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Xue HB, Fan HZ, Meng XM, Cristofaro S, Mekaroonkamol P, Dacha S, Li LY, Fu XL, Zhan SH, Cai Q. Fluoroscopy-guided gastric peroral endoscopic pyloromyotomy (G-POEM): a more reliable and efficient method for treatment of refractory gastroparesis. Surg Endosc 2017; 31:4617-4624. [PMID: 28409375 DOI: 10.1007/s00464-017-5524-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 03/15/2017] [Indexed: 01/08/2023]
Abstract
INTRODUCTION Prior studies show promising results of the gastric peroral endoscopic pyloromyotomy (G-POEM) procedure for treatment of refractory gastroparesis. One major technical challenge involved in this procedure is identifying the pyloric muscular ring (PMR). The aim of this study is to establish a reliable method for identification of the PMR during G-POEM. METHODS Fluoroscopy-guided G-POEM was performed by placing an endoclip at the 9 to 11'o clock position at the pylorus for identification of PMR. Conventional G-POEM was performed by observation of blue colored mucosa at the pylorus area as an indirect marker for PMR. The degree of the PMR identification was graded into well identified, identified, and not identified based on the appearance of the PMR. Procedure times were accurately documented. Gastroparesis cardinal symptoms index and gastric emptying scintigraphy were evaluated before and after the procedure. RESULTS Fourteen patients were studied, seven underwent fluoroscopy-guided G-POEM, and seven patients underwent conventional G-POEM. All procedures achieved technical success and no adverse events occurred. In the seven patients who underwent fluoroscopy-guided G-POEM, the PMR was well identified in four patients and identified in three patients. In the seven patients who underwent conventional G-POEM, the PMR was identified in four patients and not identified in three patients. The average time to complete the fluoroscopy-guided G-POEM was significantly shorter than that of the conventional G-POEM. CONCLUSIONS Fluoroscopy-guided G-POEM by placement of an endoclip at the pylorus was a reliable and safe method to direct the orientation of the submucosal tunnel, to facilitate the location of the PMR, and to shorten the procedure time.
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Affiliation(s)
- H B Xue
- Division of Digestive Diseases, Emory University, 1365 Clifton Road, B1262, Atlanta, GA, 30322, USA
- Department of Gastroenterology, Renji Hospital, Jiaotong University School of Medicine, Shanghai, China
| | - H Z Fan
- Division of Digestive Diseases, Emory University, 1365 Clifton Road, B1262, Atlanta, GA, 30322, USA
- Department of Gastroenterology, Yichun People's Hospital, Yichun Jiangxi, China
| | - X M Meng
- Division of Digestive Diseases, Emory University, 1365 Clifton Road, B1262, Atlanta, GA, 30322, USA
- Division of Gastroenterology, Second Affiliated Hospital of Baotou Medical School, Baotou, Inner Mongolia, China
| | - S Cristofaro
- Division of Digestive Diseases, Emory University, 1365 Clifton Road, B1262, Atlanta, GA, 30322, USA
| | - P Mekaroonkamol
- Division of Digestive Diseases, Emory University, 1365 Clifton Road, B1262, Atlanta, GA, 30322, USA
| | - S Dacha
- Division of Digestive Diseases, Emory University, 1365 Clifton Road, B1262, Atlanta, GA, 30322, USA
| | - L Y Li
- Division of Digestive Diseases, Emory University, 1365 Clifton Road, B1262, Atlanta, GA, 30322, USA
- Division of Digestive Diseases, PLA 306 Hospital, Beijing, China
| | - X L Fu
- Division of Digestive Diseases, Emory University, 1365 Clifton Road, B1262, Atlanta, GA, 30322, USA
- Division of Digestive Diseases, Anshan Hospital, Anshan, China
| | - S H Zhan
- Division of Digestive Diseases, Emory University, 1365 Clifton Road, B1262, Atlanta, GA, 30322, USA
- Department of Gastroenterology, Qingdao Municipal Hospital, Qingdao, China
| | - Q Cai
- Division of Digestive Diseases, Emory University, 1365 Clifton Road, B1262, Atlanta, GA, 30322, USA.
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Hu Y, Feng YY, Xu C, Xue HB, Sun L. Loop-locked coherent population trapping magnetometer based on a fiber electro-optic modulator. Appl Opt 2014; 53:2158-2162. [PMID: 24787175 DOI: 10.1364/ao.53.002158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Accepted: 02/26/2014] [Indexed: 06/03/2023]
Abstract
We have set up a coherent population trapping (CPT)-based magnetometer prototype with the D1 line of ⁸⁷Rb atoms. The dichromatic light field is derived from a fiber electro-optic modulator (FEOM) connected to an external cavity laser diode. A CPT resonance signal with a 516 Hz linewidth is observed. By feeding back the derivative of the resonance curve to the FEOM with a proportional integral controller, of which the voltage output is directly converted to the measured magnetic field intensity, the resonance peak is locked to the environmental magnetic field. The measurement data we have achieved are well matched with the data measured by a commercial fluxgate magnetometer within 2 nT, and the sensitivity is better than 8 pT/√Hz in a parallel B field.
