Objective To evaluate the postoperative efficacy and safety of dexmedetomidine for cardiac surgery patients in intensive care unit. Methods A total of 90 cardiac surgery patients in the intensive care unit (ICU)were randomly assigned into dexmedetomidine group(D group,45 cases)and propofol group(P group,45 cases)to receive dexmedetomidine or propofol respectively for post-operative sedation. The ratio of sedation satisfac-tion was evaluated and calculated by Riker sedation-agitation scale(SAS),and the duration of mechanical ventila-tion,24-hour consumption of sufentanil,ICU staying time,and the incidences of side-effects(such as hypoten-sion,bradycardia,delirium etc)were recorded during the observation period. Results No significant differences were found in the ratio of sedation satisfaction and the incidences of bradycardia and delirium between the two groups (P > 0.05). The duration of mechanical ventilation and ICU staying time were significantly shorter in D group than that in P group(P<0.01),while the 24-hour consumption of sufentanil and the incidences of hypoten-sion and delirium were significantly lower than that in P group(P<0.05). Conclusion Using the dexmedetomi-dine as a postoperative sedation drug for post cardiac surgical patients in ICU is clinically effective and safe ,and the postoperative recovery of patients may be enhanced by the drug using.

Objective To investigate the relationships between septic shock and vascular endothelial cells (VECs)injury by measuring the plasma CEC,vWF,and NO in septic shock patients and to explore its potential clinical values. Methods 72 patients were divided into group A including 34 infection patients but without septic shock,and group B including 38 patients with septic shock. Circulating endothelial cell(CEC),von willebrand factor(vWF),and nitric oxide(NO)in plasma were measured in all patients at the time points of accessing ICU (T0)and 24 hours after staying in ICU(T1). And the blood pressures of studied patients were also recorded at the same time points. Results The levels of CEC and vWF at each observing time point were higher in group B than those in group A(P < 0.01),while the levels of NO were lower in group B than those in group A(P < 0.01). In group B,the levels of CEC and vWF at T1 were higher than those at T0(P<0.01),while the level of NO was low-er at T1 than that at T0(P<0.01). With contrary to those of group A,circulation conditions of group B were obvi-ously unstable and high doses of vasoactive agents were needed during the therapy period. MAP in group B at each time point was obviously lower than that in group A(P<0.05). There were 7 dead cases(18%)in group B but no death in group A during the whole therapy period. Conclusion Obvious injury of vascular endothelial cells exists in septic shock patients and the injury degree is related to the severity of the disease.

Objective To determine the median effective concentration (EC50) of amitriptyline for intravenous regional anesthesia (IVRA) in rats.Methods Ninety healthy male SD rata weighing 190-240 g were randomly divided into 3 groups (n=30 each) : amitripryline group,bupivncaine group and lidocaine group.The rat's tail was divided into 3 epual parts: the proximal,middle and distal part.A 24 gauge needle was inserted into vena caudalis in the distal part.Esmarch bandage was applied around the tail from distal to proximal to expel blood from the taft and was removed after a tourniquet was applied between the proximal and middle part of the tail to occlude artery.0.5 ml of amitriptyline,bupivncaine or lidocaine was injected into the taft vein immediately after the application of the tourniquet.Ten minutes after drug administration the tourniquet was released.The ECho was determined by the up-and-down sequence method.The initial concentration of amitriptyline was 0.05%,the consecutive concentration-ratio was 1.4i4; the initial concentration of bupivacaine was 0.03%,the consecutive concoatration-ratio was 1.667 and the initial concentration of lidncaine was 0.08%,the consecutive concentrationratio was 1.250.EC50 and 95% confidence interval were calculated.Tail-flick latency (TFL) was assessed at 1 h before (baseline) and at 3 min and 2 d after drug administration.Central nervous system toxicity (seizure,convulsion,death) and local tissue damage to the tail were also recorded.Results The EC50 for IVRA was 0.111% (95% CI,0.092%-0.133%) in amitripthline group; 0.058% (95% CI,0.048%-0.078%) in bupivacaine group and 0.129% (95% CI,0.103%-0.160%) in lidocaine group respectively.The EC50 was significantly lower in bupivacaine group than in amitriptyline and lidocaine group.There was no significant difference in EC50 between amitriptyline and lidocaine group.The TFL measured at the proximal part of the tail was not significantly different between different time points in each group.The TFL measured at the middle part at 3 rain after drug adminisuation was significantly increased as compared with the baseline in all 3 groups but was not significantly different between the baseline and that measured at 2 d after drug administration.No CNS toxicity and local tissue damage were found during the experiment in all 3 groups.Conclusion Amitriptyline can produce intravenous regional anesthesia.The potency of amitriptyline is significantly lower than that of bupivncaine but is not significantly different from that of lidocaine.

