Table 1

Metabolic surgical studies reporting on weight loss and indices of sleep apnoea before and after surgery

Author	Metabolic operation	No of subjects	Follow-up (months)	BMI (kg/m²)		AHI (/h)
Author	Metabolic operation	No of subjects	Follow-up (months)	Preop	Postop	Preop	Postop
Harman et al, 198229	Jejuno-ileal bypass	4	24	NS	NS	78	1.4
Peiser et al, 198423	RYGB	15	2–4	NS	NS	81.9	15.0
Peiser et al, 198423	RYGB	6	4–8	NS	NS	81.9	5.5
Charuzi et al, 198526	RYGB	13	6	NS	NS	88.8	8.0
Charuzi et al, 198724	RYGB, VBG	46	6	NS	NS	58.8	36.1
Rubinstein et al, 198816	VBG or diet (unknown split)	12	NS	41	32	57	14
Summers et al, 199052	VBG	1	4	54	37	40	<5
Rajala et al, 1991^* 15	VBG	3	NS	52.2	34.23	44.67	5.33
Charuzi et al, 199225	RYGB, VBG	47	10.65	NS	NS	60.8	8.0
Charuzi et al, 199225	RYGB, VBG	6	12	NS	NS	60.3	12.4
Charuzi et al, 199225	RYGB, VBG	6	84	NS	NS	60.3	34.5
Sugerman et al, 1992^* 34	RYGB, VBG, HG	40	54	58	39	64	26
Pillar et al, 199432	RYGB, VBG	14	4.5	45	33	40	11
Pillar et al, 1994^* 32	RYGB, VBG	14	90	45	35	40	24
Noseda et al, 199653	VBG + CPAP Diet + CPAP	39 (3 VBG, 36 diet)	12	NS	NS	66.5	50.3
Scheuller and Weider, 200154	BPD, VBG	15	12–144	NS	NS	96.9	11.3
Rasheid et al, 2003^* 55	RYGB	11	3–21	62	40	56	23
Guardiano et al, 2003^* 56	RYGB	8	28	49	34	55	14
Valencia-Flores et al, 2004^* 35	RYGB, VBG	29	13.7	56.5	39.2	53.7	13.7
Busetto et al, 2005^* 57	Intragastric balloon	17	6	55.8	48.6	59.3	14
Dixon et al, 2005^* 27	Gastric banding	25	17.7	52.7	37.2	61.6	13.4
Lankford et al, 200558	RYGB	15	12	48	32	40 (CPAP:11 cm H₂0)	NA (CPAP:9 cm H₂0)
Kalra et al, 200559	RYGB	10	5.1	60.8	41.6	9.1 (median)	0.65 (median)
Poitou et al, 2006^* 60	RYGB, gastric banding	35	12	51.3	39.9	24.5	9.7
Haines et al, 2007^* 28	RYGB	101	6–42	56	38	51	15
Grunstein et al, 200750 (SOS Study)	RYGB, VBG, gastric banding	1592	24	42.2	32.5	24 (frequency apnoeas)	8.3 (frequency apnoeas)
Fritscher et al, 200761	RYGB	12	24.2	55.5	34.1	46.5 median (range 33–140)	16.0 median (range 0.9–87)
Martí-Valeri et al, 2007^* 31	RYGB	30	12	56.53	32.12	63.59	17.45
Valera et al, 200762	RYGB	56	12	49	NS	35	NS
Kuzniar et al, 200863	NS	1	7	44.5	29.4	44 (CPAP:16 cm H₂O)	NS (CPAP:8 cm H₂O)
Lettieri et al, 2008^* 30	Gastric banding	24	12	51	32.1	47.9	24.5
Rao et al, 200933	Gastric banding	46	12.6±20	45.2	30	38.11	13.18
Pallayova et al, 2011^* 64	RYGB, SG, BPD-DS	23	12	52.3	35.7	45.6	10.1
Weighted mean (random effects) postoperative change				↓16.09		↓34.22

↵* Studies reporting the postoperative changes of both BMI and AHI which were subsequently included in the analysis to derive the weighted mean change of BMI and AHI.
AHI, apnoea-hypopnoea index; BMI, body mass index; BPD, biliopancreatic diversion; CPAP, continuous positive airway pressure; DS, duodenal switch; HG, horizontal gastroplasty; NS, not specified; RYGB, Roux-en-Y gastric bypass; SG, sleeve gastrectomy; VBG, vertical banded gastroplasty.