Veterinary Clinical Medicine-I (General and Systemic)

VOMITING

• Forceful ejection of contents of the stomach and the proximal small intestine through the mouth is called vomiting
• True vomiting occurs in monogastric animals. True vomiting is not a feature of gastric diseases in horses.
  • The strong cardiac sphincter inhibits the release of stomach contents
  • The soft palate and epiglottis combine to affect a seal between the oral and nasal parts of the pharynx. Hence the stomach contents are discharged through the nasal cavities and not through the mouth in case of vomiting in horses.

Vomiting

• Coordinated vigorous contraction of abdominal, thoracic and diaphragmatic muscle with resultant forceful ejection of vomitus from the mouth is called vomiting
• Nausea: outward sign of nausea include depression, shivering, hiding, yawning and lip licking. 
• Retching is second phase of vomiting and consists of forceful contractions of the abdominal muscles and diaphragm occurring with the glottis closed to produce negative intrathoracic pressure and positive abdominal pressure. These pressure changes are associated with movement of gastric contents into a dilated esophagus.