DISPLAY F EATURES
VF8 DELTA/DELTA XL/KAPPA 21-17
PEF Peak Expiratory Flow Highest airway flow measured during expiration L/min
PIF Peak Inspiratory Flow Highest airway flow during inspiration L/min
PIP Peak Inspiratory
Pressure
Highest airway pressure during inspiration cmH
2
O
Raw e Expired Dynamic
Airway Resistance
(mechanical)
Amount of pressure required to move gas at a flow
of one liter per second, derived from expiration
(P[end exp] - Pause) /Flow [end exp]
cmH
2
O
/ L / s
Raw i Inspired Dynamic
Airway Resistance
(mechanical)
Represents the dynamic resistance to inspiratory
airflow created by the breathing circuit, ET tube,
and major airways of the lung
(P[end insp] - Pause)/Flow [end insp]
cmH
2
O
/ L / s
RRv Respiratory Rate Average frequency of last 8 breaths 1/min
RSBI Rapid Shallow
Breathing Index
Respiratory rate divided by tidal volume for
spontaneous breaths, (RRs/TVs), for RRs
< 57 bpm
bpm/L
T i Inspiratory time Duration of inspiration sec
T e Expiratory time Duration of expiration sec
TV lk ET tube leakage
(mechanical)
Difference between expired and inspired tidal
volume expressed as a percent in mechanical
breaths (100 x [TVi m - TV e m] )/ TV i
%
TValv Alveolar Tidal Volume Average volume calculated from difference of
expired volume and airway deadspace
TVe - TVd aw
mL
TVCO2 CO2 Tidal Volume Volume of CO
2
expired per breath, calculated from
concentration of expired CO
2
less concentration of
inspired CO2 and multiplied by total expired
breath, compensated to STPD (Standard
Temperature and Pressure Dry)
TV alv X PeCO
2
mL
TVd
aw
Airway (anatomic)
Deadspace
Volume of breath not participating in gas exchange
measured during expiration
(ineffective tidal volume)
mL
TVd/
TV aw
Airway Dilution Ratio
(Ratio of Tidal Volume
to Airway Deadspace)
Tidal volume lost to airway deadspace divided by
Expired Tidal Volume during a spontaneous or
mechanical breath
TVe Expired Tidal Volume Average expired volume of current breath mL
TVi Inspired Tidal Volume Average inspired volume of current breath
mL
VCO2 CO2 Minute Elimination Volume of CO
2
expired per minute, compensated
to STPD (Standard Temperature and Pressure
Dry) TVCO
2
x RRv
mL/min
Label Description Derivation Units
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