Objective To study the effect on renal function about repeated use of contrast media , and whether alprostadil has protective effect towards contrast-induced nephropathy ( CIN) .Methods 80 adult patients who had ever received contrast examination and scheduled to have PCI within 1 month were randomly divided into two groups: the simple hydration group and the hydration plus alprostadil therapy group.The serum level of creati-nine,urea, Cystatin C, Urineβ-microglobulin and creatinine clearance were recorded and compared between the two groups , and were observed before and after repeated exposure of contrast medium.The incidence of CIN was analyzed .Results Compared with pre-contrast levels , serum levels of urea, creatinin, Cystatin C and Urine β-microglobulin all elevated after single and repeated contrast media use in patients in the simple hydration group ( P<0.05 ) .The incidence of CIN did not differ after single or repeated contrast used (2.5%vs.15.0%, P>0.05).After repeated contrast exposure compared with patients with simple hydration , patients in the alprostadil group had repeated serum levels of urea [(7.4 ±2.3) mmol/L vs.(9.1 ±2.6) mmol/L], creatinia [(87.2 ±25.6) μmol/L vs.(96.9 ± 25.8) μmol/L], Cystatin C [(0.8 ±0.3) mg/L vs.(1.4 ±0.3) mg/L] and Urine β-microglobulin [(207.0 ±31.9 ) μg/L vs.(279.3 ±37.3 ) μg/L] were all lower with higher creatinin clearance [(92.2 ±24.2) ml/min vs.(78.2 ±27.5) ml/min](all P<0.05).The incidence of CIN in patients with alprostadil did not differ after single or repeated contrast used (2.5%vs.7.5%, P>0.05).The incidence of CIN in patients treated with alprostadil had no difference compared with patients with simple hydration after repeated contract (7.5% vs.15.0%, χ2 =0.501,P=0.479).Conclusions Contrast media can cause damage to renal function .Short-term repeated use of contrast media can further worsen renal function without significant increase in CIN rates .Alprostadil may have renoprotective effect towards CIN .

Objective:This study aimed to systematically evaluate the efficacy and safety of ivabradine in patients with dilated cardiomyopathy, and to provide evidence-based reference for clinical treatment.Methods:We searched PubMed, Embase, Cochrane Library, Web of Science, CNKI, Wan Fang, VIP databases from inception to 1 September 2021 for randomized controlled trials (RCTs) that compared conventional therapies and ivabradine with conventional therapies in dilated cardiomyopathy patients. Studies meeting the inclusion criteria were included and analyzed. After data extraction and literature quality evaluation, we use the Review Manager 5.4 to perform the meta-analysis and publication bias test.Results:5 studies enrolling 494 patients were included. Compared with conventional therapies (control group), ivabradine and conventional therapies (observation group) significantly reduced resting heart rate [ MD=-7.58, 95% CI(-12.40, -2.76), Z=3.08, P=0.002], left ventricular end diastolic diameter (LVEDD) [ MD=-4.48, 95% CI(-7.33, -1.64), Z=3.09, P=0.002], left ventricular end systolic diameter (LVESD) [ MD=-4.94, 95% CI(-7.29, -2.59), Z=4.12, P<0.001], B-type natriuretic peptide (BNP) [ MD=-212.39, 95% CI(-230.55, -194.23), Z=22.92, P<0.001], New York Heart Association (NYHA) class [ MD=-0.36, 95% CI(-0.44, -0.27), Z=8.46, P<0.001] and Minnesota Questionnaire Score [ MD=-10.43, 95% CI(-15.72, -5.13), Z=3.86, P=0.001]. The left ventricular ejection fraction (LVEF) levels [ MD=1.31, 95% CI(0.64, 1.97), Z=3.85, P=0.001], 6-minute walk test level (6MWT) [ MD=54.83, 95% CI(40.58, 69.08), Z=7.54, P<0.001], systolic blood pressure [ MD=4.72, 95% CI(0.91, 8.54), Z=2.43, P=0.02], the incidence of visual symptoms (phosphene) [ OR=7.22, 95% CI(1.32, 45.00), P=0.02] and symptomatic bradycardia [ OR=8.90, 95% CI(1.21, 65.75), P=0.03] in the observation group were higher than those in the control group after treatment. In addition, there were no significant difference in the incidence of acute event between the two groups [ OR=0.72, 95% CI(0.12, 4.29), P=0.72]. Conclusions:Meta analysis showed that ivabradine combined β receptor blockers can effectively reduce resting heart rate and improve cardiac function in patients with dilated cardiomyopathy, but may increase the incidence of hallucinations and symptomatic bradycardia.

