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Publication Record


Use of Magnets as a Minimally Invasive Approach for Anastomosis in Esophageal Atresia: Long-Term Outcomes.
Slater BJ, Borobia P, Lovvorn HN, Raees MA, Bass KD, Almond S, Hoover JD, Kumar T, Zaritzky M
(2019) J Laparoendosc Adv Surg Tech A 29: 1202-1206
MeSH Terms: Dilatation, Esophageal Atresia, Esophageal Stenosis, Female, Fluoroscopy, Follow-Up Studies, Humans, Infant, Magnets, Male, Radiography, Interventional, Retrospective Studies, Stents, Treatment Outcome
Show Abstract · Added November 30, 2020
The majority of esophageal atresia (EA) patients undergo surgical repair soon after birth. However, factors due to patient characteristics, esophageal length, or surgical complications can limit the ability to obtain esophageal continuity. A number of techniques have been described to treat these patients with "long-gap" EA. Magnets are a nonsurgical alternative for esophageal anastomosis. The purpose of this study was to report long-term outcomes for the use of magnets in EA. Between July 2001 and December 2017, 13 patients underwent placement of a magnetic catheter-based system under fluoroscopic guidance at six institutions. Daily chest radiographs were obtained until there was union of the magnets. Magnets were then removed and replaced with an oro- or nasogastric tube. Complications and outcomes were recorded. The average length of follow-up was 9.3 years (range 1.42-17.75). A total of 85% of the patients had type A, pure EA, and 15% had type C with previous fistula ligation. The average length of time to achieve anastomosis was 6.3 days (range 3-13). No anastomotic leaks occurred, and all of the patients had an expected esophageal stenosis that required dilation given the 10F coupling surface of the magnets (average 9.8, range 3-22). Six patients (46%) had retrievable esophageal stents, and two underwent surgery; yet all maintained their native esophagus without interposition. A total of 92% were on full oral feeds at the time of follow-up. The use of magnets for treatment of long-gap EA is safe and feasible and accomplished good long-term outcomes. The main complication was esophageal stricture, although all patients maintained their native esophagus. A prospective observational study is currently enrolling patients to evaluate the safety and benefit of a catheter-based magnetic device for EA.
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MeSH Terms
Chapurin N, Gelbard A
(2019) N Engl J Med 381: e15
MeSH Terms: Deglutition Disorders, Epiglottitis, Fever, Humans, Male, Middle Aged, Neck, Radiography, Streptococcal Infections, Streptococcus pyogenes, Tracheostomy
Added July 30, 2020
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Sex Hormone-Binding Globulin Levels in Young Men Are Associated With Nonalcoholic Fatty Liver Disease in Midlife.
Sarkar M, VanWagner LB, Terry JG, Carr JJ, Rinella M, Schreiner PJ, Lewis CE, Terrault N, Coronary Artery Risk Development in Young Adults (CARDIA) Cohort
(2019) Am J Gastroenterol 114: 758-763
MeSH Terms: Adult, Biomarkers, Humans, Intra-Abdominal Fat, Male, Middle Aged, Non-alcoholic Fatty Liver Disease, Prevalence, Prospective Studies, Radiography, Abdominal, Risk Factors, Sex Hormone-Binding Globulin, Testosterone, Tomography, X-Ray Computed, United States
Show Abstract · Added April 3, 2019
INTRODUCTION - Cross-sectional data note lower levels of testosterone and sex hormone-binding globulin (SHBG) levels in men with nonalcoholic fatty liver disease (NAFLD). Whether sex hormone levels in young men are predictive of later risk of NAFLD is not known.
METHODS - Among men in the prospective population-based multicenter Coronary Artery Risk Development in Young Adults study (mean age 50; n = 837), we assessed whether testosterone and SHBG levels measured at study year 10 (median age 35 years) were associated with prevalent NAFLD at study year 25. NAFLD was defined using noncontrast abdominal computed tomography (CT) scan after excluding other causes of hepatic steatosis. The association of testosterone and SHBG with prevalent NAFLD was assessed by logistic regression.
