BACKGROUND:Volar locking plate is the dominant treatment of distal radial fractures, but it is difficult to judge the distance between the plate position and the carpal articular surface, thus leading to screw penetration of the articular surface. Arthroscopy or operative perspective has their pros and cons, there is no simple and effective method of positioning the plate.
OBJECTIVE:To find the optimal position of Volar LCP in distal radius fractures and explore the role of computer simulation in this treatment.
METHODS:The CT data of the wrists in 20 adult patients were col ected to calculate 3D models of the radius by MIMICS software. 3D model of the LCP was calculated by UG in working station. The distance between the plate and the distal radius joint was measured by computer simulation, and the mean value was calculated. A total of 33 Patients with distal radial fractures were divided into two groups:conventional treatment group (regular X-ray and CT) and computer simulation group (preoperative plan based on the computer-measured data).
RESULTS AND CONCLUSION:The safe distance between the screw center and the articular facet was 11.13 mm in males and 10.97 in females. The number of radiation and operating time were shortened significantly in computer simulation group (P<0.05). Experimental findings indicate that, computer simulation is a powerful tool to find the optimal position of volar LCP in the distal radius fractures. The time of the operation and X-ray fluoroscopy are also shortened significantly.

Objective To compare the short-term and long-term therapeutic effects of oral rehydration salts,metoprolol or midodrine hydrochloride in children with postural tachycardia syndrome (POTS).Methods Two hundred and forty-four children with POTS diagnosed in the First Hospital Peking University of from Dec.2004 to Jan.2013 were followed up in clinics or by telephone.They were divided into oral rehydration salt group (n =75),metoprolol group (n =66) and midodrine hydrochloride group (n =103).The patients were followed up for 3 ～ 100 months.Results After 3 months of treatment,the symptom scoring of the three groups was improved greatly as compared with the baseline data.Therapeutic effect of midodrine hydrochloride group was significantly superior to metoprolol group and oral rehydration salt group (x2 =8.750,P =0.013).One hundred and forty-two out of 244 children were followed up and their head-up tilt test(HUT)was repeated.The HR increment of children in 3 groups became smaller as compared with before treatment (P ＜ 0.05).After follow-up,the symptom scoring was improved greatly as compared with the baseline scoring (P ＜ 0.05).The short-term effect of midodrine hydrochloride group was significantly better than that of metoprolol group or oral rehydration salt group (x2 =8.750,P =0.013).The Kaplan-Meier curves showed that the long-term effect of midodrine hydrochloride group was significantly superior to metoprolol group and oral rehydration salt group (89.3％vs 78.8％,P =0.033;89.3％ vs 76.0％,P =0.002).Conclusion Oral rehydration salts,midodrine hydrochloride or metoprolol were all effective for POTS in children.And the short-term and long-term effect of midodrine hydrochloride might be superior to metoprolol and oral rehydration salts.

Objective To analyze the spectrum of underlying diseases in children with transient loss of consciousness (TLOC) through a multi-center and large sample clinical research.Methods Nine hundred and thirty-seven children with TLOC who came from Beijing,Hunan province,Hubei province and Shanghai of China from Aug 1999 to Apr 2011 were recruited in the present study,and then the spectrum of underlying diseases in children with TLOC was analyzed.Results In 937 children with TLOC,903 cases (96.4％ )were children with syncope,34 cases (3.6％) were non-syncope.And in 903 children with syncope,213 cases (23.6％) had vasovagal syncope (VVS) with vasoinhibitory response,46 cases (5.1％ ) had VVS with cardioinhibitory response,112 cases ( 12.4％ ) had VVS with mixed response,268 cases (29.7％ ) had postural tachycardia syndrome,22 cases (2.4％) had orthostatic hypotension,19 cases (2.1％ ) had situational syncope,21 cases (2.3％ ) had cardiogenic syncope,and 202 cases (22.4％ ) had unexplained syncope.Conclusion In children with TLOC,syncope was the most common underlying disease.And in children with syncope,the most common was VVS,followed by postural tachycardia syndrome.In three different hemodynamic patterns of VVS,the most common pattern was VVS vasoinhibitory pattern.

