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Nutrition and Wellness The food choices that we make everyday affect our well-being and how we feel today or in the future. Dr. Mehdizadeh is board certified by the American Board of Physician Nutrition Specialists. Read the Full Story
Esophagus Cancer Prevention The incidence of esophageal cancer is rising dramatically in the United States with a significant increase among those ages 45-65.  However, with proper screening and careful attention to symptoms, early detection is possible.
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Colon Cancer Prevention Early detection of colon cancer through colonoscopy can save lives.Colonoscopy allows detection and removal of colon polyps before they can develop into colon cancer.
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Shahab Mehdizadeh, M.D., M.A.

Patient Choice 9Dr. Mehdizadeh is board certified in gastroenterology, internal medicine and nutrition.  He obtained his Bachelors and Masters degrees from the University of California Los Angeles (UCLA) with both departmental honors and UCLA college of letters and sciences honors.  He was also awarded the prestigious UCLA Chancellor Service award for his contributions to the University.

He then attended the University of Rochester School of Medicine where he received commendations on his performance on two consecutive years.

He subsequently completed his residency in internal medicine at Cedars-Sinai Medical Center.  He was the recipient of the American Liver Foundation and the AASLD Resident Scholar Award.  Dr. Mehdizadeh then completed three years of specialty training in gastroenterology and liver disorders at the combined UCLA/Cedars-Sinai Medical Center program.

Dr. Mehdizadeh has been involved in numerous research projects and is published in several major journals (see publications). His research focuses on new and advanced endoscopic techniques. He has received a letter of recognition from the Journal of Gastrointestinal Endoscopy for his outstanding publication.  He also received the Senior Fellow Abstract Award and the Best Clinical Research Award by the American College of Gastroenterology.

Dr. Mehdizadeh is board certified in areas of gastroenterology, and diseases of liver.  He treats disorders of the esophagus, stomach, intestines, colon, gallbladder, liver, pancreas, and hemorrhoids. He places particular emphasis on prevention of cancers of the colon and esophagus.

Patient Choice 8Dr. Mehdizadeh greatly values the importance of nutrition in the treatment and prevention of disorders.  He is board certified by the American Board of Physician Nutrition Specialists.  He currently serves as an attending physician for the Metabolic Support Team and is an active member of the Nutrition Advisory Support Committee at Cedars-Sinai Medical Center.

Board Certifications

Diplomat, American Board of Gastroenterology & Hepatology
Diplomat, American Board of Internal Medicine
Diplomat, American Board of Physician Nutrition Specialists


Patient ChoiceEducation

2003-2006 UCLA & Cedars-Sinai Medical Center Combined Programs
                    Gastroenterology and Hepatology Fellowship
2000-2003 Cedars-Sinai Medical Center
                    Internal Medicine Residency
1996-2000 University of Rochester, School of Medicine
1992-1996 University of California, Los Angeles
                    Departmental Scholars Program - combined degrees, 1996:
                         M.A., Microbiology and Molecular Genetics

                         B. S., Biology (summa cum laude)1990-1992

Honors and Awards

2008 Clinical Instructor, UCLA David Geffen School of Medicine
2008 Gastroint. Endosc. letter of recognition, top 30 most highly cited article
2006 American College of Gastroenterology, Senior Fellow Abstract Award
2006 American College of Gastroenterology, Best Clinical Research Award
2001 American Liver Foundation & AASLD Resident Scholar Travel Award
1997 & 1998 Commendation on first and second year basic sciences performance
Summer 1998 International Medicine Fellowship—Spanish Training, Costa Rica
Winter 2000 International Medicine Fellowship—Clinical Neurology in Jagiellonian University, Kraków, Poland
1992-1996 UCLA College of Letters & Sciences honors, Departmental Honors in biology, and the UCLA Chancellor Service Award

Cedars Sinai


Board Certification

Diplomate, American Board of Gastroenterology
Diplomate, American Board of Internal Medicine
Diplomate, American Board of Physician Nutrition Specialists


