Clinical Value of Ultrasound in Evaluating Stent Placement for Managing Graft Stenosis after Meso-rex Bypass / 中国医学科学院学报

Objective To explore the feasibility of using ultrasound to evaluate stent placement for managing graft stenosis after Meso-rex bypass for cavernous transformation of the portal vein in adults. Methods This study enrolled the patients who underwent Meso-rex bypass due to cavernous transformation of the portal vein,were diagnosed graft stenosis by postoperative ultrasound,and then underwent percutaneous portal vein puncture portography and stent placement.We then compared the ultrasonic measurement indicators and sonographic manifestations before and after stent placement,and evaluated the alleviation of portal hypertension symptoms after stent placement and related clinical indexes. Results Finally,8 patients were enrolled in this study,including 5 males and 3 females,with an average age of(32.4±14.7)years.The median duration of follow-up was 26 months after stent placement.The mean diameter of graft stenosis was(2.74±0.23)mm after Meso-rex bypass and became wider[(7.23±0.68)mm]after stent placement(

Transcatheter arterial chemoembolization followed by surgical resection for hepatocellular carcinoma: a focus on its controversies and screening of patients most likely to benefit / 中华医学杂志(英文版)

Surgical resection (SR) is recommended as a radical procedure in the treatment of hepatocellular carcinoma (HCC). However, postoperative recurrence negatively affects the long-term efficacy of SR, and preoperative adjuvant therapy has therefore become a research hotspot. Some clinicians adopt transcatheter arterial chemoembolization (TACE) as a preoperative adjuvant therapy in patients undergoing SR to increase the resection rate, reduce tumor recurrence, and improve the prognosis. However, the findings of the most relevant studies remain controversial. Some studies have confirmed that preoperative TACE cannot improve the long-term survival rate of patients with HCC and might even negatively affect the resection rate. Which factors influence the efficacy of preoperative TACE combined with SR is a topic worthy of investigation. In this review, existing clinical studies were analyzed with a particular focus on several topics: screening of the subgroups of patients most likely to benefit from preoperative TACE, exploration of the optimal treatment regimen of preoperative TACE, and determination of the extent of tumor necrosis as the deciding prognostic factor.

Rationale and study design for one-stop assessment of renal artery stenosis and renal microvascular perfusion with contrast-enhanced ultrasound for patients with suspected renovascular hypertension / 中华医学杂志(英文版)

BACKGROUND@#Renal artery stenosis (RAS) is always associated with abnormalities in renal microvascular perfusion (RMP). However, few imaging methods can simultaneously evaluate the degree of luminal stenosis and RMP. Thus, this study will aim to evaluate the feasibility of using contrast-enhanced ultrasound (CEUS) for assessing both RAS and RMP to achieve a one-stop assessment of patients with suspected renovascular hypertension.@*METHODS@#This will be a single-center diagnostic study with a sample size of 440. Patients with chronic kidney disease (CKD) and suspected of having resistant hypertension will be eligible. Patients with Stages 1-3 CKD will undergo CEUS and computed tomography (CT) angiography (CTA). Values obtained by CEUS and CTA for diagnosing low-grade (lumen reduced by <60%) and high-grade (lumen reduced by ≥60%) RAS will be compared. Moreover, all patients will also undergo radionuclide imaging. The diagnostic value for RAS will be assessed by the receiver operating characteristic curve, including the accuracy, sensitivity, specificity, positive predictive values, negative predictive values, and area under the ROC. Pearson correlation analysis will be performed to assess the association between CEUS findings for RMP and glomerular filtration rate measured by a radionuclide imaging method.@*CONCLUSION@#The data gathered from this study will be used to evaluate the feasibility of expanding clinical applications of CEUS for evaluation of patients with suspected renovascular hypertension.@*TRIAL REGISTRATION@#Chinese Clinical Trial Registry, ChiCTR1800016252; https://www.chictr.org.cn.

The role of nitric oxide in lung injury associated with acute necrotizing pancreatitis / 中华外科杂志

<p><b>OBJECTIVE</b>To discuss the role of nitric oxide (NO) in lung injury associated with acute necrotizing pancreatitis (ANP).</p><p><b>METHODS</b>One hundred and twenty SD rats were randomized into five groups: control group, ANP group, L-arginine (L-arg) pretreatment group, L-NAME pretreatment group, and mixed pretreatment group (n = 24 for each group). Rat ANP model was induced by intraductal administration of 3% sodium taurocholate. Alveolar macrophages (AMs) were obtained by bronchoalveolar lavage. The protein content of bronchoalveolar lavage fluids (BALF), the myeloperoxidase (MPO) of lung tissue and generation of tumor necrosis factor alpha (TNFalpha)and NO by alveolar macrophages were evaluated. The expression of TNFalpha mRNA and iNOS mRNA was also measured.</p><p><b>RESULTS</b>Lung injury was aggravated gradually with progression of the disease. The level of MPO of lung tissue and the protein content of BALF showed a steady increase with time and peaked at the 12(th) hour (10.8 +/- 0.6 U/g for MPO and 2,011.0 +/- 105.5 micro g/ml for protein, respectively). TNFalpha and NO secreted by AMs were elevated gradually and peaked at the 6(th) hour (1,624.2 +/- 149.2 pg/ml and 88.8 +/- 6.5 micro mol/L respectively) but decreased at the 12(th) hour. The expression of TNFalpha mRNA and iNOS mRNA was similar with the change of TNFalpha and NO. The parameters of the groups of L-arg, L-NAME and the mixed pretreatment were similar to those of ANP group. The parameters compared with those of the control group showed a significant difference (P < 0.05). The parameters of groups of L-Arg and L-NAME pretreatment in comparison with those of the ANP group showed significant difference (P < 0.05).</p><p><b>CONCLUSIONS</b>Over production of NO mediated by iNOS aggravates lung injury caused by acute necrotizing pancreatitis. Administration of exogenous NOS substrate would worsen lung injury, whereas administration NOS inhibitor would alleviate lung injury.</p>