Blood pressure after surgery among obese and nonobese children with obstructive sleep apnea.

OBJECTIVES: Treating obstructive sleep apnea in children is found to be associated with blood pressure decreases. However, exactly how adenotonsillectomy (T&A) affects blood pressure in obese and nonobese children remains unclear. This study assesses how obesity affects blood pressure in children with sleep apnea after T&A.

STUDY DESIGN: Case series with chart review.

SETTING: A tertiary referral center.

SUBJECTS AND METHODS: From 2010 to 2012, a total of 78 children were included. Based on propensity score methods (age, sex, and preoperative apnea-hypopnea index matched), children were assigned to either the obese group (n = 39) or the nonobese group (n = 39). All children received adenotonsillectomy. We recorded clinical symptoms, preoperative overnight polysomnography (PSG), and subsequent PSG within 3 months after T&A. We measured blood pressure 3 times before PSG (nocturnal blood pressure) and after PSG (morning blood pressure) in a sleep laboratory.

RESULTS: Following surgery, the nonobese group had a significantly decreased nocturnal diastolic blood pressure (DBP) index (-12.0 to -18.8, P = .018), morning systolic blood pressure (SBP; 111.1 to 105.8 mm Hg, P = .014), SBP index (-5.4 to -10.9, P = .008), and DBP (-12.0 to -18.7, P = .023). Nevertheless, all blood pressure parameters in the obese group were not significantly changed postoperatively. The nonobese group improved more than obese group in nocturnal and morning DBP and DBP index by 2-way analysis of variance.

CONCLUSION: Among the children receiving T&A as treatment for OSA, nonobese children improved more than obese children did in terms of blood pressure, allowing us to infer that obese children with OSA may benefit less from T&A in cardiovascular morbidities.