Orris

Ogilive syndrome

Reading File
Finding Sources
Finding Sources
Searching PubMed

Ogilvie syndrome acute colonic pseudo-obstruction

Reading File
Reading File
Reading File
Reading File
Reading File
Loading Image
Searching Images

Ogilvie syndrome acute colonic pseudo-obstruction abdominal X-ray dilated colon cecum

This composite diagnostic image illustrates acute colonic pseudo-obstruction, also known as Ogilvie's syndrome. Image A is an anteroposterior (AP) abdominal X-ray demonstrating marked, gaseous dilatation of the colon extending from the cecum through the splenic flexure. Notably, there is an absence of air-fluid levels or signs of pneumoperitoneum (free air). Image B is a coronal computed tomography (CT) scan of the same patient, providing a more detailed view of the massive large bowel dilatation. The CT reveals a clear transition and confirms that while the large bowel is severely distended, there is minimal involvement of the small bowel loops. Both imaging modalities highlight the lack of a mechanical obstructive lesion, pointing toward a functional motility disorder. These findings are clinically significant for diagnosing colonic pseudo-obstruction in a hospital setting, typically managed with bowel rest and pharmacological interventions.

This composite diagnostic image illustrates acute colonic pseudo-obstruction, also known as Ogilvie's syndrome. Image A is an anteroposterior (AP) abdominal X-ray demonstrating marked, gaseous dilatation of the colon extending from the cecum through the splenic flexure. Notably, there is an absence of air-fluid levels or signs of pneumoperitoneum (free air). Image B is a coronal computed tomography (CT) scan of the same patient, providing a more detailed view of the massive large bowel dilatation. The CT reveals a clear transition and confirms that while the large bowel is severely distended, there is minimal involvement of the small bowel loops. Both imaging modalities highlight the lack of a mechanical obstructive lesion, pointing toward a functional motility disorder. These findings are clinically significant for diagnosing colonic pseudo-obstruction in a hospital setting, typically managed with bowel rest and pharmacological interventions.

This composite diagnostic image demonstrates severe colonic dilatation in a 76-year-old male patient, consistent with Ogilvie syndrome (acute colonic pseudo-obstruction). Image A is an anteroposterior abdominal radiograph (X-ray) showing marked gaseous distention of the large bowel loops, particularly in the right and transverse colon segments. The haustral markings are visible but stretched, indicating significant intramural pressure. Image B is a sagittal view from a computed tomography (CT) scan with oral contrast, revealing a massively dilated transverse colon segment abutting the anterior abdominal wall. White arrows in both images highlight the most severely distended areas. The CT scan confirms the lack of a mechanical obstructing lesion and shows the relationship between the dilated bowel and the peritoneum. These findings illustrate typical radiological features of massive non-obstructive colonic dilatation, a critical finding in postoperative patients presenting with abdominal distension and vomiting. Educational focus includes distinguishing mechanical versus functional bowel obstruction through multi-modal imaging.

This composite diagnostic image demonstrates severe colonic dilatation in a 76-year-old male patient, consistent with Ogilvie syndrome (acute colonic pseudo-obstruction). Image A is an anteroposterior abdominal radiograph (X-ray) showing marked gaseous distention of the large bowel loops, particularly in the right and transverse colon segments. The haustral markings are visible but stretched, indicating significant intramural pressure. Image B is a sagittal view from a computed tomography (CT) scan with oral contrast, revealing a massively dilated transverse colon segment abutting the anterior abdominal wall. White arrows in both images highlight the most severely distended areas. The CT scan confirms the lack of a mechanical obstructing lesion and shows the relationship between the dilated bowel and the peritoneum. These findings illustrate typical radiological features of massive non-obstructive colonic dilatation, a critical finding in postoperative patients presenting with abdominal distension and vomiting. Educational focus includes distinguishing mechanical versus functional bowel obstruction through multi-modal imaging.

**Imaging Modality:** Abdominal X-ray (Supine view) **Anatomical Region:** Abdomen and pelvis **Observed Pathology:** Massive, generalized colonic dilatation consistent with Acute Colonic Pseudo-obstruction (Ogilvie’s Syndrome). **Characteristic Visual Features:** The radiograph demonstrates profound gaseous distension of the large bowel, most prominent in the cecum, ascending colon, and transverse colon. The haustral markings remain visible despite the severe mural stretching, a feature that helps distinguish colonic from small bowel dilatation. There is a lack of evidence of mechanical transition points or distal gas depletion, with air visualized throughout the rectum and sigmoid colon. The small bowel loops appear mildly dilated but are secondary to the primary colonic findings. **Diagnostic Features:** * **Cecal Diameter:** Significant enlargement, increasing the risk of mural ischemia or perforation. * **Gas Distribution:** Diffuse gaseous distension involving the proximal and distal colon without a definitive obstructing lesion. * **Skeletal/Metallic Findings:** Presence of a left total hip arthroplasty component in the lower field and degenerative changes in the lumbar spine. **Clinical Significance:** High-risk radiographic presentation of functional colonic obstruction requiring urgent clinical correlation to prevent cecal rupture.

