Ziad F. Gellad | Scholars@Duke

Ziad F. Gellad
Associate Professor of Medicine

Dr. Gellad is an associate professor of medicine in the Division of Gastroenterology at Duke University Medical Center and a faculty member of the Duke Clinical Research Institute. He is also a VA Career Development Awardee and holds an appointment in the Health Services Research and Development Center of Innovation at the Durham VA Medical Center. His research focuses on the implementation of systems engineering methods to improve the quality and value of health care delivery with a specific emphasis in colorectal cancer screening.

Dr. Gellad has also received several innovation grants to develop and implement novel information technology platforms to improve the patient and clinician experience. He is also an active contributor to the innovation and entrepreneurship activities within Duke University and co-founder of a health technology startup in Durham.

Dr. Gellad received his MD and MPH degrees from Johns Hopkins University. He completed a residency in internal medicine and a fellowship in gastroenterology at Duke University Medical Center. He is the Director of Quality for the Division of Gastroenterology and Associate vice Chair for Clinical Innovation in the Department of Medicine at Duke University Medical Center. Dr. Gellad is past-chair of the Quality Measures Committee of the American Gastroenterological Association, associate editor for GI & Hepatology News and is on the Board of Editors for Clinical Gastroenterology and Hepatology.

Current Research Interests

Quality and value of healthcare

Healthcare systems engineering and decision analysis

Outcomes research in Colorectal Cancer Screening

Implementation Science

Current Appointments & Affiliations

Associate Professor of Medicine, Medicine, Gastroenterology, Medicine 2019
Member in the Duke Clinical Research Institute, Duke Clinical Research Institute, Institutes and Centers 2011
Core Faculty Member, Duke-Margolis Center for Health Policy, Duke - Margolis Center For Health Policy, Initiatives 2019

Contact Information

2301 Erwin Road, Duke North - DUMC 3703, Durham, NC 27710
2301 Erwin Road, Duke North - DUMC 3703, Durham, NC 27710
ziad.gellad@duke.edu (919) 668-1585
@ZiadGelladMD

