Objective To study the effect of dexmedetomidine anesthesia on surgery condition, renin-angiotensin-aldosterone system (RAAS) activity and renal function of laparotomy patients.Methods 96 patients received laparotomy in our hospital during May 2012 to October 2015 were studied, which were divided into dexmedetomidine group (D group) and control group (C Group) by random number table method and received different anesthetic regimes.Then surgery condition, renal function indexes and plasma renin, angiotensin II levels of two groups were compared.Results The operation time, intraoperative blood loss, intraoperative transfusion volume and awakening time of D group and C group had no significant difference.10 min after opening abdomen and 10 min before closing abdomen, the plasma renin, angiotensin II, cystatin C (Cys-C),α1-microglobulin (α1-MG) contents were significantly lower than those of C group(P<0.05).Conclusion Dexmedetomidine anesthesia applicated in laparotomy could inhibit the RAAS activity, protect renal function, and its anesthesia effect is more precise.

Aim Tostudytheeffectof4-phenlybuty-rate acid(4-PBA) on the heart function of diabetic rats and to explore its underlying mechanism. Methods MaleSprague-Dawley(SD)ratsweredividedintothree groups randomly: ( 1 ) control rats;( 2 ) diabetic rats;(3) 4-PBA treated diabetic rats. Type 1 diabetic mod-el was induced by single intraperitoneal injection of strepotozotocin (60 mg·kg-1 ) . After five weeks dia-betic model was established, diabetic rats were treated with 4-PBA by P. O at the dose of 1 g·kg-1 per day for 20 weeks. At the end of the experiment, hemody-namics of the left ventricle and main artery were detec-ted through right carotid artery cannulation in rats. The level of blood glucose, the activity of superoxide dis-mutase( SOD) and nitric oxide synthetase ( NOS) and the content of malondialdehyde ( MDA ) and nitric ox-ide( NO) of serum and myocardial tissue in rats were measuredbycolorimetry.Results Thetreatmentof4-PBA had no effect on blood glucose, the weight of body and heart, but slightly increased systolic and diastolic pressure of artery, heart rate, systolic pressure of left ventricular, maximum increase rate and minimum de-crease rate of left ventricular pressure( ± dp/dt) in di-abetic rats. It also slightly decreased diastolic pressure of left ventricular, shortened diastolic duration of left ventricular ( P > 0. 05 ) . Moreover, it significantly shortened relaxation time of left ventricular in diabetic rats (P<0. 05). In addition, the treatment of 4-PBA obviously enhanced the activity of SOD and NOS, NO content, and reduced the content of MDA in serum and heartofdiabeticrats(P<0.05).Conclusion 4-PBA has a potential protective effect on heart function in diabetic rats, which is achieved by ameliorating he-modynamics and significantly improving diastolic dys-function in diabetic rats. The underlying mechanism may be related to the inhibition of oxidative stress and promoting the genesis of NO in myocardial tissue.

Objective To compare the effect of sevoflurane and propofol in elderly surgery patients towards cardiac damage.Methods 45 elderly patients with hypertension were divided into Sevoflurane group and Propofol group,which were observed changes of their ECG ST-segment,Mb,CK-MB,cTnI.Results 24 hours after induction of anesthesia,cardiac damage could be observed;Compared with Sevoflurane group,levels of CK-MB,Mb and cTnI increased significantly 24 hours after induction of anesthesia(t =2.771,0.681,0.557,all P ＜ 0.05),ST-segment significantly depressed at the same time[(-1.96±0.06)mV,(-1.45±0.04)mV](P ＜0.05).Conclusion Elderly patients with hypertension show cardiac damage during pevi-operative stage;Compared with propofol,sevoflurane shows lighter damage to cardiac muscle.

0.0125) incision of trachea,and oral and pharyngeal portion,but no correlation with hands of nurse and external environment(P

