Doctors

Dr. Ramakrishna P. Venugopalan


Designation :
Consultant
Department :
Gastroenterology and Hepatology
Email :
ramakrish19838@aims.amrita.edu
Qualification :
MD, FACP, EACG, AGAF, FASGE, Diplomate ABIM (Gastroenterology)
Awards and Honors
  • 1985 : Fellow, American College of Physicians (FACP).
  • 1985 : Fellow, American College of Gastroenterology (FACG).
  • 1988 : American Writers Association Honorable Mention Award for: Technique in Therapeutic Endoscopy.
  • 1989 : Member, Constitution and Bylaws Committee ASGE.1995 Certificate of Appreciation from the National Center for Advanced Medical Education.
  • 1992 : Co-Chairman, Clinical Practice Review Session, American Gastroenterology Association Annual Meeting.
  • 1991 : Abstract Reviewer, Clinical Practice, AGA.
  • 2000 : Master Endoscopist of the year, ASGE.
  • 2002 : Consumer’s Guide to Top Doctors in America.
  • 2003 : Consumer’s Research Council of America Best Doctors in America.
  • 2004 : Consumer’s Research Council of America Best Doctors in America.
Societies
  • 1981-present : American Gastroenterological Association.
  • 1981-present : American Society for Gastrointestinal Endoscopy.
  • 1982-present : American Medical Association.
  • 1985-present : American College of Physicians.
  • 1986-present : Indian Society of Gastroenterology.
  • 1998-present : Association of Kerala Medical Graduates.
Live Video Demonstration of Therapeutic ERCP Procedures
  • 1989 : Visiting Faculty, International Therapeutic Biliary Endoscopic Course, Mexico City, Mexico.
  • 1989 : Faculty, Therapeutic ERCP IV, Racine, Wisconsin.
  • 1990 : Faculty, Therapeutic ERCP V, Racine, Wisconsin.
  • 1991 : Faculty, Advances in Therapeutic ERCP III for nurses Racine, Wisconsin.
  • 1994 : Faculty, Therapeutic & Diagnostic Pancreaticobiliary Endoscopy, San Francisco, California.
  • 1995 : Faculty & Course Director, Advanced Therapeutic Pancreaticobiliary Endoscopy & EUS.
  • 1996 : Faculty & Course Director, Advanced Therapeutic Pancreaticobiliary Endoscopy & EUS.
Research
  • 1978 : Role of cyclic nucleotide in iron absorption in rabbit ileum.
  • 1980 : Effect of morphine on the motor activities of human sphincter of Oddi.
  • 1981.1993 : Colon Polyps: Prevalence, surveillance and influence on Colon Cancer sponsored by National Cancer Institute.
  • 1991.1993 : GP2 in Chronic Pancreatitis funded by NIH & Harvard Medical School (Freedman S.D.).
  • 1997 : K-ras Mutation in Pancreatic Cancer.
  • 1998 : Pancreatic Brush Cytology.
Reviewer for Journals
  • 1985-present : Gastroenterology.
  • 1985-present : Gastrointestinal Endoscopy.
  • 1995-present : Digestive Diseases & Sciences.
  • 1997-present : Endoscopy.
  • 1997-present : American Journal of Gastroenterology.
  • 1998-present : Journal of Clinical Gastroenterology.
  • 1999 : Digestive Diseases.
Publications
  1. Venu RP, Toouli J, Geenen JE, Stewart ET, Hogan WJ. Migrating common bile duct stones. Dig Dis Sci 1981; 26:949-53.
  2. Venu RP, Geenen JE, Toouli J, Hogan WJ, Kozlov N, Stewart ET. Gallstone dissolution using mono-octanoin infusion through an endoscopically placed nasobiliary catheter. Am J Gastroenterol 1983;77:227-30.
  3. Venu RP, Geenen JE, Toouli J, Stewart ET, Hogan WJ. Endoscopic retrograde cholangiopancreatography in the diagnosis of cholelithiasis in patients with normal gallbladder x-rays and ultrasound studies. JAMA 1983;249:758-61.