RESULTS - Total testosterone levels in young men were inversely associated with subsequent prevalent NAFLD on unadjusted analysis (odds ratio [OR] 0.64, 95% confidence interval 0.53-0.7, P < 0.001), although no longer significant after adjustment for year 10 metabolic covariates as well as change in metabolic covariates from years 10 to 25 (OR 0.99, 95% confidence interval 0.76-1.27). In contrast, there was a significant inverse association of SHBG with prevalent NAFLD, independent of testosterone and metabolic covariates (OR 0.68, OR 0.51-0.92, P = 0.013). On formal mediation testing, visceral adiposity was found to explain ∼41.0% (95% confidence interval 27%-73%) of the association of lower SHBG with prevalent NAFLD.
CONCLUSIONS - Lower levels of SHBG in young men are associated with increase in prevalent NAFLD in middle age, independent of comprehensive metabolic risk factors. SHBG may provide a novel marker of NAFLD risk in young men.
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15 MeSH Terms
Merging Orthovoltage X-Ray Minibeams spare the proximal tissues while producing a solid beam at the target.
Dilmanian FA, Krishnan S, McLaughlin WE, Lukaniec B, Baker JT, Ailawadi S, Hirsch KN, Cattell RF, Roy R, Helfer J, Kruger K, Spuhler K, He Y, Tailor R, Vassantachart A, Heaney DC, Zanzonico P, Gobbert MK, Graf JS, Nassimi JR, Fatemi NN, Schweitzer ME, Bangiyev L, Eley JG
(2019) Sci Rep 9: 1198
MeSH Terms: Brain Neoplasms, Computer Simulation, Gold, Humans, Metal Nanoparticles, Models, Biological, Monte Carlo Method, Radiography, Radiometry, Radiosurgery, Radiotherapy, Radiotherapy Dosage, X-Ray Therapy, X-Rays
Show Abstract · Added March 30, 2020
Conventional radiation therapy of brain tumors often produces cognitive deficits, particularly in children. We investigated the potential efficacy of merging Orthovoltage X-ray Minibeams (OXM). It segments the beam into an array of parallel, thin (~0.3 mm), planar beams, called minibeams, which are known from synchrotron x-ray experiments to spare tissues. Furthermore, the slight divergence of the OXM array make the individual minibeams gradually broaden, thus merging with their neighbors at a given tissue depth to produce a solid beam. In this way the proximal tissues, including the cerebral cortex, can be spared. Here we present experimental results with radiochromic films to characterize the method's dosimetry. Furthermore, we present our Monte Carlo simulation results for physical absorbed dose, and a first-order biologic model to predict tissue tolerance. In particular, a 220-kVp orthovoltage beam provides a 5-fold sharper lateral penumbra than a 6-MV x-ray beam. The method can be implemented in arc-scan, which may include volumetric-modulated arc therapy (VMAT). Finally, OXM's low beam energy makes it ideal for tumor-dose enhancement with contrast agents such as iodine or gold nanoparticles, and its low cost, portability, and small room-shielding requirements make it ideal for use in the low-and-middle-income countries.
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14 MeSH Terms
Self WH, Upchurch CP, Wunderink RG, Waterer GW, Grijalva CG, Edwards KM
(2018) Chest 153: 763-764
MeSH Terms: Community-Acquired Infections, Humans, Pneumonia, Radiography, Tomography, X-Ray Computed
Added July 27, 2018
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5 MeSH Terms
Coronary Artery Calcium Scores and Atherosclerotic Cardiovascular Disease Risk Stratification in Smokers.
Leigh A, McEvoy JW, Garg P, Carr JJ, Sandfort V, Oelsner EC, Budoff M, Herrington D, Yeboah J
(2019) JACC Cardiovasc Imaging 12: 852-861
MeSH Terms: Aged, Aged, 80 and over, Atherosclerosis, Computed Tomography Angiography, Coronary Angiography, Coronary Artery Disease, Early Detection of Cancer, Female, Humans, Incidence, Incidental Findings, Lung Neoplasms, Male, Middle Aged, Plaque, Atherosclerotic, Predictive Value of Tests, Prevalence, Prognosis, Radiography, Thoracic, Risk Assessment, Risk Factors, Smokers, Smoking, Time Factors, United States, Vascular Calcification
Show Abstract · Added January 10, 2020
OBJECTIVES - This study assessed the utility of the pooled cohort equation (PCE) and/or coronary artery calcium (CAC) for atherosclerotic cardiovascular disease (ASCVD) risk assessment in smokers, especially those who were lung cancer screening eligible (LCSE).
