End-tidal carbon dioxide monitoring using a naso-buccal sensor is not appropriate to monitor capnia during non-invasive ventilation

Annals of Intensive Care

Table 2 Respiratory rate, blood gas analysis at inclusion, and main initial ventilator settings

Patient number	RR [cycles/min]	SaO ₂ [%]	pH	PaCO ₂ [mmHg]	Bicarbonates [mmol/L]	PaO ₂ [mmHg]	FIO ₂	PaO ₂ /FIO ₂ ratio [mmHg]	Initial IPAP [cmH ₂ O]	Initial EPAP [cmH ₂ O]
1	12	93	7.41	45	27.7	62	0.28	159	15	10
2	17	92	7.38	52	29.6	64	0.35	148	12	7
3	16	88	7.46	45	31.1	53	0.5	89	14	6
4	41	91	7.41	55	34.7	58	0.35	158	12	7
5	21	94	7.32	80	39.8	67	0.4	200	20	8
6	30	99	7.41	55	34.0	112	0.4	138	12	7
7	27	92	7.42	61	38.8	62	0.5	123	8	5
8	29	91	7.40	50	30.7	61	0.5	101	11	6
9	25	90	7.33	58	29.4	58	0.4	145	15	6
10	28	95	7.37	58	32.5	75	0.35	165	12	6
11	20	92	7.47	51	36.7	59	0.3	171	15	6
Median	25	92.	7.41	55.3	32.5	62	0.4	148	12	6
Centile 25	19	91	7.37	51	30.2	58	0.35	131	12	6
Cetile 75	29	93	7.42	58	35.7	65	0.45	162	15	7

RR, respiratory rate; SaO₂, oxygen saturation in arterial blood; PaCO₂, carbon dioxide partial pressure in arterial blood; PaO2, oxygen partial pressure in arterial blood gas; PaO₂/FIO₂, oxygen partial pressure in arterial blood gas over inspired fraction of oxygen ratio; IPAP, set inspiratory pressure; EPAP, set expiratory pressure.