Utility of Screening Questionnaires to Detect Obstructive Sleep Apnea in Patients with Obesity

Obesity is one of today's most concerning health problems due to increased cardiovascular risk, which is still the leading cause of death. Obstructive sleep apnea syndrome (OSAS) is certainly one of the important risk factors that links obesity and cardiovascular risk. There is a great need to evaluate obstructive sleep apnea (OSA) in obese patients. Today, there are easily available and applicable questionnaires (Epworth Sleepiness Scale (ESS), STOP, STOP-Bang (SBQ), Insomnia Severity Index (ISI) and Pittsburgh Sleep Quality Index (PSQI)) that could be very useful in clinical practice for this very purpose. The aim of this paper is to investigate the sensitivity and specificity of the questionnaires for OSA screening in obese patients with and without OSA.

This cross-sectional study was carried out in the tertiary healthcare centre. The following questionnaires were used: ESS, STOP, SBQ, ISI, PSQI. 70 (58 female) adult patients with obesity (body mass index (BMI) > 30 kg/m2) were included.

SBQ showed sensitivity of 75%, specificity of 75% at cut-off of 5.5 with the Youden index of 0.5, while PSQI had sensitivity of 78%, specificity of 67% at cut-off of 17.75 with slightly smaller Youden index 0.45. STOP and ESS had a sensitivity of 77% and 75%, respectively but with an even smaller Youden index (0.23 and 0.21), and ISI had the lowest sensitivity of 59% and the lowest Youden index (0.13) of the questionnaires we examined.

Our study results suggest that SBQ and PSQI are best screening tools in detecting OSA in patients with obesity. Further study of these questionnaires and possible modifications are certainly important for future research.