  4. Venu RP, Geenen JE, Hogan WJ, Kruidenier J, Stewart ET, Soergel KH. Endoscopic electrosurgical treatment for strictures of GI tract. Gastrointest Endosc 1984;39:97-100.
  5. Geenen JE, Toouli J, Hogan WJ, Dodds WJ, Stewart ET, Mavrelis P, Riedel D, Venu RP. Endoscopic sphincterotomy: follow-up evaluation of effects on the sphincter of Oddi. Gastroenterology 1984;87:754-8.
  6. Venu RP, Geenen JE, Hogan WJ, Dodds WJ, Wilson SW, Stewart ET et al. Role of endoscopic retrograde cholangiopancreatography in the diagnosis and treatment of choledochocele. Gastroenterology 1984; 87: 1144-9.
  7. Johnson GK, Geenen JE, Venu RP. Therapeutic endoscopy. Wisconsin Medical Journal 1984; 83: 23-6.
  8. Venu RP, Geenen JE, Hogan WJ, Johnson GK, Taylor AJ, Stewart ET et al. ERCP & Endoscopic sphincterotomy in patients with situs inversus. Gastrointest Endosc 1985; 31: 338-40.
  9. Venu RP, Geenen JE. Diagnosis and treatment of the diseases of the papilla.Clinics in Gastroenterology 1986; 15: 439-56.
  10. Johnson GK, Geenen JE, Venu RP, Hogan WJ. Endoscopic treatment of biliary duct strictures in sclerosing cholangitis: follow-up assessment of a new approach. Gastrointest Endosc 1987; 33: 9-12.
  11. Allendorph M, Werlin S, Geenen JE, Hogan WJ, Venu RP, Stewart ET et al. Endoscopic retrograde cholangiopancreatography in children. J Pediatr 1987; 110: 206-11.
  12. Venu RP, Geenen JE, Hogan WJ, Johnson GK, Klein K, Stone J. Intraluminal Radiation therapy for biliary tract malignancy-an endoscopic approach. Gastrointest Endosc 1987; 33: 236-8
  13. Satterfield ST, McCarthy JH, Geenen JE, Hogan WJ, Venu RP, Dodds WJ et al Clinical experience in 82 patients with pancreas divisum: Preliminary results of manometry and endoscopic therapy. Pancreas 1987; 3: 248-53
  14. Helm JF, Venu RP, Geenen JE, Hogan WJ, Dodds WJ, Toouli J et al. Effects of morphine on the human sphincter of Oddi. Gut 1998; 29: 1402-7
  15. Venu RP, Geenen JE, Hogan WJ, Stone J, Johnson GK, Soergel KH. Idiopathic Recurrent pancreatitis: an approach to diagnosis and treatment. Dig Dis Sci 1989; 34: 56-60
  16. Geenen JE, Hogan WJ, Toouli J, Dodds WJ, Venu RP. The efficacy of Endoscopic sphincterotomy in post-cholecystectomy patients with sphincter of Oddi dysfunction. New England J Med 1989; 320: 82-7
  17. Johnson GK, Venu RP, Geenen JE. Sclerosing cholangitis-the endoscopic Approach. Endoscopy Review 1989 Nov/Dec; 6-19
  18. Geenen DJ, Geenen JE, Hogan WJ, Schenck J, Venu RP, Johnson GK, Jackson A. Endoscopic therapy for benign bile duct strictures. Gastrointest Endosc 1989; 35: 367-71
  19. Venu RP, Geenen JE, Kini M, Hogan WJ, Payne M, Johnson GK et al. Endoscopic Retrograde Brush Cytology. A new technique. Gastroenterology 1990; 99: 1475-9
  20. Schmalz MJ, Geenen JE, Hogan WJ, Dodds WJ, Venu RP, Johnson GK. Pain on Common bile duct injection during ERCP: Does it indicate sphincter of Oddi dysfunction? Gastrointest Endosc 1990; 36: 458-61