Background
Education, Training, & Certifications
- Fellow in Gastroenterology, Medicine, Duke University 2006 - 2009
- Medical Resident, Medicine, Duke University 2003 - 2006
- M.D., Johns Hopkins University 2003
- M.P.H., Johns Hopkins University 2002
Previous Appointments & Affiliations
- Associate Professor of Medicine, Medicine, Gastroenterology, Medicine 2016 - 2019
- Assistant Professor of Medicine, Medicine, Gastroenterology, Medicine 2009 - 2016
Expertise
Subject Headings
Research
Selected Grants
- Duke Training Grant in Digestive Diseases and Nutrition awarded by National Institutes of Health 1988 - 2027
- EFC 13794 awarded by Sanofi US 2016 - 2019
- DRI13940 Study awarded by Sanofi-Aventis Deutschland GmbH 2016 - 2018
Fellowships, Supported Research, & Other Grants
- HSR&D Career Development Award awarded by Department of Veterans Affairs 2015 - 2020
External Relationships
- Higgs Boson Health
- Merck & Co. USA (not assoc'd with Merck KGaA)
- Novo Nordisk
Publications & Artistic Works
Selected Publications
- Academic Articles
  - Venkatraman, Vishal, Elayna P. Kirsch, Emily Luo, Sameer Kunte, Madison Ponder, Ziad F. Gellad, Beiyu Liu, et al. “Outcomes With a Mobile Digital Health Platform for Patients Undergoing Spine Surgery: Retrospective Analysis.” Jmir Perioper Med 5, no. 1 (October 26, 2022): e38690. https://doi.org/10.2196/38690.
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  - Kobe, Elizabeth A., Brian A. Sullivan, Xuejun Qin, Thomas S. Redding, Elizabeth R. Hauser, Ashton N. Madison, Cameron Miller, et al. “Longitudinal assessment of colonoscopy adverse events in the prospective Cooperative Studies Program no. 380 colorectal cancer screening and surveillance cohort.” Gastrointest Endosc 96, no. 3 (September 2022): 553-562.e3. https://doi.org/10.1016/j.gie.2022.04.1343.
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  - Venkatraman, Vishal, Madison Ponder, Ziad F. Gellad, Shivanand P. Lad, Edana Christy, Ryan Plichta, John Kevin Harrison, George Chad Hughes, and Julie Doberne. “Feasibility study of a novel digital health platform for patients undergoing transcatheter aortic valve replacement.” J Card Surg 37, no. 7 (July 2022): 2017–22. https://doi.org/10.1111/jocs.16515.
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  - Gellad, Ziad F. “Practice Management: The Road Taken and the Road Ahead.” Clin Gastroenterol Hepatol 20, no. 6 (June 2022): 1205–8. https://doi.org/10.1016/j.cgh.2022.02.037.
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  - Sullivan, Brian A., Thomas S. Redding, Xuejun Qin, Ziad F. Gellad, Elizabeth R. Hauser, Meghan C. O’Leary, Christina D. Williams, et al. “Ten or More Cumulative Lifetime Adenomas Are Associated with Increased Risk for Advanced Neoplasia and Colorectal Cancer.” Dig Dis Sci 67, no. 6 (June 2022): 2526–34. https://doi.org/10.1007/s10620-021-07069-0.
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  - Sullivan, Brian A., Xuejun Qin, Cameron Miller, Elizabeth R. Hauser, Thomas S. Redding, Ziad F. Gellad, Ashton N. Madison, et al. “Screening Colonoscopy Findings Are Associated With Noncolorectal Cancer Mortality.” Clin Transl Gastroenterol 13, no. 4 (April 1, 2022): e00479. https://doi.org/10.14309/ctg.0000000000000479.
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  - Wegermann, Kara, Julius M. Wilder, Alice Parish, Donna Niedzwiecki, Ziad F. Gellad, Andrew J. Muir, and Yuval A. Patel. “Racial and Socioeconomic Disparities in Utilization of Telehealth in Patients with Liver Disease During COVID-19.” Dig Dis Sci 67, no. 1 (January 2022): 93–99. https://doi.org/10.1007/s10620-021-06842-5.
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  - Gellad, Ziad F. “Issue Highlights.” Clin Gastroenterol Hepatol 19, no. 11 (November 2021): 2223–25. https://doi.org/10.1016/j.cgh.2021.09.010.
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  - Ponder, Madison, Vishal Venkatraman, Lefko Charalambous, Abena A. Ansah-Yeboah, Syed M. Adil, Luis A. Antezana, Rajeev Dharmapurikar, et al. “Mobile Health Application for Patients Undergoing Breast Cancer Surgery: Feasibility Study.” Jco Oncol Pract 17, no. 9 (September 2021): e1344–53. https://doi.org/10.1200/OP.20.01026.
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  - Jawitz, Nicole G., Ziad F. Gellad, Li Lin, Richard K. Wood, and David A. Leiman. “Patient, Physician, and Procedure Characteristics Are Independently Predictive of Polyp Detection Rates in Clinical Practice.” Dig Dis Sci 66, no. 8 (August 2021): 2570–77. https://doi.org/10.1007/s10620-020-06592-w.
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  - Hong, Julian C., Elizabeth R. Hauser, Thomas S. Redding, Kellie J. Sims, Ziad F. Gellad, Meghan C. O’Leary, Terry Hyslop, et al. “Characterizing chronological accumulation of comorbidities in healthy veterans: a computational approach.” Sci Rep 11, no. 1 (April 14, 2021): 8104. https://doi.org/10.1038/s41598-021-85546-2.
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  - Horton, Anthony, Shai Posner, Brian Sullivan, Jennifer Cornejo, Andrea Davis, Monika Fields, Thasha McIntosh, et al. “Esophageal contractile segment impedance from high-resolution impedance manometry correlates with mean nocturnal baseline impedance and acid exposure time from 24-hour pH-impedance monitoring.” Dis Esophagus 33, no. 12 (December 7, 2020). https://doi.org/10.1093/dote/doaa063.
