Reactive oxygen species(ROS) in the cardiac muscle are increased in cardiovascular diseases such as hypertension,coronary heart disease and heart failure.Oxidative stress mediates myocyte hypertrophy,myocyte apoptosis and interstitial fibrosis.And these changes are particularly pronounced in elderly patients or senescent animal disease models.The major sources of ROS in myocardium are mitochondria and the reduced nicotinamide adenine dinucleotide phosphate(NADPH) oxidase.Specific ROS such as hydrogen peroxide play an important role in myocardial remodeling in heart failure.Oxidative modifications of calcium handling proteins result in reduction of their activities,leading to decreased myocardial contractility.Reduction of oxidant levels and inhibition of oxidative modifications of specific proteins through inhibiting ROS sources may provide new strategies for the treatment of myocardial remodeling.

Objective To observe the effect of power-assisted functional electrical stimulation (PAFES)therapy on ankle joint function recovery in stroke patients.Methods Ninety hemiplegic stroke patients were randomly and evenly divided into a control group,a PAFES group,and a neuromuscular electrical stimulation (NMES)group.All groups received conventional rehabilitation training.PAFES group adopted PAFES treatment on affected lower extremities and NMES group was given the NMES therapy on the tibialis anterior of the affected lower limbs,in addition to conventional rehabilitation training.The active range of motion (AROM) of ankle dorsiflexion,FuglMeyer motor assessment (FMA),Barthel index (BI) and Ankle flexion and extension movement (AFEM) in 10 seconds were evaluated before the trial and after 4 weeks treatment.Results After treatment,there were significant differences in the AROM of ankle dorsiflexion,FMA,BI and AFEM (P ＜ 0.05) compared with before treatment within each group.The improvement of AROM of ankle dorsiflexion in PAFES group (8.19 ± 3.39) ° and the values in NMES group (8.96 ± 3.68) ° were to a significantly greater extend than control group (3.88 ± 4.10) ° (P ＜0.05) ; the improvement of FMA and BI in PAFES group was also superior to those in NMES group and control group (P ＜ 0.05).Conclusion The intelligent PAFES therapy could help improve AROM of ankle dorsiflexion,the motor function of the affected lower extremity and the ability of the activities of daily living in stroke patients.

Streptococcus pneumoniae(S.pn) is an opportunity pathogenic bacteria,environmental factors play a key role in the pathogenicity of S.pn. It is important to study virulent gene in vivo. The S.pn suicide plasmid containing gfp reporter was constructed by fusing the genes pneumolysin and gfp,in which gfp is an excellent molecule probe in vivo. The plasmid was integrated to No.22 S.pn by homologous recombination. The recombinant S.pn was gained and evaluated in aspects of fluorescence excitation, biological character and physio-activity. The results showed it is efficient and available to report the expression of virulent genes in vivo and in vitro, which will provide a new easy method for evaluating and screening the virulent genes of S.pn in vivo.

Objective To investigate the levels of serum vascular endothelial growth factor(VEGF) and basic fibroblast growth factor(bFGF) in patients with non-small cell lung cancer(NSCLC) and relationships with c1inicopatho1ogica1 characteristics and their clinical significance. Methods The concentrations of serum VEGF and bFGF were detected by enzyme-linked immunosorbent assay(ELISA) in 40 patients with NSCLC before and after chemotherapy. Results The level of serum VEGF in patients with Ⅳ stage NSCLC was significantly higher than that of Ⅲ stage(P

The coronavirus disease 2019 (COVID-19) is an acute infectious disease caused by the new severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection, which has led to serious worldwide economic burden. Due to the continuous emergence of variants, vaccines and monoclonal antibodies are only partial effective against infections caused by distinct strains of SARS-CoV-2. Therefore, it is still of great importance to call for the development of broad-spectrum and effective small molecule drugs to combat both current and future outbreaks triggered by SARS-CoV-2. Cathepsin L (CatL) cleaves the spike glycoprotein (S) of SARS-CoV-2, playing an indispensable role in enhancing virus entry into host cells. Therefore CatL is one of the ideal targets for the development of pan-coronavirus inhibitor-based drugs. In this study, a CatL enzyme inhibitor screening model was established based on fluorescein labeled substrate. Two CatL inhibitors IMB 6290 and IMB 8014 with low cytotoxicity were obtained through high-throughput screening, the half inhibition concentrations (IC₅₀) of which were 11.53 ± 0.68 and 1.56 ± 1.10 μmol·L^-1, respectively. SDS-PAGE and cell-cell fusion experiments confirmed that the compounds inhibited the hydrolysis of S protein by CatL in a concentration-dependent manner. Surface plasmon resonance (SPR) detection showed that both compounds exhibited moderate binding affinity with CatL. Molecular docking revealed the binding mode between the compound and the CatL active pocket. The pseudovirus experiment further confirmed the inhibitory effects of IMB 8014 on the S protein mediated entry process. In vitro pharmacokinetic evaluation indicated that the compounds had relatively good drug-likeness properties. Our research suggested that these two compounds have the potential to be further developed as antiviral drugs for COVID-19 treatment.

