Perinatal prevalence of birth defects in the Mainland of China, 2000-2021: a systematic review and meta-analysis.

Background: Although birth defects are of great concern globally, the latest national prevalence has not yet been quantified in China. We conducted a systematic review and meta-analysis to estimate the perinatal prevalence of birth defects in the Mainland of China between 2000 and 2021.

Methods: We performed a systematic literature search of six databases for relevant articles published between January 1, 2000, and March 1, 2023.

Association between air particulate matter pollution and blood cell counts of women preparing for pregnancy: Baseline analysis of a national birth cohort in China.

Background: Limited evidence is known about whether long-term exposures to air borne particulate matters of 2.5 μm or less (PM) impact human hematologic index for women preparing for pregnancy. No study assessed the effect of PM, which is small enough to reach the blood circulation.

Association between airborne particulate matter and renal function: An analysis of 2.5 million young adults.

Background: Limited studies have examined the impact of airborne particulate matter of 2.5 μm or less (PM) on renal function. No study has examined the effect of PM, which is small enough to reach the blood circulation.

Folic Acid Supplementation and the Association between Maternal Airborne Particulate Matter Exposure and Preterm Delivery: A National Birth Cohort Study in China.

Background: Potential modification of the association between maternal particulate matter (PM) exposure and preterm delivery (PTD) by folic acid (FA) supplementation has not been studied.

Objective: We examined whether FA supplementation could reduce the risk of PTD associated with maternal exposure to PM in ambient air during pregnancy.

Method: In a cohort study covering 30 of the 31 provinces of mainland China in 2014, 1,229,556 primiparas of Han ethnicity were followed until labor.

Ambient temperature and the risk of preterm birth: A national birth cohort study in the mainland China.

Background: Little is known about the effect of ambient temperature on preterm birth, especially for the trimester-specific effects.

Objective: To evaluate whether exposure to relatively low or high temperature during pregnancy is associated with increasing risk of preterm birth or not.

Method: We analysed the data of a birth cohort with 1,281,859 singleton pregnancies during 2013-2014 and matched the home address of each pregnant women to the model based daily meteorological and air pollution data.

Long-term exposure to airborne particulate matter of 1 μm or less and blood pressure in healthy young adults: A national study with 1.2 million pregnancy planners.

No evidence exists concerning the effect of airborne particulate matter of 1 μm or less (PM) on blood pressure of young adults planning for pregnancy. We collected health examination information of about 1.2 million couples (aged 18-45 years) from a national birth cohort in China from Jan 1, 2013 to Oct 1, 2014 and matched their home address to daily PM and PM concentrations, which were predicted by remote sensing information.

Seroepidemiology of Syphilis Infection among 2 Million Reproductive-age Women in Rural China: A Population-based, Cross-sectional Study.

Background:: Quantifying syphilis prevalence is important for planning interventions and advocating for resources on syphilis. However, data on large sample studies regarding the prevalence of syphilis among reproductive-age women in rural China were not available for analysis. The aim of the study was to determine the prevalence, epidemiological characteristics, and related factors of syphilis infection among reproductive-age women in rural China.

Status of HBsAg seroprevalence in 15 million rural couples in China: a cross-sectional study.

A cross-sectional analysis of prevalence of hepatitis B virus infection (HBV) among rural couples was conducted between 2010 and 2014. Serologic HBV markers, including hepatitis B surface antigen (HBsAg) and e antigen (HBeAg), were tested. Primary outcome of interest comprised HBsAg positivity in couples (both positive: F+M+, only wife positive: F+M-, only husband positive: F-M+), and secondary outcome consisted of prevalence and risk factors of HBsAg positivity among husbands or wives.

[Clinical application of extracted site preservation in dental implantation].

Purpose: To introduce the method of extracted site preservation in dental implantation.

Methods: One hundred and fifty implants in 63 patients were placed by minimally invasive extraction, immediate implantation and guided bone regeneration for extracted site preservation. All the patients were followed-up for 1 year.

[Clinical investigation of root retention or removal during impacted mandibular third molar extraction].