  21. Raddawi HM, Geenen JE, Hogan WJ, Dodds WJ, Venu RP, Johnson GK. Pressure measurements from biliary and pancreatic segments of sphincter of Oddi. Comparison between patients with functional abdominal pain, biliary, or pancreatic disease. Dig Dis Sci 1991; 36: 71-4
  22. Venu RP, Rolny P, Geenen JE, Hogan WJ, Komorowski RA. Ampullary hamartoma: Endoscopic diagnosis and treatment. Gastroenterology 1991; 100: 795-8
  23. Johnson GK, Geenen JE, Venu RP, Smalls MJ, Hogan WJ. Endoscopic Treatment of biliary tract strictures in sclerosing cholangitis: a larger series and recommendations for treatment. Gastrointest Endosc 1991; 37: 38-43
  24. Venu RP, Rolny P, Geenen JE, Hogan WJ, Komorowski RA, Ferstenberg R. Ampullary tumor caused by metastatic renal cell carcinoma. Dig Dis Sci 1991; 36: 376-8
  25. Venu RP, Geenen JE. Overview of endoscopic sphincterotomy for common bile Stone. Gastrointest Endoscopy Clinics of North America 1991; 1: 3-26
  26. Venu RP, Geenen JE, Vos TC. A new guidewire technique for biliary strictures. Gastrointest Endosc 1991; 37: 553-5
  27. Komorowski RA, Beggs BK, Geenen JE, Venu RP. Assessment of ampulla of Vater pathology: an endoscopic approach. Amer J Surg Path 1991; 15: 1188-96
  28. Freedman SD, Sakamoto K & Venu RP. GP 2, The homologue to the renal cast protein uromodulin, is a major component of intraductal plugs in chronic pancreatitis. J Clin Invest 1993; 92: 83-90.
  29. Venu RP. The role of the endoscopist in sphincter of Oddi manometry. Gastroenterol Clin North Am 1993; 3: 67-80.
  30. Manoukian AV, Schmalz MJ, Geenen JE, Hogan WJ, Venu RP, Johnson GK. Endoscopic treatment of laparoscopic cholecystectomy complications.Gastrointest Endosc 1993; 39: 9-14.
  31. Johnson GK, Geenen JE, Venu RP, Schmalz MJ, Hogan WJ. Treatment of non-Extractable common bile duct stones with combination of ursodeoxycholic acid plus endoprostheses. Gastrointest Endosc
  32. Manoukian AV, Schmalz MJ, Geenen JE, Hogan WJ, Venu RP, Johnson GK. The incidence of post-sphincterotomy stenosis in Group II patients with sphincter of Oddi dysfunction. Gastrointest Endosc 1994
  33. Venu RP, Abu-Hammour A, Etzkorn KP, LoGiudice JA. Sphincter of Oddi in health and diseases. Revista De Gastroenterologia De Mexico 1994; 59: 157-64.
  34. Venu RP, Deutsch SF, Rosenthal GM, LoGiudice JA. Endoscopic therapy for Pancreatic disorders. Chicago Medicine 1995; 98:11-30.
  35. Venu RP, Deutsch SF, Laurent L, Rosenthal GM, LoGiudice JA. Absent minor papilla & an unusual drainage system in a patient with pancreas divisum. Gastrointest Endosc 1995; 42: 173-75.
  36. Etzkorn KP, Venu RP, Brown RD, McGuire DE, Abu-Hammour A. Saline Injection needle life sphincterotomy: a preliminary report. Endoscopy 1996;28:360-64.
  37. Etzkorn KP, Vitello JV, Resnick D, McGuire DE, Venu RP, Watkins JL. A new Technique for jejunal tube placement: a marriage of enteroscope & laparoscope.Gastrointest Endosc 1996; 43: 610-14.
