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Publication Record


Anaphylactoid Reactions After Instillation of Contrast Material Into the Urinary Tract: A Survey of Contemporary Practice Patterns and Review of the Literature.
Dai JC, Brisbane WG, Chang HC, Hsi RS, Harper JD
(2018) Urology 122: 58-63
MeSH Terms: Anaphylaxis, Contrast Media, Drug Hypersensitivity, Endoscopy, Humans, Incidence, Instillation, Drug, Practice Guidelines as Topic, Practice Patterns, Physicians', Societies, Medical, Surveys and Questionnaires, Urinary Tract, Urologists, Urology
Show Abstract · Added February 26, 2019
OBJECTIVE - To assess drug reactions (ADRs) encountered by practicing urologists for contrast instilled into the urinary collecting system, and to describe current practice patterns regarding contrast administration into the urinary tract for patients with known contrast allergies.
METHODS - Endourological Society members were e-mailed a web-based survey about their prior experience with contrast-related ADRs and practices for contrast administration into the urinary tract among patients with known intravenous contrast allergies. Chi-squared analysis was used to compare management patterns between patients with established allergies and those without.
RESULTS - An estimated 2300-2500 e-mails were reached, resulting in an estimated response rate of 6.3%-8%. Over 75% of respondents were fellowship trained. Average time in practice was 16 years, and respondents performed a mean of 6.7 urologic contrast studies per week. Among respondents, 32.6%, 14.7%, and 4.0% had treated at least 1 patient with a mild, moderate, or severe reaction, respectively. Contrast-related ADRs were most commonly associated with retrograde pyelogram (50%). For patients with known contrast allergies, 5.4% pursue additional work-up before administering contrast in the urinary tract. Pretreatment with antihistamine or steroids is used by 24.8% and 23.4%, respectively. When performing retrograde pyelograms for such patients, urologists are more likely to use dilute contrast (P = .003), but otherwise do not significantly alter technique.
CONCLUSION - Contrast ADRs are encountered not infrequently among practicing urologists. There is notable practice variation in the management of patients with known contrast allergies, though the overall perceived risk of contrast use in these patients is low, provided good technique is used.
Copyright © 2018 Elsevier Inc. All rights reserved.
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14 MeSH Terms
Oncologic effects of preoperative biliary drainage in resectable hilar cholangiocarcinoma: Percutaneous biliary drainage has no adverse effects on survival.
Zhang XF, Beal EW, Merath K, Ethun CG, Salem A, Weber SM, Tran T, Poultsides G, Son AY, Hatzaras I, Jin L, Fields RC, Weiss M, Scoggins C, Martin RCG, Isom CA, Idrees K, Mogal HD, Shen P, Maithel SK, Schmidt CR, Pawlik TM
(2018) J Surg Oncol 117: 1267-1277
MeSH Terms: Aged, Bile Duct Neoplasms, Drainage, Endoscopy, Female, Follow-Up Studies, Humans, Klatskin Tumor, Male, Middle Aged, Preoperative Care, Prognosis, Survival Rate
Show Abstract · Added April 10, 2018
BACKGROUND AND OBJECTIVES - The objective of the current study was to define long-term survival of patients with resectable hilar cholangiocarcinoma (HCCA) after preoperative percutaneous transhepatic biliary drainage (PTBD) versus endoscopic biliary drainage (EBD).
METHODS - Between 2000 and 2014, 240 patients who underwent curative-intent resection for HCCA were identified at 10 major hepatobiliary centers. Postoperative morbidity and mortality, as well as disease-specific survival (DSS) and recurrence-free survival (RFS) were analyzed among patients.
RESULTS - The median decrease in total bilirubin levels after biliary drainage was similar comparing PTBD (n = 104) versus EBD (n = 92) (mg/dL, 4.9 vs 4.9, P = 0.589) before surgery. There was no difference in baseline demographic characteristics, type of surgical procedure performed, final AJCC tumor stage or postoperative morbidity among patients who underwent EBD only versus PTBD (all P > 0.05). Patients who underwent PTBD versus EBD had a comparable long-term DSS (median, 43.7 vs 36.9 months, P = 0.802) and RFS (median, 26.7 vs 24.0 months, P = 0.571). The overall pattern of recurrence relative to regional or distant disease was also the same among patients undergoing PTBD and EBD (P = 0.669) CONCLUSIONS: Oncologic outcomes including DSS and RFS were similar among patients who underwent PTBD versus EBD with no difference in tumor recurrence location.
