JohnDavidHorwhatMDFACG, FASGE

Gastroenterology • Lancaster, PA

Advanced Endoscopic Interventional, Esophagus Disease, Gastrointestinal Cancer, Pancreas Disease

Chief, Division of Gastroenterology, Lancaster General Hospital

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Office
2112 Harrisburg Pike
Suite 202
Lancaster, PA 17601
Phone+1 717-544-3500

Fax+1 717-544-3501
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Education & Training

Duke University HospitalFellowship, Advanced Endoscopy, 2003 - 2004
National Capital ConsortiumFellowship, Gastroenterology, 1997 - 2000
Madigan Army Medical CenterResidency, Internal Medicine, 1992 - 1995
Lewis Katz School of Medicine at Temple UniversityClass of 1992

Certifications & Licensure

PA State Medical License 1994 - 2024
MD State Medical License 2012 - 2014
NE State Medical License 2008 - 2014
ND State Medical License 2010 - 2011
NC State Medical License 2001 - 2008
American Board of Internal Medicine Gastroenterology

Awards, Honors, & Recognition

CMS Meaningful Use Stage 1 Certification EpicCare Ambulatory EMR, Epic Systems Corporation, 2013

Clinical Trials

Endoesophageal Cryotherapy For Ablating Barrett's Esophagus and Early Stage Esophageal Cancer Start of enrollment: 2007 Mar 01
Unknown status
Phase 4