  38. McGuire De, Venu RP, Brown RD, Etzkorn KP, Glaws RW, Abu-Hammour A.Brush Cytology for pancreatic carcinoma: an analysis of factors influencing results. Gastrointest Endosc 1996; 44: 300-4.
  39. Abu-Hammour A, Venu RP, Etzkorn KP, Showel JL, Zaytsev PM, Brown RD.Common bile duct obstruction caused by multiple myeloma of the pancreas. Gastrointest Endosc 1996; 44: 606-8.
  40. Venu RP, Brown RD, Rosenthal G, Deutsch SF, LoGiudice JA, Pastika B et al.An impacted metallic clip at the ampulla causing ascending cholangitis.Gastrointest Endosc 1997; 45: 435-36.
  41. Venu RP, Brown RD, McGuire DE. Exfoliative cytology for carcinoma of the Pancreas: a review. Gastroenterology International 1996; 9: 133-38.
  42. Dodda G, Brown RD, O’Neil HK, Venu RP. Cystic duct insertion at the ampulla As a cause for acute recurrent pancreatitis. Gastrointest Endosc 1998; 47: 181-83.
  43. Venu RP, Brown RD. Image of the month. Gastroenterology1998;114:632&863.
  44. Venu RP, Pastika BJ, Kini M, Chua D, Christian R, Schalais J et al. Self-expandable metal stents for malignant gastric outlet obstruction: a modified technique. Endoscopy 1998; 30: 553-58.
  45. Venu RP, Brown RD. Should ERCP be conducted in special circumstances Without fluoroscopy? Contra . Endoscopy 1998; 30:308-10. (Editorial)
  46. Burdick JS, Venu RP, Hogan WJ. Cutting the defiant lower esophageal ring.Gastrointest Endosc
  47. Venu RP, Radke JS, Brown RD, Deutsch SF, Zaystev PM, Miyaji E et al. Autoimmune pancreatitis, pancreatic mass, and lower GI bleed. J Clin Gastroenterology 1999; 28:364-67.
  48. Venu RP, Brown RD, Will M. An unusual technique pseudocyst drainage.Endoscopy 1999; 31:538.
  49. Tiongco FP, Akeneni U, Brown RD, Venu RP. Cystic lesion of the pancreas:Diagnosis and management. Chicago Medicine 1999; 102:26-29.
  50. Venu RP, Brown RD, Marrero JA, Pastika BJ, Frakes JT. Endoscopic Transpapillary drainage of pancreatic abscess: techniques and results. Gastrointest Endosc 1999 (in press).
  51. Regan J, Marrero JA, Malik P, Brown RD, Venu RP. Chronic pancreatitis caused by hyadatid cyst. Gastrointest Endosc 1999; 49:791-93..
  52. Etzkorn KP, Diab FH, McGuire DE, Brown RD, Venu RP. ERCP under general anaesthasia. Indications and Results. Gastrointest Endosc 1997; 44:140-46.
  53. McGuire DE, Venu RP, Abu-Hammour AM, Etzkorn KP, Brown RD.Periampullary Disorders: A review of pathophsysiology. The Gastroenterologist 1995; 3: 20-27.
  54. Alrashid AI, Brown RD, Mihalov ML, Sekosan M, Pastika BJ, Venu RP. Crohn’s disease involving the lung; resolution with inflixmab. Dig Dis Sci 2001; 8:48.
  55. Venu RP, Atia GN, Brown RD, Rosenthal G. Intraductal Papillary Mucinous Tumor of the pancreas: ERCP EUS, Pancreatoscopy findings. Gastrointest Endosc 2002;55:82.
  56. Atia GN, Brown RD, Alrashid AI, Halline AG, Helton S, Venu RP. The role of Pancreatoscopy in pre-operative evaluation of intraductal papillary mucinous tumor of the pancreas. J Clin Gasteroenterology 2002;35(2):175-179.
  57. Moparty RK, Brown RD, Layden TJ, Chirravuri V, Wiley T, Venu RP. Dissolution of blood clots in the biliary ducts with a thrombolytic agent infused through nasobiliary catheter. Gastrointest Endosc 2002;56: 436-438.
