Ogilvie Syndrome

Overview

Ogilvie syndrome, also called acute colonic pseudo-obstruction, is a condition in which the large intestine (colon) becomes greatly enlarged and stops moving its contents forward, even though there is no physical blockage. It behaves like a bowel obstruction, with swelling and a backup of gas and stool, but no actual barrier is present.

The problem is thought to come from a disturbance in the nerves that control the colon's movement, causing it to become inactive and stretch. Ogilvie syndrome usually occurs in people who are already ill or recovering from surgery or another serious medical condition. It needs prompt attention because a severely stretched colon can tear.

Normally, the muscles of the colon contract in a coordinated way to push contents along. In Ogilvie syndrome, this coordinated activity is disrupted, so the colon goes quiet and gas and stool accumulate. Because the colon keeps stretching without moving its contents forward, the wall can become thin and fragile. The larger the colon grows, the higher the risk of a tear, which is why doctors act quickly to relieve the pressure.

Symptoms

Symptoms develop over hours to days and resemble a bowel obstruction:

• A swollen, distended abdomen, sometimes dramatically so
• Abdominal pain or discomfort
• Nausea and vomiting
• Constipation or reduced passing of gas and stool
• Sometimes paradoxical passage of small amounts of loose stool

Worsening pain, fever, a fast heart rate, or a very tense, tender abdomen can signal that the colon is severely stretched or has torn, which is an emergency.

Causes

Ogilvie syndrome is thought to result from an imbalance in the nerve signals that control the colon's muscle activity, causing it to stop contracting and become enlarged. It typically develops in people who are already unwell. Common triggers and associated situations include:

• Recent surgery, especially major or orthopedic operations
• Serious infections or severe illness
• Certain medications, including some strong pain relievers
• Electrolyte imbalances, such as low potassium or magnesium
• Being immobile or bedridden

It is not caused by a physical blockage, which is the key feature that sets it apart from a true bowel obstruction.

Risk Factors

• Recent major surgery or trauma
• Serious illness or infection requiring hospital care
• Older age
• Use of opioid pain medicines and certain other drugs
• Electrolyte imbalances
• Prolonged bed rest or immobility

Diagnosis

Diagnosis focuses on confirming an enlarged colon and ruling out a true blockage:

• Imaging: An abdominal X-ray or CT scan shows the markedly enlarged colon. A CT scan can confirm there is no physical obstruction and check for signs of a tear.
• Physical examination: A doctor assesses the distended abdomen and looks for signs of complications.
• Blood tests: These check for infection and electrolyte imbalances that may contribute.

Treatment

Treatment aims to decompress the colon, correct triggers, and prevent the colon from tearing.

• Supportive care: Resting the bowel, giving fluids through a vein, and correcting electrolyte imbalances are first steps.
• Stopping contributing medicines: Drugs that slow the bowel, such as certain pain relievers, are reduced or stopped where possible.
• Decompression: A tube may be used to relieve pressure. A specific medication can help restart colon activity, and a colonoscopy can be used to decompress the colon.
• Surgery: If the colon is at risk of tearing or has perforated, surgery may be needed urgently.

With prompt treatment, many people recover well, especially when the underlying trigger is addressed. Correcting the contributing problem, whether it is an electrolyte imbalance, a medication, or another illness, is just as important as relieving the colon itself, because it helps prevent the syndrome from coming back.

When to See a Doctor

Ogilvie syndrome usually develops in people who are already in hospital, but it can be an emergency. Seek emergency care or alert the medical team right away for:

• A rapidly swelling, very tense or tender abdomen
• Severe abdominal pain
• Fever, a fast heart rate, or feeling very unwell
• Persistent vomiting with inability to pass gas or stool

These can signal that the colon is severely stretched or has torn, which requires urgent treatment.

Related Topics

Frequently Asked Questions

References

1. MedlinePlus, U.S. National Library of Medicine. Intestinal pseudo-obstruction.
2. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Bowel Disorders.
3. Merck Manual Consumer Version. Acute Colonic Pseudo-obstruction.
4. National Organization for Rare Disorders (NORD). Intestinal Pseudo-obstruction.