Publications & Presentations

PubMed

18 citations
Clinical outcomes in patients with a diagnosis of "indefinite for dysplasia" in Barrett's esophagus: a multicenter cohort study.
Preetika Sinh, Rajeswari Anaparthy, Patrick E. Young, Srinivas Gaddam, Prashanthi N. Thota, Gokulakrishnan Balasubramanian, Mandeep Singh, April D. Higbee, Sachin Wani...> ;Endoscopy. 2015 Apr 24
65 citations
Persistence of nondysplastic Barrett's esophagus identifies patients at lower risk for esophageal adenocarcinoma: results from a large multicenter cohort.
Srinivas Gaddam, Mandeep Singh, Gokulakrishnan Balasubramanian, Prashanthi N. Thota, Neil Gupta, Sachin Wani, April D. Higbee, Sharad C. Mathur, John D. Horwhat, Amit ...> ;Gastroenterology. 2013 Sep 1
1 citations
Cryotherapy for treatment of radiation proctitis.
Fouad J. Moawad, John D. Horwhat> ;Gastrointestinal Endoscopy. 2014 Feb 1
6 citations
Endotherapy for and tailored approaches to treating GERD, and refractory GERD
G. Richard Locke, John D. Horwhat, Hiroshi Mashimo, Edoardo Savarino, Patrizia Zentilin, Vincenzo Savarino, Frank Zerbib, Steven Armbruster, Roy K. H. Wong, Fouad J. M...> ;Annals of the New York Academy of Sciences. 2013 Oct 1
4 citations
The Dose of Omeprazole Required to Achieve Adequate Intraesophageal Acid Suppression in Patients with Gastroesophageal Junction Specialized Intestinal Metaplasia and B...
Joshua T. Watson, Fouad J. Moawad, G. R. Veerappan, John Bassett, Corinne L. Maydonovitch, John David Horwhat, Roy K H Wong> ;Digestive Diseases and Sciences. 2013 Jul 4
2 citations
Endoscopic Ultrasound-Guided Transesophageal Thoracic Duct Puncture in a Swine Model: A Survival Study
Mohit Girotra, Col John D. Horwhat, Timothy L. Settle, Vinod K. Parasher> ;Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A. 2013 Jun 29
10 citations
Efficacy of cryospray ablation for the treatment of chronic radiation proctitis in a pilot study
Fouad J. Moawad, Corinne L. Maydonovitch, J David Horwhat> ;Digestive Endoscopy. 2013 Mar 1
3 citations
Barrett's esophagus: endoscopic treatments II: Barrett's esophagus: endoscopic treatments II
Michael Saunders, Alejandro Nieponice, Katerina Dvorak, Aaron Goldman, Edgardo Diaz-Cervantes, A. De-la-Torre-Bravo, S. Sobrino-Cossio, E. Torres-Durazo, olimpia marti...> ;Annals of the New York Academy of Sciences. 2011 Sep 1
3 citations
Barrett's esophagus: surveillance and reversal
Christine P.J. Caygill, Katerina Dvorak, George Triadafilopoulos, Valter Nilton Felix, John D. Horwhat, Joo Ha Hwang, Melissa P. Upton, Xingde Li, Sanjay Nandurkar, La...> ;Annals of the New York Academy of Sciences. 2011 Sep 1
3 citations
Barrett's esophagus: endoscopic treatments II.
Bruce D Greenwald, Charles J Lightdale, Julian A Abrams, John D Horwhat, Ram Chuttani, Srinadh Komanduri, Melissa P Upton, Henry D Appelman, Helen M Shields, Nicholas ...> ;Annals of the New York Academy of Sciences. 2011 Sep 1
1 citations
Complications with pneumatic dilation.
Fouad J. Moawad, Corinne L. Maydonovitch, John D. Horwhat, Roy K. H. Wong> ;Clinical Gastroenterology and Hepatology. 2010 Aug 1
14 citations
Broken pancreas, broken heart.
Michael K. Cheezum, Scott L Willis, Sean P Duffy, Fouad J. Moawad, John D. Horwhat, Linda L Huffer, Timothy S. Welch> ;The American Journal of Gastroenterology. 2010 Jan 1
8 citations
Focal or Diffuse "Fullness" of the Pancreas on CT. Usually Benign, but EUS Plus/Minus FNA Is Warranted to Identify Malignancy
John D. Horwhat, Henning Gerke, Ruben Daniel Acosta, Darren Pavey, Paul S. Jowell> ;JOP. 2009 Jan 8
47 citations
A Randomized Comparison of Methylene Blue-Directed Biopsy Versus Conventional Four-Quadrant Biopsy for the Detection of Intestinal Metaplasia and Dysplasia in Patients...
John D. Horwhat, Corinne Maydonovitch, Fernando Ramos, Ramon Colina, Erich M. Gaertner, Hyun Uk Lee, Roy K.H. Wong> ;The American Journal of Gastroenterology. 2008 Mar 1
28 citations
Endoscopic therapy of a splenic abscess: definitive treatment via EUS-guided transgastric drainage
Dong H. Lee, Brooks D. Cash, Craig Womeldorph, John D. Horwhat> ;Gastrointestinal Endoscopy. 2006 Oct 1
139 citations
A randomized comparison of EUS-guided FNA versus CT or US-guided FNA for the evaluation of pancreatic mass lesions
John D. Horwhat, Erik K. Paulson, Kevin McGrath, M. Stanley Branch, John Baillie, Douglas S. Tyler, Theodore N. Pappas, Robert A. Enns, Gail Robuck, Helen L Stiffler, ...> ;Gastrointestinal Endoscopy. 2006 Jun 1
126 citations
Cryoablation of Barrett's esophagus: a pilot study.
Mark H. Johnston, John A. Eastone, John D. Horwhat, Jennifer B. Cartledge, Janice S. Mathews, Jacinda R. Foggy> ;Gastrointestinal Endoscopy. 2005 Dec 1
10 citations
Proximal migration of a 3 French pancreatic stent in a patient with pancreas divisum: suggested technique for successful retrieval.
John D. Horwhat, Paul S. Jowell, Stanley Branch, Leonie Fleishman, Frank G. Gress> ;JOP. 2005 Mar 10
17 citations
Defining the diagnostic algorithm in pancreatic cancer.
John D. Horwhat, Frank G. Gress> ;JOP. 2004 Jul 1
7 citations
Sky blue or murky waters: The diagnostic utility of methylene blue
Roy K. H. Wong, John D. Horwhat, Corinne L. Maydonovitch> ;Gastrointestinal Endoscopy. 2001 Sep 1
14 citations
Bedside videoscopic placement of feeding tubes : Development of fiberoptics through the tube
Kurt W. Grathwohl, Robert V. Gibbons, Thomas A. Dillard, John D. Horwhat, Bernard J. Roth, James W. Thompson, Patrick A. Cambier> ;Critical Care Medicine. 1997 Apr 1
Barrett's esophagus: endoscopic diagnosis.
Ishimura, N., Amano, Y., Appelman, H. D., Penagini, R., Tenca, A., Falk, G. W., Wong, R. K., Gerson, L. B., Ramirez, F. C., Horwhat, J. D., Lightdale, C. J., DeVault, ...> ;Ann N Y Acad Sci. 2011 Sep
An unusual presentation of metastatic esophageal adenocarcinoma presenting as thigh pain.
Norris, W. E., Perry, J. L., Moawad, F. J., Horwhat, J. D.> ;J Gastrointestin Liver Dis. 2009 Sep 01
Safety, tolerability, and efficacy of endoscopic low-pressure liquid nitrogen spray cryotherapy in the esophagus.
Greenwald, B. D., Dumot, J. A., Horwhat, J. D., Lightdale, C. J., Abrams, J. A.> ;Dis Esophagus. 2010 Jan 01
Normalization of intestinal metaplasia in the esophagus and esophagogastric junction: incidence and clinical data.
Horwhat, J. D., Baroni, D., Maydonovitch, C., Osgard, E., Ormseth, E., Rueda-Pedraza, E., Lee, H. J., Hirota, W. K., Wong, R. K.> ;Am J Gastroenterol. 2007 Mar
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