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  - Ponder, Madison, Abena A. Ansah-Yeboah, Lefko T. Charalambous, Syed M. Adil, Vishal Venkatraman, Muhammad Abd-El-Barr, Michael Haglund, et al. “A Smartphone App With a Digital Care Pathway for Patients Undergoing Spine Surgery: Development and Feasibility Study.” Jmir Perioper Med 3, no. 2 (October 16, 2020): e21138. https://doi.org/10.2196/21138.
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  - Gellad, Z. F. “Issue Highlights.” Clinical Gastroenterology and Hepatology 18, no. 11 (October 1, 2020): 2389–92. https://doi.org/10.1016/j.cgh.2020.08.024.
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  - Horton, Anthony, Brian Sullivan, Katie Charles, Thasha McIntosh, Andrea Davis, Ziad Gellad, Rahul Shimpi, C Prakash Gyawali, and Amit Patel. “Esophageal Baseline Impedance From High-resolution Impedance Manometry Correlates With Mean Nocturnal Baseline Impedance From pH-impedance Monitoring.” J Neurogastroenterol Motil 26, no. 4 (September 30, 2020): 455–62. https://doi.org/10.5056/jnm19142.
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  - Leiman, David A., Nicole G. Jawitz, Li Lin, Richard K. Wood, and Ziad F. Gellad. “Terminal ileum intubation is not associated with colonoscopy quality measures.” J Gastroenterol Hepatol 35, no. 9 (September 2020): 1503–8. https://doi.org/10.1111/jgh.14997.
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  - Sullivan, Brian A., Thomas S. Redding, Elizabeth R. Hauser, Ziad F. Gellad, Xuejun Qin, Samir Gupta, Douglas J. Robertson, et al. “High-Risk Adenomas at Screening Colonoscopy Remain Predictive of Future High-Risk Adenomas Despite an Intervening Negative Colonoscopy.” Am J Gastroenterol 115, no. 8 (August 2020): 1275–82. https://doi.org/10.14309/ajg.0000000000000677.
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  - Wosik, Jedrek, Marat Fudim, Blake Cameron, Ziad F. Gellad, Alex Cho, Donna Phinney, Simon Curtis, et al. “Telehealth transformation: COVID-19 and the rise of virtual care.” J Am Med Inform Assoc 27, no. 6 (June 1, 2020): 957–62. https://doi.org/10.1093/jamia/ocaa067.
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  - Lieberman, David, Brian A. Sullivan, Elizabeth R. Hauser, Xuejun Qin, Laura W. Musselwhite, Meghan C. O’Leary, Thomas S. Redding, et al. “Baseline Colonoscopy Findings Associated With 10-Year Outcomes in a Screening Cohort Undergoing Colonoscopy Surveillance.” Gastroenterology 158, no. 4 (March 2020): 862-874.e8. https://doi.org/10.1053/j.gastro.2019.07.052.
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  - Musselwhite, Laura W., Thomas S. Redding, Kellie J. Sims, Meghan C. O’Leary, Elizabeth R. Hauser, Terry Hyslop, Ziad F. Gellad, Brian A. Sullivan, David Lieberman, and Dawn Provenzale. “Advanced neoplasia in Veterans at screening colonoscopy using the National Cancer Institute Risk Assessment Tool.” Bmc Cancer 19, no. 1 (November 12, 2019): 1097. https://doi.org/10.1186/s12885-019-6204-1.
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  - Spechler, Stuart J., John G. Hunter, Karen M. Jones, Robert Lee, Brian R. Smith, Hiroshi Mashimo, Vivian M. Sanchez, et al. “Randomized Trial of Medical versus Surgical Treatment for Refractory Heartburn.” N Engl J Med 381, no. 16 (October 17, 2019): 1513–23. https://doi.org/10.1056/NEJMoa1811424.
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  - Voils, Corrine I., Heather A. King, Carolyn T. Thorpe, Dan V. Blalock, Ian M. Kronish, Bryce B. Reeve, Colleen Boatright, and Ziad F. Gellad. “Content Validity and Reliability of a Self-Report Measure of Medication Nonadherence in Hepatitis C Treatment.” Dig Dis Sci 64, no. 10 (October 2019): 2784–97. https://doi.org/10.1007/s10620-019-05621-7.
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  - Gellad, Z. “Issue Highlights.” Clinical Gastroenterology and Hepatology 17, no. 10 (September 1, 2019): 1921–23. https://doi.org/10.1016/j.cgh.2019.07.003.
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  - Zullig, Leah L., Haresh L. Bhatia, Ziad F. Gellad, Mark Eatherly, Rochelle Henderson, and Hayden B. Bosworth. “Adoption of direct-acting antiviral medications for hepatitis C: a retrospective observational study.” Bmc Health Serv Res 19, no. 1 (July 25, 2019): 521. https://doi.org/10.1186/s12913-019-4349-x.
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  - Finn, Raymond T., Benjamin Lloyd, Yuval A. Patel, James T. Allen, Jennifer Cornejo, Andrea Davis, Thasha McIntosh, et al. “Decreasing Endoscopy No-Shows Using a Lean Improvement Framework.” Clin Gastroenterol Hepatol 17, no. 7 (June 2019): 1224-1227.e3. https://doi.org/10.1016/j.cgh.2019.02.002.
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  - Volk, Michael L., Jessica Mellinger, Meena B. Bansal, Ziad F. Gellad, Mark McClellan, and Fasiha Kanwal. “A Roadmap for Value-Based Payment Models Among Patients With Cirrhosis.” Hepatology 69, no. 3 (March 2019): 1300–1305. https://doi.org/10.1002/hep.30277.
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  - Gellad, Ziad. “Issue Highlights.” Clin Gastroenterol Hepatol 16, no. 10 (October 2018): 1539–40. https://doi.org/10.1016/j.cgh.2018.08.022.
