# AP2 - respiratory formulas/calculations

### 21 terms by jennifer5974

#### Study  only

Flashcards Flashcards

Scatter Scatter

Scatter Scatter

## Create a new folder

### 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

IC = TV + IRV

### functional residual capacity (FRC)

amount of air remaining in lungs after a normal expiration

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

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)

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

Example: