Study on the time-point distribution characteristics of the occurrence of laryngopharyngeal reflux / 中华耳鼻咽喉头颈外科杂志

Objective: To investigate the characteristics of the time-point distribution of the occurrence of laryngopharyngeal reflux (LPR) by 24-hour multichannel intraluminal impedance-pH monitoring (24 h MII-pH) and to provide guidance for the development of individualized anti-reflux strategies for LPR patients. Methods: We conducted a retrospective analysis of 24 h MII-pH data from 408 patients [339 males and 69 females, aged 23-84 (55.08±11.08) years] attending the Department of Otorhinolaryngology Head and Neck Surgery at the Sixth Medical Center of the PLA General Hospital from January 2013 to March 2020. The number of gas acid/weak-acid reflux, mixed gas-liquid acid/weak-acid reflux, liquid acid/weak-acid reflux and alkaline reflux events at different time points were recorded and statistically analyzed through SPSS 26.0 software. Results: A total of 408 patients were included. Based on the 24 h MII-pH, the total positive rate of LPR was 77.45% (316/408). The type of positive gaseous weak-acid reflux was significantly higher than the remaining types of LPR (χ2=297.12,P<0.001). Except the gaseous weak-acid reflux, the occurrence of the remaining types of LPR showed a tendency to increase after meals, especially after dinner. Liquid acid reflux events occurred mainly between after dinner and the following morning, and 47.11% (57/121) of them occurred within 3 h after dinner. There was a significant positive association between Reflux Symptom Index scores and gaseous weak-acid reflux(r=0.127,P<0.01), liquid acid reflux(r=0.205,P<0.01) and liquid weak-acid reflux(r=0.103,P<0.05)events. Conclusions: With the exception of gaseous weak-acid reflux events, the occurrence of the remaining types of LPR events has a tendency to increase after meals, especially after dinner. Gaseous weak-acid reflux events accounts for the largest proportion of all types of LPR events, but the pathogenic mechanisms of gaseous weak-acid reflux are needed to further investigate.

Systematic Retrospective and Review of Anaphylactic Shock Induced by Cefazolin Sodium with Negative Skin Test / 中国药学杂志

OBJECTIVE: To systematicly review and analyse the clinical characteristics of anaphylactic shock induced by cefazolin sodium with negative skin test, and provide a basis for the safe and reasonable application of cefazolin sodium. METHODS: Databases of PUBMED, EMBASE, CBM, CNKI, VIP and WANFANG data(from built to October 2017)were conducted for case reports published in English or Chinese involving anaphylactic shock induced by cefazolin sodium. Literatures were screened, extracted and statistic analysed by two authors independently. RESULTS: A total of 1 358 literatures were searched out and 18 were included involving 20 patients, the median age was 39.0 years, 60.0% of the patients had no history of penicillin or drug allergy, and 30.0% of the patients had used penicillin or cephalosporin antibiotics, and intravenous infusion was the main route of administration. Anaphylactic shock occurred within 30 min accouted for 47.6%, and the longest time occurred on the 7th day of medication. The clinical manifestations were mainly circulatory system damage, and the rescue measures included discontinuation of medicine immediately, prostration, establishment of intravenous channels, oxygen uptake, administration of vasoactive drugs and glucocorticoids, etc., all of which were eventually successfully rescued.The correlation evaluation of ADR was definite and probable in 1 and 19 cases, respectively. CONCLUSION: High attention should be put on anaphylactic shock induced by cefazolin sodium with negative skin test. The proportion of young people and immediate anaphylactic shock were high.The cefazolin sodium skin test is of little value in predicting anaphylaxis. History of medication and allergies of patients should be taken in detail before medication, and the whole-process of medication, especially within 30 min should be closely monitored. Emergency rescue measures of anaphylactic shock should be prepared in advance.

A Systematic Retrospective Study and Review of Vancomycin Induced Thrombocytopenia / 中国药学杂志

OBJECTIVE: To review and analyze the clinical characteristics of thrombocytopenia induced by vancomycin. METHODS: Databases of PUBMED, EMBASE, CBM, CNKI, VIP and WANFANG data (from built to January 2017) were conducted for case reports published in English or Chinese involving thrombocytopenia induced by vancomycin. Literatures were screened, extracted and statistics analysis by two authors independently. RESULTS: A total of 2 428 literatures were searched out and 36 were included involving 37 patients. 70.3% of the patients were male, median age was 55.0 years, most of them had underlying diseases and combined with a variety of drugs, 62.2% of which combined with other antimicrobial agents.The clinical manifestation of ADR was thrombocytopenia or complete blood loss associated with or without bleeding symptoms, 45.9% patients were attacted by severe bleeding.The median time of thrombocytopenia for the first and second time was 7.0 d and 24.0 h, the median cumulative dosage was 8.0 g and 3.5 g, the median platelet counts was 23.0×109L-1 and 77.0×109L-1, respectively. The median time to platelet nadir counts for the first and second time was 9.0 d and 24.0 h, the median cumulative dosage was 16.0 g and 3.5 g, the median platelet counts was 10.0×109L-1 and 58.0×109L-1, respectively. The median time returned to normal platelet counts for the first and second time was 5.0 d and 4.5 d, respectively. For the third time, a single dose of vancomycin was administered and thrombocytopenia developed within 12 h with a nadir platelet counts of 11.0×109L-1, the platelet counts restored to normal within 7.0 d. Platelet counts returned to normal in 94.6% of patients after vancomycin was discontinued and/or took other measures, three of them died from various reasons but not the ADR of vancomycin. Vancomycin-dependent antibodies were detected in 59.5% of patients. The correlation evaluation of ADR was definite, probable, and possible in 4, 23, and 10 patients, respectively. CONCLUSION: High attention should be put on thrombocytopenia induced by vancomycin, male patients with middle or old age, underlying diseases, renal insufficiency and exposure to drugs were the risk factors of thrombocytopenia.Platelet counts should be closely monitored during the use of vancomycin. Testing for drug-dependent antibodies can be helpful for identifying the cause of thrombocytopenia in patients who were receiving vancomycin. More data is need to confirm the incidence and severity of thrombocytopenia induced by vancomycin.