Purpose: To investigate the indication of root retention or removal during impacted mandibular third molar (IMTM) extraction and the relationship between the IMTM root and damage of mandibular alveolar nerve.

Methods: The data of roots from 135 cases performing IMTM extraction were retrospectively analyzed to compare the location relationship between the IMTM and the mandibular canal.

Results: (1)The relationship of 135 cases between the IMTM and the mandibular canal on panoramic radiographs was defined in three types, no contact type in 99 cases of IMTM(73%), point-contact type in 21 cases of IMTM(16%), and superimposition or line-contact type in 15 cases of IMTM(11%); (2)The roots of extracted IMTM were preserved in 18 cases(13%);(3)One month after the extraction of IMTM root, paresthesia in the lower lip disappeared in 17(94%) cases; 1 case had the symptom white resolved 8 months later.

[Stray light and bandpass correction in the spectral measurement for light emitting diodes].

The present paper introduces the stray light and bandpass correction methods for spectrometers. The line spread function of spectrometer is characterized by a He-Ne laser. Assuming that the spectrometer is a wavelength invariable system, the stray light distribution matrix is constructed by the derived line spread functions.

[Investigation of indication for emergency surgical treatment of condylar fracture].

Purpose: To investigate the indication for emergency surgical treatment of condylar fracture.

Methods: Eight patients with single condylar fracture and 3 patients with bilateral condylar fracture underwent emergency surgical treatment, the results were evaluated through radiographs and clinical examination.

Results: The mouth opening was normal with good occlusion,condylar anatomical contour was rehabilitated.

Tissue microarrays in pathological examination of apoptotic acinar cells induced by dexamethasone in the pancreas of rats with severe acute pancreatitis.

Background: The good therapeutic effects of large dose of dexamethasone on severe acute pancreatitis (SAP) patients have been proved. This study was designed to investigate the influence of dexamethasone on apoptosis of acinar cells in the pancreas of rats with SAP and the protein expression of the apoptosis-regulating genes Bax and Bcl-2.

Methods: Ninety Sprague-Dawley rats with SAP were randomly divided into a model group and a dexamethasone treated group (45 rats in each group), and another 45 rats formed the sham operation group.

Study of the protective effects of dexamethasone on multiple organ injury in rats with severe acute pancreatitis.

Context: Pancreas, lung, kidney and liver injury has been proven to play an important role in severe acute pancreatitis.

Objective: To observe the protective effects of dexamethasone on multiple organs (pancreas, lung, kidney and liver) in rats with severe acute pancreatitis.

Animals: One hundred and thirty-five Sprague-Dawley rats.

Application of tissue microarrays to study the influence of dexamethasone on NF-kappaB expression of pancreas in rat with severe acute pancreatitis.

To discuss the influence of dexamethasone on NF-kappaB expression of pancreas in rat with severe acute pancreatitis (SAP). Ninety rat SAP models were divided into the model group and dexamethasone treatment group with 45 rats in each group; another healthy 45 rats were selected to be the sham operation group. The groups were divided into the 3, 6 and 12 h group with 15 rats in each group.

Influence of dexamethasone on inflammatory mediators and NF-kappaB expression in multiple organs of rats with severe acute pancreatitis.

Aim: To observe the therapeutic effects of dexamethasone on rats with severe acute pancreatitis (SAP) and investigate the influences of dexamethasone on the inflammatory mediators and NF-kappaB expression in multiple organs of SAP rats as well as the mechanisms involved.

Methods: Ninety Sprague-Dawley (SD) rats with SAP were randomly divided into the model group (n = 45) and dexamethasone treatment group (n = 45), and another 45 rats were selected for the sham operation group. All groups were randomly subdivided into the 3 h, 6 h and 12 h groups, each group containing 15 rats.

[Clinical study on the causes and treatment of endodontic interappointment emergencies].

Objective: To investigate the causes and the treatment of endodontic interappointment emergencies.

Methods: An analysis were made for 55 teeth with endodontic interappointment emergencies. The root canals were sealed with dexamethasone and metronidazole,and filled with Vitapex add gutta-percha point after one week.