Laboratory Studies
- CBC count: Leukocytosis should raise concerns for possible impending or frank perforation.
- Electrolytes: Disorders of potassium, sodium, calcium, and magnesium may be the underlying cause of the problem. Patients with colonic pseudo-obstruction are commonly dehydrated and frequently exhibit prerenal azotemia or renal insufficiency.
- Liver function profile
Imaging Studies
Plain abdominal films
This is the most useful diagnostic tool for this disorder. Plain and upright abdominal films show a dilated colon, often from the cecum to the splenic flexure and occasionally to the rectum. Haustral markings remain normal. Serial films may be used to follow the clinical course and the response to treatment.
Specific attention to the diameter of the colon is important. If the colonic diameter exceeds 10 cm, decompression of the colon must be considered and expedited. In addition to cecal diameter, the duration of distension also appears to be an important factor in perforation risk, with the risk lowest in patients who undergo decompression within less than 4 days of onset.
CT scan
While a CT scan is not required to establish a diagnosis, it may be helpful in excluding the presence of frank perforation, obstruction, and toxic megacolon.[4]
Other Tests
Gastrografin enema
Gastrografin is water-soluble and has a high osmolarity; therefore, this contrast medium tends to cause a fluid shift into the colon and may subsequently increase colonic motility. A Gastrografin enema may be both diagnostic and therapeutic for this disorder.
Barium enema
Given the nature of pseudo-obstruction, air should not be instilled into the colon if this procedure is performed.
Procedures
Colonoscopy
This examination may be helpful diagnostically and therapeutically.
This single procedure can help exclude an obstructive process and decompress the colon.
This may be technically difficult because of the difficulty in adequately preparing the colon in order to allow good endoscopic visualization.
Ogilvie WH. Large intestine colic due to sympathetic deprivation: a new clinical syndrome. BMJ. 1948;2:671-3.
Saunders MD. Acute colonic pseudo-obstruction. Best Pract Res Clin Gastroenterol. 2007;21(4):671-87. [Medline].
De Giorgio R, Knowles CH. Acute colonic pseudo-obstruction. Br J Surg. Mar 2009;96(3):229-39. [Medline].
Choi JS, Lim JS, Kim H, Choi JY, Kim MJ, Kim NK, et al. Colonic pseudoobstruction: CT findings. AJR Am J Roentgenol. Jun 2008;190(6):1521-6. [Medline].
Edelman DA, Antaki F, Basson MD, et al. Ogilvie syndrome and herpes zoster: case report and review of the literature. J Emerg Med. Mar 26 2009;[Medline].
McNamara R, Mihalakis MJ. Acute colonic pseudo-obstruction: rapid correction with neostigmine in the emergency department. J Emerg Med. Aug 2008;35(2):167-70. [Medline].
Ponec RJ, Saunders MD, Kimmey MB. Neostigmine for the treatment of acute colonic pseudo-obstruction. N Engl J Med. Jul 15 1999;341(3):137-41. [Medline].
O'Dea CJ, Brookes SJ, Wattchow DA. The efficacy of treatment of patients with severe constipation or recurrent pseudo-obstruction with pyridostigmine. Colorectal Dis. Mar 26 2009;[Medline].
Armstrong DN, Ballantyne GH, Modlin IM. Erythromycin for reflex ileus in Ogilvie's syndrome. Lancet. Feb 9 1991;337(8737):378. [Medline].
Bharucha AE, Phillips SF. Megacolon: Acute, Toxic, and Chronic. Curr Treat Options Gastroenterol. Dec 1999;2(6):517-523. [Medline].
Bode WE, Beart RW Jr, Spencer RJ, et al. Colonoscopic decompression for acute pseudoobstruction of the colon (Ogilvie's syndrome). Report of 22 cases and review of the literature. Am J Surg. Feb 1984;147(2):243-5. [Medline].
Camilleri M, Malagelada JR, Abell TL, et al. Effect of six weeks of treatment with cisapride in gastroparesis and intestinal pseudoobstruction. Gastroenterology. Mar 1989;96(3):704-12. [Medline].
Cherta I, Forne M, Quintana S, et al. Prolonged treatment with neostigmine for resolution of acute colonic pseudo-obstruction. Aliment Pharmacol Ther. Jun 1 2006;23(11):1678-9. [Medline].
Datta SN, Stephenson BM, Havard TJ, et al. Acute colonic pseudo-obstruction. Lancet. Mar 13 1993;341(8846):690. [Medline].
Dorudi S, Berry AR, Kettlewell MG. Acute colonic pseudo-obstruction. Br J Surg. Feb 1992;79(2):99-103. [Medline].
Fiorito JJ, Schoen RE, Brandt LJ. Pseudo-obstruction associated with colonic ischemia: successful management with colonoscopic decompression. Am J Gastroenterol. Oct 1991;86(10):1472-6. [Medline].
