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Adynamic ileus in the rat induced by chloral hydrate
Laboratory Animal Science
|April 1, 1977
Summary
Chloral hydrate anesthesia in rats can cause adynamic ileus, a non-infectious condition. This gastrointestinal issue, characterized by lethargy and constipation, may lead to death in laboratory animals.
Area of Science:
- Veterinary Medicine
- Toxicology
- Rodent Research
Background:
- Neurophysiologic studies in rats require anesthesia, with chloral hydrate commonly used for brain electrode implantation.
- Intraperitoneal administration of anesthetics can lead to unexpected complications in laboratory animals.
Observation:
- Adynamic ileus, a condition of intestinal inactivity, was incidentally observed in rats post-surgery.
- Initial investigations ruled out infectious agents as the cause of the observed ileus.
Findings:
- Experimentally induced adynamic ileus in rats using intraperitoneal chloral hydrate (400 mg/kg) at high concentrations (125–275 mg/ml).
- Clinical signs included lethargy, anorexia, abdominal distension, constipation, and death.
- Pathological findings revealed gaseous distension and atony of the cecum and small intestine, with serosal fibrosis.
Implications:
- Chloral hydrate, particularly at high concentrations, can cause significant gastrointestinal distress and mortality in rats.
- This highlights the importance of considering anesthetic-induced complications in rodent research.
- Findings suggest careful dose and concentration management of chloral hydrate to mitigate adverse effects in laboratory animals.