Objective To study the pathology and possible mechanism of experimental hydrochloric acid（HCl） inhalation-indued pulmonary fibrosis in rats.Methods 120 male SD rats were randomly divided into a nomal control group，a bleomycin group，a high dose HCl group，a middle dose HCl group and a low dose HCl group.The bleomycin group was intratracheally injected with bleomycin once to induce pulmonary fibrosis.The three HCl groups were intratracheally injected with HCl once per week.The control group was given saline by the same way.Six rats of each group were randomly sacrificed on day 7，14，28 and 42 respectively.The histological changes of lung tissue were studied by HE and Masson’s trichrome staining.Hydroxyproline level in lung tissue was measured by digestion method.Protein and mRNA expression of transforming growth factor-β1（TGF-β1） were assayed by immunohistochemistry and RT-PCR respectively.Results Alveolitis in three HCl groups was significantl compared to control group，most severe at the second week，then remained at a high level which was equivalent to or exceeded the level of the bleomysin group after 28 days.Pulmonary fibrosis in three HCl groups was also significantly more severe than that in the control group，but milder than that in the bleomysin group.The high-dose and middle-dose HCl groups were not significantly different from the bleomysin group on day 42.There was no difference between three HCl groups in the earlier period，but the high-dose HCl group has a significantly difference from low-dose group on day 42.The content of hydroxyproline in high-dose and middle-dose HCl groups was also significantly higher than that in the control group.On day 42 hydroxyproline content in high-dose HCl dose rather middle –or low dose group was similiar with the level of bleomysin group.Content of TGF-β1 mRNA in three HCl groups was comparable to the level of bleomysin group on day 28 and exceeded on day 42.The expression of TGF-β1 in three HCl groups was not significantly different from the bleomysin group on day 42.Conclusion Experimental acid aspiration might contribute to pulmonary fibrosis in rats.Acid induced alveolar epithelial cell damage，abnormal proliferation and repair and fibrosis could be involved..
Objective To improve the knowledge of pulmonary benign metastasizing leiomyoma.Methods A case of pulmonary benign metastasizing leiomyoma diagnosed in the First Affiliated Hospital of Nanjing Medical University was analyzed.Results A 32-year-old woman suffered from chest stuffiness,heavy pant and weakness after myomectomy in amonth. Chest CT showed miliary shadowwas diffused in both sides of her lungs, but serumtumor marker was normal. When the chest CT result did not change significantly after four-week’s anti-tuberculosis treatment, the patient accepted lung biopsy by thoracoscopic surgery. HE staining showed that the tumor cells had characteristics of smooth muscle cell differentiation.Immunohistochemical staining showed a low proliferation index of tumor cells, which did not indicate theexistence of pulmonary malignant tumor. Smooth muscle actin ( SMA) and desmin as the specific markers of smooth muscle, estrogen receptor ( ER) and progesterone receptor ( PR) were all bly positive, which was the characteristic of pulmonary benign metastasizing leiomyoma. The patient was given the anti-estrogen tamoxifen for 3 months.Without radiological evidence of disease development and further distant metastasis,the patient had been followed up. Conclusions Pulmonary benign metastasizing leiomyoma is a rare disease which can occur in any age group, particularly prevalent among late childbirth women. All patients have uterine leiomyoma history and/ or myomectomy operation, often associated with uterine metastasis, which commonly occurs in lung.
ObjectivesTo systematically review the prevalence of senile pruritus (SP) in Chinese population.MethodsPubMed, EMbase, CENTRAL, CINAHL, CBM, CNKI, WanFang Data and VIP databases were electronically searched to collect cross-sectional studies on the prevalence of SP in Chinese population from inception to May 2019. Two reviewers independently screened literature, extracted data and assessed risk of bias of included studies, then, meta-analysis was performed by Stata 12.0 software.ResultsA total of 11 studies involving 13 398 patients were included. The results of meta-analysis showed that, the overall prevalence of SP was 31.0% (95%CI 18.0% to 44.0%). Subgroup analysis showed that the prevalence rate of male was 34.9% (95%CI 18.6% to 88.5%). The prevalence rates of SP among 60, 70, 80 and 90 age groups were 20.0% (95%CI 14.2% to 25.7%), 48.4% (95%CI 21.5% to 75.3%), 53% (95%CI 12.4% to 93.5%), and 58.5% (95%CI 22.4% to 94.6%), respectively. The prevalence rates of SP in community, hospital and cadre relaxation club were 33.4% (95%CI 31.3% to 35.6%), 40.4% (95%CI 22% to 58.7%), and 14.4% (95%CI 1.1% to 27.7%), respectively. The prevalence rates of SP in southern China and northern China were 26.7% (95%CI 18.7% to 34.7%) and 36.8% (95%CI 21.8% to 51.7%), respectively.ConclusionsThe overall prevalence rate of SP in the Chinese population is high. The prevalence rates of SP among ages, regions and research sites are different.