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  - Ding, Xiruo, Ziad F. Gellad, Chad Mather, Pamela Barth, Eric G. Poon, Mark Newman, and Benjamin A. Goldstein. “Designing risk prediction models for ambulatory no-shows across different specialties and clinics.” J Am Med Inform Assoc 25, no. 8 (August 1, 2018): 924–30. https://doi.org/10.1093/jamia/ocy002.
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  - Mull, Hillary J., Ziad F. Gellad, Rajan T. Gupta, Javier A. Valle, Danil V. Makarov, Tyler Silverman, and Westyn Branch-Elliman. “Factors Associated With Emergency Department Visits and Hospital Admissions After Invasive Outpatient Procedures in the Veterans Health Administration.” Jama Surg 153, no. 8 (August 1, 2018): 774–76. https://doi.org/10.1001/jamasurg.2018.0874.
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  - Egberg, Matthew D., Ajay S. Gulati, Ziad F. Gellad, Gil Y. Melmed, and Michael D. Kappelman. “Improving Quality in the Care of Patients with Inflammatory Bowel Diseases.” Inflamm Bowel Dis 24, no. 8 (July 12, 2018): 1660–69. https://doi.org/10.1093/ibd/izy030.
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  - Crockett, Seth D., Sachin Wani, Timothy B. Gardner, Yngve Falck-Ytter, Alan N. Barkun, and Alan N. American Gastroenterological Association Institute Clinical Guidelines Committee. “American Gastroenterological Association Institute Guideline on Initial Management of Acute Pancreatitis.” Gastroenterology 154, no. 4 (March 2018): 1096–1101. https://doi.org/10.1053/j.gastro.2018.01.032.
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  - Gellad, Ziad F. “Issue Highlights.” Clin Gastroenterol Hepatol 15, no. 10 (October 2017): 1483–84. https://doi.org/10.1016/j.cgh.2017.08.013.
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  - Gellad, Ziad F. “Worsened Functional Outcome With HFE Hemochromatosis With Persistently, Elevated Transferrin Saturation During Maintenance Therapy.” Clinical Gastroenterology and Hepatology 15, no. 10 (October 1, 2017): 1484–1484.
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  - Finn, R Thomas, Amanda Boyd, Li Lin, and Ziad F. Gellad. “Bolus Administration of Fentanyl and Midazolam for Colonoscopy Increases Endoscopy Unit Efficiency and Safety Compared With Titrated Sedation.” Clin Gastroenterol Hepatol 15, no. 9 (September 2017): 1419-1426.e2. https://doi.org/10.1016/j.cgh.2017.03.030.
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  - Japinga, Mark, Robert Saunders, Ziad F. Gellad, and Mark McClellan. “The Evolving Payment Reform Landscape: New Opportunities for Gastroenterology Leadership.” Clin Gastroenterol Hepatol 15, no. 9 (September 2017): 1322–25. https://doi.org/10.1016/j.cgh.2017.07.008.
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  - Gellad, Ziad F. “Cultivating Competencies for Value-Based Care.” Clin Gastroenterol Hepatol 15, no. 7 (July 2017): 969–71. https://doi.org/10.1016/j.cgh.2017.03.039.
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  - Day, Theodore Eugene, and Ziad F. Gellad. “The Value of Negative Results in Quality Improvement: A Simulation Perspective.” Am J Med Qual 31, no. 4 (July 2016): 376–78. https://doi.org/10.1177/1062860615609112.
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  - Saini, Sameer D., Megan A. Adams, Joel V. Brill, Neil Gupta, Mariam Naveed, Jonathan A. Rosenberg, and Ziad F. Gellad. “Colorectal Cancer Screening Quality Measures: Beyond Colonoscopy.” Clin Gastroenterol Hepatol 14, no. 5 (May 2016): 644–47. https://doi.org/10.1016/j.cgh.2016.02.023.
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  - Gellad, Ziad F., and Theodore Eugene Day. “What Is Value Stream Mapping, and How Can It Help My Practice?” Am J Gastroenterol 111, no. 4 (April 2016): 447–48. https://doi.org/10.1038/ajg.2016.38.
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  - Partin, Melissa R., Aasma Shaukat, David B. Nelson, Amy Gravely, Sean Nugent, Ziad F. Gellad, and James F. Burgess. “Reply.” Clin Gastroenterol Hepatol 14, no. 3 (March 2016): 486. https://doi.org/10.1016/j.cgh.2015.12.008.
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  - Partin, Melissa R., Amy Gravely, Ziad F. Gellad, Sean Nugent, James F. Burgess, Aasma Shaukat, and David B. Nelson. “Factors Associated With Missed and Cancelled Colonoscopy Appointments at Veterans Health Administration Facilities.” Clin Gastroenterol Hepatol 14, no. 2 (February 2016): 259–67. https://doi.org/10.1016/j.cgh.2015.07.051.
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  - Seidelman, Jessica, Rena Zuo, Krishna Udayakumar, and Ziad F. Gellad. “Caught on Capsule: Iron-deficiency Anemia Due to Hookworm Infection.” Am J Med 129, no. 2 (February 2016): 167–69. https://doi.org/10.1016/j.amjmed.2015.08.004.
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  - Rubenstein, Joel H., David Lieberman, Brian Fennerty, and Ziad F. Gellad. “Measuring the quality of Barrett's esophagus management with measures that are high quality.” Gastroenterology 149, no. 6 (November 2015): 1298–1301. https://doi.org/10.1053/j.gastro.2015.09.006.