Association analysis of the parkin gene in patients with sporadic Parkinson's disease from a Han population of Sichuan province / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To determine whether there are any associations between the -258T/G polymorphism of the promoter and the IVS3 -20T/C polymorphism in parkin gene and Parkinson's disease (PD) from a Han population in Sichuan province.</p><p><b>METHODS</b>Polymerase chain reaction (PCR), restriction fragment length polymorphism, denaturing high performance liquid chromatography(dHPLC) and sequence analysis were used to determine the genotype of each subject. The -258T/G polymorphism and IVS3 -20T/C polymorphism were analysed in 198 patients with sporadic PD and 187 healthy controls, matched for age and gender.</p><p><b>RESULTS</b>There were significant differences in allele frequency of the -258T/G polymorphism between PD patients and controls, with the G allele more common in cases than controls (52.5% vs 43.3%; chi square is 6.17, P< 0.025, OR is 1.45, 95% CI 1.04-1.86). There were also significant differences in G allele frequency between PD patients with onset age over 50 years old and controls(chi square is 9.048, P< 0.01, OR is 1.57, 95% CI:1.08-2.06). The frequency of TG+GG genotype was significantly higher in PD patients than in controls (78.79% vs 69.51%; chi square is 3.854, P< 0.05, OR is 1.63, 95% CI:0.88-2.38). In addition, there were significant differences in age of onset between PD patients with different genotypes (P< 0.05). The average age of onset in group of GG genotype was later about 5 years compared with the group of TT or TG genotype. The frequency of CC genotype in IVS3 -20T/C polymorphism was much higher than that of TC genotype. No TT genotype was found.</p><p><b>CONCLUSION</b>This study suggests that the parkin promoter -258T/G polymorphism might be a risk factor for late onset PD in Sichuan. CC genotype for IVS3 -20T/C polymorphism is common in Sichuan Han population. No TT genotype for IVS3 -20T/C polymorphism is found in Sichuan Han population.</p>

Cloning and Expression of Esterase Gene to Enantioselective Resolution of (S)-Ketoprofen in NK13 / 中国生物工程杂志

A strain NK13 was screened for a certain extent asymmetric hydrolyze the rac-ketoprofen chloroethyl ester and identified as Bacillus megaterium. For the preparation of gene libraries, a positive clones was obtained from the tributyrin flat. The sequence of this esterase gene had been analysised, and contained the whole ORF of an esterase gene with the length of 933bp. The esterase gene of NK13 was compared with the esterase genes of GenBank and the result showed that the esterase gene of NK13 was a novel gene(GenBank accession nember DQ196347).The new esterase gene was inserted into the plasmid pET21b+, then the recombinant plasmid transformed E.coli BL21. After being induced by IPTG, it was expressed in the host strain. SDS-PAGE analysis showed that the relative molecular mass of the esterase was about 34kDa. The result of TLC and HPLC showed that the recombinant strain had higher conversion ration than templet strain. 47.4%of the rac-ketoprofen Chloroethl ester was hydrolyzed to ketoprofen by the recombinant strain in 45min. The (S)- ketoprofen enantiomeric excess, in the later,was 55.46%, which indicated that the esterase could hydrolyze (S)-ketoprofen chloroethyl ester firstly.

The induction apoptosis of HL-60 cells by low molecular weight compounds of taurine, ornithine and carnosine from new born calf liver / 中国应用生理学杂志

<p><b>AIM</b>Clinical studies stated that low molecular weight compounds (< 1.0 kd) extracted from the new born calf liver could effectively inhibit the proliferation of tumor cells. In this report, we observed inhibition effects and their regulative mechanisms of taurine, ornithine, carnosine on the proliferation of HL-60 cells.</p><p><b>METHODS</b>Three active ingredients, i.e., taurine, ornithine and carnosine were separated by ion-exchange chromatographic column and identified from the low molecular weight filtrate of new born calf liver. MTT assay was used to test the survival rate of HL-60 cells and normal lymphocytes treated by the three ingredients. The various effects of the three compounds on HL-60 cells were respectively evaluated by agarose gel electrophoresis, ESR and immunohistochemical methods.</p><p><b>RESULTS</b>These compounds effectively inhibited the proliferation of HL-60 cells and induced apoptosis which was determined by apoptotic changes in morphology and nuclear DNA degradation. Whereas no inhibition effects on normal lymphocytes were observed. In addition, the results of ESR showed that the activity of oxygen radical within HL-60 cells treated with there compounds decreased to trace level. Furthermore, in the immunohistochemical experiments, we found that the level of p45/skp2 in HL-60 cells decreased while the level of p27/kip increased.</p><p><b>CONCLUSION</b>The taurine, ornithine and carnosine compounds can selectively suppress tumor cells proliferation by regulating the level of cell cycle proteins.</p>