  58. Venu RP, Brown RD, Pastika BJ, Erikson LW. The buried bumper syndrome: a simple management approach in two patients. Gastrointest Endosc 2002;56: 582-584.
  59. Venu RP, Brown RD, Halline AG. The Role of ERCP in acute and chronic pancreatitis. J Clin Gastroenterol 2002;34:560-568.
  60. Moxon DR, Hong K, Brown RD, Venu RP. Selective intrahepatic ductal cannulation during ERCP with a sphincterotome. Gastrointest Endosc 2003;57: 738-743.
  61. Chandrashekar L, Brown RD, Venu RP. Management of Dieulafoy’s Lesion in The Endoscopic Era. J Clin Gastroenterol 2003; 36: 1-2. (editorial)
Textbook Chapters
  1. Geenen JE, Venu RP. Endoscopic retrograde cholangiopancreatography. In: Haubrich WS, Calser MH, Roth JL, Sehaffner F, eds. Bockus Gastroenterology. Philadelphia: WB Saunders, 1985; 4:601-611.
  2. Geenen JE, Venu RP, Endoscopy in bile duct obstruction and ampullary Dysfunction. In: Bayless TM, ed. Current Therapy in Gastroenterology and Liver Disease – 2. Philadelphia: B.C. Decker Inc, 1986: 2: 429-33.
  3. Venu RP, Geenen JE. Endoscopic sphincterotomy. In: Waye J, Geenen J, Fleischer D, eds. Techniques in Therapeutic Endoscopy. Philadelphia: WB Saunders, 1987: 5.1-5.22.
  4. Geenen JE, Venu RP. Endoscopic management of biliary tract obstruction. In: Waye J, Geenen J, Fleischer D, eds. Techniques in Therapeutic Endoscopy. Philadelphia: WB Saunders, 1987: 6.1-6.9
  5. Geenen JE, Venu RP. Sphincter of Oddi dysfunction. In: Schiff L, Schiff ER, eds. Disease of the liver. Philadelphia: J.B. Lippincott Co, 1987:2:1427-34.
  6. Venu RP, Geenen, JE. Post cholecystectomy syndrome. In: Yamada T, Alpers, DH, Owyang, C, Powell DW, Silverstein FE, eds. Textbook of Gastroenterology. Philadelphia: J.B. Lippincott Co, 1991:2:2033-44.
  7. Venu RP, Geenen JE, Stone JE, The use of therapeutic endoscopy in the biliary tree. In: Taylor MB, ed. Gastrointestinal Emergencies. Baltimore:Williams & Wilkins, 1992:1:215-225.
  8. Venu RP, Stone JE. Complications of sclerotherapy. In: Taylor MB, ed. Gastrointestinal Emergencies. Baltimore: William & Wilkins, 1992:1:568-573.
  9. Venu RP, Geenen JE. Endoscopic sphincterotomy. In: Waye J, Geenen J,Fleischer D, eds. Techniques in Therapeutic Endoscopy. Philadelphia:WB Saunders, 1992:2:7.1-7.26.10. Geenen JE, Venu RP. Endoscopic management of biliary tract obstruction. In:Waye J, Geenen J, Fleischer D, eds. Technique in Therapeutic Endoscopy. Philadelphia: WB Saunders, 1992:2:8.1-8.28.
  10. Venu RP, Geenen JE. Periampullary region: physiology & pathophysiology. In: Silvis SE, Rohrmann CA, Ansel HJ, eds. Text and Atlas of Endoscopic Retrograde Cholangio Pancreatography. New York: Igaku-Shoin, 1995:1:146-156.
