Ogilvie Syndrome (ACPO) Comprehensive Guide: Symptoms, Triggers, and Care
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer: Ogilvie Syndrome at a Glance
Ogilvie syndrome, or acute colonic pseudo-obstruction, is sudden paralysis of the colon without a physical blockage, usually in older hospitalized adults after surgery, heart problems or infection. [1] It causes abdominal swelling, pain, nausea and vomiting. [1] A colon wider than 12 cm raises the risk of complications. [1] Treatment includes bowel rest, IV fluids, decompression, neostigmine or colonoscopy. [1] [2]
Feature | Details |
Medical name | Acute colonic pseudo-obstruction (ACPO). [1] |
Core issue | Sudden paralysis of the colon without a physical blockage. [1] |
Typical patient | Older adults with other health conditions (average age about 60), most often in the hospital. [1] |
Common triggers | Surgery (abdominal, heart, orthopedic, or C-section), heart attack or heart failure, injury, and severe infection. [1] |
Primary symptoms | Abdominal swelling (distension), pain, nausea and vomiting, loss of appetite, bloating, and gas. [1] |
Critical risk | A colon wider than 12 cm (normal is about 8 cm), which raises the risk of complications. [1] |
Treatment | Bowel rest, IV fluids, decompression tubes, neostigmine, or a decompressive colonoscopy. [1] |
How common | About 1 in 1,000 hospital admissions. [1] |
What the research says
Management has changed little in decades. A clinical review describes ACPO as a functional disorder in which colonic dysmotility causes the colon to swell without a mechanical obstruction, and notes that its underlying cause remains unclear. People with a perforation or suspected loss of blood supply (ischemia) need an operation. Others start with conservative care: bowel rest, correction of electrolyte problems, and mobilization. If that fails, or if the cecum (the start of the colon) is markedly dilated, the colon is decompressed with neostigmine or colonoscopy. A subset of people have symptoms that keep coming back, and an underlying colon motility disorder may be considered in them. (Arthur and Burgess, Clin Colon Rectal Surg, 2022) [2]
Prompt diagnosis and treatment lead to better outcomes. A guideline from the American Society for Gastrointestinal Endoscopy states that the leading explanation for ACPO is altered control of the colon by the autonomic nervous system, causing distension without a mechanical blockage, and that prompt diagnosis and intervention improve outcomes. The guideline covers when endoscopy has a role in evaluating and managing ACPO. (Naveed et al., Gastrointest Endosc, 2020) [3]
What Is Ogilvie Syndrome?
Ogilvie syndrome, also known as acute colonic pseudo-obstruction (ACPO), is a sudden and unexplained paralysis of the colon, the large intestine. [1] The colon acts as if it is blocked, but nothing is physically obstructing it. [1] The problem is in the colon's motor system, which stops moving food along. [1] Gas and food build up inside, and the walls of the colon widen (dilate). [1]
How It Differs From Other Conditions
Other intestinal pseudo-obstruction. "Intestinal pseudo-obstruction" is an umbrella term for any paralysis of the intestines that isn't caused by a mechanical blockage. Ogilvie syndrome is the acute type (sudden and temporary) and affects only the colon. Some people have a chronic form caused by a long-term disease or a condition present from birth. [1]
Paralytic ileus. Paralytic ileus usually affects both the small and large intestines. It is very common after abdominal surgery, when the bowels are slow to start working again, and it usually resolves on its own in a few days. [1] Ogilvie syndrome affects the colon, usually starting at the cecum. It is uncommon and tends to be more complex. [1]
Who Gets It?
Anyone can get Ogilvie syndrome, but it most often affects older adults with several underlying health conditions. [1] The average age is about 60. [1] About 1 in 1,000 hospital admissions involves Ogilvie syndrome. [1]
What are the symptoms of Ogilvie syndrome (ACPO)?
Ogilvie syndrome symptoms include visible belly swelling, abdominal pain, loss of appetite, nausea and vomiting, bloating and gas, and constipation or diarrhea as food and gas build up in the colon. [1]
What causes and triggers Ogilvie syndrome (ACPO)?