Objective:To establish the acute symptomatic osteoporotic thoracolumbar fracture (ASOTLF) classification system, and to examine the reliability and evaluate the effect of clinical application.Methods:A retrospective case series study was conducted to analyze the clinical data of 1 293 patients with osteoporotic thoracolumbar fracture(OTLF) admitted to Honghui Hospital from January 2016 to December 2018. There were 514 males and 779 females, aged 57-90 years [(71.4±6.3)years]. The T value of bone mass density was -5.0--2.5 SD [(-3.1±-0.4)SD]. According to the clinical symptoms a and fracture morphology, OTLF was divided into 4 types, namely type I(I occult fracture), type II(compressed fracture), type III (burst fracture) and type IV(unstable fracture). The type II was subdivided into three subtypes (type IIA, IIB, IIC), and the Type III into two subtypes (type IIIA, IIIB). of all patients, 75 patients (5.8%) were with type I, 500 (38.7%) with type II A, 134 (10.4%) with type IIB, 97 (7.5%) with type IIC, 442 (34.2%) with type IIIA, 27(2.1%) with type IIIB and 18 (1.4%) with type IV. After testing the validity of the classification, different treatment methods were utilized according to the classification, including percutaneous vertebroplasty (PVP) for Type I, PVP after postural reduction for Type II, percutaneous kyphoplasty (PKP) for Type IIIA, posterior reduction and decompression, bone graft fusion and bone cement-augmented screw fixation for Type IIIB, and posterior reduction, bone graft fusion and bone cement-augmented screw fixation for Type IV. The visual analog score (VAS), Oswestry disability index (ODI), Frankel grade of spinal cord injury, local Cobb Angle, and vertebral body angle (vertebral body angle) were recorded in all patients and in each type of patients before surgery, at 1 month after surgery and at the last follow-up. The neurological function recovery and complications were also recorded.Results:The patients were followed up for 24-43 months [(29.9±5.1)months]. A total of 3 000 assessments in two rounds were conducted by three observers. The overall κ value of inter-observer credibility was 0.83, and the overall κ value of intra-observer credibility was 0.88. The VAS and ODI of all patients were (5.8±0.7)points and 72.5±6.6 before surgery, (1.8±0.6)points and 25.0±6.3 at 1 month after surgery, and (1.5±0.6)points and 19.5±6.2 at the last follow-up, respectively (all P<0.05). The Cobb angle and vertebral body angle of all patients were (13.0±9.1)° and (8.0±4.6)° before surgery, (7.9±5.2)° and (4.6±2.9)° at 1 month after surgery, and (9.1±6.0)° and (5.8±3.0)° at the last follow-up, respectively (all P<0.05). At the last follow-up, VAS, ODI, Cobb Angle and VBA of each type of patients were significantly improved compared with those before surgery (all P<0.05). The spinal cord compression symptoms were found 1 patient with type IV and 5 patients with type IIIB preoperatively. At the last follow-up, neurological function improved from grade C to grade E in 1 patient and from grade D to grade E in 5 patients ( P<0.05). The lower limb radiation pain or numbness in 3 patients with type IV and 22 patients with type III preoperatively were fully recovered after surgical treatment at the last follow-up except for three patients. Conclusions:The ASOTLF classification is established and has high consistency and reliability. The classification-oriented treatment strategy has achieved a relatively satisfactory effect, indicating that the classification has a certain guiding significance for treatment of OTLF.