BACKGROUND - The U.S. Preventive Services Task Force recommended and the Centers for Medicare & Medicaid Services currently pays for annual screening for lung cancer with low-dose computed tomography scans in a specified group of cigarette smokers. CAC can be obtained from these low-dose scans. The incremental utility of CAC for ASCVD risk stratification remains unclear in this high-risk group.
METHODS - Of 6,814 MESA (Multi-Ethnic Study of Atherosclerosis) participants, 3,356 (49.2% of total cohort) were smokers (2,476 former and 880 current), and 14.3% were LCSE. Kaplan-Meier, Cox proportional hazards, area under the curve, and net reclassification improvement (NRI) analyses were used to assess the association between PCE and/or CAC and incident ASCVD. Incident ASCVD was defined as coronary death, nonfatal myocardial infarction, or fatal or nonfatal stroke.
RESULTS - Smokers had a mean age of 62.1 years, 43.5% were female, and all had a mean of 23.0 pack-years of smoking. The LCSE sample had a mean age of 65.3 years, 39.1% were female, and all had a mean of 56.7 pack-years of smoking. After a mean of 11.1 years of follow-up 13.4% of all smokers and 20.8% of LCSE smokers had ASCVD events; 6.7% of all smokers and 14.2% of LCSE smokers with CAC = 0 had an ASCVD event during the follow-up. One SD increase in the PCE 10-year risk was associated with a 68% increase risk for ASCVD events in all smokers (hazard ratio: 1.68; 95% confidence interval: 1.57 to 1.80) and a 22% increase in risk for ASCVD events in the LCSE smokers (hazard ratio: 1.22; 95% confidence interval: 1.00 to 1.47). CAC was associated with increased ASCVD risk in all smokers and in LCSE smokers in all the Cox models. The C-statistic of the PCE for ASCVD was higher in all smokers compared with LCSE smokers (0.693 vs. 0.545). CAC significantly improved the C-statistics of the PCE in all smokers but not in LCSE smokers. The event and nonevent net reclassification improvements for all smokers and LCSE smokers were 0.018 and -0.126 versus 0.16 and -0.196, respectively.
CONCLUSIONS - In this well-characterized, multiethnic U.S. cohort, CAC was predictive of ASCVD in all smokers and in LCSE smokers but modestly improved discrimination over and beyond the PCE. However, 6.7% of all smokers and 14.2% of LCSE smokers with CAC = 0 had an ASCVD event during follow-up.
Copyright © 2019 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.
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26 MeSH Terms
Effectiveness of β-Lactam Monotherapy vs Macrolide Combination Therapy for Children Hospitalized With Pneumonia.
Williams DJ, Edwards KM, Self WH, Zhu Y, Arnold SR, McCullers JA, Ampofo K, Pavia AT, Anderson EJ, Hicks LA, Bramley AM, Jain S, Grijalva CG
(2017) JAMA Pediatr 171: 1184-1191
MeSH Terms: Adolescent, Anti-Bacterial Agents, Child, Child, Preschool, Community-Acquired Infections, Drug Therapy, Combination, Hospitalization, Humans, Infant, Intensive Care Units, Pediatric, Length of Stay, Macrolides, Patient Readmission, Pneumonia, Bacterial, Propensity Score, Radiography, Treatment Outcome, beta-Lactams
Show Abstract · Added July 27, 2018
Importance - β-Lactam monotherapy and β-lactam plus macrolide combination therapy are both common empirical treatment strategies for children hospitalized with pneumonia, but few studies have evaluated the effectiveness of these 2 treatment approaches.
Objective - To compare the effectiveness of β-lactam monotherapy vs β-lactam plus macrolide combination therapy among a cohort of children hospitalized with pneumonia.