Objective To investigate the effects of cold exposure with different time courses on cardiovascular function and skeletal muscle contraction in Sprague-Dawley (SD) rats.Methods The male SD rats were randomly divided into control,12-h cold,24-h cold,and 48-h cold groups.The rats in all cold group were maintained in 4 ℃ environment for indicated time and allowed free access to standard rat chow and water ad libitum.After the animal model was established,the heart,thoracic aorta,soleus,and extensor digitorum longus (EDL) were rapidly isolated from rats under anesthesia and then fixed into the respective organ perfusion system that was connected to physiological recorders and data acquisition system.Lanendorff heart persusion was used to detect some parameters of cardiac function,such as coronary flow (CF),mean left ventricular systolic pressure (mLVSP),mean left ventricular diastolic pressure (mLVDP) and maximum ascending and declining rate of left ventricular pressure (± dp/dt max) ; and then the heart was suffered from 30 min ischemia followed by 60 min reperfusion,the changes of above cardiac function indexes were recorded again.Organ bath method was employed to detect contraction response to potassium chloride (KCl) or phenylephrine (PE) and endothelium-dependent relation responses to acetylcholine (ACh) of aortic rings.The twitch tension,titanic tension,and fatigue test of soleus and EDL were examined by electrical stimulation to reflect contractive function of skeletal muscle.Results The coronary flow (CF) were significantly reduced in 24-h and 48-h cold groups compared to control group [(9.0 ± 1.7) ml/g and (9.8 ± 1.3) ml/g vs (11.6 ± 1.2) ml/g,P ＜ 0.05] ; 48-h cold exposure also showed significantly increased mLVSP (P ＜0.01) and mLVP (P ＜ 0.05) of rats.After ischemia-reperfusion,the heart re-beat time was shorter in all cold exposure groups (all P ＜ 0.01),mLVP and mLVDP were higher in 24-h and 48-h cold group than control group (all P ＜ 0.01).The contraction of aortic rings responses to 60 mmol/L KCl [(0.63 ±0.13) g and (0.79 ±0.11)g vs (1.28±0.17)g,P ＜0.01] and 1 μmol/L PE [(0.62 ±0.18)g and (0.68 ±0.13)g vs (1.25 ± 0.18)g,P ＜ 0.01] were decreased while the endothelium-dependent relaxation responses to low concentration ACh (3 × 10-8 ～ 3 × 10-7) were increased in 24-h and 48-h cold groups relative to control group (all P ＜ 0.05).The 48-h cold also reduced titanic tension of SOL and EDL in comparison with control [(4.14 ± 0.62) N/cm2 vs (5.50 ± 0.75) N/cm2,P ＜ 0.05 and (3.00 ± 0.57) N/ cm2 vs (4.70 ± 0.85) N/cm2,P ＜ 0.01].Conclusions 24 ～ 48 h cold exposure could reduce CF but enhance the tolerance of heart from rats to ischemia reperfusion injury and also decrease the contraction of aortic rings response to KCl or PE but increase the sensitive responses to ACh of aortic rings from rats.The 48-h cold could decrease the contraction of skeletal muscle elicited by electrical stimulation.

Objective To investigate the effects of fasting with different time courses on the contraction of skeletal muscle and cardiovascular function in Sprague-Dawley (SD) rats.Methods The healthy and male SD rats were randomly divided into (1) control,(2) 12 h fasting,(3) 24 h fasting,and (4) 48 h fasting groups.After animal models of fasting with different time courses were established,the heart,thoracic aorta,soleus,and extensor digitorum longus (EDL) were rapidly isolated from rats under anesthesia and then fixed into the respective organ perfusion system that was connected to physiological recorders and data acquisition system.Langendorff heart perfusion was used to detect some parameters of cardiac function,including left ventricular systolic pressure (LVSP),left ventricular end-diastolic pressure (LVEDP),and maximum ascending and declining rate of left ventricular pressure (± dP/dt max).Then,the heart was suffered from 30 min ischemia followed by 60 min reperfusion,the changes in above cardiac function parameters were recorded again.The contraction response to potassium chloride or phenylephrine and endothelium-dependent relation responses to acetylcholine (ACh) of aortic rings were measured with organ bath.The changes of twitch tension and titanic tension of soleus and EDL were examined to reflect contractive function of skeletal muscle.Results The + dP/dt max was significantly reduced in 24 h and 48 h fasting groups compared to the control (P ＜ 0.01).After ischemia-reperfusion,the heart re-beat time was significantly longer [(24.3 ± 7.0)min vs (14.0 ± 2.9)min,P ＜0.05],both mLVDP and mLVP were significantly higher in 48 h and 24 h fasting groups than control group (P ＜ 0.05),and those changes did not normalized until re-perfusion 60 min.The 48 h fasting increased significantly endothelium-dependent relaxation of aortic rings response to low concentration acetylcholine (P ＜ 0.05),but did not affect the maximum relaxation of aortic rings response to high concentration acetylcholine and contraction of aortic rings responses to potassium chloride and phenylephrine.The 48 h fasting also enhanced significantly titanic tension of soleus compared to the control [(7.01 ± 1.22) N/cm2 vs (5.5 ± 0.75) N/cm2 for48 h-Fasting vs Control,P ＜0.05].Conclusions The 24 ～48 h fasting may induce inhibition of cardiac function,while fasting 48 h can increase the sensitivity of aortic rings responses to ACh and contraction function of soleus in healthy and male rats.

Aim This study was aimed to explore the influence and mechanism of the long-term exercise on skeletal muscle contraction and mitochondrial biosyn-thesis in different muscle fibers.Methods Soleus (SOL)and extensor digitorum longus (EDL)were i-solated from SD male rats with platform running train-ing for eight weeks.The changes of contractility under different electrical stimulation were observed, mito-chondrial biosynthesis,including ATP content,mito-chondrial DNA,the gene expression of PGC-1αand NRF were also detected.Results Long-term endur-ance exercise can improve twitch tension and titanic tension of SOL and EDL ,but only enhanced the fa-tigue resistance in SOL.ATP contents were significant-ly increased in the two types of muscles,but mtDNA content,PGC-1αexpression and NRF translation were only obviously enhanced in SOL,in accompanied with an increase in p-AMPK/AMPK protein ratio.Conclu-sion Long-term endurance exercise increased skeletal muscle contractility and improved the anti-fatigue abili-ty in SOL,which may be associated with increase in mitochondrial biosynthesis via activated AMPK-PGC-1αaxis.

