Abstract
Purpose
Obstructive sleep apnea (OSA) is prevalent in the bariatric population. OSA should be recognized in patients undergoing bariatric surgery preoperatively to prevent peri- and post-operative complications. Lipid metabolism-related biomarkers are associated with OSA. Triglyceride metabolism is, among others, regulated by angiopoietin-like protein five (ANGPTL5). We aimed to evaluate the level of ANGPTL5 in patients with OSA of different severity levels before and after bariatric surgery.
Methods
We performed a single-center prospective cohort study including a consecutive series of patients who underwent bariatric surgery. We collected the clinical data, polysomnography (PSG) or polygraphy (PG) parameters, and plasma derived via venipuncture before and 6 to 12 months after surgery. Lipid profile, glucose levels, and ANGPTL5 levels were assessed. ANGPTL5 levels were measured using an enzyme-linked immunosorbent assay (ELISA).
Results
The study included 88 patients for analysis. The patients were divided into two subgroups: no or mild OSA (apnea–hypopnea index (AHI) < 15 events/hour, n = 57) and moderate-to-severe OSA (AHI ≥ 15 events/hour, n = 31). The ANGPTL5 level was higher in the moderate-to-severe OSA group (20.5 [15.6, 26.5] ng/mL) compared to the no or mild OSA group (16.3 [12.5, 19.4] ng/mL) (p = 0.008). A significant positive correlation was observed between ANGPTL5 and AHI (ρ = 0.256, p = 0.017), apnea index (AI) (ρ = 0.318, p = 0.003), and triglyceride levels (ρ = 0.240, p = 0.025). ANGPTL5 levels were reduced significantly after bariatric surgery in both moderate-to-severe OSA (15.6 [10.3, 18.7] ng/mL) and no or mild OSA (13.4 [9.2, 15.8] ng/mL) groups, though to a lower level in the group without or mild OSA. Post-surgery, the significant positive correlation between ANGPTL5 and AHI (ρ = 0.210, p = 0.047), AI (ρ = 0.230, p = 0.034), and triglyceride (ρ = 0.397, p < 0.001) remained.
Conclusion
The data showed increased levels of ANGPTL5 in patients with moderate-to-severe OSA. Both AHI and ANGPTL5 levels decreased significantly after bariatric surgery. We also report an association between ANGPTL5 levels and OSA severity.
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Abbreviations
- AHI:
-
Apnea-hypopnea index
- AI:
-
Apnea index
- ANGPTL:
-
Angiopoietin-like protein
- AUC:
-
Area under the curve
- BMI:
-
Body mass index
- CPAP:
-
Continuous positive airway pressure
- CVD:
-
Cardiovascular disease
- DDI:
-
Dasman Diabetes Institute
- ELISA:
-
Enzyme-linked immunosorbent assay
- HbA1C:
-
Glycosylated haemoglobin, type A1C
- HDL:
-
High-density lipoprotein
- HI:
-
Hypopnea index
- HIF:
-
Hypoxemia-inducible factor 1
- HsCRP:
-
High sensitivity C-reactive protein
- LDL:
-
Low-density lipoprotein
- LPL:
-
Lipoprotein lipase
- LRYGB:
-
Laparoscopic Roux-en-Y gastric bypass
- LSG:
-
Laparoscopic sleeve gastrectomy
- OSA:
-
Obstructive sleep apnea
- PG:
-
Polygraphy
- PSG:
-
Polysomnography
- ROC:
-
Receiver Operating Characteristic
- T2D:
-
Type 2 diabetes
- TGL:
-
Triglyceride
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Leentjens, M., Bosschieter, P.F.N., Al-Terki, A. et al. The association between biomarker angiopoietin-like protein five and obstructive sleep apnea in patients undergoing bariatric surgery. Sleep Breath 27, 1443–1454 (2023). https://doi.org/10.1007/s11325-022-02736-6
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DOI: https://doi.org/10.1007/s11325-022-02736-6