ObjectiveTo observe the effect of Dahuang Xiezhuo prescription on the changes in renal pathology and reactive oxygen species （ROS）/thioredoxin-interacting protein （TXNIP）/NOD-like receptor protein 3 （NLRP3） pathway expression in the kidney tissues of rats with 5/6 nephrectomy， and to explore the mechanism of Dahuang Xiezhuo prescription in protecting renal function and delaying renal interstitial fibrosis and the possibility. MethodNinety healthy male SD rats were randomly divided into a sham operation group， a model group， low， medium， and high-dose （6.825， 13.65， 27.30 g·kg^-1） Dahuang Xiezhuo prescription groups， and a Niaoduqing granule group （2.60 g·kg^-1）. Except the sham operation group， 5/6 nephrectomy was used to replicate the rat model of chronic renal failure （CRF）. After modeling， each administration group was given the corresponding dose of drug suspension by intragastric administration， once a day for consecutive 8 weeks. After administration， serum creatinine （SCr） and urea nitrogen （BUN） levels and 24 h urinary protein quantification （UTP） levels were detected. Western blot assay was used to detect the protein expressions of thioredoxin （TRX）， TXNIP， and NLRP3. The protein expressions of TRX， TXNIP， NLRP3， apoptosis-associated speck-like protein containing a CARD （ASC）， transformation growth factor-β （TGF-β）， Collagen Ⅳ， α-smooth muscle actin （α-SMA）， and fibronectin （FN） were detected by immunohistochemistry. ResultAs compared with the sham operation group， serum levels of SCr， BUN， and UTP in the model group were increased （P<0.05）， TRX， TXNIP， NLRP3， ASC， TGF-β， Collagen Ⅳ， α-SMA， and FN proteins were increased （P<0.01）， and renal interstitial fibrosis significantly occurred. As compared with the model group， the levels of SCr， 24 h BUN， and UTP in the low， medium， and high-dose Dahuang Xiezhuo prescription groups and the Niaoduqing granule group were decreased to varying degrees （P<0.05）， TRX， TXNIP， NLRP3， ASC， TGF-β， Collagen Ⅳ， α-SMA， and FN were decreased （P<0.01）， and renal interstitial fibrosis was improved to varying degrees. ConclusionDahuang Xiezhuo prescription can protect renal function and delay renal interstitial fibrosis in rats with CRF.

ObjectiveTo observe the intervention effect of Dahuang Xiezhuo prescription （DHXZ） on inflammation and suppressor of cytokine signaling 3 （SOCS3）/Toll-like receptor 4 （TLR4） pathway in rats with chronic renal failure （CRF）， and to explore its molecular mechanism in alleviating renal inflammatory response. MethodThe 90 male SD rats， 15 were randomly selected as sham group， and the remaining 75 were used as modeling group to replicate CRF rat model by 5/6 nephrectomy. After successful modeling， the rats were randomly divided into model group， DHXZ low-， medium-， high-dose groups （6.825， 13.65， 27.3 g·kg^-1） and Niaoduqing Granules group （2.6 g·kg^-1）. The drug intervention groups received corresponding drugs by gavage for 8 consecutive weeks. After administration， hematoxylin-eosin （HE） staining and Masson staining were used to observe the morphological changes of rat renal tissue， and blood creatinine （SCr）， blood urea nitrogen （BUN） and blood uric acid （UA） were tested. Enzyme-linked immunosorbent assay （ELISA） was performed to detect the serum contents of interleukin-6 （IL-6）， tumor necrosis factor-α （TNF-α） and C-reactive protein （CRP）. The mRNA expressions of SOCS3 and TLR4 in renal tissue were detected by Real-time fluorescence quantitative polymerase chain reaction （Real-time PCR）， and the protein expressions of SOCS3， TLR4， nuclear transcription factor （NF-κB） and myeloid differentiation factor （MyD88） were detected by Western blot. Immunohistochemistry was used to determine the protein expressions of NF-κB， MyD88， NOD-like receptor protein 3 （NLRP3） and melanoma deficiency factor 2 （AIM2）. ResultCompared with the sham group， the model group had a significant inflammatory response in renal tissue， and an increase in blood SCr， BUN， UTP， IL-6， TNF-α and CRP （P<0.05）. The protein and mRNA expressions of SOCS3 in renal tissue of rats in the model group were lower while the protein expressions of TLR4， NF-κB， MyD88， NLRP3 and AIM2 and the mRNA expression of TLR4 were higher than those in the sham group （P<0.05）. Compared with the model group， DHXZ and Niaoduqing granules groups presented markedly reduced inflammatory response in renal tissue and decreased blood SCr， BUN， UTP， IL-6， TNF-α and CRP （P<0.05）. Additionally， DHXZ and Niaoduqing granules up-regulated the protein and mRNA expressions of SOCS3 in renal tissue while down-regulated the protein expressions of TLR4， NF-κB， MyD88， NLRP3 and AIM2 and the mRNA expression of TLR4 （P<0.05）. ConclusionDHXZ can reduce the release and expression of inflammatory factors， inhibit the inflammatory response and improve renal function， and the mechanism may be related to the regulation of SOCS3/TLR4 signaling pathway.