  11. Geenen JE, Venu RP, Sphincter of Oddi dysfunction. In: Schiff L, Schiff ER, eds. Diseases of the Liver. Philadelphia: J.B. Lippincot Co, 1993:
  12. Venu RP, Geenen JE, Hogan WJ. Sphincter of Oddi stenosis/dysfunction. In: Sivak MJ, ed. Gastroenterologic Endoscopy. 1992
  13. Venu RP, Geenen JE. Ampulla: Motility and Stricture. In: Barkin J, O’Phelan CA, eds. Advanced Therapeutic Endoscopy. New York: Raven Press,1994: 2:343-351.
  14. Venu RP, Geenen JE. Ampullary pathology, firming up a diagnosis. In: Barkin SJ, Rogers AI, eds. Difficult Decisions In Digestive Diseases. St. Louis: Mosby, 1994: 2:215-224.
  15. Venu RP, LoGiudice JA, Deutsch SF, Rosenthal GM. Hemorrhoids. In: Bayless, ed. Current Therapy in Gastroenterology in Liver Disease. St. Louis: Mosby, 1994: 4: 431-433.
  16. Venu RP, Brown RD. ERCP in pancreatic disorders. In: Brandt LJ, ed. Clinical Practice of Gastroenterology. Philadelphia: Current Medicine Inc, 1999: 2: 1225-1237.
  17. Brown RD, Malik P, Venu RP. Endoscopic treatment of benign bile duct strictures In: Bhutan M, Tandon eds. Advances in Endoscopy. 1999 (in press)
Abstracts
  1. Juan D, Venu RP. Houssay phenomenon in man secondary to isolated growth hormone efficiency. Clinical Research 1978: 658
  2. Venu RP, Hogan WJ, Geenen JE, Dodds WJ, Helm JF, Arndorfer RC. Complications of gastroesophageal reflux in scleroderma: high risk factors associated with esophageal stricture. Gastrointest Endosc 1979
  3. Bjork JT, Venu RP, Shackman PE, Varma RR. Effect of antibiotic therapy on symptomatic and asymptomatic patients with spontaneous bacterial peritonitis. Gastroenterology 1980; 78: 1324
  4. Venu RP, Geenen JE, Toouli J, Hogan WJ, Stewart ET, Dodds WJ. ERCP findings in patients with biliary like pain and normal gall bladder x-ray and ultrasound studies. Gastrointest Endosc 1981; 27; 134
  5. Kozlov N, Geenen JE, Hogan WJ, Toouli J, Venu RP, Dodds WJ. The treatment of common bile duct stones with mono-octanoin by an endoscopically placed transnasal biliary catheter. Gastrointest Endosc 1981; 27: 135
  6. Mavrelis P, Geenen JE, Hogan WJ, Toouli J, Dodds WJ, Stewart ET, Venu RP. Long term effects of endoscopic sphincterotomy on sphincter of Oddi structure and motor function. Gastroenterology 1981; 5: 1225
  7. Hogan WJ, Geenen JE, Dodds WJ, Toouli J, Venu RP, Helm J. Paradoxical motor response to cholecystokinin in patients with suspected sphincter of Oddi dysfunction. Gastroenterology 1982; 82: 1085
  8. Venu RP, Toouli J, Geenen JE, Hogan WJ, Helm J, Dodds WJ, Arndorfer RC. Effect of morphine on motor activity of the human sphincter of Oddi. Gastroenterology 1983; 84: 1342
  9. Hogan WJ, Geenen JE, Venu RP, Dodds WJ, Helm J, Toouli J. Abnormally rapid phasic contractions of the human sphincter of Oddi (tachyoddia). Gastroenterology 1983; 84: 1189
  10. Hogan WJ, Geenen JE, Kruidenier J, Venu RP, Helm J, Dodds WJ, Wilson SD. Ineffectiveness of conventional sphincteroplasty in relieving pancreatic duct sphincter pressure in patients with idiopathic recurrent pancreatitis. Gastroenterology 1983; 84: 1189
  11. Adler D, Geenen JE, Venu RP, Stewart ET, Hogan WJ, Dodds WJ. Is there a role for endoscopic sphincterotomy in patients with common bile duct stones and an intact gall bladder? Gastrointest Endosc 1983; 29: 190
