Objective To explore the effect of humidification of oxygen delivered by nasal cannula on the respiratory symptoms. Method A total of 540 patients receiving low-to-mid flow oxygen therapy (<4L/min) by nasal cannula for more than 12 hours were assigned to receive humidified (n=235) or dry (n=305)oxygen. While 226 patients receiving a low-to-mid flow oxygen therapy for more than 24 hours received humidified or dry oxygen respectively. The patients' respiratory symptoms were observed and recorded. Results Dryness over naso-pharyngeal region was the only symptom reported by patients in this study. There was no significant difference on the rate of dryness over naso-pharyngeal region between patients receiving humidified oxygen and patients receiving dry oxygen (P>0.05) either in the same patients when receiving dry and humidified oxygen (P>0.05). Conclusion Routine humidification is not necessary in low-to-mid flow oxygen therapy by nasal cannula.

Objective To discuss influence of the humidification or non-humidification on oxygen humidity during low-mid volume oxygen inhalation through nasal cannula.Methods A total of 160 patients with low-mid volume oxygen inhalation through nasal cannula for≥12 hours were randomly assigned to the humidified group and the un-humidified group with 80 patients in each.Recording the chases of oxygen humidity from the humidifying bottles.at the same time the indoor air humidity was also observed.Influence of the humidification or non-humidification on oxygen humidity during low-mid volume oxygen inhalation through nasal cannula was observed.Results There was not significant difference in oxygen humidity between the two groups.Conclusions Routine humidifying is not necessary in low-mid volume oxygen inhalation through nasal cannula.

Background The introvitreal injection of triamcinolone acetonide (TA) before vitrectomy for retinal with choroidal detachment (RD/CD) can alleviate inflammatory response,but it easily lead to complications under the low intraocular pressure.The study on the efficiency and safety of subtenon injection of TA for treatment of RD/CD is lack.Objective This study was to evaluate the efficiency and safety of subtenant injection of TA with vitrectomy for treatment of RD/CD.Methods A retrospective study was adopted.The data of 22 eyes of 22patients who received subtenon injection of TA with vitrectomy for RD/CD were collected and analyzed in Affiliated Eye Hospital of Wenzhou Medical University from May 2010 to June 2014.TA of 40 mg in 0.4 ml was administered subtenantly 5 days before RD repair surgery.After initiating the treatment,the therapeutic effects on uvitis were analyzed.Intraocular pressure was monitored and CD height and range were determined by B type ultrasonography before injection and 5 days after injection respectively.In addition,blood glucose and blood pressure of the patients were evaluated.Results Ocular inflammation alleviated to some degree after TA injection in all 22 eyes.The mean intraocular pressure was (5.4±2.9) mmHg (1 mmHg =0.133 kPa) in pre-injection and (8.2±4.3) mmHg in postinjection,showing a significant difference between them (t =3.430,P ＜ 0.01).The mean maximum CD height was 5.2 (3.1,6.6)mm in pre-injection and 0.9 (0,3.8)mm in post-injection,with a significant difference between the before and after injection (Z=-4.198,P＜0.01).The mean CD range was 12 (10,12) clock before injection and 3(0,6) clock after injection,and no significant difference was found between before and after injection (all at P＞0.05) (Z=-4.124,P＜0.01).There were no statistically significant difference in the changes of blood glucose and blood pressure between before and after injection.The LogMAR visual acuities were 2.14±0.46,1.29±0.57 and 1.17±0.55 before injection and 1 month,3 months after injection,respectively,with a siginificant difference among them (F =22.060,P＜0.001).The retinal reattachment rate was 95.5 ％.Conclusions Subtenon injection of TA seems to be a good option for perisurgical management of RD/CD patients,which can alleviate uvitis,increase intraocular pressure,reduce CD height and CD range.