Introduction
Background
Ogilvie syndrome, or acute colonic pseudo-obstruction (ACPO), is a clinical disorder with the signs, symptoms, and radiographic appearance of an acute large bowel obstruction with no evidence of distal colonic obstruction. The colon may become massively dilated; if not decompressed, the patient risks perforation, peritonitis, and death.
In 1948, Ogilvie described 2 patients with metastatic cancer and retroperitoneal spread to the celiac plexus. The patients also had signs and symptoms of colonic obstruction but with no evidence of organic obstruction to the intestinal flow. Ogilvie hypothesized that the etiology of their conditions was an imbalance in the autonomic nervous system with sympathetic deprivation to the colon, leading to unopposed parasympathetic tone and regional contraction, with resulting functional obstruction.
In 1958, Dudley et al used the term pseudo-obstruction to describe the clinical appearance of a mechanical obstruction with no evidence of organic disease during laparotomy.
Pathophysiology
The pathophysiology of Ogilvie syndrome is not clearly understood. Research into the neurophysiology of the colon reveals that Ogilvie's hypothesis was close to the proposed current understanding. The parasympathetic nervous system promotes gut motility. The vagus nerve supplies the parasympathetic tone from the upper GI tract to the splenic flexure, and the sacral parasympathetic nerves (S2 to S5) supply the left colon and the rectum. Sympathetic stimuli result in the inhibition of bowel motility and the contraction of sphincters. The lower 6 thoracic segments supply the sympathetic tone to the right colon, while lumbar segments 1-3 supply the left colon.
An imbalance in the autonomic innervation appears to lead to a functional bowel obstruction, as supported by pharmacologic and spinal blockade studies, metabolic abnormalities, and retroperitoneal trauma. Unlike Ogilvie's hypothesis, some current evidence suggests that an interruption of the sacral parasympathetic nerves occurs, leading to an adynamic distal colon that is similar to Hirschsprung disease, except with normal ganglion cells observable on autopsy. Other research supports the belief that the sympathetic tone increases in these patients, who are usually very ill, leading to inhibition of colonic motility.
The cecum is the usual site of the largest dilatation in patients with Ogilvie syndrome and, thus, is more prone to the risk of perforation. The Laplace law indicates that the intraluminal pressure needed to stretch the wall of a hollow tube is inversely proportional to its diameter. The cecum, with its larger diameter, requires the smallest amount of pressure to increase in size and in wall tension. As the wall tension of the colon increases, ischemia with longitudinal splitting of the serosa, herniation of the mucosa, and perforation can occur.
Frequency
United States
The frequency has not been established.
International
This rare clinical condition makes it difficult to gather solid epidemiological studies, particularly in regard to its frequency.
Mortality/Morbidity
Mortality rates of 15-50% have been reported; however, with increased awareness, better diagnostic tools, and prompt management of this disorder, mortality rates have decreased. The risk of perforation is higher with a larger cecal diameter. Generally, the overall medical status of patients with Ogilvie syndrome is poor. The prognosis in patients successfully treated for this disorder is directly related to the severity of the co-occurring medical conditions.
Race
No data suggest a different frequency according to race.
Sex
No convincing data suggest a different frequency according to sex; however, some researchers suggest that this illness may have a slight male predominance, possibly by a ratio of 1.5:1.
Age
Ogilvie syndrome is generally a disease of elderly patients, usually older than 60 years; however, this disorder may occur in younger patients, particularly those with underlying spinal cord disorders.
Clinical
History
Patients with Ogilvie syndrome present with abdominal distention and generally have obstipation. Up to 40% may have a recent history of flatus or passage of stool. Presenting symptoms are as follows:
- Abdominal pain (80%)
- Nausea and vomiting (80%)
- Obstipation (40%)
- Fever (37%)
Physical
- Abdominal distention (90-100%)
- Abdominal tenderness (64%)
- Bowel sounds
- Normal or hyperactive (40%)
- Hypoactive, high pitched, or absent (60%)
Causes
Ogilvie syndrome usually occurs in a setting of a recent serious medical illness or surgical procedure. The 3 most common associations are trauma, infection, and cardiac disease, especially myocardial infarction and congestive heart failure.
- Recent surgery
- Abdominal
- Orthopedic
- Neurologic
- Urologic
- Cardiac
- Severe pulmonary disease
- Severe electrolyte disturbance
- Severe cardiovascular disease
- Severe constipation
- Malignancy
- Systemic infection
- Medications
- Narcotics
- Anticholinergics
- Clonidine
- Amphetamines
- Phenothiazines
- Steroids
More on Ogilvie Syndrome |
Overview: Ogilvie Syndrome |
| Differential Diagnoses & Workup: Ogilvie Syndrome |
| Treatment & Medication: Ogilvie Syndrome |
| Follow-up: Ogilvie Syndrome |
| References |
| Next Page » |
References
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Further Reading
Keywords
Ogilvie syndrome, Ogilvie's syndrome, acute colonic pseudo-obstruction, ACPO, colonic pseudoobstruction, bowel obstruction, colonic obstruction, acute large bowel obstruction, colonic perforation, intestinal perforation, peritonitis, nontoxic megacolon, bowel motility, adynamic distal colon, Hirschsprung disease, abdominal distention, obstipation, cecal perforation, cecostomy, colonoscopy, colonoscopic decompression, colectomy
Overview: Ogilvie Syndrome