Objective:To explore the mechanism,clinical features,and prognosis of trigemino-cardiac reflex (TCR) during skull base operations.Methods:A retrospective analysis was performed on 291 patients with skull base disease from Jan.2009 to Oct.2015 in Peking University First Hospital.By reviewing the patients' operative data and anaesthetic electrical record,and we picked out all the patients who suffered from TCR during the operation and analyzed their surgical procedures,clinical features,influence factors,and prognosis.TCR was defined as a drop in mean arterial blood pressure (MABP) and the heart rate (HR) of more than 20％ to the baseline values before the stimulus and coinciding with the manipulation of the trigeminal nerve.Results:In all the 291 patients receiving skull base surgery,9 patients suffering TCR for 19 times during the operation were found.These 9 cases included three acoustice schwannomas,one trigeminal schwannoma,one petroclival meningioma,one epidermoid cyst in cerebellopontine angle,one cavernous sinus cavernous hemangioma,one pituitary adenoma,and one trigeminal neuralgia.The trigger of TCR was related to manipulation,retraction,and stimulation of the trunk or branches of trigeminal nerve.The baseline heart rate was 62-119/min [mean (79.4 ± 14.6) /min] and dropped about 29.0％-66.4％ (mean 44.3％) to 22-60/min [mean (44.2 ±9.6) /min] after TCR.The baseline mean arterial blood pressure was 75-103 mmHg [mean (87.5 ±7.8) mmHg] and dropped about 23.4％-47.2％ (mean 37.3 ％) to 45-67 mmHg [mean (54.9 ± 6.3) mmHg] after TCR.During the 19 times of TCR,heart rate and blood pressure could return to baseline in a short time while stopping manipulation (8 times),using atropine (8 times,dose 0.5-1.0 mg,mean 0.69 mg),using ephedrine hydrochloride (one time,15 mg),using epinephrine (one time,1 mg),and using dopamine (one time,2 mg).TCR also could be triggered again by a second stimulation.There was no relative cardiologic complication or neurological deficit in the postoperative 24 hours.Conclusion:TCR is a short neural reflex with a drop in blood pressure and heart rate coinciding with the manipulation of the trigeminal nerve in skull base surgery.Correct recognition,intensive observation,and essential management of TCR will lead to a good prognosis.

Objective To evaluate the effects of OPRM1All8G and CYP3A4*18B genetic polymorphism and the interaction on postoperative analgesia with fentanyl in the patients undergoing radical resection of lung cancer.Methods One hundred and thirty-nine patients (native of Henan province),aged 40-64 yr,weighing 40-70 kg,of American Society of Anesthesiologists physical status Ⅰ or Ⅱ,scheduled for elective radical resection of lung cancer under general anesthesia,were enrolled in this study.The polymorphic sites of the OPRM1All8G and CYP3A4*18B allele were analyzed by using polymerase chain reaction technique and ABI 3130 Genetic Analyzer.The patients were divided into wild homozygote group (group AA,group *1/*1),heterozygote group (group AG,group * 1/*18B) and mutation homozygote group (group GG,group *18B/*1SB) according to their genotypes.The patients were divided into 7 groups according to the interaction between the two genes:AA plus *1/*1 group (group Ⅰ),AA plus *1/*18B group (group Ⅱ),AG plus *1/*1 group (group Ⅲ),AG plus *1/*18B group (group Ⅳ),GG plus * 1/*1 group (group Ⅴ),GG plus *1/*18B group (group Ⅵ) and *18B/*18B group (group Ⅶ).Patientcontrolled intravenous analgesia with fentanyl was started at the end of surgery to maintain the visual analogue scale ≤ 3 points.The amount of fentanyl used within 24 and 48 h after surgery was recorded,and the occurrence of adverse reactions within 48 h after surgery was observed.Results The amount of fentanyl used within 24 and 48 h after surgery was significantly higher in group GG than in group AA (P＜0.05).The amount of fentanyl used within 48 h after surgery was significantly lower in group *18B/*18B than in group *1/*1 (P＜0.05).The amount of fentanyl used within 48 h after surgery was significantly higher in Ⅱ and Ⅳ groups than in group Ⅰ,in group Ⅲ than in group Ⅱ,in group Ⅴ than in Ⅰ-Ⅳ groups,and in group Ⅵ than in Ⅱ and Ⅳ groups,and was significantly lower in group Ⅶ than in Ⅰ-Ⅵ groups (P＜ 0.05).There was no significant difference in the incidence of adverse reactions within 48 h after surgery between groups (P＞0.05).Conclusion OPRM1A1l8G and CYP3A4*18B genetic polymorphism and the interaction are the genetic factors contributing to individual variation in fentanyl pharmacodynamics in the patients undergoing radical resection of lung cancer.

