Respiratory disturbance during sleep in COPD patients without daytime hypoxemia

Figures & data

Table 1 Baseline characteristics of all subjects by group

	Total			COPD			Non-COPD controls
	N	Mean	SD	N	Mean	SD	N	Mean	SD
Age (yrs)	26	63.88	10.74	13	63.54	10.91	13	64.23	11.01
Body Mass Index (kg/m^2)	26	31.31	5.03	13	30.85	5.32	13	31.77	4.88
TST (min)	26	318.96	90.51	13	338.31	51.80	13	299.62	116.50
SE (%)	26	71.81	16.39	13	75.71	10.88	13	67.90	20.21
RDI (events/hour)	26	47.40	31.55	13	40.92	29.57	13	53.88	33.29
AHI (events/hour)	26	44.97	32.56	13	38.23	30.23	13	51.70	34.60
RERA (events/hour)	26	2.43	3.71	13	2.68	2.91	13	2.18	4.47
Non-REM RDI (events/hour)	26	46.88	32.30	13	40.16	30.64	13	53.60	33.71
REM RDI (events/hour)	24	48.09	26.36	12	44.92	24.18	12	51.27	29.08
Awake mean SaO2 (% Hgb)	26	94.03	2.30	13	94.09	2.03	13	93.97	2.63
Mean SaO2 during sleep (% Hgb)	26	93.19	2.57	13	93.35	1.98	13	93.03	3.12
TST at SaO2 < 90% (min)	26	33.38	52.79	13	28.42	23.67	13	38.33	72.05
Percentage of TST at SaO2 < 90% (% Hgb)	26	11.08	14.94	13	8.10	6.60	13	14.07	20.05
Lowest SaO2 during non-REM sleep (% Hgb)	26	77.27	9.21	13	79.62	8.19	13	74.92	9.89
Lowest SaO2 during REM sleep (% Hgb)	24	81.08	10.01	12	81.50	9.41	12	80.67	10.98
FEV1 (liters)	26	2.55	0.80	13	2.30	0.79	13	2.80	0.75
FVC (liters)	26	3.53	1.03	13	3.59	1.08	13	3.46	1.02
FEV1(% predicted)	26	75.77	20.1	13	66.77	18.27	13	84.77	18.33

Figure 1 Boxplots of AHI, RDI, non-REM RDI and REM RDI in COPD subjects vs control subjects.

Figure 2 Boxplots of TST < 90 (% and min) in COPD subjects vs control subjects.

Figure 3 Boxplots of lowest SaO₂ (Non-REM and REM).

Figure 4 Severity of sleep apnea (AHI) plotted against BMI in both groups shows a better correlation in the control group (r = 0.75) (a) than COPD (r = 0.60) (b).