The exact cause isn't fully understood. [1] Scientists believe it comes from dysfunction of the autonomic nervous system, the part of the nervous system that controls the involuntary muscle movements of the bowel (peristalsis). [1] [3] Because the condition is acute, some unusual stress on the body probably triggers it, and other health factors likely contribute. [1]
Acute Triggers
Preexisting Risk Factors
Health factors that may contribute include kidney failure, respiratory failure, neurological disease, cardiovascular disease, cancer, metabolic disorders, electrolyte imbalances, advanced age, physical debilitation, and taking multiple medicines. [1] Medicines linked to Ogilvie syndrome include antipsychotics, amphetamines, corticosteroids, opioids, immunosuppressants, and spinal anesthesia. [1]
What are the possible complications of Ogilvie syndrome?
Ogilvie syndrome often resolves on its own or with supportive care. [1] But if it goes unrecognized and keeps worsening, serious complications can happen. [1] Studies suggest that complications are more likely when the colon is dilated wider than 12 cm (the normal diameter is about 8 cm), and the risk rises as the dilation increases. [1]
Complication | What happens |
Ischemia | Too much pressure on the colon wall can cut off its blood supply, causing severe inflammation (ischemic colitis) and, without treatment, tissue death (necrosis). [1] |
Perforation | Dead tissue is especially likely to tear. A hole in the colon lets bacteria and toxins escape into the abdominal cavity (peritonitis). [1] |
Sepsis | Peritonitis can spread to the bloodstream. This is an emergency, and it can lead to septic shock and multiple organ failure. [1] |
How Is Ogilvie Syndrome Diagnosed?
Diagnosis relies on imaging that shows a dilated colon with no physical bowel obstruction, plus tests to rule out other possible causes. [1] To see the colon in detail, providers use radiology with a contrast agent that coats the inside of the colon. The contrast may be swallowed or given through an enema or IV. Contrast CT scans and contrast fluoroscopy are two methods used. [1]
One test, a gastrografin enema, may even double as a treatment. [1] A water-soluble contrast liquid is placed into the colon through the rectum, and video X-rays (fluoroscopy) follow it. As a side effect, gastrografin may act as a laxative and help get the colon moving again. [1]
How Is Ogilvie Syndrome Treated?
Treatment depends on how dilated the colon is and whether you appear to be at risk of complications. [1] When possible, providers treat Ogilvie syndrome conservatively, with supportive care and close observation. When needed, they use medicines or procedures to decompress the colon. Complications need urgent care. [1]
Conservative and Supportive Care
Treating contributing conditions and stopping medicines that may be contributing. [1]
Bowel rest [1]: no food by mouth, to reduce pressure on the colon.
IV fluids to keep you hydrated and correct electrolyte imbalances. [1]
Movement [1]: taking walks or changing positions to encourage bowel movement.
Decompression tubes: a nasogastric tube to suction excess air and fluid from the stomach, or a rectal tube to drain air and fluid by gravity. [1]
Monitoring with regular imaging and blood tests to check for progress or complications. [1]
When More Is Needed
If the colon is already wider than 12 cm, or if conservative treatment hasn't worked after 72 hours [1], your provider may want to step in to relieve the colon:
Colonoscopic decompression. A colonoscope is used to suction excess air out of the colon, and an enema may be given through it. It is used cautiously because it is difficult to perform and carries a small risk of complications, including perforation. [1]
Neostigmine injection. This IV medicine is a muscle activator, often used to wake up muscles after anesthesia. It has shown good results in restarting colon muscle activity in Ogilvie syndrome. [1] It is powerful, so it is given only under close observation in the ICU [1], with heart monitoring because it can slow the heart. [1]
Colectomy or colostomy. If the colon keeps dilating despite treatment, or if there is perforation or tissue death, surgery to remove the affected part of the colon may be needed. [1] This is a last resort, and a colostomy may be temporary or permanent. [1]
What Is the Outlook?
Without complications, Ogilvie syndrome is likely to resolve shortly with conservative treatment. [1] Complications can be fatal: the mortality rate with complications such as perforation or ischemia is up to 40%, but fewer than 15% of people develop these complications. [1] Without complications, the mortality rate is closer to 15%, and this probably reflects the other serious health conditions most people with Ogilvie syndrome already have rather than Ogilvie syndrome alone. [1] Early recognition is the key to preventing the serious complications. [1]
What is the bottom line on Ogilvie syndrome?