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Xue HB, Feng YY, Wang XJ, Chen S, Zhou ZY. Note: Generation of Raman laser beams based on a sideband injection-locking technique using a fiber electro-optical modulator. Rev Sci Instrum 2013; 84:046104. [PMID: 23635238 DOI: 10.1063/1.4802257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Two phase-coherent Raman laser beams with a frequency offset of 6.835 GHz were generated by sideband injection-locking technique. A master diode laser was phase-modulated at 6.835 GHz by a fiber electro-optic modulator. A slave diode was injection-locked to the -1 sideband of the phase-modulated beam, and another diode was locked to the master laser carrier. This method produced stable and spatially separated Raman lasers with a large frequency shift range (>180 MHz). The relative linewidth of these two beams was ∼1 Hz, and the unwanted carrier mode was suppressed down to -24 dB. Stimulated Raman transitions and Ramsey fringes were driven by Raman lasers in a cold atomic beam.
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Affiliation(s)
- H B Xue
- State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China
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Xue HB, Tan HH, Liu WZ, Chen XY, Feng N, Gao YJ, Song Y, Zhao YJ, Ge ZZ. A pilot study of endoscopic spray cryotherapy by pressurized carbon dioxide gas for Barrett's esophagus. Endoscopy 2011; 43:379-85. [PMID: 21437849 DOI: 10.1055/s-0030-1256334] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
BACKGROUND AND STUDY AIMS Endoscopic spray cryoablation is a novel approach for the treatment of Barrett's esophagus. However, few studies have reported its efficacy, especially with the use of carbon dioxide (CO (2)). The aim of the current study was to evaluate the short term efficacy and complications using CO (2) in endoscopic cryoablation of Barrett's esophagus. METHODS Patients diagnosed with Barrett's esophagus underwent monthly stepwise cryoablation with pressurized CO (2) gas, with follow-up esophageal biopsies until complete histological reversal was achieved. Responses were analyzed with an intention-to-treat analysis according to complete response for intestinal metaplasia (CR-IM), which was defined as the elimination of all intestinal metaplasia including specialized intestinal metaplasia (SIM), subsquamous SIM, and dysplasia with intestinal metaplasia in the biopsies under narrow-band imaging (NBI). RESULTS In total, 22 patients were enrolled, 20 of whom completed the treatment. Two patients declined further ablation after the first cryotherapy session. A total of 44 sessions were performed; a median of 2 sessions per patient (range 1 - 3 sessions) were needed to complete the ablation of Barrett's esophagus. No severe complications occurred. Follow-up endoscopies were performed in 20 patients (90.9 %). Two patients (9.1 %) were lost to follow-up. Median follow-up was 10 months (range 6 - 18 months). After cryotherapy, 20 patients (90.9 %) reached CR-IM of Barrett's esophagus. Patients underwent a median number of 3 follow-up endoscopies (range 2 - 4) with biopsies. At 6 months, recurrence was evident in three patients (13.6 % of the overall population, 15.0 % of the CR-IM population). One of the three patients developed intestinal metaplasia but no dysplastic change and the other two developed subsquamous SIM. CONCLUSIONS The pressurized CO (2) spray cryotherapy is a relatively effective and safe endoscopic treatment for Barrett's esophagus.
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Affiliation(s)
- H B Xue
- Department of Gastroenterology, Shanghai Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai Institute of Digestive Disease, 145 Shan-dong Zhong Rd., Shanghai, China
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Xue HB, Jansen S, Prasch A, Sigg L. Nickel speciation and complexation kinetics in freshwater by ligand exchange and DPCSV. Environ Sci Technol 2001; 35:539-546. [PMID: 11351726 DOI: 10.1021/es0014638] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A technique of ligand exchange with DMG (dimethylglyoxime) and DPCSV was applied to determine Ni speciation in lake, river, and groundwater samples. The working conditions related to ligand-exchange equilibrium were optimized, and the ligand-exchange kinetics were examined. The observed pseudo-first-order rate, kobsd, was about 3 x 10(-5) (s-1) for Ni(DMG)2 complex formation with an excess of DMG (microM) over Ni (nM) at pH 7.1-7.7. The second-order exchange kinetic constants, kexch, were between 1.2 x 10(2) and 5.7 x 10(3) s-1 M-1 for ligand exchange of NiEDTA with DMG and between 5 x 10(2) and 7 x 10(3) s-1 M-1 for exchange of natural ligands with DMG in the freshwater samples under similar conditions. Ni ligand exchange between natural ligands and DMG occurred over days with half-lifes of 5-95 h. Total dissolved Ni concentrations in samples from various freshwater systems in Switzerland ranged from 4 nM in an oligotrophic lake to 30 nM in a small river affected by inputs from sewage effluents and agriculture. Free ionic Ni2+ concentrations were determined in the range of 10(-13)-10(-15) M (pNi = 12.2-14.7), indicating that more than 99.9% of dissolved Ni was bound by organic ligands with strong affinity (log K 12.1-14.9) and low concentrations (13-100 nM) at pH 7.2-8.2. Because of slow ligand-exchange kinetics, Ni speciation in natural waters may in many cases not reach equilibrium.
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Affiliation(s)
- H B Xue
- Swiss Federal Institute for Environmental Science and Technology (EAWAG), CH-6047 Kastanienbaum, Switzerland.
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