© 2017 Wiley Periodicals, Inc.
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13 MeSH Terms
Optic nerve sheath fenestration using a Raman-shifted alexandrite laser.
Kozub J, Shen JH, Joos KM, Prasad R, Hutson MS
(2016) Lasers Surg Med 48: 270-80
MeSH Terms: Animals, Decompression, Surgical, Endoscopy, Lasers, Solid-State, Nerve Compression Syndromes, Neurosurgical Procedures, Optic Nerve, Pseudotumor Cerebri, Spectrum Analysis, Raman, Swine
Show Abstract · Added March 19, 2018
BACKGROUND AND OBJECTIVE - Optic nerve sheath fenestration is an established procedure for relief of potentially damaging overpressure on the optic nerve resulting from idiopathic intracranial hypertension. Prior work showed that a mid-IR free-electron laser could be delivered endoscopically and used to produce an effective fenestration. This study evaluates the efficacy of fenestration using a table-top mid-IR source based on a Raman-shifted alexandrite (RSA) laser.
STUDY DESIGN/MATERIALS AND METHODS - Porcine optic nerves were ablated using light from an RSA laser at wavelengths of 6.09, 6.27, and 6.43 μm and pulse energies up to 3 mJ using both free-space and endoscopic beam delivery through 250-μm I.D. hollow-glass waveguides. Waveguide transmission was characterized, ablation thresholds and etch rates were measured, and the efficacy of endoscopic fenestration was evaluated for ex vivo exposures using both optical coherence tomography and histological analysis.
RESULTS - Using endoscopic delivery, the RSA laser can effectively fenestrate porcine optic nerves. Performance was optimized at a wavelength of 6.09 μm and delivered pulse energies of 0.5-0.8 mJ (requiring 1.5-2.5 mJ to be incident on the waveguide). Under these conditions, the ablation threshold fluence was 0.8 ± 0.2 J/cm(2) , the ablation rate was 1-4 μm/pulse, and the margins of ablation craters showed little evidence of thermal or mechanical damage. Nonetheless, nominally identical exposures yielded highly variable ablation rates. This led to fenestrations that ranged from too deep to too shallow-either damaging the underlying optic nerve or requiring additional exposure to cut fully through the sheath. Of 48 excised nerves subjected to fenestration at 6.09 μm, 16 ex vivo fenestrations were judged as good, 23 as too deep, and 9 as too shallow.
CONCLUSIONS - Mid-IR pulses from the RSA laser, propagated through a flexible hollow waveguide, are capable of cutting through porcine optic nerve sheaths in surgically relevant times with reasonable accuracy and low collateral damage. This can be accomplished at wavelengths of 6.09 or 6.27 μm, with 6.09 μm slightly preferred. The depth of ex vivo fenestrations was difficult to control, but excised nerves lack a sufficient layer of cerebrospinal fluid that would provide an additional margin of safety in actual patients.
© 2015 Wiley Periodicals, Inc.
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10 MeSH Terms
DNA Methylation Predicts Progression of Human Gastric Lesions.
Schneider BG, Mera R, Piazuelo MB, Bravo JC, Zabaleta J, Delgado AG, Bravo LE, Wilson KT, El-Rifai W, Peek RM, Correa P
(2015) Cancer Epidemiol Biomarkers Prev 24: 1607-13
MeSH Terms: Adenocarcinoma, Adult, Anti-Bacterial Agents, Biomarkers, Tumor, Chemoprevention, DNA Methylation, DNA, Neoplasm, Disease Progression, Double-Blind Method, Endoscopy, Gastrointestinal, Female, Forecasting, Gastric Mucosa, Helicobacter Infections, Helicobacter pylori, Humans, Male, Middle Aged, Polymerase Chain Reaction, Precancerous Conditions, Stomach Neoplasms
Show Abstract · Added September 28, 2015
BACKGROUND - Development of the intestinal subtype of gastric adenocarcinoma is marked by a progression of histopathologic lesions. Residents of the Andean regions of Colombia are at high risk for gastric cancer.
