Table 3.

Changes in ventilatory parameters

	Spontaneous breathing	20 L/min	30 L/min	40 L/min	50 L/min	nCPAP (6 mbar)	nCPAP (10 mbar)	nBiPAP (14/6 mbar)
VT
Mean (mL) ± SD;	441.2±146.2	534.2±215.2;	523.7±228.5;	561.7±248.8;	558.8±260.0;	562.6±215.7;	579.3±262.6;	606.9±249.5;
mean (%) ± SD		104.9±21.4	113.3±27.6	123.2±27.7	123.8±27.2	125.3±29.4	126.8±28.8	133.6±30.1
P-value from mean (%)		<0.01	<0.05	<0.01	<0.01	<0.01	<0.01	<0.01
BR
Mean (bpm) ± SD;	15.7±4.1	11.6±3.6;	11.1±3.6;	10.3±3.3;	9.9±2.7;	14.3±3.8;	14.3±4.3;	15.4±4.3;
mean (%) ± SD		76.6±17.0	73.8±18.1	71.0±19.1	67.9±14.8	94.6±14.0	94.2±16.3	101.6±18.4
P-value from mean (%)		<0.01	<0.01	<0.01	<0.01	>0.05	>0.05	>0.05
MV
Mean L/min ± SD;	7.1±2.9	6.0±2.8;	5.6±2.6;	5.5±2.5;	5.4±2.5;	7.8±3.2;	8.2±3.8;	8.9±3.5;
mean (%) ± SD		86.6±14.2	83.3±21.1	85.3±24.0	83.7±24.7	117.7±32.2	119.9±28.6	133.7±36.2
P-value from mean (%)		<0.01	<0.01	<0.01	<0.01	0.01	<0.01	<0.01

Note: P-values in comparison to spontaneous breathing.

Abbreviations: BR, breathing rate; MV, minute volume–medium prong size; nCPAP, (nasal) continuous positive airway pressure; nBiPAP, (nasal) bilevel positive airway pressure; VT, tidal volume; SD, standard deviation.