Table 1.

Differences in tidal volumes (V_T) measured by turbine driven ventilator and lung simulator at different levels of PEEP in the bench study.

Simulated Condition	(TDV-LS) PEEP 5 cmH2O	(TDV-LS) PEEP 8 cmH2O	(TDV-LS) PEEP 10 cmH2O	(TDV-LS) PEEP 12 cmH2O	P value
Normal	51 (3)°+	31.1(3.5)*+	21.8 (2)*°		<0.001
Restrictive	61 (3)°+§	10,4 (1.3)*+§	1,1 (1.6)*°§	−11,9 (1.9)*°+	<0.001
Obstructive	164 (2)°+	132,5 (1.6)*+	127,3(3.1)*°		<0.001

Data are expressed in ml and reported as mean (±SD).

PEEP: positive end expiratory pressure; TDV: turbine driven ventilator; LS: lung simulator; (TDV-LS): difference between V_T measurements by turbine driven ventilator and lung simulator.

*Different from 5; °different from 8, ⁺different from 10, ^§different from 12.