  12. Auerbach A, Geenen JE, Hogan WJ, Venu RP, Stewart ET, Dodds WJ. Intrahepatic duct stones: a new nonsurgical approach to their treatment. Gastrointest Endosc 1983; 29: 170
  13. Venu RP, Geenen JE, Hogan WJ, Komorowski R, Johnson GK. A prospective study of the endoscopic and histologic effects of mono-octanoin infusion for common bile duct stone dissolution and biliary tract mucosa. Gastrointest Endosc 1984; 30: 138
  14. Allendorph M, Geenen JE, Werlin S, Hogan WJ, Venu RP, Stewart ET. ERCP Examination in children with pancreaticobiliary disease: an evolving role in diagnosis and treatment. Gastrointest Endosc 1984; 30 :139
  15. Geenen JE, Hogan WJ, Toouli J, Dodds WJ, Venu RP. A prospective randomized study of the efficacy of endoscopic sphincterotomy for patients with presumptive sphincter of Oddi dysfunction. Gastroenterology 1984; 86: 1086
  16. Satterfield ST, Geenen JE, Hogan WJ, Venu RP, Dodds WJ, Johnson GK et al. Clinical experience in 82 patients with pancreas divisum; preliminary results of manometry and endoscopic therapy. Gastroenterology 1985; 88: 1572
  17. Venu RP, Geenen JE, Hogan WJ, Stewart ET, Dodds WJ, Johnson GK. Idiopathic recurrent pancreatitis: diagnostic role of ERCP and sphincter of Oddi manometry. Gastrointest Endosc 1985; 31: 141
  18. Johnson GK, Geenen JE, Venu RP, Hogan WJ. Sclerosing cholangitis: treatment with endoscopic sphincterotomy and balloon dilatation. Gastrointest Endosc 1985; 31: 153
  19. Bader M, Geenen JE, Hogan WJ, Dodds WJ, Venu RP, Johnson GK. Endoscopic balloon dilatation of sphincter of Oddi in patients with suspected biliary dyskinesia: results of a prospective randomized trial. Gastrointest Endosc 1986; 32: 158
  20. Schenck J, Geenen JE, Hogan WJ, Dodds WJ, Venu RP, Johnson GK. The efficacy of endoscopic balloon dilatation of postoperative common bile duct strictures-a prospective 3 year study. Gastrointest Endosc 1986; 32: 158
  21. Geenen JE, Hogan WJ, Dodds WJ, Toouli J, Venu RP. Long term results of endoscopic sphincterotomy for treating patients with sphincter of Oddi dysfunction: a prospective studies. Gastrointest Endosc 1987; 92; 1401
  22. Raddawi H, Geenen JE, Hogan WJ, Dodds WJ, Venu RP, Johnson GK. Pressure measurements from the biliary and pancreatic segments of the sphincter of Oddi: comparison between patients with functional, biliary, or pancreatic disease. Gastroenterology 1988; 94: 363
  23. Johnson GK, Geenen JE, Venu RP, Hogan WJ. Endoscopic treatment of symptomatic primary sclerosing cholangitis: is this the next therapeutic choice? Gastrointest Endosc 1989; 35: 165
  24. Venu RP, Prabhu M, Geenen JE, Hogan WJ, Johnson GK, Payne KM. Improved sensitivity in the cytologic diagnosis of cholangiocarcinoma. Gastrointest Endosc 1989; 32: 181
  25. Chung M, Johnson GK, Geenen JE, Venu RP, Hogan WJ. Treatment of large bile duct stones with combination of endoprosthesis and chenodeoxycholic acid. Gastrointest Endosc 1989; 35: 164
  26. Prabhu M, Geenen JE, Hogan WJ, Venu RP, Johnson GK, Dodds WJ. Role of endoscopic stent placement in the treatment of acute recurrent pancreatitis associated with pancreas divisum. Gastrointest Endosc 1989; 35: 165
