OBJECTIVE To approach the effect of empirically applying ?-lactam antibiotics for treatment of hospital-acquired pneumonia on distribution and antibiotic-resistance of pathogenic bacteria.METHODS To investigate 141 patients with hospital-acqired pneumonia in intensive care unit during Jan 2001-Oct 2005,and divide into 3 groups:third generation cephalosporin group;lactamase inhibitor group;and other lactam antibiotics group according to different initial antibacterial strategy,then analyze difference in distribution and antibiotic-resistance of pathogens among each group.RESULTS We acquired 164 strains of pathogens.Comparing with other two groups,the proportion of Gram-positive cocci in lactamase inhibitor group was higher significantly(P

Objective To assess the correlation of intima media thickness (IMT) in two dimension ultrasound and hemodynamic parameters of Doppler with arteriosclerosis.Methods Eighteen male New Zealand white rabbits were fed by fat rich feed.At the beginning and the end of 4th week,8th week, 10th week, and 12th week, the parameters of systolic velocity(SV),diastolic velocity(DV),mean velocity(MV),pulsitive index(PI),resistent index(RI) and SV/DV in Doppler as well as maximum IMT and mean IMT in two dimensional ultrasound were obtained in all objects' abdominal aorta and their correlations with arteriosclerosis confirmed by partly animal dissection at the end of 4th week,8th week,10th week and 12th week were compared.Results Of all parameters,SV,SV/DV,PI and RI had significant positive correlation with arteriosclerosis (P 0.05 ).Conclusions Among above hemodynamics parameters of Doppler and morphologic change in two dimensional ultrasound,maximum IMT and mean IMT were found to be best correlative with arteriosclerosis.

Objective To observe the effects of seawater immersion at different temperatures on survival time and mortality and physiological state of non-anesthetized rats.Methods Totally 100 SD male rats(The abdominal cavity was implanted with a temperature sensor in advance)were randomly divided into five groups which were immersed in 20 ℃,17 ℃,15 ℃,13 ℃ and 10 ℃ seawater,respectively.Each group contains 20 rats.The changes of respiration,heart rate and muscle fibrillation within 2 hours were observed and the survival time and mortality of each group were counted in 24 hours.The decrease trend of intraperitoneal temperature in rats was analyzed retrospectively within 2 hours.Results Soaking for 10 minutes,the respiratory and heart rate of each group were significantly increased,but there was no significant difference among groups(P>0.05).The respiratory and heart rate decreased rapidly between 10 and 40 minutes,and the decline was slower relatively between 40 and 80 minutes.Soaking for 80 minutes,the respiration rate of rats among groups had significant difference(P<0.05).Immersing for 100 minutes,the heart rates of rats in each group were significantly different(P<0.05).Soaking for 20 minutes,the muscle fibrillation of 15 ℃,13 ℃ and 10 ℃ group reached the peak,and there were significant differences among groups(P<0.05),then disappeared.However the rats in 20 ℃ and 17 ℃ group reached the peak at 30 minutes,but there was no significant difference between two groups(P>0.05),hereafter the muscle fibrillation was maintained at a certain level.The mean survival time of 20 ℃ group,17 ℃ group,15 ℃ group,13 ℃ group and 10 ℃ group in 24 hours were(23.6±1.23)hours,(15.0±4.16)hours,(7.7±3.21)hours,(2.4±0.91)hours and (1.1±0.39)hours,respectively,and the survival curve of each group was statistically significant(P<0.05).The intraperitoneal temperature of rats showed a decline in the cliff,the lower the water temperature,the faster the descending.Soaking for 40 minutes,the difference of intraperitoneal temperature of each group was statistically significant(P<0.05).Conclusion The effects of seawater immersion at different temperatures on the physiological state and survival time and mortality of rats are significantly different.With the decrease of water temperature,the physiological state changes more obviously,the survival time is shorter and the mortality rate is higher.

Gestational diabetes mellitus (GDM) is the most common metabolic disorder during pregnancy, which seriously affects the normal development of the fetus.Blood glucose control during pregnancy is associated not only with recent adverse outcomes such as preterm birth, macrosomia, hypoglycemia, neonatal respiratory distress syndrome, electrolyte disorders, heart malformations and intestinal disorders, but also with long-term results such as conti-nued impaired glucose tolerance, obesity, metabolic syndrome, mental illness and eye disease.Correct understanding of adverse effects of GDM on newborn infants in the short and long term and their related mechanisms as well as timely prevention and treatment measures can significantly improve the outcome of pregnancy.This paper will make a summary of these problems.