Chronic intestinal pseudoobstruction syndrome

Chronic intestinal pseudo-obstruction (CIPO), also known as chronic intestinal pseudoobstruction syndrome, is a rare and severe motility disorder characterized by recurrent episodes of signs and symptoms resembling mechanical bowel obstruction in the absence of any actual physical blockage. The condition affects the gastrointestinal tract, primarily the small intestine and colon, though the esophagus and stomach may also be involved. In some forms, the urinary bladder can also be affected (megacystis-microcolon-intestinal hypoperistalsis syndrome). The underlying cause involves impaired coordinated contractions (peristalsis) of the gut wall due to abnormalities in the smooth muscle (myopathic forms), the enteric nervous system (neuropathic forms), or the interstitial cells of Cajal. CIPO can be primary (idiopathic or genetic) or secondary to other conditions such as connective tissue disorders, mitochondrial diseases, or neurological conditions. Key symptoms include severe abdominal distension, abdominal pain, nausea, vomiting, constipation, and an inability to tolerate oral feeding. Patients frequently experience malnutrition and weight loss due to impaired nutrient absorption. Bacterial overgrowth in the stagnant intestinal contents is a common complication, leading to diarrhea and further malabsorption. The condition can present at any age, from the neonatal period to adulthood, depending on the underlying etiology. Familial forms may follow autosomal dominant, autosomal recessive, or X-linked inheritance patterns, with mutations identified in genes such as ACTG2 (visceral myopathy), FLNA (X-linked form), TYMP and POLG (mitochondrial neurogastrointestinal encephalomyopathy), and others. Treatment is largely supportive and aimed at maintaining nutrition and managing symptoms. Prokinetic agents (such as erythromycin or octreotide) may be tried to stimulate intestinal motility, though their efficacy is variable. Nutritional support is critical and may require enteral tube feeding or total parenteral nutrition (TPN) in severe cases. Antibiotics are used to manage small intestinal bacterial overgrowth. Surgical interventions, including intestinal decompression procedures, may be necessary in some patients, and intestinal transplantation may be considered in cases refractory to all other treatments. The prognosis varies widely depending on the underlying cause and severity, with some patients experiencing significant morbidity and reduced quality of life.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

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