**Imaging Modality:** Abdominal X-ray (Supine view) **Anatomical Region:** Abdomen and pelvis **Observed Pathology:** Massive, generalized colonic dilatation consistent with Acute Colonic Pseudo-obstruction (Ogilvie’s Syndrome). **Characteristic Visual Features:** The radiograph demonstrates profound gaseous distension of the large bowel, most prominent in the cecum, ascending colon, and transverse colon. The haustral markings remain visible despite the severe mural stretching, a feature that helps distinguish colonic from small bowel dilatation. There is a lack of evidence of mechanical transition points or distal gas depletion, with air visualized throughout the rectum and sigmoid colon. The small bowel loops appear mildly dilated but are secondary to the primary colonic findings. **Diagnostic Features:** * **Cecal Diameter:** Significant enlargement, increasing the risk of mural ischemia or perforation. * **Gas Distribution:** Diffuse gaseous distension involving the proximal and distal colon without a definitive obstructing lesion. * **Skeletal/Metallic Findings:** Presence of a left total hip arthroplasty component in the lower field and degenerative changes in the lumbar spine. **Clinical Significance:** High-risk radiographic presentation of functional colonic obstruction requiring urgent clinical correlation to prevent cecal rupture.

Reading File
Reading File
I now have all the information needed for a thorough, well-sourced answer. Here is the comprehensive overview:

Ogilvie Syndrome (Acute Colonic Pseudo-obstruction)

Definition and History

Ogilvie syndrome - also called acute colonic pseudo-obstruction (ACPO) - is acute massive dilatation of the colon in the complete absence of any mechanical obstruction. It was first described by Sir William Heneage Ogilvie in 1948. The estimated incidence is approximately 100 per 100,000 hospital admissions; it occurs in about 0.1% of all surgical cases. In roughly 5% of cases, no precipitant is identified. - Sabiston Textbook of Surgery, p. 2085; Yamada's Textbook of Gastroenterology, p. 1196

Pathophysiology

The exact cause remains unknown, but the leading hypothesis centers on dysregulation of colonic autonomic innervation:
  • A relative excess of sympathetic over parasympathetic tone leads to functional inhibition of colonic motility
  • Ogilvie's original proposal: an imbalance among intrinsic, sympathetic, and parasympathetic neural control
  • The strong association with orthopedic surgery of the lower back and hips is explained by afferent stimulation of sympathetic reflexes in the thoracolumbar spinal cord, causing reflex sympathetic inhibition of colonic motility
  • Other mechanisms: disrupted colonic reflex arcs, chronic systemic illness, and medications that suppress motility
  • Yamada's Textbook of Gastroenterology, p. 1196

Risk Factors and Associated Conditions

CategoryExamples
PostsurgicalMajor orthopedic/spinal surgery, solid organ transplants, cardiac procedures, C-section
NeurologicParkinson disease, Alzheimer disease, stroke, spinal cord injury
CardiacCongestive heart failure, myocardial infarction
PulmonaryCOPD
TraumaMajor trauma, shock, burns
MetabolicDiabetes, renal failure, electrolyte disturbances (hypokalemia in 20-30%)
InfectiousCMV, varicella-zoster virus
DrugsOpiates, anticholinergics, anti-Parkinson drugs, antipsychotics, clonidine, chemotherapy
AutoimmuneLupus, scleroderma
The typical patient is elderly, male, with multiple comorbidities, and has experienced an acute physiological stress in the preceding days. - Sabiston Textbook of Surgery, p. 2085

Clinical Presentation

  • Abdominal distension - the dominant feature, developing over 1-7 days
  • Abdominal pain - constant but usually mild
  • Nausea and vomiting in >50% of patients
  • Obstipation is common; paradoxically, some patients have diarrhea (from hypersecretion)
  • Decreased or absent bowel sounds (or high-pitched tinkling sounds)
  • Labored breathing from diaphragm elevation
  • Red flags for ischemia/perforation: fever, significant tenderness, rebound, leukocytosis - these are uncommon initially but must be sought