Organization & Committee Memberships
  • Metabolic Support Team – Cedars-Sinai Medical Center     
    • Team of specialized physicians involved in approving and
    • providing TPN orders for patients in hospital and at home
  • Nutrition Advisory Support Committee – Cedars-Sinai Medical Center    
    • Team of physicians and registered dietitians who oversee
    • nutritional policy and govern the metabolic support team
  • American Gastroenterology Association
  • American College of Gastroenterology


    Mehdizadeh S, Chen GC, Barkodar L, Enayati PJ, Pirouz S, Yadegari M., Ippoliti A, Vasiliauskas EA, Lo SK, Papadakis, KA. Capsule endoscopy in patients with Crohn’s disease: diagnosic yield and safety. Gastrointestinal Endoscopy. 2010;71(1):121-7.

    Mehdizadeh S, Chen G, Enayati PJ, Cheng DW, Han NJ, Shaye OA, Ippoliti A, Vasiliauskas EA, Lo SK, Papadakis KA. Diagnostic yield of capsule endoscopy in ulcerative colitis and inflammatory bowel disease of unclassified type (IBDU). Endoscopy. 2008; Jan; 40(1):30-5.

    Ross A. Mehdizadeh S. Tokar J. Leighton JA. Kamal A. Chen A. Schembre D. Chen G. Binmoeller K. Kozarek R. Waxman I. Dye C. Gerson L. Harrison ME. Haluszka O. Lo S. Semrad C. Digestive Diseases & Sciences. 2008; 53(8):2140-3.

    Mehdizadeh S, Han NJ, Cheng DW, Chan GC, Lo SK. Success rate of retrograde Double-balloon enteroscopy. Gastrointestinal Endoscopy, 2007; 65(4): 633-9.

    Mehdizadeh S, Ross A, Gerson L, Leighton JA, Chen A, Schembre D, Chen, GC, Semrad C, Kamal A, Harrison EM, Binmoeller K, Waxman I, Kozarek R, Lo SK. What is the learning curve associated with double-balloon enteroscopy? Technical details and early experience in 6 U.S. tertiary care centers. Gastrointestinal Endoscopy, 2006; 64(5): 740-50. (Awarded GIE top thirty most highly cited article in 2007)

    Cheng DW. Han NJ. Mehdizadeh S. Lo SK. Intraperitoneal bleeding after oral double-balloon enteroscopy: a case report and review of the literature. Gastrointestinal Endoscopy. 2007; 66(3):627-9.

    Mehdizadeh S, Lo SK. Treatment of small-bowel diaphragm disease using double-balloon enteroscopy. Gastrointestinal Endoscopy, 2006; 64(6): 1014-7.

    Chen GC, Lee-Henderson M, Mehdizadeh S, Goltzer O, Shen J, Sul J, Jutabha R. Novel external sensor array for capsule endoscopy. Endoscopy, 2006; 38(7):752-4.

    Lo SK, Mehdizadeh S. Therapeutic uses of double-balloon enteroscopy. Gastrointest Endosc Clin N Am. 2006; 16(2):363-76.

    Prehn JL, Mehdizadeh S, Landers CJ, Luo X, Cha SC, Wei P, Targan SR. Potential role for TL1A, the new TNF-family member and potent co-stimulator of IFN-γ, in mucosal inflammation. Clinical Immunology. 2004; 112(1):66-77.

    Mehdizadeh S. Costa Rica: Spanish language training program. Journal of University of Rochester Medical Center. 1999; 10:46-48.

    Allayee H, Aouizerat B, Davis R, Drake TA, Gu J, Lusis AJ, Machleder D, Mehdizadeh S, Mehrabian M, Qiao JH, Rook K, Welch C. Genetic Factors in Atherosclerosis. In: Catravas JD, Callow AD, Ryan US, eds. Vascular Endothelium: Pharmacologic and Genetic Manipulations. Plenum Publishing Co, New York; 1998. Series A: Life Sciences, Vol. 294.

    Mehdizadeh S, Warden CH, Wen PZ, Xia YR, Mehrabian M, Lusis AJ. The glutathione peroxidase gene, Gpx1, maps to mouse chromosome 9. Mammalian Genome. 1996; 7(6):465-466.