Ogilvie syndrome is a complex condition that needs rapid recognition to prevent serious abdominal complications. The symptoms can be distressing, but many cases respond to supportive care and targeted medical treatment. For people in the hospital, watching bowel function after surgery or a severe illness is the best way to catch it early.
Want more digestive health guides? Explore more plain-language information on digestive health and intestinal conditions at Rinnit.com.
Frequently Asked Questions
Is Ogilvie syndrome the same as a bowel obstruction?
No. A bowel obstruction is a physical blockage. Ogilvie syndrome is a "pseudo-obstruction" caused by paralysis of the colon's muscle movement, with nothing physically blocking the bowel. [1]
What causes Ogilvie syndrome?
The exact cause isn't fully understood. It is thought to involve dysfunction of the autonomic nervous system [1] [3], and it is most often triggered by surgery, injury, severe infection, or a heart event in older adults with other health conditions. [1]
Can medicines cause Ogilvie syndrome?
Some medicines have been linked to it, including antipsychotics, amphetamines, corticosteroids, opioids, immunosuppressants, and spinal anesthesia. [1] Never stop a prescribed medicine on your own. Your care team will review your medicines if Ogilvie syndrome is suspected.
How do doctors know it's Ogilvie syndrome?
Imaging such as a contrast CT scan or fluoroscopy shows a dilated colon with no physical blockage, and other possible causes are ruled out. [1]
Is Ogilvie syndrome permanent?
No. It is an acute condition, which means it is sudden and temporary, and it often resolves with supportive care. [1]
What is the average age of people with Ogilvie syndrome?
The average age is about 60. [1]
Can Ogilvie syndrome happen after a C-section?
Yes. Cesarean delivery is one of the surgeries known to trigger it. [1]
What is the main danger of Ogilvie syndrome?
The colon can widen so much that its blood supply is cut off or it tears (perforation), which can lead to a severe abdominal infection and sepsis. [1]
What is neostigmine?
It is a muscle-activating medicine given through an IV. It can restart colon muscle activity in Ogilvie syndrome, but it is given only under close observation in the ICU, with heart monitoring. [1]
How wide can the colon get in Ogilvie syndrome?
A normal colon is about 8 cm wide. Complications become more likely when it is dilated beyond 12 cm. [1]
Does walking help Ogilvie syndrome?
Taking walks or changing positions is often encouraged as part of supportive care to help stimulate bowel activity. [1]
What is a gastrografin enema?
It is a test in which a water-soluble contrast liquid is placed into the colon through the rectum and followed with video X-rays. It may also act as a laxative and help the colon start moving again. [1]
Will I need surgery for Ogilvie syndrome?
Often not. Ogilvie syndrome often resolves on its own or with supportive care. [1] Surgery is a last resort for a colon that keeps dilating or for complications such as perforation or tissue death. [1]
Can Ogilvie syndrome cause diarrhea?
Yes. Constipation, diarrhea, or both can happen. [1]
How common is Ogilvie syndrome?
It is uncommon. About 1 in 1,000 hospital admissions involves it. [1]
Is Ogilvie syndrome fatal?
Complications can be fatal, which is why early recognition matters. Fewer than 15% of people develop complications such as perforation or ischemia. [1] Mortality is higher with complications (up to 40%) and closer to 15% without them, mostly reflecting the other serious conditions these patients already have. [1]
References
Cleveland Clinic. Ogilvie Syndrome. Cleveland Clinic. Updated March 8, 2023. https://my.clevelandclinic.org/health/diseases/17141-ogilvie-syndrome
Arthur T, et al. Acute Colonic Pseudo-Obstruction. Clin Colon Rectal Surg. 2022;35(3):221-226. PMID 35966377. https://doi.org/10.1055/s-0041-1740044
Naveed M, et al. American Society for Gastrointestinal Endoscopy guideline on the role of endoscopy in the management of acute colonic pseudo-obstruction and colonic volvulus. Gastrointest Endosc. 2020;91(2):228-235. PMID 31791596. https://doi.org/10.1016/j.gie.2019.09.007
Medical disclaimer
This article is for general informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment decisions. Severe belly swelling or pain, repeated vomiting, fever, or a fast heartbeat need urgent medical care.
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