METHODS - A cohort of 976 Colombian subjects was followed over 16 years examining effects of Helicobacter pylori eradication and treatment with antioxidants on progression of lesions. We performed methylation analysis of DNA from baseline antral biopsies from 104 subjects for whom follow-up data were available for at least 12 years. Methylation was quantitated for AMPH, CDKN2A, CDH1, EN1, EMX1, NKX6-1, PCDH10, RPRM, RSPO2, SORCS3, ZIC1, and ZNF610 genes, using Pyrosequencing.
RESULTS - Levels of DNA methylation were associated with baseline diagnosis for AMPH, EMX1, RPRM, RSPO2, SORCS3, and ZNF610. After adjusting for baseline diagnosis and H. pylori infection, methylation levels of AMPH, PCDH10, RSPO2, and ZNF610 had progression coefficients that increased and P values that decreased over 6, 12, and 16 years. Methylation for SORCS3 was associated with progression at all 3 time points but without the continual strengthening of the effect. Scores for mononuclear leukocytes, polymorphonuclear leukocytes, or intraepithelial lymphocytes were unrelated to progression.
CONCLUSIONS - Methylation levels of AMPH, PCDH10, RSPO2, SORCS3, and ZNF610 predict progression of gastric lesions independent of the effect of duration of H. pylori infection, baseline diagnosis, gender of the patient, or scores for mononuclear leukocytes, polymorphonuclear leukocytes, or intraepithelial lymphocytes.
IMPACT - DNA methylation levels in AMPH, PCDH10, RSPO2, SORCS3, and ZNF610 may contribute to identification of persons with gastric lesions likely to progress.
©2015 American Association for Cancer Research.
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4 Members
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21 MeSH Terms
The Pathogenesis and Management of Achalasia: Current Status and Future Directions.
Ates F, Vaezi MF
(2015) Gut Liver 9: 449-63
MeSH Terms: Botulinum Toxins, Deglutition Disorders, Diagnostic Errors, Endoscopy, Digestive System, Esophageal Achalasia, Esophageal Sphincter, Lower, Esophagus, Gastroesophageal Reflux, Humans, Injections, Subcutaneous, Manometry, Neurotransmitter Agents, Recurrence
Show Abstract · Added September 28, 2015
Achalasia is an esophageal motility disorder that is commonly misdiagnosed initially as gastroesophageal reflux disease. Patients with achalasia often complain of dysphagia with solids and liquids but may focus on regurgitation as the primary symptom, leading to initial misdiagnosis. Diagnostic tests for achalasia include esophageal motility testing, esophagogastroduodenoscopy and barium swallow. These tests play a complimentary role in establishing the diagnosis of suspected achalasia. High-resolution manometry has now identified three subtypes of achalasia, with therapeutic implications. Pneumatic dilation and surgical myotomy are the only definitive treatment options for patients with achalasia who can undergo surgery. Botulinum toxin injection into the lower esophageal sphincter should be reserved for those who cannot undergo definitive therapy. Close follow-up is paramount because many patients will have a recurrence of symptoms and require repeat treatment.
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13 MeSH Terms
Accuracy of capsule colonoscopy in detecting colorectal polyps in a screening population.
Rex DK, Adler SN, Aisenberg J, Burch WC, Carretero C, Chowers Y, Fein SA, Fern SE, Fernandez-Urien Sainz I, Fich A, Gal E, Horlander JC, Isaacs KL, Kariv R, Lahat A, Leung WK, Malik PR, Morgan D, Papageorgiou N, Romeo DP, Shah SS, Waterman M
(2015) Gastroenterology 148: 948-957.e2
MeSH Terms: Adenomatous Polyps, Capsule Endoscopy, Colonic Polyps, Colonoscopy, Colorectal Neoplasms, False Negative Reactions, Female, Humans, Hyperplasia, Intestinal Polyps, Israel, Male, Mass Screening, Middle Aged, Predictive Value of Tests, Prospective Studies, Rectal Diseases, Tumor Burden, United States
Show Abstract · Added May 18, 2016
BACKGROUND & AIMS - Capsule colonoscopy is a minimally invasive imaging method. We measured the accuracy of this technology in detecting polyps 6 mm or larger in an average-risk screening population.
METHODS - In a prospective study, asymptomatic subjects (n = 884) underwent capsule colonoscopy followed by conventional colonoscopy (the reference) several weeks later, with an endoscopist blinded to capsule results, at 10 centers in the United States and 6 centers in Israel from June 2011 through April 2012. An unblinded colonoscopy was performed on subjects found to have lesions 6 mm or larger by capsule but not conventional colonoscopy.
