Relationship of platelet-lymphocyte ratio with severity of obstructive sleep apnea syndrome.

Objective: Objective of study was to assess the inflammation in obstructive sleep apnea syndrome patients by using platelet lymphocyte ratio and relationship between platelet lymphocyte ratio and severity of obstructive sleep apnea. Study Design: Cross sectional study Place and Duration: Pulmonology department of Nishtar Hospital Multan and Jinnah Hospital, Lahore  from June 2018 to March 2019. Methods: This cross sectional study was conducted in Pulmonology department of Nishtar Hospital Multan from June 2016 to March 2017.Total 280 patients were selected by non-probability consecutive sampling. All patients underwent whole night polysomnography. Patients were divided into control group (AHI 30) according to their AHI score. Numerical variables like age, body mass index, white cell count, platelets, hemoglobin (Hb) and platelet lymphocyte ratio were statistically analyzed by mean and standard deviation and t-test applied to assess their significance. Qualitative variables like gender and smoking status were statistically analyzed by frequency and percentage. Chi square test was applied to check the significance. P value <0.05 was regarded as significant. Results: Platelet lymphocyte ratio was significantly raised in patients with obstructive sleep apnea syndrome. There was significant correlation between platelet lymphocyte ratio and AHI (p<0.05). So study showed that there was significant association between obstructive sleep apnea syndrome severity (represented by AHI) and systemic inflammation (represented by PLR). Significant differences were found between age (p =0.000), ESR (p =0.000), CRP (p =0.003), Cholesterol (p =0.000), Platelets (p =0.048), Hb (p =0.000), PLR (p =0.000) and white blood cells (p =0.000), in groups. Association was found between gender (p =0.000) and smoking status (p =0.030) in groups. So, gender and smoking were the effect modifiers. Conclusion: the observations of our study suggest that Platelet lymphocyte ratio was significantly raised in patients with obstructive sleep apnea syndrome. There was significant correlation between platelet lymphocyte ratio and AHI (p<0.05). So study showed that there was significant association between obstructive sleep apnea syndrome severity (represented by AHI) and systemic inflammation (represented by PLR). Key words: Obstructive sleep apnea syndrome, Platelet lymphocyte ratio, polysomnography DOI : 10.7176/JMPB/54-08 Publication date : April 30 th 2019