Design, Setting, and Participants - We analyzed data from the Etiology of Pneumonia in the Community Study, a multicenter, prospective, population-based study of community-acquired pneumonia hospitalizations conducted from January 1, 2010, to June 30, 2012, in 3 children's hospitals in Nashville, Tennessee; Memphis, Tennessee; and Salt Lake City, Utah. The study included all children (up to 18 years of age) who were hospitalized with radiographically confirmed pneumonia and who received β-lactam monotherapy or β-lactam plus macrolide combination therapy. Data analysis was completed in April 2017.
Main Outcomes and Measures - We defined the referent as β-lactam monotherapy, including exclusive use of an oral or parenteral second- or third-generation cephalosporin, penicillin, ampicillin, ampicillin-sulbactam, amoxicillin, or amoxicillin-clavulanate. Use of a β-lactam plus an oral or parenteral macrolide (azithromycin or clarithromycin) served as the comparison group. We modeled the association between these groups and patients' length of stay using multivariable Cox proportional hazards regression. Covariates included demographic, clinical, and radiographic variables. We further evaluated length of stay in a cohort matched by propensity to receive combination therapy. Logistic regression was used to evaluate secondary outcomes in the unmatched cohort, including intensive care admission, rehospitalizations, and self-reported recovery at follow-up.
Results - Our study included 1418 children (693 girls and 725 boys) with a median age of 27 months (interquartile range, 12-69 months). This cohort was 60.1% of the 2358 children enrolled in the Etiology of Pneumonia in the Community Study with radiographically confirmed pneumonia in the study period; 1019 (71.9%) received β-lactam monotherapy and 399 (28.1%) received β-lactam plus macrolide combination therapy. In the unmatched cohort, there was no statistically significant difference in length of hospital stay between children receiving β-lactam monotherapy and combination therapy (median, 55 vs 59 hours; adjusted hazard ratio, 0.87; 95% CI, 0.74-1.01). The propensity-matched cohort (n = 560, 39.5%) showed similar results. There were also no significant differences between treatment groups for the secondary outcomes.
Conclusions and Relevance - Empirical macrolide combination therapy conferred no benefit over β-lactam monotherapy for children hospitalized with community-acquired pneumonia. The results of this study elicit questions about the routine empirical use of macrolide combination therapy in this population.
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Novel Airway and Ventilator Management of Tracheobronchial Disruption After Blunt Trauma.
Mehdiratta N, Archer M, Stewart M, Dennis B, Grogan E
(2017) Ann Thorac Surg 104: e359-e361
MeSH Terms: Accidents, Traffic, Bronchi, Bronchoscopy, Combined Modality Therapy, Female, Follow-Up Studies, Humans, Injury Severity Score, Middle Aged, Multiple Trauma, Positive-Pressure Respiration, Radiography, Thoracic, Risk Assessment, Thoracic Injuries, Trachea, Trauma Centers, Treatment Outcome, Wounds, Nonpenetrating
Show Abstract · Added February 3, 2018
Tracheobronchial injuries can be difficult to diagnose and manage, especially in the presence of polytrauma. A 50-year-old woman presented as a Level I trauma activation after being struck by a motor vehicle. Initial evaluation demonstrated intracranial hemorrhage and multiple chest injuries, including multilevel bilateral rib fractures, pneumomediastinum, and concern for tracheobronchial injury. After initial stabilization, bronchoscopy was performed and demonstrated an injury to the carina. We report a novel airway and ventilation strategy in the setting of concomitant tracheobronchial injury after severe blunt chest trauma in which extracorporeal support is contraindicated.
Copyright © 2017 The Society of Thoracic Surgeons. Published by Elsevier Inc. All rights reserved.
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18 MeSH Terms
Variation in Radiologic and Urologic Computed Tomography Interpretation of Urinary Tract Stone Burden: Results From the Registry for Stones of the Kidney and Ureter.