Geller A, Petersen BT, Gostout CJ. Endoscopic decompression for acute colonic pseudo-obstruction. Gastrointest Endosc. Aug 1996;44(2):144-50. [Medline].
Harig JM, Fumo DE, Loo FD, et al. Treatment of acute nontoxic megacolon during colonoscopy: tube placement versus simple decompression. Gastrointest Endosc. Jan-Feb 1988;34(1):23-7. [Medline].
Jetmore AB, Timmcke AE, Gathright JB Jr, et al. Ogilvie's syndrome: colonoscopic decompression and analysis of predisposing factors. Dis Colon Rectum. Dec 1992;35(12):1135-42. [Medline].
Johnston G, Vitikainen K, Knight R, et al. Changing perspective on gastrointestinal complications in patients undergoing cardiac surgery. Am J Surg. May 1992;163(5):525-9. [Medline].
Laine L. Management of acute colonic pseudo-obstruction. N Engl J Med. Jul 15 1999;341(3):192-3. [Medline].
Longo WE, Vernava AM 3rd. Prokinetic agents for lower gastrointestinal motility disorders. Dis Colon Rectum. Jul 1993;36(7):696-708. [Medline].
Lynch CR, Jones RG, Hilden K, et al. Percutaneous endoscopic cecostomy in adults: a case series. Gastrointest Endosc. Aug 2006;64(2):279-82. [Medline].
McNamara R, Mihalakis MJ. Acute Colonic Pseudo-Obstruction: Rapid Correction With Neostigmine In The Emergency Department.
Mehta R, John A, Nair P, et al. Factors predicting successful outcome following neostigmine therapy in acute colonic pseudo-obstruction: a prospective study. J Gastroenterol Hepatol. Feb 2006;21(2):459-61. [Medline].
Nelson JD, Urban JA, Salsbury TL, et al. Acute colonic pseudo-obstruction (Ogilvie syndrome) after arthroplasty in the lower extremity. J Bone Joint Surg Am. Mar 2006;88(3):604-10. [Medline].
Rovira A, Lopez A, Cambray C, et al. Acute colonic pseudo-obstruction (Ogilvie's syndrome) treated with erythromycin. Intensive Care Med. Jul 1997;23(7):798. [Medline].
Saunders MD, Cappell MS. Endoscopic management of acute colonic pseudo-obstruction. Endoscopy. Aug 2005;37(8):760-3. [Medline].
Saunders MD, Kimmey MB. Acute colonic pseudo-obstruction. Current Perspectives in Gastroenterology. 2000;3:156-62.
[Best Evidence] Sgouros SN, Vlachogiannakos J, Vassiliadis K, et al. Effect of polyethylene glycol electrolyte balanced solution on patients with acute colonic pseudo obstruction after resolution of colonic dilation: a prospective, randomised, placebo controlled trial. Gut. May 2006;55(5):638-42. [Medline].
Shrestha BM, Darby C, Fergusson C, et al. Cytomegalovirus causing acute colonic pseudo-obstruction in a renal transplant recipient. Postgrad Med J. Jul 1996;72(849):429-30. [Medline].
Sloyer AF, Panella VS, Demas BE, et al. Ogilvie's syndrome. Successful management without colonoscopy. Dig Dis Sci. Nov 1988;33(11):1391-6. [Medline].
Stephenson BM, Morgan AR, Drake N, et al. Parasympathomimetic decompression of acute colonic pseudo-obstruction. Lancet. Nov 6 1993;342(8880):1181-2. [Medline].
Stephenson BM, Morgan AR, Salaman JR, et al. Ogilvie's syndrome: a new approach to an old problem. Dis Colon Rectum. Apr 1995;38(4):424-7. [Medline].
Stieger DS, Cantieni R, Frutiger A. Acute colonic pseudoobstruction (Ogilvie's syndrome) in two patients receiving high dose clonidine for delirium tremens. Intensive Care Med. Jul 1997;23(7):780-2. [Medline].
Turegano-Fuentes F, Munoz-Jimenez F, Del Valle-Hernandez E, et al. Early resolution of Ogilvie's syndrome with intravenous neostigmine: a simple, effective treatment. Dis Colon Rectum. Nov 1997;40(11):1353-7. [Medline].
Vanek VW, Al-Salti M. Acute pseudo-obstruction of the colon (Ogilvie's syndrome). An analysis of 400 cases. Dis Colon Rectum. Mar 1986;29(3):203-10. [Medline].
vanSonnenberg E, Varney RR, Casola G, et al. Percutaneous cecostomy for Ogilvie syndrome: laboratory observations and clinical experience. Radiology. Jun 1990;175(3):679-82. [Medline].