  27. Venu RP, Rolny P, Geenen JE, Hogan WJ, Johnson GK, Schmalz MJ. Is there a need for multiple stents in Hilar strictures? Gastrointest Endosc 1990; 36: 197
  28. Brown S, Schmalz MJ, Geenen JE, Venu RP, Johnson GK. A comparison of biliary and pancreatic stent occlusion in antibiotic coated vs. conventional stents. Gastrointest Endosc 1990; 36: 206
  29. Rolny P, Geenen JE, Hogan WJ, Venu RP. Clinical features in manometry findings and endoscopic therapy results in group I patients with sphincter of Oddi dysfunction. Gastrointest Endosc 1991; 37: 281-2
  30. Parikh N, Venu RP, Geenen JE, Payne M, Johanson JF, Hogan WJ. Unique ERCP findings of metastatic colon cancer: a comparison with cholangiocarcinoma. Gastrointest Endosc 1991; 37: 257
  31. Schmalz MJ, Johanson JF, Geenen JE, Venu RP, Johnson GK. Migrated biliary and pancreatic stents: complications and techniques for retrieval. Gastrointest Endosc 1991; 37: 252
  32. Johnson GK, Geenen JE, Venu RP, Schmalz MJ, Hogan WJ. Treatment of non-extractable common bile duct stones with combination of ursodeoxycholic acid plus endoprosthesis. Gastrointest Endosc 1991; 37: 253
  33. Venu RP, Geenen JE, Johanson JF, Hogan WJ, Wang W. A modified technique of endoscopic intraluminal radiation therapy (ILRT) for treatment of cholangiocarcinoma: comparison with stent therapy alone. Gastroenterology 1991; 100: 343
  34. Venu RP, Geenen JE, Hogan WJ, Johnson GK, Schmalz MJ. Patients with biliary type pain and a normal appearing gall bladder: where is the problem? Gastroenterology 1992; 102: 336
  35. Freedman SD, Venu RP, Steer ML. GP2, the homologue to the renal cast protein uromodulin, is a component of protein plugs in pancreatic duct. Gastroenterology 1992; 102: 266
  36. Manoukian AV, Schmalz MJ, Geenen JE, Venu RP, Johnson GK. Post-laparoscopic cholecystectomy problems: “minimally invasive” ERCP therapy. Gastrointest Endosc 1992; 38: 250
  37. Venu RP, Hogan WJ, Geenen JE. Cutting the defined ring-a new approach for persistent dysphagia following unsuccessful bougienige. Gastrointest Endosc 1992; 38: 245
  38. Manoukian AV, Schmalz MJ, Geenen JE, Hogan WJ, Venu RP, Johnson GK. Incidence of post-sphincterotomy stenosis in Group II patients with sphincter of Oddi dysfunction. Gastroenterology 1992; 102: 321
  39. Howerton DH, Geenen JE, Hogan WJ, Venu RP, Schmalz MJ, Johnson GK. Does common bile duct diameter influence the risk of post-sphincterotomy complications? Gastrointest Endosc 1993; 39: 315
  40. Carron DA, Geenen JE, Hogan WJ, Venu RP, Johnson GK, Schmalz MJ. Pancreatitis following sphincter of Oddi manometry: a prospective evaluation of possible risk factors. Gastroenterology 1993; 104: 351
  41. Carron DA, Venu RP, Hogan WJ, Geenen JE, Levandowski J. Can percutaneous endoscopic gastrostomy placement be performed safely in outpatients? Gastrointest Endosc 1993; 39: 272
  42. Burdick JS, Geenen JE, Hogan WJ, Schmalz MJ, Bohorfoush A, Venu RP. Pancreatic stent therapy in chronic pancreatitis: which patients benefit? Gastrointest Endosc 1993; 39: 249
  43. Freedman SD, Venu RP. Can pancreatic stent placement lead to chronic pancreatitis. Gastroenterology 1993; 104: 304