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21 terms

AP2 - respiratory formulas/calculations

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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