    Welch CL, Xia YR, Shechter I, Farese R, Mehrabian M, Mehdizadeh S, Warden CH, Lusis AJ. Genetic regulation of cholesterol homeostasis: chromosomal organization of candidate genes. Journal of Lipid Research. 1996; 37(7):1406-1421.



    Modi R, Bucobo JC, Boulay BR, Jamil LH, Lo SK, Mehdizadeh S. Endoscopic Stricturoplasty (ES) is an effective treatment for hepaticojejunostomy anastomotic strictures (HAS). Gastrointestinal Endoscopy. 2010, 71(5):AB170-171.

    Basseri RJ, Bucobo JC, Boulay BR, Mehdizadeh S, Jamil LH, Lo SK. Incidence and imaging characteristics of post-double balloon enteroscopy pancreatitis. Gastrointestinal Endoscopy. 2010, 71(5):AB369.

    Lo, SK, Mehdizadeh S. Estimation of the depth of double balloon enteroscopy (DBE) passage in the small intestine: is it possible to simplify the process? Gastrointest Endosc. 2008, 67(5): AB263. Oral presentation DDW 2008.

    Ibanez, P, Simpson P, Melmed GY, Mehdizadeh S, Sadda M, Lo SK. Capsule endoscopy (CE) re-assessment in a high volume center (HVC) identifies significant misinterpretations of the community gastroenterologists (CG) that may impact clinical care. Gastrointest Endosc. 2008, 67(5): AB91). Oral presentation DDW 2008.

    Cheng D, Han NJ, Mehdizadeh S, Wolin E, Colquhoun S, Nissen N, Lo SK. What are the most useful tools to search for primary gastrointestinal neuroendocrine tumors (PGI-NET)? DDW 2007.

    Mehdizadeh S, Semrad C, Gerson L, Leighton J, Chen A, Schembre D, Ross A, Cheng D, Han J, Kamal A, Harrison E, Binmoeller K, Waxman I, Kozarek R, Lo SK. Factors affecting the success rate of retrograde Double-balloon enteroscopy. ACG 2006 Oral Presentation. Senior Fellow Abstract Award.

    Pasha S, Harrison ME, Lo S, Mehdizadeh S, Semrad C, Ross A, Gerson L, Kozarek R, Schembre D, Binmoeller K, Leighton J. The utility of double-balloon enteroscopy in the diagnosis of small-bowel ulcers: results from a multicenter study. ACG 2006.

    Mehdizadeh S, Ross A, Leighton J, Kamal A, Chen A, Schembre D, Binmoeller K, Kozarek R, Waxman I, Gerson L, Jones B, Semrad C, Lo SK. Double-balloon enteroscopy compared to capsule endoscopy among patients with obscure gastrointestinal bleeding (OGIB): a multicenter U.S. experience. Gastrointest Endosc. 2006; 63(5): AB90. DDW 2006 Oral Presentation. Best Clinical Research Award.

    Ross A, Mehdizadeh S, Tokar J, Leighton J, Kamal A, Chen A, Schembre D, Chen G, Binmoeller K, Gerson L, Kozarek R, Waxman I, Harrison E, Dye C, Haluszka O, Lo SK, Semrad C. Double-balloon enteroscopy for detection of small bowel mass lesions presenting as obscure gastrointestinal bleeding: Do we have a new gold standard? . Gastrointest Endosc. 2006; 63(5): AB159.

    Mehdizadeh S, Sadda M, Lo SK. Mucosectomy-cap assisted ampullectomy (MCAA) is an effective technique in removing residual tissue after snare ampullectomy. . Gastrointest Endosc. 2006; 63(5): AB242.

    Chen G, Goltzer O, Shen J, Chang C, Mehdizadeh S, Sul J, Jutabha R. A novel external lead sensor array placement approach for capsule endoscopy. . Gastrointest Endosc. 2006; 63(5): AB245.

    Schluender S, Mehdizadeh S, Vasiliauskas EA, Dubinsky M, Papadakis KA, Ipoliti A, Lo S, Targan S, Fleshner P. Does preoperative wireless capsule endoscopy predict long-term outcome after ileal pouch-anal anastomosis? Gastroenterology 2006; 130(4, Suppl. 2).