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  - Rubenstein, Joel H., Robert Enns, Joel Heidelbaugh, Alan Barkun, and Alan Clinical Guidelines Committee. “American Gastroenterological Association Institute Guideline on the Diagnosis and Management of Lynch Syndrome.” Gastroenterology 149, no. 3 (September 2015): 777–82. https://doi.org/10.1053/j.gastro.2015.07.036.
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  - Mansouraty, Gabriel, and Ziad F. Gellad. “Website Review: Review of patient-oriented websites on hemorrhoids.” Gastroenterology, April 25, 2015. https://doi.org/10.1053/j.gastro.2015.04.029.
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  - Gellad, Ziad F. “Endoscopy unit efficiency.” Gastroenterol Hepatol (N Y) 10, no. 5 (May 2014): 315–17.
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  - Gellad, Ziad F., and Javad Taheri. “Reply: To PMID 23978500.” Clin Gastroenterol Hepatol 12, no. 3 (March 2014): 527. https://doi.org/10.1016/j.cgh.2013.12.003.
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  - Gellad, Ziad F., Corrine I. Voils, Li Lin, and Dawn Provenzale. “Physician perceptions on colonoscopy quality: results of a national survey of gastroenterologists.” Gastroenterol Res Pract 2014 (2014): 510494. https://doi.org/10.1155/2014/510494.
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  - Taheri, J., Z. Gellad, D. Burchfield, and K. Cooper. “Simulation as a guide for systems redesign in gastrointestinal endoscopy: Appointment template redesign.” Proceedings of the 2013 Winter Simulation Conference Simulation: Making Decisions in a Complex World, Wsc 2013, December 1, 2013, 2204–14. https://doi.org/10.1109/WSC.2013.6721597.
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  - Gellad, Ziad F., Cole P. Thompson, and Javad Taheri. “Endoscopy unit efficiency: quality redefined.” Clin Gastroenterol Hepatol 11, no. 9 (September 2013): 1046-1049.e1. https://doi.org/10.1016/j.cgh.2013.06.005.
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  - Gellad, Ziad. “Personalisation of colorectal cancer screening.” Lancet Oncol 14, no. 8 (July 2013): 673–75. https://doi.org/10.1016/S1470-2045(13)70252-3.
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  - Gellad, Ziad F., Corrine I. Voils, Li Lin, and Dawn Provenzale. “Clinical practice variation in the management of diminutive colorectal polyps: results of a national survey of gastroenterologists.” Am J Gastroenterol 108, no. 6 (June 2013): 873–78. https://doi.org/10.1038/ajg.2012.316.
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  - Jackson, George L., Leah L. Zullig, S Yousuf Zafar, Adam A. Powell, Diana L. Ordin, Ziad F. Gellad, David Abbott, James M. Schlosser, Janis Hersh, and Dawn Provenzale. “Using NCCN clinical practice guidelines in oncology to measure the quality of colorectal cancer care in the veterans health administration.” J Natl Compr Canc Netw 11, no. 4 (April 1, 2013): 431–41. https://doi.org/10.6004/jnccn.2013.0058.
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  - Taheri, J., Z. Gellad, D. Burchfield, and K. Cooper. “A simulation study to reduce nurse overtime and improve patient flow time at a hospital endoscopy unit.” Proceedings Winter Simulation Conference, December 1, 2012. https://doi.org/10.1109/WSC.2012.6465136.
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  - Chan, Johanna L., Li Lin, Michael Feiler, Andrew I. Wolf, Diana M. Cardona, and Ziad F. Gellad. “Comparative effectiveness of i-SCAN™ and high-definition white light characterizing small colonic polyps.” World J Gastroenterol 18, no. 41 (November 7, 2012): 5905–11. https://doi.org/10.3748/wjg.v18.i41.5905.
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  - Gellad, Ziad, Dariele Burchfield, Kevin Cooper, and Javad Taheri. “Continuous Nursing Care in GI Endoscopy Improves Nurse and Room Utilization and Decreases Patient Wait Time.” American Journal of Gastroenterology 107 (October 2012): S778–79. https://doi.org/10.14309/00000434-201210001-01911.
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  - Gellad, Ziad F., Shelby D. Reed, and Andrew J. Muir. “Economic evaluation of direct-acting antiviral therapy in chronic hepatitis C.” Antivir Ther 17, no. 6 Pt B (2012): 1189–99. https://doi.org/10.3851/IMP2430.
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  - Gellad, Ziad F., Andrew J. Muir, John G. McHutchison, William Sievert, Ala I. Sharara, Kimberly A. Brown, Robert Flisiak, et al. “Cost-effectiveness of truncated therapy for hepatitis C based on rapid virologic response.” Value Health 15, no. 6 (2012): 876–86. https://doi.org/10.1016/j.jval.2012.06.010.
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  - Gellad, Ziad F., Karen M. Stechuchak, Deborah A. Fisher, Maren K. Olsen, Jennifer R. McDuffie, Truls Ostbye, and William S. Yancy. “Longitudinal adherence to fecal occult blood testing impacts colorectal cancer screening quality.” Am J Gastroenterol 106, no. 6 (June 2011): 1125–34. https://doi.org/10.1038/ajg.2011.11.
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  - Gellad, Ziad F., David G. Weiss, Dennis J. Ahnen, David A. Lieberman, George L. Jackson, and Dawn Provenzale. “Colonoscopy withdrawal time and risk of neoplasia at 5 years: results from VA Cooperative Studies Program 380.” Am J Gastroenterol 105, no. 8 (August 2010): 1746–52. https://doi.org/10.1038/ajg.2010.107.
