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Objective: To investigate the clinical characteristics and risk factors of cytomegalovirus (CMV) reactivation in immunocompetent patients in respiratory intensive care unit (RICU). Methods: Clinical data of immunocompetent patients whose serum CMV-DNA was monitored during hospitalization in the RICU of Peking University First Hospital from July 2014 to July 2018 were collected and reviewed in this retrospective study. Patients were divided into the CMV reactivation group and non reactivation group. Demographics, clinical features, and outcomes of patients in the two groups were analyzed. The multivariable logistic regression analysis was used to analyze the independent risk factors for CMV reactivation. Results: Of the 81 patients, 11 (13.6%) were in the reactivation group and 70 (86.4%) were in the non reactivation group. Length of RICU stay were longer in the group with CMV reactivation compared to patients without CMV reactivation [54(50, 68) vs 32(17, 43) d, P= 0.012]. Baseline demographic and disease characteristics, rate of ventilator-associated pneumonia, duration of mechanical ventilation and mortality were similar in the two groups. Multivariable logistic regression analysis showed that blood transfusion ( OR= 11.481, 95 %CI : 1.154-114.201; P= 0.037) and corticosteroids use ( OR= 13.952, 95 %CI : 2.301-84.609; P= 0.004) were independent risk factors for CMV reactivation. Conclusions: CMV reactivation is associated with a longer stay in the RICU in immunocompetent patients, blood transfusion and corticosteroids use constitute risk factors.

Objective: To explore the short-term effects of fine particulate matter (PM2.5) exposure on pulmonary function of healthy young adults in Beijing. Methods: In this time series study, twenty-four healthy young adults who living around Guanyuan area were investigated in Beijing. The follow-up study was lasted for 12 days in total from Nov. 28, 2016 to Dec. 9, 2016, and pulmonary spirometry and inpulse oscillometry parameters were measured daily. Air pollution data (including PM2.5, etc.) and meteorological data (temperature, humidity, etc.) were monitored based on Guanyuan monitoring site. The short-term effects of PM2.5 on pulmonary ventilation function and airway resistance of healthy young adults were analyzed by using generalized estimating equation (GEE). Results: In our study period, average daily concentration of PM2.5 were 100.7 μg/m(3). The single pollutant model showed that there were negative dose-response associations between PM2.5 concentration and forced vital capacity (FVC) and forced expiratory volume in one second (FEV(1)); and there were negatively correlated with daily mean level of PM2.5 lagged 0-1 days, and the strongest negative effect was in lag0. At lag0 day, each 10 μg/m(3) increase in PM2.5 concentration was associated with a significant decrease in FVC of 12.186 (95% CI : -15.573, -8.799) ml and in FEV(1) of 9.449 (95% CI: -13.265, -5.634) ml. Moreover, there were positive dose-response associations between PM2.5 concentration at lag0 to lag2 and peripheral resistance (Rp) , resonance frequency (Fres) and the fall in resistance between resistance at 5 Hz (R5) and resistance at 20 Hz (R20) (R(5-20)). And the strongest negative effect was in lag0. Each 10 μg/m(3) increase in PM2.5 concentration was associated with a significant increase in Rp of 2.444 (95% CI: 0.889, 3.999) Pa·L(-1)·s(-1) , Fres of 0.125 (95% CI: 0.082, 0.168) Hz and R(5-20) of 1.074 (95% CI: 0.444, 1.703) Pa·L(-1)·s(-1) at lag0 day. Conclusion: Short-term PM2.5 exposure has a negative and lagged effect on pulmonary function in healthy young adults.