Characteristics
Mean ± SD
Age (years)
47.2 ± 9.4
BMI
45.5 ± 7.3
Neck circumference (cm)
43.5 ± 4.8
Table 2 shows the polysomnographic results. Thirty-four percent (55 patients) had POSA. This was found to be significantly lower (p < 0.001) compared to the 53 % prevalence reported in the literature [5]. When comparing positional versus non-positional patients, BMI, neck circumference, and AHI were significantly different among these groups. Positional patients had a significantly lower BMI and neck circumference, and the AHI was lower in this group (Table 3).
Table 2
Polysomnographic results
Characteristics | Mean ± SD |
|---|---|
Total AHI | 31.5 ± 30.1 |
Desaturation index | 31.4 ± 28.6 |
Sleep efficiency (%) | 83.2 ± 11.0 |
Total sleep time (min) | 420.8 ± 87.0 |
Table 3
Comparison of demographics between positional and non-positional OSA patients before bariatric surgery
Characteristics | Positional OSA (n = 55, 34.0 %) | Non-positional OSA (n = 107, 76.0 %) | Mann–Whitney (p-value) |
|---|---|---|---|
Mean ± SD | Mean ± SD | ||
Age (years) | 46.00 ± 9.38 | 47.79 ± 9.40 | 0.265 |
BMI | 43.04 ± 5.66 | 46.71 ± 7.70 | 0.001 |
Neck circumference (cm) | 41.85 ± 3.75 | 44.28 ± 5.01 | 0.006 |
Total AHI | 19.26 ± 15.42 | 37.82 ± 33.69 | <0.001 |
Changes Following Bariatric Surgery
Of the 162 patients who underwent surgery, 43 patients were lost to follow-up or failed to obtain a postoperative PSG. Twenty-eight patients were excluded because they did not meet the inclusion criteria following surgery. In the remaining 91 patients, pre- and postsurgery PSG results were compared. There was an average follow-up interval of 7 months (SD ± 2.0) for PSG recording after surgery. Table 4 summarizes the comparison of both demographic and PSG results before and after surgery. A significant decrease in BMI, neck circumference, total AHI, and desaturation index is seen following surgery with an associated increase in sleep efficiency. These parameters were all improved after bariatric surgery. When looking specifically at BMI after surgery, 88 patients had a decrease of at least 1 point in their BMI, 2 patients had no change, and 1 patient had an increase in BMI. Regression analysis showed that only a low AHI was a significant independent predictor for POSA (p = 0.001). The Hosmer and Lemeshow Goodness-of-Fit test confirmed the model to be a good fit.
Table 4
Comparison of pre- and post-bariatric surgery results
Characteristics | Frequency (%) | Pre-BS (mean ± SD) | Post-BS (mean ± SD) | Wilcoxon signed ranks (p-value) |
|---|---|---|---|---|
Gender | ||||
Male | 18 (19.8) | |||
Female | 73 (80.2) | |||
BMI | 45.2 ± 6.7 | 36.0 ± 5.8 | <0.001 | |
Neck circumference (cm) | 43.1 ± 4.4 | 39.5 ± 4.0 | <0.001 | |
Total AHI | 29.6 ± 27.1 | 10.3 ± 10.5 | <0.001 | |
Desaturation index | 27.7 ± 26.0 | 9.5 ± 9.1 | <0.001
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