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  - Jackson, George L., L Douglas Melton, David H. Abbott, Leah L. Zullig, Diana L. Ordin, Steven C. Grambow, Natia S. Hamilton, et al. “Quality of nonmetastatic colorectal cancer care in the Department of Veterans Affairs.” J Clin Oncol 28, no. 19 (July 1, 2010): 3176–81. https://doi.org/10.1200/JCO.2009.26.7948.
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  - Gellad, Ziad F., and Dawn Provenzale. “Colorectal cancer: national and international perspective on the burden of disease and public health impact.” Gastroenterology 138, no. 6 (June 2010): 2177–90. https://doi.org/10.1053/j.gastro.2010.01.056.
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  - Gellad, Z. F., and D. Provenzale. “Reply.” Gastroenterology 139, no. 3 (January 1, 2010): 1065. https://doi.org/10.1053/j.gastro.2010.07.037.
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  - Gellad, Ziad F., Daniel Almirall, Dawn Provenzale, and Deborah A. Fisher. “Time from positive screening fecal occult blood test to colonoscopy and risk of neoplasia.” Dig Dis Sci 54, no. 11 (November 2009): 2497–2502. https://doi.org/10.1007/s10620-008-0653-8.
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  - Gellad, Z. F., D. Hampton, C. L. Tebbit, L. Puscas, and D. A. Pavey. “Bilateral vocal cord paralysis following stent placement for proximal esophageal stricture.” Endoscopy 40 Suppl 2 (September 2008): E150. https://doi.org/10.1055/s-2007-995773.
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  - Gellad, Ziad F., Daniel Almirall, Dawn Provenzale, and Deborah A. Fisher. “Time from positive screening fecal occult blood test to colonoscopy and risk of neoplasia.” Gastroenterology 134, no. 4 (April 1, 2008): A151–52.
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  - Gellad, Z. F., B. D. Alexander, J. K. Liu, B. C. Griffith, A. M. Meyer, J. L. Johnson, and A. J. Muir. “Severity of Clostridium difficile-associated diarrhea in solid organ transplant patients.” Transpl Infect Dis 9, no. 4 (December 2007): 276–80. https://doi.org/10.1111/j.1399-3062.2007.00255.x.
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  - Gellad, Ziad F., and Kenneth W. Lyles. “Direct-to-consumer advertising of pharmaceuticals.” Am J Med 120, no. 6 (June 2007): 475–80. https://doi.org/10.1016/j.amjmed.2006.09.030.
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  - Keyl, H. van der, Z. F. Gellad, and J. A. Owen. “Disparity in the kinetics of onset of hypermutation in immunoglobulin heavy and light chains.” Immunol Cell Biol 78, no. 3 (June 2000): 224–37. https://doi.org/10.1046/j.1440-1711.2000.00903.x.
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  - Owen, J. A., H. van der Keyl, and Z. Gellad. “Disparity between the time of onset of heavy and light chain hypermutation.” Faseb Journal 13, no. 5 (March 15, 1999): A990–A990.
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- Conference Papers
  - Chung, Shang L., Ziad F. Gellad, and David A. Leiman. “ADHERENCE TO SURVEILLANCE RECOMMENDATIONS FOR NON-DYSPLASTIC BARRETT'S ESOPHAGUS IS INDEPENDENT OF PATIENT CHARACTERISTICS WITH EXCEPTION OF PATIENT COMORBIDITIES.” In Gastrointestinal Endoscopy, 95:AB360–61, 2022.
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  - Jain, Sukrit, Madison Ponder, Donna Niedzwiecki, Alice Parish, and Ziad F. Gellad. “DIGITAL HEALTH INTERVENTION DECREASES NO-SHOWS FOR ENDOSCOPIC PROCEDURES.” In Gastrointestinal Endoscopy, 95:AB87–88, 2022.
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  - Horton, Anthony J., Shai Posner, Andrea Davis, Monika Fields, Ziad F. Gellad, Rahul A. Shimpi, Ami Y. Patel, C Prakash Gyawali, and Amit Patel. “ELEVATED ESOPHAGEAL CONTRACTILE SEGMENT IMPEDANCE (CSI) FROM HIGH RESOLUTION IMPEDANCE MANOMETRY (HRIM) MAY OBVIATE THE NEED FOR AMBULATORY REFLUX MONITORING IN PATIENTS WITH TYPICAL REFLUX SYMPTOMS.” In Gastroenterology, 160:S162–S162, 2021.
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  - Kobe, Elizabeth A., Brian Sullivan, Xuejun Qin, Thomas S. Redding, Elizabeth R. Hauser, Ashton Madison, Cameron Miller, et al. “PRIOR COMPLICATIONS DURING LONGITUDINAL COLORECTAL CANCER SCREENING AND SURVEILLANCE ARE ASSOCIATED WITH INCREASED COMPLICATION RISK AT FOLLOW-UP COLONOSCOPY.” In Gastroenterology, 160:S31–32, 2021.
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  - Plichta, Jennifer K., Li Lin, Madison Ponder, Bryce B. Reeve, Rajeev Dharmapurikar, Shivanand P. Lad, Ziad F. Gellad, and E Shelley Hwang. “Improving the Patient Experience for Women Undergoing Breast Surgery: Yes, There's an App for That, Too!.” In Annals of Surgical Oncology, 28:S364–65, 2021.
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  - Sullivan, Brian A., Xuejun Qin, Thomas S. Redding, Ziad F. Gellad, Anjanette Stone, David Weiss, Ashton N. Madison, et al. “Genetic Colorectal Cancer and Adenoma Risk Variants Are Associated with Increasing Cumulative Adenoma Counts.” In Cancer Epidemiol Biomarkers Prev, 29:2269–76, 2020. https://doi.org/10.1158/1055-9965.EPI-20-0465.
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  - Miller, Cameron, Xuejun Qin, Brian Sullivan, Elizabeth R. Hauser, Thomas S. Redding, Ziad F. Gellad, David Weiss, et al. “THE ASSOCIATION OF MODIFIABLE RISK FACTORS WITH A DIAGNOSIS OF ADVANCED NEOPLASIA AMONG AN ASYMPTOMATIC VETERAN POPULATION.” In Gastroenterology, 158:S757–S757, 2020.
