Using the glass microelectrode technique and the inverted microscope, we have successfully recorded the transmembrane potentials in the clusters of cultured cardiac cells from theventricle of newborn rats. The amplitude of action potentials could reach 83.8?15.1 mV (?SD). This method is charaterized by less influence factors of internal environment, high susceptibility, etc. It might be widely applied to the cardiovascular research in physiology, pathophsiology and pharmacology,

Objective To examine the association of characteristics of patients visiting fever clinic with different air quality index in Beijing.Methods Six days with highest ambient air quality index (AQI) (polluted weather group) and 6 days with lowest AQI (clear weather group) during February 1 st to March 31th 2014 were selected as study period.The clinical data of patients,who visited in fever clinic of Peking University Third Hospital during the selected 12 days,were retrospectively analyzed.Results There were 417 patients in clean weather group and 481 in polluted weather group.There were no significant differences in duration of fever [(2.30 ± 2.51) d vs.(2.18 ± 2.58) d,x2 =0.701,P =0.484] and highest body temperature [(38.60 ± 0.65) ℃ vs.(38.57 ± 0.66) ℃,x2 =0.545,P =0.586] between two groups.The symptoms of cough,sore throat in pollution group were higher than those in clear group (52.39％ vs.45.56％,x2 =4.166,P =0.041;50.52％ vs.42.21％,x2 =6.203,P =0.013,respectively).The proportion of cases diagnosed as influenza-like illness in polluted weather was higher than that in clear weather group (53.85％ vs.46.76％,x2 =4.484,P =0.034).Conclusion The results indicate that the symptoms cough and sore throat and influenza-like illness are increased in polluted weather in Beiiing.

The effects of Na_2MoO_4 on experimental ventricular arrhythmias and isolated guinea pig atria are reported. Iv Na_2MoO_4, 8 mg/kg was found to increase the tolerant dose of ouabain to produce ventricular permature beats, ventricular tachycardia and ventricular fibrillation in guinea pigs. Na_2MoO_4 significantly counteracted the ventricular arrhythmias induced by BaCl_2 and aconitine in rats. Na_2MoO_4 10 ?g/10 g ip decreased the incidence of ventricular fibrillation by chloroform in mice, Na_2MoO_4 10 mg/kg did not produce antagonistic effect on the arrhythmias induced by chloroform-adrenaline in rabbits. Na_2MoO_4 0.1 mmol/L inhibited contractility of isolated guinea pig atria, prolonged the functional refractory period and makedly inhibited the frequency-dependent positive staircase phenomenon and the post-rest potentiation.

In this paper, we studied the effect of total flavones of Hippophae rhamnoides L (TFH) on beating and transmembrane potential of cultured sucking rat cardiac cell. The results indicated that cellular beating rate and beating amplitude were significantly reduced, the action potential duration of 50% and 90% repolarization was sbortened, the slope of phase 4 depolarization was decreased, and other parameters of the action potential showed no significant change. In addition, we also observed that TFH could make the spontaneous abnormal beating of cell change into regular beating. These findings suggested that the mechanism of TFH on cultured cardiac cell might have some relation to antagonizing inward flow of Ca~(2+) and aocelerating the move of k' outward.

The antiarrhythmic actions of ZnSO4 (Zinc) were studied in ex-perimental arrhythmias models. ZnSO4 10mg/kg(iv) significantly coun-teracted the arrhythmias, induced by aconitine or BaCl2 rats.It was shown to shorten the duration of arrhythmias induced by chloroform-epinephrine in rabbits. In mice, ZnSO4 20 ?g/10g(ip) decreased the incidence of ventricular fibrillationbychloroform. However, ZnSO4 did not decrease the incidence of CaCl2-induced , venticular fibrillation, the threshold and lethal doseofouabain in producing ventricular permature beats, ventricular fibrillation in guinea pigs.

Zinc sulfate 0.1mmol/L inhibited the frequency dependent positive staircase phenomenon on isolated guinea pig atria. Ten min after adding zinc sulfate 0.1 mmol/L, the contractility of the left atrium decreased. The needed concentration of epinephrine inducing automaticity was increased and the functional refractory period(FRP) was prolonged from 192?5 ms to 247?4 ms ( P

Objective To discuss the teaching of neurobiology to improve the teaching quality. Methods 35 students in Grade 2010, 39 in Grade 2011 and 41 in Grade 2012 in our university were enrolled. Grade 2010 received traditional teaching only, Grade 2011 received problem-based learning (PBL) in addition, and Grade 2012 received traditional teaching, PBL and case discussion. The scores of final exami-nation were compared. Results The scores of final examination were higher in students in Grade 2012 than in Grades 2010 and 2011. Con-clusion The combination of traditional teaching, PBL and case discussion may further improve the teaching quality of students.

Objective To investigate the effects of carbon monoxide poisoning on the long-term cognition in elderly patients.Methods Totally 53 patients with carbon monoxide poisoning and 51 healthy persons at our Hospital from June 2005 to June 2008 were enrolled.Mini-mental state examination(MMSE) and activities of daily living(ADL) scale were utilized to evaluale the life quality of the elderly patients through a cross-sectional study on July 2011.Results MMSE score showed that the attention calculation score,delayed recall score,and total score were higher in control group (4.9±0.4,2.9±1.0,28.3±2.3,respectively) than in carbon monoxide poisoning group (4.5±0.8,2.6±0.6,25.5±3.5,respectively) (t＝3.138,3.607,4.802,all P＜0.05).ADL score of carbon monoxide poisoning group was 26.7±7.3,and that of the control group was 2.04±7.6 (t＝1.827,P＞0.05).Conclusions Elderly patients with acute carbon monoxide poisoning may cause long-term cognitive impairment with decreasing attention calculation and delayed recall.