Monitoring of noninvasive ventilation: comparative analysis of different strategies

Respiratory Research

Table 4 Results of receiver operating characteristic curve analyses for mean nocturnal SpO₂, time spent with SpO₂ < 90% and morning PaCO₂ for the detection of inappropriate NIV (according to strategy D)

	Threshold	Sensitivity (%)	Specificity (%)	Positive likelihood ratio	Negative likelihood ratio
Mean nocturnal SpO₂ (%)	88	7.1	100	1.08	1
	90	32.4	100	4.38	0.69
	92	45.9	91.7	5.51	0.59
	94	71.6	70.8	2.46	0.40
	96	90.5	29.2	1.28	0.32
Time spent with SpO₂ < 90% (% of total recording time)	5	63.5	95.8	15.24	0.38
	20	43.2	95.8	10.38	0.59
	30	43.2	100		0.57
Morning PaCO₂ (mmHg)	42	69.9	90.9	7.68	0.33
	45	50.7	95.4	14.16	0.37
	48	36.2	100		0.64

PaCO₂ arterial carbon dioxide partial pressure, SpO₂ transcutaneous pulsed oxygen saturation

ISSN: 1465-993X