    Lo SK, Ross A, Leighton JA, Gerson L, Chen A, Schembre D, Mehdizadeh S, Jones BH, Semrad C, Kamal A, Binmoeller KF, Kozarek R, Waxman I, Chen GC, Tio TL. Double-balloon enteroscopy: an initial multicenter U.S. experience. Oral presentation ACG 2005. ACG best clinical research award .

    Lo SK, Ross A, Leighton JA, Gerson L, Chen A, Schembre D, Mehdizadeh S, Jones BH, Semrad C, Kamal A, Binmoeller KF, Kozarek R, Waxman I, Chen GC, Tio TL. The first US multi-center study on double-balloon enteroscopy. Oral presentation UEGW 2005.

    Mehdizadeh S, Chen GC, Enayati PJ, Shaye O, De Leon V, Ippoliti A, Lo SK, Papadakis KA. The Diagnostic yield of wireless capsule enteroscopy (WCE) in patients with ulcerative colitis (UC). Gastrointes Endosc. 2005; 61(5):AB175.

    Mehdizadeh S, Chen GC, Enayati P, Shaye O, Lo SK, Papadakis KA. Utility of wireless capsule enteroscopy in evaluating Crohn’s disease patients with abdominal symptoms. Gastrointest Endosc. 2005; 61(5):AB175.

    Lo SK, Mehdizadeh S, Chen GC. Endoscopic stricturoplasty (ES) of hepaticojejunostomy anastomotic strictures (HAS): A novel and effective ERCP Technique. Gastrointest Endosc. 2005; 61(5):AB212.

    Lo SK, Leighton JA, Ross A, Gerson L, Chen A, Schembre D, Mehdizadeh S, Jones BH, Semrad C, Kamal A, Binmoeller KF, Kozarek R, Waxman I, Chen GC, Tio TL. Double-balloon push enteroscopy: Technical details and early experience in 6 U.S. tertiary care centers. Gastrointest Endosc. 2005; 61(5):AB174.

    Shaye O, Yang J, Mehdizadeh S, Ognibene S, Fleshner P, Vasiliauskas E, Papadakis KA, Targan S, Ippoliti A. Efficacy of cyclosporine A in severe ulcerative colitis – a 9-year experience. Gastroenterology. 2005; 128(4, Suppl 2):A-441.

    Ognibene SJ, Vasiliauskas E, Dubinsky M, Ippoliti A, Papadakis KA, Shaye O, Mehdizadeh S, Targan S, Fleshner P. Long term morbidity of cyclosporine A treated patients with ulcerative colitis: a word of caution. Gastroenterology. 2005; 128(4, Suppl 2):A-584.

    Ognibene SJ, Mehdizadeh S, Shaye O, Fleshner PR. Long-term effects of cyclosporine A on morbidity after colectomy for ulcerative colitis: A word of caution. Diseases of Colon and Rectum. 2005; 48 (3): 671-672.

    Prehn J, Mehdizadeh S, Wei P, Targan SR. Novel mechanism of Th1 generation: TNF superfamily molecule, TL1A, markedly amplifies IFNγ production by resting lymphocytes cultured with Il-12 and Il-18 independent of TCR stimulation. Gastroenterology. 2003; 124 (4, Suppl 1): A333.

    Mehdizadeh S, Prehn J, Landers C, Wei P, Targan SR. TLx, a novel TNF-like cytokine, augments IFNγ production from stimulated T cells independently of, but in synergy with, Il12 and Il-18. Gastroenterology. 2002; 122 (4, Suppl): A-147.

    Prehn J, Mehdizadeh S, Lander C, Wei P, Targan SR. Potent augmentation of TH1-IFNγ production by TLx, a novel TNF homologue: Potential role in Crohn’s disease pathogenesis. Gastroenterology. 2002; 122 (4, Suppl): A-35.

    Mehdizadeh S, Stoutenberg A, Ryan C, Shaw-Stiffel T. Racial differences in chronic hepatitis C viral infection in Rochester, NY: liver biopsy correlation with viral load, genotype, and demographics. Hepatology. 2000; Suppl. 626A.


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