OBJECTIVETo explore the change of electrocardiographic ischemic J wave in patients with coronary heart disease (CHD) underwent percutaneous coronary intervention (PCI).

METHODSCHD patients (CHD, n = 162) underwent PCI in the hospital were divided into unstable angina pectoris (angina pectoris group, n = 108) and acute myocardial infarction group (AMI group, n = 54), 12-lead electrocardiogram was recorded within 24 hours before and after PCI. Patients were further grouped into left anterior descending artery group and right or circumflex coronary artery stenosis group. The incidence, amplitude and time course of J waves were measured and analyzed.

RESULTS(1) The highest incidence of J wave appeared in II, III, aVF leads pre- and post-PCI in CHD groups (33.95%, 22.84%, 26.54% and 30.86%, 19.75%, 23.46%). Higher incidence of J wave in AMI group was evidenced in V(5), II, aVF, III, V(3) leads before PCI (33.33%, 27.78%, 16.67%, 12.96%, 11.11%) and in V(5), II, aVF, aVL, III leads after PCI (22.22%, 22.22%, 14.81%, 12.96%, 9.26%). (2) Before PCI, higher incidence of J wave was found in V(5), V(6) leads (25.78%) in left anterior descending artery group and in II, III, aVF leads (35.37%) in right or circumflex coronary artery stenosis group. After PCI, the higher incidence of J wave in left anterior descending artery group and right or circumflex coronary artery stenosis group was evidenced in II, III, aVF leads (21.09% and 35.37%, respectively). (3) The ischemic J wave' amplitude and time course in II, III, aVF, V(3), V(4) leads were significantly reduced post PCI in CHD patients.

CONCLUSIONSHigher incidence of J wave was found in II, III, aVF in CHD patients. PCI is associated with reduced amplitude and time course of J wave suggesting PCI could improve ischemic J waves in CHD patients.

Adult ; Aged ; Aged, 80 and over ; Angina, Unstable ; physiopathology ; therapy ; Coronary Disease ; physiopathology ; therapy ; Electrocardiography ; Female ; Humans ; Male ; Middle Aged ; Myocardial Infarction ; physiopathology ; therapy ; Percutaneous Coronary Intervention

OBJECTIVETo investigate the effect of different pressure oxygen pre-breathing in preventing decompression sickness of rats.

METHODSForty male SD rats were randomly divided into 4 groups: decompression sickness (DCS) group and three oxygen pre-breathing groups with 1 ATA, 2 ATA and 3 ATA pressure respectively. The rats of DCS group were placed in the hyperbaric chamber and the chamber was compressed evenly within 3 minutes to depths of 7 absolute atmosphere(ATA) and held at the designated depth for 60 min, then decompressed (3 min) at constant speed to the surface pressure. After that, the rats were taken out for further detection. While the rats of oxygen pretreatment groups pre-breathed different pressure oxygen for 20 min before entering into chamber. The mortality and behavioral of rats were observed with 30 min post decompression. The dry/wet ratio of the lung, protein levels in the bronchoalveolar lavage fluid (BALF), and the inflammatory cytokine tumor necrosis factor (TNF-alpha) expression were also tested.

RESULTSCompared with that of the DCS group, the mortality and morbidity of oxygen pre-breathe groups didn't change obviously. But the total BALF protein level and the inflammatory cytokine TNF-alpha expression of 1 ATA oxygen pre-breathe group were obviously decreased, while the dry/wet ratio of lung as obviously increased instead (P < 0.05).

CONCLUSIONAlthough preoxygenation can' t obviously change the mortality and mobidity of rats, normal pressure oxygen pre-breathing can mitigate the protein infiltration in BALF and the expression of inflammatory cytokine in lung tissue.

Animals ; Bronchoalveolar Lavage Fluid ; chemistry ; Decompression Sickness ; Diving ; Lung ; pathology ; Oxygen ; physiology ; Pressure ; Rats ; Rats, Sprague-Dawley ; Tumor Necrosis Factor-alpha ; metabolism