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Wu DQ, Yang YS, Zhang WF, Lv ZJ, Yang ZF, Li Y. [Intravenous infusion of methylene blue to visualize the ureter in laparoscopic colorectal surgery]. Zhonghua Wei Chang Wai Ke Za Zhi 2022; 25:1098-1103. [PMID: 36562233 DOI: 10.3760/cma.j.cn441530-20220526-00229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Objective: Intraoperative localization of the ureter can contribute to accurate dissection and minimize ureteral injury in colorectal surgery. We aim to summarize a single center's experience of fluorescence ureteral visualization using methylene blue (MB) and explore its visualization efficiency. Methods: This is a descriptive case-series-study. Clinical data of patients who had undergone laparoscopic colorectal surgery and fluorescence visualization of the ureter in the Gastrointestinal Surgery Department of Guangdong Provincial People's Hospital from March 2022 to May 2022 were retrospectively collected. Patients with incomplete surgery videos, renal insufficiency, or allergic reactions were excluded. MB was infused with 0.9% NaCl at 1.0 mg/kg in 100 mL of normal saline for 5 to 15 minutes during laparoscopic exploration. Imaging was performed using a device developed in-house by OptoMedic (Guangdong, China) that operates at 660nm to achieve excitation of MB. Clinical information, MB dosage, rate of successful fluorescence, time to fluorescence, operation time, blood loss, intraoperative blood oxygen levels, pathological staging, changes in renal function, and post-operative complications were retrospectively analyzed. Results: The study cohort comprised 27 patients (24 men and 3 women) with an average age of (60.25±16.95) years and an average body mass index of (21.72±3.42) kg/m2. The dosage of MB was 0.3-1.0 mg/kg and the infusion time was 5-15 minutes. Fluorescence signals were detected in all patients. The median time to signal detection was 20 (range, 10 to 40) minutes after MB infusion. The range of intraoperative blood oxygen fluctuation averaged 2.5% (range, 0 to 7.0%). The median change in creatine concentration was -1.3 (range, -17.2 to 29.2) µmol/L. No patients had complications associated with use of MB. Fluorescence visualization of the ureter was very valuable clinically in two patients (thick mesentery, stage T4). Conclusion: MB is a safe and effective means of visualizing the ureter by fluorescence during laparoscopic colorectal surgery, especially when the procedure is difficult. MB in a dosage of less than 1 mg/kg can slowly infused for more than 5 minutes during laparoscopic exploration. During the infusion, attention must be paid to blood oxygen fluctuations.
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Affiliation(s)
- D Q Wu
- Department of Gastrointestinal Surgery, Department of General Surgery, Guangdong Provincial Hospital, Guandong Academy of Medical Science, Guangzhou 510080, China The Second School of Clinical Medicine, Southern Medical University, Guangzhou 510515, China
| | - Y S Yang
- Department of Gastrointestinal Surgery, Department of General Surgery, Guangdong Provincial Hospital, Guandong Academy of Medical Science, Guangzhou 510080, China Shantou University Medical College, Shantou 515041, China
| | - W F Zhang
- Department of Gastrointestinal Surgery, Department of General Surgery, Guangdong Provincial Hospital, Guandong Academy of Medical Science, Guangzhou 510080, China Guangdong Medical University, Zhanjiang 524023, China
| | - Z J Lv
- Department of Gastrointestinal Surgery, Department of General Surgery, Guangdong Provincial Hospital, Guandong Academy of Medical Science, Guangzhou 510080, China
| | - Z F Yang
- Department of Gastrointestinal Surgery, Department of General Surgery, Guangdong Provincial Hospital, Guandong Academy of Medical Science, Guangzhou 510080, China
| | - Yong Li
- Department of Gastrointestinal Surgery, Department of General Surgery, Guangdong Provincial Hospital, Guandong Academy of Medical Science, Guangzhou 510080, China The Second School of Clinical Medicine, Southern Medical University, Guangzhou 510515, China
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Yang T, Wu Q, Li SY, Lv ZJ, Hu B, Xie BJ, Sun ZD. Liposoluble Compounds with Antioxidant Activity from Strobilanthes tonkinensis. Chem Nat Compd 2014. [DOI: 10.1007/s10600-014-0852-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Wang HG, Wang XF, Jing XY, Li Z, Zhang Y, Lv ZJ. Effect of mutations in a simian virus 40 PolyA signal enhancer on green fluorescent protein reporter gene expression. Genet Mol Res 2011; 10:1866-83. [PMID: 21948750 DOI: 10.4238/vol10-3gmr1169] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Our previous studies have shown that tandem Alu repeats inhibit green fluorescent protein (GFP) gene expression when inserted downstream of the GFP gene in the pEGFP-C1 vector. We found that the 22R sequence (5'-GTGAAAAAAATGCTTTATTTGT-3') from the antisense PolyA (240 bp polyadenylation signal) of simian virus 40, eliminated repression of GFP gene expression when inserted between the GFP gene and the Alu repeats. The 22R sequence contains an imperfect palindrome; based on RNA structure software prediction, it forms an unstable stem-loop structure, including a loop, a first stem, a bulge, and a second stem. Analysis of mutations of the loop length of the 22R sequence showed that the three-nucleotide loop (wild-type, 22R) induced much stronger GFP expression than did other loop lengths. Two mutations, 4TMI (A7→T, A17→T) and 5AMI (A6→T, T18→A), which caused the base type changes in the bulge and in the second stem in the 22R sequence, induced stronger GFP gene expression than 22R itself. Mutation of the bulge base (A17→T), leading to complete complementation of the stem, caused weaker GFP gene expression. Sequences without a palindrome (7pieA, 5'-GTGAAAAAAATG CAAAAAAAGT-3', 7pieT, 5'-GTGTTTTTTTTGCTTTTTTTGT-3') did not activate GFP gene expression. We conclude that an imperfect palindrome affects and can increase GFP gene expression.
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Affiliation(s)
- H G Wang
- Hebei Key Lab of Laboratory Animal, Department of Genetics, Hebei Medical University, Shijiazhuang, Hebei Province, China
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