ObjectiveTo observe the effect of salvianolate on the protein expressions of adenosine monophosphate （AMP）-activated protein kinase （AMPK）， silent information regulator 1 （SIRT1） and peroxisome proliferator-activated receptor-γ coactivator-1α （PGC-1α）， autophagy and apoptosis in kidney tissue of rats with membranous nephropathy （MN）， and to explore its possible molecular mechanism against MN. MethodEighty male SD rats were randomly divided into normal group， model group， benazepril hydrochloride group （10 mg·kg^-1）， and salvianolate low-， medium-， and high-dose groups （16.7， 33.3 and 66.7 mg·kg^-1）. The rats were modeled by injection of cationized bovine serum albumin （C-BSA） into the tail vein. After successful modeling， rats in the administration groups were given corresponding doses of drugs for 4 consecutive weeks， and then 24-hour urine， serum and kidney tissue were collected for the detection of 24-hour urinary protein （UTP）， blood urea nitrogen （BUN）， serum creatinine （SCr）， interleukin-6 （IL-6）， tumor necrosis factor-α （TNF-α）， C reactive protein （CRP）， glutathione peroxidase （GSH-Px）， superoxide dismutase （SOD）， and malondialdehyde （MDA）. The pathological changes of kidneys were observed by light microscope， electron microscope and immunofluorescence. Western blot was used to detect the protein expressions of phospho-AMPK （p-AMPK）， AMPK， phospho-SIRT1 （p-SIRT1）， SIRT1 and PGC-1α in rat kidney tissue. The protein expressions of autophagy-specific gene （Beclin-1）， microtubule-associated protein 1 light chain 3 （LC3） Ⅱ， ubiquitin-binding protein （p62）， B cell lymphoma （Bcl-2）， Bcl-2-associated X （Bax）， and cysteine aspartic protease-7 （Caspase-7） in rat kidney tissue were determined by immunohistochemistry （IHC）. ResultCompared with the conditions in the normal group， the levels of UTP， IL-6， TNF-α， CRP and MDA in the model group were increased （P<0.05） while the levels of SOD and GSH-Px were decreased （P<0.05）， and there was no difference in BUN and SCr. Compared with the model group， the administration groups had lowered UTP， IL-6， TNF-α， CRP and MDA （P<0.05） while elevated SOD and GSH-Px （P<0.05）. It could be seen from hematoxylin and eosin （HE） staining， Masson staining， immunofluorescence and electron microscopy that the pathological damage of rat kidney tissue in the model group was significant， but after treatment with benazepril hydrochloride and salvianolate， the pathological damage of kidney cells was gradually improved. The expressions of p-AMPK/AMPK， p-SIRT1/SIRT1， PGC-1α， Bcl-2， Beclin-1 and LC3Ⅱ in rat kidney in the model group were lower than those in the normal group （P<0.05） while the expressions of Bax， Caspase-7 and p62 were higher （P<0.05）. Compared with the model group， benazepril hydrochloride group and salvianolate groups had an up-regulation in the expressions of p-AMPK/AMPK， p-SIRT1/SIRT1， PGC-1α， Bcl-2， Beclin-1 and LC3Ⅱ in the kidney （P<0.05） while a down-regulation in the expressions of Bax， Caspase-7 and p62 （P<0.05）. ConclusionThe protective effect of salvianolate on the kidneys of MN rats may be related to the activation of AMPK/SIRT1/PGC-1α signaling pathway， the up-regulation of autophagy and the reduction of apoptosis.