The effectiveness of high-flow nasal cannula during sedated digestive endoscopy: a systematic review and meta-analysis

Table 2 Patient characteristics of participants in studies included in the meta-analysis

Study, group, %*
	Kim [22]		Teng [26]		Mazzeffi [27]		Lin [21]		Nay [28]		Riccio [23]		Thiruvenkatarajan [24]
Characteristic	HFNC n = 36	SNC n = 36	HFNC n = 50	SNC n = 51	HFNC n = 132	SNC n = 130	HFNC n = 994	SNC n = 1000	HFNC n = 191	SNC n = 188	HFNC n = 28	SNC n = 31	HFNC n = 65	SNC n = 66
Age, mean yr	65.3	67.3	46.7	51.6	62	62	48	47	64$	64$	54	59	69.1	65.5
Male sex	61.1	69.4	38	43.1	87	71	41.5	41	57	51	14	13	43.1	40.9
Operation
ERCP	100	100			23.5	20.8							100	100
EGD			100	100	76.5	79.2
gastroscopy							100	100	18.3	20.2
colonoscopy									52.4	48.9	100	100
combined^#									29.3	30.9
BMI, mean	23.1	22.1	22.5	23.4	28.3	28.2	22.8	23	27^$	26.6^$	48	49	30	28.2
ASA grade
1 and 2	52.8	58.3	100	100			100	100	72.3	72.4	11	13	20	17.7
3 and above	47.2	41.7	0	0			0	0	27.7	27.6	89	87	80	83.3
Hypoxemia	0	19.4	2	21.6	21.2	33.1	0	8.4	9.4	33.5	39.3	45.2	7.7	9.1
Need for airway intervention	0	30.6	2	17.6			0.8	31.9	19.9	58.5	53.6	51.6	23.1	28.8

ERCP endoscopic retrograde cholangiopancreatography, EGD esophagogastroduodenoscopy, BMI body mass index, ASA American Society of Anesthesiologists, HFNC High-flow nasal cannula oxygen, SNC standard nasal cannula
*Unless otherwise indicated; ^#gastroscopy and colonoscopy; ^$median value

ISSN: 2047-783X