Clinical and polysomnographic characteristics in adults referred to the sleep laboratory: a single-center study

Background: Polysomnography is the gold standard diagnostic method for obstructive sleep apnea syndrome, and on-time treatment can help prevent further complications of obstructive sleep apnea. However, polysomnography is associated with some difficulties for the patients and physicians, which hinder its application. This study aimed to evaluate the clinical features and polysomnography findings of patients with obstructive sleep apnea. Methods: Data were retrospectively collected from polysomnography studies at the Sleep Laboratory of Namazi Hospital, Shiraz, Iran, from February 2013 to December 2017. Polysomnography was performed for any patients suspected of obstructive sleep apnea. The researcher reviewed the data extracted and selected the essential clinical features for the statistical analysis. The association of variables with the polysomnography findings was analyzed. Results: Significant associations were observed between the following factors and severity of obstructive sleep apnea: older age (p = 0.01), snoring (p = 0.122), history of sleep disorders (p = 0.11), no sedatives before sleep (p = 0.039), nocturia (p = 0.001), apnea (p = 0.035), no smoking (p = 0.039), no substance abuse (p = 0.011), hypertension (p = 0.001), cardiac diseases (p = 0.025), and overweight and obesity (p < 0.001). Conclusion: Considering the concomitant occurrence of obstructive sleep apnea with obesity, hypertension, cardiac disease, snoring, and observed apnea, polysomnography is recommended in these patients before further assessments.