Femtosecond laser small incision lenticule extraction (SMILE) with different residual stromal thicknesses (RST) is set to investigate its effect on corneal biomechanical properties of rabbits in vivo. In this study, 24 healthy adult Japanese rabbits were randomly divided into group A and B. The RST of group A was set 30% of the corneal central thickness (CCT), and the RST of group B was 50% of the CCT. The thickness of the corneal cap in both groups was set one third of CCT. Corneal visualization Scheimpflug technology (Corvis ST) and Pentacam three-dimensional anterior segment analyzer were used to determine corneal biomechanical and morphological parameters before surgery, and 1 week, 1 month and 3 months after surgery. Pearson correlation analysis was used to analyze factors affecting corneal biomechanical parameters after SMILE. The results showed that the corneal stiffness of group A was significantly higher than that of group B at 1 week and 1 month after surgery, and most biomechanical parameters returned to preoperative levels at 3 months postoperatively. The results of correlation analysis showed that postoperative CCT and RST were the main factors affecting corneal biomechanical parameters after SMILE. There was no significant difference in corneal posterior surface height (PE) between 3 months after surgery and before surgery in both two groups. It indicates that although the ability to resist deformation of cornea decreases in SMILE with thicker corneal cap and less RST, there is no tendency to keratoconus, which may be related to the preservation of more anterior stromal layer.
Objective To understand the current situation of medical service and management in Xintian Central Township Health Center (XtC) through on-the-spot investigation, and to provide references for development of key techniques and products for township health centers in medicine allocation and delivery. Methods The questionnaire and the focus interview were carried out, which included the general information, human resources, medical service and management, as well as the practice of essential medicine list. Results a) The hardware conditions of XtC were not good enough, and the income of Lintao county and Gansu provincial government fell short of their needs; b) The General Practitioner (GP)/nurse ratio was higher than that of the national level, the GP/pharmacist ratio was a little bit lower, and the GP/laboratorian ratio reached the national level. There was only one medical technician. There was about 27.5% staff members having no college degree, and about 81% having at most primary profession titles. There were 26 medical workers allocated to XtC in recent two years and only one GP left; c) In 2009, the bed utilization ratio was a little bit higher than the national level (109% vs. 60.7%), while the average length of stay was longer than the national level (6 vs. 4.8); d) The outpatient service in 2010 increased by 17.6% compared to 2009 and the inpatient service in 2010 decreased by 17%; e) The average medical expense per outpatient and per inpatient increased by 23.5% and 14.9%, respectively, in 2010 compared to 2009; f) The essential medicine list (EML) was put into practice in June, 2010. The current count of medicine in hospital was 767, far beyond the EML demand. Conclusion XtC, as a basic rural Township Health Center in Western China, overtakes the burden of healthcare service for local population. The policy of “selecting graduates to work in Township Health Center” made by Gansu government ensures sufficient personnel reserve for rural Township Health Center. XtC needs to cope with challenges of insufficient hardware conditions, unreasonable personnel structure, low educational background and profession title of the staff, and low technical level of medical service. XtC has a big ratio of medicine income and the expense of outpatient is lower than that of the national level. The management of XtC may be influenced by zero-profit price of the essential medicine, and appropriate subsidy and policy support are needed to maintain its service quality. And it is necessary to carry out evidence-based selection of the essential medicine account and develop staff training and essential medicine usage guidance, so as to support the medicine used safely and rationally.