VD/VT

In medicine, the ratio of physiologic dead space over tidal volume (V_D/V_T) is a routine measurement, expressing the ratio of dead-space ventilation (V_D) to tidal ventilation (V_T), as in physiologic research or the care of patients with respiratory disease.^[1]

Equation

\frac{V_D}{V_T} = \frac{P_a CO_2 - P_E CO_2}{P_a CO_2}

References

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[1]

v t e Mechanical ventilation
Fundamentals	Modes of mechanical ventilation Mechanical ventilation in emergencies Mechanical ventilation in neonates Nomenclature of mechanical ventilation
Modes	IMV/SIMV CMV ACV CSV PAP BPAP CPAP APRV MMV PAV ASV HFV
Related illness	ARDS Pulmonary barotrauma Pulmonary volutrauma Ventilator-associated pneumonia Oxygen toxicity Ventilator-associated lung injury
Pressure	P_EEP FiO₂ Δ_P P_IP P_S P_AW P_plat
Volumes	V_T V_E V_f
Other	C_dyn C_static P_AO₂ V_D/V_T OI A-a gradient

VD/VT

Equation

References

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