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A/C Assist/control
AG Anion gap
APRV Airway pressure release ventilation
ARDS Acute respiratory distress syndrome
ARDSnet ARDS network
AVAPS Average volume assured pressure support
BAL Bronchoalveolar lavage
BE Base excess
BEE Basal energy expenditure
BSA Body surface area
CCI Chronic critical illness
Cao2 Oxygen content of arterial blood
Cc′o2 Pulmonary capillary oxygen content
CDC Centers for Disease Control and Prevention
CI Cardiac index
Cl Lung compliance
Cl Chloride ion
CMV Continuous mandatory ventilation
CO Carbon monoxide
Co2 Oxygen content of the blood
COPD Chronic obstructive pulmonary disease
CPAP Continuous positive airway pressure
CPP Cerebral perfusion pressure
CPR Cardiopulmonary resuscitation
CSV Continuous spontaneous ventilation
CT Computed tomography
Cv̄o2 Mixed venous oxygen content
CVP Central venous pressure
CW Chest wall compliance
Do2 Oxygen delivery
EAdi Electrical activity of the diaphragm
ECLS Extracorporeal life support
ECMO Extracorporeal membrane oxygenation
EELV End-expiratory lung volume
EPAP Expiratory positive airway pressure
fb Frequency of breathing; respiratory rate
fc Heart rate
Fio2 Fraction of inspired oxygen
FRC Functional residual capacity
Hb Hemoglobin
HbCO Carboxyhemoglobin
HCO3 Bicarbonate concentration
HFJV High frequency jet ventilation
HFOV High frequency oscillatory ventilation
HFPPV High frequency positive pressure ventilation
HFV High frequency ventilation
HME Heat and moisture exchanger
Hz Hertz
I:E Inspiratory time to expiratory time ratio
IBW Ideal body weight (sometimes called predicted body weight)
ICP Intracranial pressure
ICU Intensive care unit
IMV Intermittent mandatory ventilation
iNO Inhaled nitric oxide
IPAP Inspiratory positive airway pressure
ISB Isothermal saturation boundary
IVAC Infection related ventilator associated condition
j Joules
LV Left ventricle
LVSWI Left ventricular stroke work index
MAP Mean arterial pressure
MDI Metered-dose inhaler
MIC Maximum insufflation capacity
MIE Mechanical insufflation–exsufflator
MMV Mandatory minute ventilation
MODS Multiple organ dysfunction syndrome
MPAP Mean pulmonary artery pressure
NO Nitric oxide
Na+ Sodium
NAVA Neurally adjusted ventilatory assist
NIV Noninvasive ventilation
NPE Neurogenic pulmonary edema
OI Oxygenation index
ΔPaw Change in airway pressure
ΔPL Transpulmonary pressure
ΔPOP Plethysmographic waveform amplitude
ΔPpl Change in pleural pressure
P(a-et)CO2 Difference between arterial and end-tidal Pco2
Pao2/Pao2 Ratio of arterial PO2 to alveolar Po2
Pao2/Fio2 Ratio of arterial Po2 to Fio2
P(a-a)o2 Difference between alveolar Po2 and arterial Po2
Paco2 Partial pressure of carbon dioxide in arterial blood
P̄alv Mean alveolar pressure
Palv Alveolar pressure
Pao2 Partial pressure of oxygen in arterial blood
Pao2 Alveolar Po2
PAP Pulmonary artery pressure
PAV Proportional-assist ventilation
P̄aw Mean airway pressure
Pb Barometric pressure
Pbo2 Brain Po2
PC-CMV Continuous mandatory ventilation with pressure control
PC-IMV Pressure-controlled intermittent mandatory ventilation
PCIRV Pressure-controlled inverse ration ventilation
Pco2 Partial pressure of carbon dioxide
PCV Pressure-controlled ventilation
PCWP Pulmonary capillary wedge pressure
Pdi Transdiaphragmatic pressure
Pēco2 Mixed exhaled Pco2
Ph2o Water vapor pressure
PEEP Positive end-expiratory pressure
PEG Percutaneous endoscopic gastrostomy
Peso Esophageal pressure
Petco2 End-tidal Pco2
Pexhco2 Measured mixed exhaled Pco2 including gas compressed in the ventilator circuit
pH Negative log of the hydrogen ion concentration
PI Plethysmographic perfusion index
Pimax Maximum inspiratory pressure
PImin Minimal value of the plethysmographic perfusion index
PIP Peak inspiratory pressure
Pmus Pressure generated by the respiratory muscles
PMV Prolonged mechanical ventilation
Po2 Partial pressure of oxygen
Pplat Plateau pressure
PPV Arterial pulse pressure variation
PRVC Pressure-regulated volume control
PSV Pressure support ventilation
Ptcco2 Transcutaneous Pco2
Ptco2 Transcutaneous Po2
Pv̄co2 Mixed venous Pco2
Pvent Pressure-generated by the ventilator
PVI Plethysmographic variability index
Pv̄o2 Mixed venous Po2
PVR Pulmonary vascular resistance
Q̇c Cardiac output
s/Q̇t Pulmonary shunt
R Respiratory quotient
RE Expiratory resistance
REE Resting energy expenditure
REM Rapid eye movement
Ri Inspiratory resistance
RSBI Rapid shallow breathing index
RVSWI Right ventricular stroke work index
Sao2 Hemoglobin oxygen saturation of arterial blood
SBT Spontaneous breathing trial
Scvo2 Central venous oxygen saturation
SID Strong ion difference
SIMV Synchronized intermittent mandatory ventilation
Sjvo2 Jugular venous oxygen saturation
Spco Carbon monoxide measured by pulse oximetry
SpHb Hemoglobin measured by pulse oximetry
SpMet Methemoglobin measured by pulse oximetry
Spo2 Hemoglobin oxygen saturation measured by pulse oximetry
SVI Stroke volume index
Sv̄o2 Mixed venous oxygen saturation
SVR Systemic vascular resistance
SVRI Systemic vascular resistance index
TE Expiratory time
TI Inspiratory time
TT Total cycle time
UUN Urine urea nitrogen
a Alveolar ventilation
V̇/Q̇ Ratio of ventilation to blood flow
VAC Ventilator-associated condition
VAE Ventilator-associated event
VAP Ventilator-associated pneumonia
VC Vital capacity
co2 Carbon dioxide production
d Dead space ventilation
e Minute ventilation
i Inspiratory flow
VCV Volume-controlled ventilation
VC-CMV Continuous mandatory ventilation with volume control
VC-IMV volume-controlled intermittent mandatory ventilation
VD/VT Dead space to tidal volume ratio
VILI Ventilator-induced lung injury
V̇o2 Oxygen consumption
VS Volume support
VT Tidal volume
W Work
τ Time constant

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