RESULTS - Among the 884 subjects enrolled, 695 (79%) were included in the analysis of capsule performance for all polyps. There were 77 exclusions (9%) for inadequate cleansing and whole-colon capsule transit time fewer than 40 minutes, 45 exclusions (5%) before capsule ingestion, 15 exclusions (2%) after ingestion and before colonoscopy, and 15 exclusions (2%) for site termination. Capsule colonoscopy identified subjects with 1 or more polyps 6 mm or larger with 81% sensitivity (95% confidence interval [CI], 77%-84%) and 93% specificity (95% CI, 91%-95%), and polyps 10 mm or larger with 80% sensitivity (95% CI, 74%-86%) and 97% specificity (95% CI, 96%-98%). Capsule colonoscopy identified subjects with 1 or more conventional adenomas 6 mm or larger with 88% sensitivity (95% CI, 82%-93) and 82% specificity (95% CI, 80%-83%), and 10 mm or larger with 92% sensitivity (95% CI, 82%-97%) and 95% specificity (95% CI, 94%-95%). Sessile serrated polyps and hyperplastic polyps accounted for 26% and 37%, respectively, of false-negative findings from capsule analyses.
CONCLUSIONS - In an average-risk screening population, technically adequate capsule colonoscopy identified individuals with 1 or more conventional adenomas 6 mm or larger with 88% sensitivity and 82% specificity. Capsule performance seems adequate for patients who cannot undergo colonoscopy or who had incomplete colonoscopies. Additional studies are needed to improve capsule detection of serrated lesions. Clinicaltrials.gov number: NCT01372878.
Copyright © 2015 AGA Institute. Published by Elsevier Inc. All rights reserved.
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19 MeSH Terms
Endoscopic Mucosal Impedance Measurements Correlate With Eosinophilia and Dilation of Intercellular Spaces in Patients With Eosinophilic Esophagitis.
Katzka DA, Ravi K, Geno DM, Smyrk TC, Iyer PG, Alexander JA, Mabary JE, Camilleri M, Vaezi MF
(2015) Clin Gastroenterol Hepatol 13: 1242-1248.e1
MeSH Terms: Adolescent, Adult, Animals, Electric Impedance, Endoscopy, Eosinophilia, Eosinophilic Esophagitis, Extracellular Space, Female, Histocytochemistry, Humans, Male, Middle Aged, Mucous Membrane, Young Adult
Show Abstract · Added September 28, 2015
BACKGROUND & AIMS - Penetration of the esophageal epithelium by food antigens is an early event in the pathogenesis of eosinophilic esophagitis (EoE), but the precise relationship among eosinophilia, dilated intercellular spaces (DIS), and decreased barrier function is unclear. We investigated the correlation between site-specific mucosal impedance (MI) measurements of ion flux and esophageal histology, and whether MI measurements can be used to distinguish between patients with active and inactive EoE.
METHODS - MI was measured (in Ω) in 10 patients with active EoE (>15 eosinophils [eos]/high-power field [HPF]) and in 10 with inactive EoE (<15 eos/HPF, as a result of treatment), and mucosal biopsy specimens were collected from 4 esophageal sites (2, 5, 10, and 15 cm above the Z-line). MI also was measured in 10 individuals without esophageal symptoms (controls). MI measurements, eos/HPF, and DIS grade were compared among patients with EoE and controls.
RESULTS - The esophageal MI values were significantly lower in patients with active EoE (1909 Ω) compared with inactive EoE (4349 Ω) or controls (5530 Ω) (P < .001). Biopsy specimens from 4 patients with active EoE contained fewer than 15 eos/HPF and lower-grade DIS than in patients with active disease. There were significant inverse correlations between MI and eos/HPF (rs = -.584), as well as between MI and DIS (rs = -.531; P < .001). The MI cut-off value of 2300 Ω identified patients with active EoE with 90% sensitivity and 91% specificity, and high-grade DIS with 89% sensitivity and 82% specificity.
CONCLUSIONS - In patients with EoE, eosinophilia and DIS correlate with MI measurements of ion flux. Endoscopic MI measurement in the esophagus is safe and easy to perform, and can be used to assess activity of diseases such as EoE.
Copyright © 2015 AGA Institute. Published by Elsevier Inc. All rights reserved.
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15 MeSH Terms
A new paradigm for treatment of glaucoma.
