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In most instances, however, fluid therapy must be started before laboratory results are available, particularly when the horse is showing clinical signs of circulatory shock.When IV fluids are needed but the clinical signs are mild to moderate, the horse is usually given 8–10 L of a sterile replacement fluid that contains electrolytes in concentrations similar to those that normally exist in the blood. The cecum is 4–5 ft (1.2–1.5 m) long and can hold 27–30 L of feed and fluid. The oral mucous membranes should be evaluated for color, moistness, and capillary refill time. In most instances, lubricants or fecal-softening agents given through a nasogastric tube soften the impacted ingesta, allowing it to be passed. Consequently, conditions that impede the normal aboral movement of gas and fluid through the small intestine may result in severe dilation and rupture of the stomach. Fluid sounds may indicate impending diarrhea associated with colitis. Just as with all animals, a horse’s intestinal tract is filled with a wide variety of microorganisms. Passing a stomach tube may, therefore, save the horse’s life and assist in diagnosis of these conditions. Endotoxemia remains the leading cause of death in horses, being intimately involved in the pathogenesis of gastrointestinal disorders that cause colic and neonatal foal septicemia. For example, passing a nasogastric tube (also an important part of the diagnostic evaluation) may remove any fluid that has accumulated in the stomach because of an obstruction of the small intestine.
Endotoxemia remains the leading cause of death in horses, being intimately involved in the pathogenesis of gastrointestinal disorders that cause colic and neonatal foal septicemia. We do not control or have responsibility for the content of any third-party site., DVM, PhD, Department of Large Animal Medicine, College of Veterinary Medicine, University of GeorgiaIn its strictest definition, the term “colic” means abdominal pain. In healthy horses, the small intestine cannot be palpated; with small-intestinal obstruction, strangulating obstruction, or enteritis, the distended duodenum can be palpated dorsal to the base of the cecum on the right side of the abdomen, and distended loops of jejunum can be identified in the middle of the abdomen.A sample of peritoneal fluid (obtained via paracentesis performed aseptically on midline) often reflects the degree of intestinal damage.
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Equine gastrointestinal anatomy
The type of medical treatment is determined by the cause of colic and the severity of the disease. Diseases Associated with Colic by Anatomic LocationRuminants (cattle, sheep, and goats) lack which of the following teeth?
Survival rates for horses with strangulating obstruction and inflammatory diseases were only 24% and 42%, respectively. Clinical experience suggests that flunixin meglumine may mask the early signs of conditions that require surgery and, therefore, must be used carefully in horses with colic.The most commonly used sedative for colic is xylazine, an αAlthough pain relief usually is provided by analgesics, there are other important ways to reduce the degree of pain. When the segment of the GI tract was considered, the survival rates for conditions affecting the small intestine and stomach were poorer than for those affecting the large colon. In In most cases of colic, pain is mild, and analgesia is all that is needed. Finally, the ingesta enters the sacculated descending colon, which is 10–12 ft (3–3.6 m) long.The large intestine of the horse. Cryptosporidiosis
In severe cases, hypertonic saline (7% NaCl) may be given to rapidly increase plasma volume. Antimicrobial doses of polymyxin B are substantially higher than the dose used to bind endotoxin and may be nephrotoxic.
Endotoxemia is the result of gram-negative bacteria moving from the horse’s intestines to its bloodstream. Horses with palpable intestinal distention have lower survival rates than horses lacking evidence of intestinal distention, and survival rates are even lower if no intestinal sounds are audible on auscultation of the abdomen. Gross and histopathological findings were useful in confirming endotoxemia in dead animals. The last 18 in. Furthermore, changes in peritoneal fluid lactate concentrations over time have been used to help identify horses that require emergency abdominal surgery. Although data on longterm survival (ie, the horse returning to its intended use) are more difficult to obtain, recent findings indicate that most horses that die or are euthanized because of serious problems do so within 3 mo after surgery.Values obtained from several variables are often combined to predict survival in horses with colic. This ligament provides a “shelf” over which large colon can be displaced.Nephrosplenic ligament in the horse.