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  - Sullivan, Brian, Xuejun Qin, Cameron Miller, Elizabeth R. Hauser, Thomas S. Redding, David Weiss, Ashton Madison, et al. “SCREENING AND SURVEILLANCE COLONOSCOPY FINDINGS ARE ASSOCIATED WITH ALL-CAUSE MORTALITY.” In Gastroenterology, 158:S219–S219, 2020.
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  - Wegermann, Kara, Julius Wilder, Alice Parish, Donna Niedzwiecki, Ziad F. Gellad, Andrew Joseph Muir, and Yuval Patel. “BLACK, OLDER, UNMARRIED, AND MEDICAID PATIENTS WERE LESS LIKELY TO COMPLETE HEPATOLOGY VIDEO VISITS DURING COVID-19.” In Hepatology, 72:382A-383A, 2020.
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  - Hong, Julian C., Elizabeth R. Hauser, Thomas S. Redding, Kellie J. Sims, Ziad F. Gellad, Meghan O’Leary, Ashton Madison, et al. “Characterization of temporal relationships of comorbidities developed following cancer diagnoses in veterans.” In Journal of Clinical Oncology, 37:e18049–e18049. American Society of Clinical Oncology (ASCO), 2019. https://doi.org/10.1200/jco.2019.37.15_suppl.e18049.
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  - Leiman, David A., Richard K. Wood, Kimberley J. Evans, Rahul A. Shimpi, and Ziad F. Gellad. “A NOVEL ELECTRONIC MEDICAL RECORD-BASED WORKFLOW FOR DOCUMENTING AND REPORTING QUALITY OF CARE DELIVERY IN BARRETT'S ESOPHAGUS AND UPPER ENDOSCOPY CARE UTILIZATION.” In Gastroenterology, 156:S265–66. W B SAUNDERS CO-ELSEVIER INC, 2019.
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  - Sauer, Bryan G., Sierra R. Lee, Anne G. Tuskey, Anagha Suchitra, Luis Antezana, Ziad F. Gellad, and James M. Scheiman. “MOBILE APPLICATION USE IMPROVES NO-SHOW RATES AND COLONOSCOPY PREPARATION.” In Gastroenterology, 156:S264–65. W B SAUNDERS CO-ELSEVIER INC, 2019.
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  - Zhang, Cecelia, Lauren L. Donnangelo, Stephanie Garbarino, and Ziad F. Gellad. “REDUCING INAPPROPRIATE FECAL IMMUNOHISTOCHEMICAL TEST (FIT) UTILIZATION AT THE DURHAM VETERANS ADMINISTRATION MEDICAL CENTER.” In Gastroenterology, 156:S146–S146. W B SAUNDERS CO-ELSEVIER INC, 2019.
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  - Horton, Anthony J., Brian Sullivan, Katie Charles, Thasha McIntosh, Andrea Davis, Ziad F. Gellad, Rahul A. Shimpi, Prakash Gyawali, and Amit Patel. “ESOPHAGEAL BASELINE IMPEDANCE FROM HIGH RESOLUTION IMPEDANCE MANOMETRY (BI-HRIM) CORRELATES WITH MEAN NOCTURNAL BASELINE IMPEDANCE (MNBI) REGARDLESS OF MANOMETRY SYSTEM MANUFACTURER.” In Gastroenterology, 156:S972–73. W B SAUNDERS CO-ELSEVIER INC, 2019.
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  - Jawitz, Nicole G., David A. Leiman, Li Lin, Richard Wood, and Ziad F. Gellad. “Patient Factors Are More Important Than Physician Factors in Predicting Likelihood of Adenoma Detection.” In American Journal of Gastroenterology, 113:S164–S164. NATURE PUBLISHING GROUP, 2018.
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  - Finn, Raymond T., Benjamin Lloyd, Yuval Patel, James T. Allen, Nicholas Burr, Jennifer Cornejo, Andrea Davis, et al. “Improving Endoscopy Access for Veterans: A Lean Performance Improvement Project Decreases Endoscopy No-Show Rate at a Veterans Affairs Hospital.” In Gastroenterology, 155:e34–35. Elsevier BV, 2018. https://doi.org/10.1053/j.gastro.2018.06.061.
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  - Finn, Raymond T., Benjamin Lloyd, Yuval A. Patel, Jennifer Cornejo, Thasha McIntosh, James Allen, Andrea Davis, et al. “IMPROVING ENDOSCOPY ACCESS FOR VETERANS: A LEAN PERFORMANCE IMPROVEMENT PROJECT DECREASES ENDOSCOPY NO-SHOW RATE AT A VETERANS AFFAIRS HOSPITAL.” In Gastroenterology, 154:S139–S139. W B SAUNDERS CO-ELSEVIER INC, 2018.
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  - Leiman, David A., Nicole G. Jawitz, Li Lin, Richard K. Wood, and Ziad F. Gellad. “TERMINAL ILEUM INTUBATION DOES NOT IMPROVE ADENOMA DETECTION RATE.” In Gastroenterology, 154:S341–S341. W B SAUNDERS CO-ELSEVIER INC, 2018.
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  - Qin, Xuejun, Elizabeth R. Hauser, Annjanette Stone, Weleetka C. Carter, Kellie Sims, R. L. Whitley, Ashton Madison, et al. “GENETIC ASSOCIATION ANALYSIS OF ADVANCED NEOPLASIA IN A COLON CANCER SCREENING COHORT.” In Gastroenterology, 154:S277–S277. W B SAUNDERS CO-ELSEVIER INC, 2018.
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  - Spechler, Stuart J., Robert H. Lee, Brian R. Smith, Hiroshi Mashimo, Vivian Sanchez, Kerry B. Dunbar, Pham Thai, et al. “A VA COOPERATIVE, RANDOMIZED TRIAL OF MEDICAL AND SURGICAL TREATMENTS FOR PATIENTS WITH HEARTBURN THAT IS REFRACTORY TO PROTON PUMP INHIBITORS.” In Gastroenterology, 154:S129–S129. W B SAUNDERS CO-ELSEVIER INC, 2018.
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  - Spechler, Stuart J., Robert H. Lee, Brian R. Smith, Hiroshi Mashimo, Vivian Sanchez, Kerry B. Dunbar, Pham Thai, et al. “CHARACTERIZATION OF CONDITIONS UNDERLYING HEARTBURN REFRACTORY TO PROTON PUMP INHIBITORS ( PPIS) IN A VA COOPERATIVE STUDY OF MEDICAL AND SURGICAL TREATMENTS FOR PPI- REFRACTORY HEARTBURN.” In Gastroenterology, 154:S101–2. W B SAUNDERS CO-ELSEVIER INC, 2018.