Imaging

Plain abdominal radiograph - the initial diagnostic step:
  • Massive gaseous distension predominantly in the cecum and right colon (cecum typically 9-12 cm)
  • Gas distributed throughout the colon including the rectum - this pattern distinguishes pseudo-obstruction from mechanical obstruction (where no gas is seen distal to the blockage)
  • Small bowel is usually not dilated
Here is a radiograph from a patient with Ogilvie syndrome secondary to urosepsis showing an acutely enlarged cecum and ascending colon:
Abdominal X-ray showing massive gaseous dilatation of the colon with air distributed throughout including the rectum, consistent with Ogilvie syndrome
This composite image (AP X-ray + coronal CT) from another case shows marked colonic dilatation without a mechanical transition point - typical of ACPO:
Composite image showing AP abdominal X-ray and coronal CT scan of acute colonic pseudo-obstruction (Ogilvie syndrome) with massive large bowel dilatation and no obstructing lesion
CT scan is now the standard confirmatory test - it reliably distinguishes pseudo-obstruction from mechanical obstruction and can identify signs of ischemia or impending perforation. A water-soluble contrast enema can also exclude mechanical obstruction and often provides some decompression in the process.

Differential Diagnosis

  • Mechanical large bowel obstruction (carcinoma, volvulus) - distinguished by CT/contrast enema
  • Toxic megacolon - occurs in severe inflammatory bowel disease or infectious colitis (C. difficile); usually accompanied by systemic toxicity
  • Ischemic colitis - shares many risk factors; female predominance; mucosal changes on CT/colonoscopy
  • Colonic volvulus (sigmoid or cecal)

Management

Treatment follows an escalating stepwise approach based on cecal diameter, risk of perforation, and response to therapy.

Step 1: Supportive Care (cecal diameter < 12 cm, no ischemia/perforation)

  • NPO, IV fluids, nasogastric tube
  • Rectal tube placement for decompression
  • Correct electrolytes (especially hypokalemia)
  • Discontinue offending drugs: opiates, anticholinergics, anti-Parkinson agents, antidepressants, neuroleptics, clonidine
  • Encourage ambulation, prone positioning, knee-chest position to encourage flatus
  • Serial abdominal exams and X-rays
  • Avoid osmotic and stimulant laxatives (worsen dilation)
  • Most cases resolve with these simple measures

Step 2: Pharmacologic Decompression (cecal diameter > 12 cm OR no response to supportive care)

Neostigmine is the cornerstone of pharmacologic therapy:
  • Mechanism: Acetylcholinesterase inhibitor → increases muscarinic/parasympathetic activity → colonic peristalsis
  • Dose: 2-2.5 mg IV over 3-5 minutes
  • Response: flatus and bowel movement within 10 minutes in most responders
  • Success rate: 60-94%; recurrence in up to 31% (may need repeat dosing)
  • Contraindications: mechanical obstruction, ischemia, perforation, bradycardia, recent MI, asthma/COPD, renal failure, myasthenia gravis
  • Monitoring: continuous cardiac monitoring; atropine 0.4-0.6 mg IV immediately available for bradycardia
  • Side effects: bradycardia, bronchospasm, vomiting, cramping, excessive salivation
  • Alternative: epidural anesthesia (sympathetic blockade) for selected patients
  • Limited evidence also supports naloxone or methylnaltrexone when opioids are a contributing factor

Step 3: Endoscopic Decompression (failure of neostigmine, or contraindication)

  • Colonoscopic decompression if no response after 72 hours
  • Scope advanced to hepatic flexure (not necessary to reach cecum) with minimal insufflation
  • Aspiration of proximal gas collapses the right colon
  • Success rate: 61-95% initial; 70-90% sustained
  • Colonic decompression tube can be placed
  • Risk of perforation: 1-3%
  • Post-resolution: polyethylene glycol 3350 (29.5 g daily) may reduce recurrence

Step 4: Surgery

Indicated when:
  • Signs of ischemia, perforation, or systemic toxicity
  • Cecal diameter > 14 cm with no response to medical/endoscopic therapy
  • Viable colon: tube cecostomy (laparoscopic possible) is preferred
  • Ischemia without perforation: right hemicolectomy + primary anastomosis
  • Perforation: right hemicolectomy + ileostomy and mucous fistula

Complications and Prognosis

  • Ischemia and perforation occur in 3-15% of cases
  • Perforation carries a ~50% mortality rate
  • Overall mortality: 25-31%
  • Poor prognosis associated with: older age, greater illness severity, larger cecal diameter, longer time to decompression, presence of colonic ischemia

Recent Evidence

A 2025 meta-analysis (PMID 40664115) compared neostigmine versus colonoscopic decompression for ACPO not resolving with conservative measures - confirming both modalities as effective second-line options when initial conservative management fails.
Sources: Sabiston Textbook of Surgery 21e, p. 2085-2086 | Yamada's Textbook of Gastroenterology 7e, pp. 1196-1197 | Fischer's Mastery of Surgery 8e | Harrison's Principles of Internal Medicine 22e (2025)
This is a shared conversation. Sign in to Orris to start your own chat.