000-170000 ml/min

forced vital capacity (FVC)

amount of air exhaled when a deep breath is taken then forcefully exhaled as much as possible (usually released in a period of 6-7 seconds)

forced expiratory volume (FEV)

amount of air expelled during specific tiem intervals of the FVC

alveolar ventilation rate (AVR)

amount of air exchanged in one minute under resting conditions

alveolar ventilation rate (AVR)

AVR = BR x (TV-DAV)

dead air volume (DAV)

amount of inhaled air that doesn't reach the alveoli because it gets caught in the mouth, mose, and bronchial tree; change lbs to ml

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