Tzou DT, Isaacson D, Usawachintachit M, Wang ZJ, Taguchi K, Hills NK, Hsi RS, Sherer BA, Reliford-Titus S, Duty B, Harper JD, Sorensen M, Sur RL, Stoller ML, Chi T
(2018) Urology 111: 59-64
MeSH Terms: Diagnostic Techniques, Urological, Female, Humans, Kidney Calculi, Male, Middle Aged, Prospective Studies, Radiography, Registries, Tomography, X-Ray Computed, Ureteral Calculi
Show Abstract · Added January 16, 2018
OBJECTIVE - To compare the measured stone burden recorded between urologists and radiologists, and examine how these differences could potentially impact stone management. As current urologic stone surgery guideline recommendations are based on stone size, accurate stone measurements are crucial to direct appropriate treatment. This study investigated the discrepant interpretation that often exists between urologic surgeons and radiologists' estimation of patient urinary stone burden.
MATERIALS AND METHODS - From November 2015 through August 2016, new patients prospectively enrolled into the Registry for Stones of the Kidney and Ureter (ReSKU) were included if they had computed tomography images available and an accompanying official radiologic report at the time of their urologist provider visit. Stone number and aggregate stone size were compared between the urologic interpretation and the corresponding radiologic reports.
RESULTS - Of 219 patients who met the inclusion criteria, concordance between urologic and radiologic assessment of aggregate stone size was higher for single stone sizing (63%) compared with multiple stones (32%). Statistical significance was found in comparing the mean difference in aggregate stone size for single and multiple stones (P <.01). Over 33% of stone-containing renal units had a radiologic report with an unclear size estimation or size discrepancy that could lead to non-guideline-driven surgical management.
CONCLUSION - Significant variation exists between urologic and radiologic computed tomography interpretations of stone burden. Urologists should personally review patient imaging when considering stone surgical management. A standardized method for measuring and reporting stone parameters is needed among urologists and radiologists.
Copyright © 2017 Elsevier Inc. All rights reserved.
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11 MeSH Terms
Community-Acquired Pneumonia Visualized on CT Scans but Not Chest Radiographs: Pathogens, Severity, and Clinical Outcomes.
Upchurch CP, Grijalva CG, Wunderink RG, Williams DJ, Waterer GW, Anderson EJ, Zhu Y, Hart EM, Carroll F, Bramley AM, Jain S, Edwards KM, Self WH
(2018) Chest 153: 601-610
MeSH Terms: Adult, Aged, Anti-Infective Agents, Community-Acquired Infections, Female, Hospital Mortality, Humans, Length of Stay, Male, Middle Aged, Pneumonia, Prospective Studies, Radiography, Thoracic, Respiration, Artificial, Severity of Illness Index, Tomography, X-Ray Computed, United States
Show Abstract · Added July 27, 2018
BACKGROUND - The clinical significance of pneumonia visualized on CT scan in the setting of a normal chest radiograph is uncertain.
METHODS - In a multicenter prospective surveillance study of adults hospitalized with community-acquired pneumonia (CAP), we compared the presenting clinical features, pathogens present, and outcomes of patients with pneumonia visualized on a CT scan but not on a concurrent chest radiograph (CT-only pneumonia) and those with pneumonia visualized on a chest radiograph. All patients underwent chest radiography; the decision to obtain CT imaging was determined by the treating clinicians. Chest radiographs and CT images were interpreted by study-dedicated thoracic radiologists blinded to the clinical data.
RESULTS - The study population included 2,251 adults with CAP; 2,185 patients (97%) had pneumonia visualized on chest radiography, whereas 66 patients (3%) had pneumonia visualized on CT scan but not on concurrent chest radiography. Overall, these patients with CT-only pneumonia had a clinical profile similar to those with pneumonia visualized on chest radiography, including comorbidities, vital signs, hospital length of stay, prevalence of viral (30% vs 26%) and bacterial (12% vs 14%) pathogens, ICU admission (23% vs 21%), use of mechanical ventilation (6% vs 5%), septic shock (5% vs 4%), and inhospital mortality (0 vs 2%).
CONCLUSIONS - Adults hospitalized with CAP who had radiological evidence of pneumonia on CT scan but not on concurrent chest radiograph had pathogens, disease severity, and outcomes similar to patients who had signs of pneumonia on chest radiography. These findings support using the same management principles for patients with CT-only pneumonia and those with pneumonia seen on chest radiography.
Copyright © 2017 American College of Chest Physicians. All rights reserved.
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17 MeSH Terms