Galloway RL, Delisi M, Harth EM, Mawn LA
(2014) Conf Proc IEEE Eng Med Biol Soc 2014: 6147-50
MeSH Terms: Animals, Blindness, Delayed-Action Preparations, Endoscopy, Equipment Design, Glaucoma, Humans, Magnetic Resonance Imaging, Nanoparticles, Nanostructures, Nanotechnology, Neuroprotective Agents, Phantoms, Imaging, Polyesters, Skull, Swine
Show Abstract · Added February 15, 2016
Glaucoma is the leading irreversible cause of blindness in the world. We are developing a new image-guidance system to deliver a neuroprotective drug in a controlled release nanosponge. The system consists of a magnetically tracked image-guidance system, the nanosponge material and the drug. We have characterized the performance of each aspect in phantoms, animals and ex-vivo human tissue.
0 Communities
1 Members
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16 MeSH Terms
A platform for gastric cancer screening in low- and middle-income countries.
Caprara R, Obstein KL, Scozzarro G, Di Natali C, Beccani M, Morgan DR, Valdastri P
(2015) IEEE Trans Biomed Eng 62: 1324-32
MeSH Terms: Animals, Capsule Endoscopy, Developing Countries, Early Detection of Cancer, Female, Global Health, Humans, Image Interpretation, Computer-Assisted, Robotics, Stomach Neoplasms, Swine, Water
Show Abstract · Added May 18, 2016
Gastric cancer is the second leading cause of cancer death worldwide and screening programs have had a significant impact on reducing mortality. The majority of cases occur in low- and middle-income countries (LMIC), where endoscopy resources are traditionally limited. In this paper, we introduce a platform designed to enable inexpensive gastric screening to take place in remote areas of LMIC. The system consists of a swallowable endoscopic capsule connected to an external water distribution system by a multichannel soft tether. Pressurized water is ejected from the capsule to orient the view of the endoscopic camera. After completion of a cancer screening procedure, the outer shell of the capsule and the soft tether can be disposed, while the endoscopic camera is reclaimed without needing further reprocessing. The capsule, measuring 12 mm in diameter and 28 mm in length, is able to visualize the inside of the gastric cavity by combining waterjet actuation and the adjustment of the tether length. Experimental assessment was accomplished through a set of bench trials, ex vivo analysis, and in vivo feasibility validation. During the ex vivo trials, the platform was able to visualize the main landmarks that are typically observed during a gastric cancer screening procedure in less than 8 min. Given the compact footprint, the minimal cost of the disposable parts, and the possibility of running on relatively available and inexpensive resources, the proposed platform can potentially widen gastric cancer screening programs in LMIC.
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12 MeSH Terms
Controlled colonic insufflation by a remotely triggered capsule for improved mucosal visualization.
Pasricha T, Smith BF, Mitchell VR, Fang B, Brooks ER, Gerding JS, Washington MK, Valdastri P, Obstein KL
(2014) Endoscopy 46: 614-8
MeSH Terms: Animals, Capsule Endoscopy, Carbon Dioxide, Colon, Colonoscopy, Feasibility Studies, Female, Insufflation, Intestinal Mucosa, Swine
Show Abstract · Added April 12, 2016
BACKGROUND AND STUDY AIMS - Capsule endoscopy is an attractive alternative to colorectal cancer screening by conventional colonoscopy, but is currently limited by compromised mucosal visibility because of the lack of safe, controlled colonic insufflation. We have therefore developed a novel system of untethered, wireless-controlled carbon dioxide (CO2) insufflation for use in colonic capsule endoscopy, which this study aims to assess in vivo.
MATERIAL AND METHODS - This observational, nonsurvival, in vivo study used five Yorkshire-Landrace cross swine. A novel insufflation capsule was placed in the porcine colons, and we recorded volume of insufflation, time, force, visualization, and a pathologic assessment of the colon.
RESULTS - The mean (standard deviation [SD]) diameter of insufflation was 32.1 (3.9) mm. The volume of CO2 produced successfully allowed complete endoscopic visualization of the mucosa and safe proximal passage of the endoscope. Pathologic examination demonstrated no evidence of trauma caused by the capsule.
CONCLUSIONS - These results demonstrate the feasibility of a novel method of controlled colonic insufflation via an untethered capsule in vivo. This technological innovation addresses a critical need in colon capsule endoscopy.
© Georg Thieme Verlag KG Stuttgart · New York.
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10 MeSH Terms