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  - Sullivan, Brian, Thomas S. Redding, Elizabeth R. Hauser, Ziad F. Gellad, Xuejun Qin, Samir Gupta, Douglas J. Robertson, et al. “HIGH RISK ADENOMAS AT BASELINE COLONOSCOPY ASSOCIATED WITH FUTURE ADVANCED ADENOMA DESPITE AN INTERVENING NEGATIVE COLONOSCOPY.” In Gastroenterology, 154:S29–S29. W B SAUNDERS CO-ELSEVIER INC, 2018.
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  - Voils, Corrine, Heather King, Daniel Blalock, Carolyn T. Thorpe, Ian Kronish, Bryce Reeve, Christine M. Hunt, Colleen Boatright, Jamiyla Bolton, and Ziad F. Gellad. “CHARACTERIZING ADHERENCE TO DIRECT-ACTING ANTIVIRAL TREATMENT FOR HEPATITIS C INFECTION.” In Gastroenterology, 154:S1228–S1228. W B SAUNDERS CO-ELSEVIER INC, 2018.
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  - Charles, Katie, Brian Sullivan, Thasha McIntosh, Ziad F. Gellad, Rahul A. Shimpi, C Prakash Gyawali, and Amit Patel. “ESOPHAGEAL BASELINE IMPEDANCE FROM HIGH-RESOLUTION IMPEDANCE MANOMETRY (BI-HRIM) CORRELATES WITH MEAN NOCTURNAL BASELINE IMPEDANCE (MNBI) FROM PH-IMPEDANCE MONITORING ON AND OFF PROTON PUMP INHIBITOR THERAPY.” In Gastroenterology, 154:S486–S486. W B SAUNDERS CO-ELSEVIER INC, 2018.
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  - Hong, Julian C., Elizabeth Hauser, Thomas S. Redding, Kellie Sims, Ziad Gellad, Meghan O’Leary, Terry Hyslop, et al. “Network analysis of chronological relationships of comorbidities in veterans from a prospective screening colonoscopy trial.” In Amia. AMIA, 2018.
  - Gellad, Ziad, David Chermak, Emmanuel Brown, and Javad Taheri. “Automating Endoscopy Unit Efficiency Metrics: Leveraging the Electronic Health Record for Process Improvement.” In Gastrointestinal Endoscopy, 81:AB236–AB236. MOSBY-ELSEVIER, 2015.
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  - Gellad, Ziad, Dariele Burchfield, Kevin Cooper, and Javad Taheri. “Impact of Propofol on Endoscopy Unit Efficiency: A Discrete Event Simulation Model.” In American Journal of Gastroenterology, 108:S593–S593. Ovid Technologies (Wolters Kluwer Health), 2013. https://doi.org/10.14309/00000434-201310001-01955.
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  - Gellad, Ziad F., Javad Taheri, Dariele Burchfield, Kevin Cooper, Sarah Lothrop, and Firas H. AL-Kawas. “Discrete Event Simulation Modeling: A Valuable Tool to Optimize Endoscopy Unit Efficiency.” In Gastrointestinal Endoscopy, 75:273–74. MOSBY-ELSEVIER, 2012.
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  - Gellad, Ziad F., Susanna Naggie, Shelby D. Reed, Paul J. Clark, Alex J. Thompson, Kevin A. Schulman, and Andrew J. Muir. “THE COST-EFFECTIVENESS OF A TELAPREVIR-INCLUSIVE REGIMEN AS INITIAL THERAPY FOR GENOTYPE 1 HEPATITIS C INFECTION IN INDIVIDUALS WITH THE CC IL-28B POLYMORPHISM.” In Hepatology, 54:417A-418A. WILEY-BLACKWELL, 2011.
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  - Gellad, Ziad F., Shelby Reed, Andrew J. Muir, John McHutchison, William Steven, Ala I. Sharara, Kimberly Ann A. Brown, et al. “Truncated Therapy Based on Rapid Virologic Response is a Cost Effective Treatment Paradigm for Chronic Hepatitis C.” In Gastroenterology, 140:S895–S895. W B SAUNDERS CO-ELSEVIER INC, 2011.
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  - Gellad, Ziad F., Karen M. Stechuchak, Deborah A. Fisher, Maren K. Olsen, Jennifer R. McDuffie, Truls Ostbye, and William S. Yancy. “Low Adherence to Fecal Occult Blood Testing Over Time: Why Cross-Sectional Performance Measures May Overestimate Colorectal Cancer Screening Rates.” In Gastroenterology, 138:S151–S151. W B SAUNDERS CO-ELSEVIER INC, 2010.
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- Preprints
  - Ponder, Madison, Abena A. Ansah-Yeboah, Lefko T. Charalambous, Syed M. Adil, Vishal Venkatraman, Muhammad Abd-El-Barr, Michael Haglund, et al. “A Smartphone App With a Digital Care Pathway for Patients Undergoing Spine Surgery: Development and Feasibility Study (Preprint).” JMIR Publications Inc., June 13, 2020. https://doi.org/10.2196/preprints.21138.
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Scholarly, Clinical, & Service Activities
Service to the Profession
- Chair, Quality Measures Committee. American Gastroenterological Association. 2014 - 2017 2014 - 2017
Academic & Administrative Activities
- 2017 -              Associate vice Chair for Clinical Innovation, Department of Medicine
  
  2016 -              Duke Connected Care (ACO) Operating Committee
  
  2014 -             Director of Quality, Division of Gastroenterology
  
  2014 - 2017      Director of Clinical Improvement, Department of Medicine
  
  2014 - 2017      Chair, Management of Information Committee, Durham VA Medical Center
  
  2013 - 2014      Project Lead, Enterprise Wide Planning, Duke Medicine
  
  2012 - 2013      Faculty Lead, Duke Institute for Health Innovation Planning Committee

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Education, Training, & Certifications

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Fellowships, Supported Research, & Other Grants

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Selected Publications

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Preprints

Service to the Profession

Academic & Administrative Activities