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Monitors and definitions (continued)
Mechanics (continued)
Cstat
Cstat/kg
PIFR
PEFR
Ccw
CLUNG
C
/ C
20
R
RS
R
PEAK
R
IMP
R
LUNG
dP
AW
dP
ES
AutoPEEP
dAutoPEEP
AutoPEEP
ES
P
Plat
tp
Respiratory system compliance (C
Cstat), absolute and normalized to patient weight.
Note: This requires an Inspiratory Hold maneuver.
Peak inspiratory flow rate.
Peak expiratory flow rate.
The ratio of the tidal volume (exhaled) to the delta esophageal
Pressure (dP
). Requires an esophageal balloon.
ES
The ratio of the tidal volume (exhaled) to the delta
transpulmonary pressure. The delta transpulmonary pressure
is the difference between the airway plateau pressure (during
an inspiratory pause) and esophageal pressure (at the time
the airway plateau pressure is measured) minus the difference
between the airway and esophageal baseline pressures. Requires
an inspiratory hold and esophageal balloon.
The ratio of the dynamic compliance during the last 20% of
inspiration (C
) to the total dynamic compliance (C).
20
The total resistance during the inspiratory phase of a breath.
Respiratory system resistance is the ratio of the airway pressure
differential (peak–plateau) to the inspiratory flow 12 ms prior to
the end of inspiration. Requires an inspiratory hold.
The peak expiratory resistance (R
at the time of the peak expiratory flow (PEFR).
The airway resistance between the wye of the patient circuit
and the tracheal sensor. Requires an inspiratory hold and
tracheal catheter.
The ratio of the tracheal pressure differential (peak–plateau) to
the inspiratory flow 12 ms prior to the end of inspiration. Requires
an inspiratory hold and tracheal catheter.
The difference between peak airway pressure (P
line airway pressure (PEEP
The difference between peak esophageal pressure (PPEAK
baseline esophageal pressure (PEEP
The airway pressure at the end of an expiratory hold maneuver.
Requires a passive patient.
The difference between airway pressure at the end of an
expiratory hold maneuver and the airway pressure at the start of
the next scheduled breath after the expiratory hold maneuver.
Requires a passive patient.
The difference between esophageal pressure measured at the end
of exhalation (PEEP
the start of a patient-initiated breath (P
the ventilator's demand system. The sensitivity of the ventilator's
demand system is the difference between the baseline airway
pressure (PEEP
) and the airway pressure when the patient
AW
initiates a breath (PAW start). Requires an esophageal balloon.
Transpulmonary pressure during an inspiratory hold, which is the
difference between the airway plateau pressure (P
corresponding esophageal pressure. Requires an inspiratory hold
and esophageal balloon.
), (a.k.a. static compliance
RS
) is defined as the resistance
PEAK
).
AW
).
ES
) minus the esophageal pressure measured at
ES
) and base-
PEAK AW
) and the sensitivity of
ES start
) and the
PLAT AW
) and
ES
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