Objective To investigate the effects of calorie restriction (CR) for 4 weeks on twitch tension,titanic tension,and fatigue contraction induced by electrical stimulation in different kind skeletal muscles from rats and explore the possible mechanisms.Methods The rat model of CR was established by a limitation of 40％ calorie intake of control rats for 4 weeks,and then oral glucose tolerance test (OGTT) was performed.The soleus (SOL) and extensor digitorum longus (EDL) were isolated under anesthetization to detect twitch tension,titanic tension,and fatigue contraction induced by electrical stimulation.Adenosine triphosphate (ATP) content was measured by fluorescent enzymatic methods to reflect mitochondrial function.The ratio of mitochondrial gene COX Ⅰ and nuclear gene β-actin copy number was analyzed to evaluate mitochondrial biogenesis.Furthermore,the transcriptions of peroxisome proliferatoractivated receptor γ coactivator-1 (PGC-1α) and nuclear respiratory factor 1 (NRF1) genes,expressions of phosphorylated adenosine 5'-monophosphate-activated protein kinase (AMPK) and nitric oxide synthase (NOS) proteins,and nitric oxide (NO) content were determined in skeletal muscle.Results The blood glucose level at 30 min and area under the curve of blood glucose levels at various time points during OGTT were significantly decreased in the CR group compared to the control group.The twitch tension [(2.5 ± 0.15)N/cm2 vs (1.24±0.12)N/cm2,(2.66 ±0.21)N/cm2 vs (1.69 ±0.17)N/cm2,P ＜ 0.05],titanic tension [(10.43 ± 0.36) N/cm2 vs (8.06 ± 0.19) N/cm2,(11.35 ± 1.02) N/cm2 vs (8.12 ± 0.23) N/cm2,P ＜ 0.05],and fatigue contraction force in SOL and EDL from CR rats were significantly increased in association with increases of ATP content [(34.82 ±4.31)) mnol/mg protein vs (15.32 ± 1.94) nmol/mg protein,(30.82 ± 2.15) nmol/mg protein vs (12.32 ± 0.97) nmol/mg protein,P ＜ 0.05] and mitochondrial biogenesis (2.75 ± 0.20 vs 1.52 ± 0.06,1.32 ± 0.10 vs 0.84 ± 0.11,P ＜ 0.05) compared to control rats.CR for 4 weeks upregulated the transcriptions of PGC-1α and NRF genes as well as the phosphorylation of AMPK protein in SOL but not in EDL.Furthermore,CR also enhanced NOS expression and NO content in both skeletal muscles.Conclusions CR for 4 weeks can strengthen the contractile function of SOL and DL from rats,and the underlying mechanisms might be related to the upregulation of PGC-1α transcription and AMPK activation,resulting in the enhances of mitochondrial biogenesis and mitochondrial function in skeletal muscles.

Objective To study the Mycoplasma pneumoniae infection in the clinical characteristics and treatment methods. Methods From June 2008 to December 2009,49 cases of Mycoplasma pneumoniae infection in patients with clinical data were retrospectively analyzed and summarized. Results 49 cases of children were diagnosed with acute upper respiratory tract infection in 13 cases(26.5% ) ,acute bronchitis 21 cases(42.9%) ,bronchial pneumonia, 15 cases( 30.6% ). Azithromycin alone treatment group,24 cases cured 22 cases ,2 cases improved, the cure rate of 91.7% ;erythromycin and azithromycin infusion + oral sequential treatment group,25 cases recovered,21cases improved,4 cases,the cure rate was 84%. Compared with the two groups,difference was not statistically significant(P ＞ 0.05). All patients were treated in our hospital with average of 13.8d,follow-up period without recurrence.Conclusion Mycoplasma pneumoniae infection in large differences in clinical manifestations, early diagnosis and treatment should be carried out. Azithromycin in the treatment effect was good, a short course of treatment could be used as treatment of Mycoplasma pneumoniae infection.

Objective To investigate the clinical features of infantile diarrhea with intussusception,improve the level of diagnosis and treatment,reduce the misdiagnosis and delayed treatment.Methods The clinical data of 23 cases with infantile intussusception were retrospectively analyzed.Results Twenty-three cases of children with diarrhea symptoms at the beginning of the disease had different degree,12 cases characterized by vomiting,diarrhea,fever and other symptoms of acute gastroenteritis,5 cases stool were mucous pus blood,6 cases for blood in the stool.Five cases were confirmed within 24 h of the diagnosis (3 cases with air enema reduction of intussusception,2 cases with manual reduction),11 cases were confirmed at 24 h to 3 d of the diagnosis and operated,7 cases were confirmed more than 3 d of the diagnosis and operated.Except 1 cases was died from shock,22 cases were cured.Conclusion Infantile intussusception atypical symptoms,illness development is rapid,in critical condition,easy misdiagnosis,missed diagnosis,should actively improve the standard of diagnosis.,early diagnosis,so as not to delay treatment.