Colic

February 21, 2018

Description

 

Colic in horses is defined as abdominal discomfort or pain; it refers to a condition which can vary in cause, severity, outcome and treatment methods. The role of the veterinary surgeon is to determine the cause, make a diagnosis and initiate the appropriate treatment.

 

To understand the aetiology of colic we need to understand the underlying anatomy and physiology of the digestive system.

 

Here are some key concepts;

 

Horses are monogastric with a relatively small stomach capacity of 8-10 litres. The stomach is located on the left side of the abdomen beneath the rib cage.

 

At the distal junction of the oesophagus there is a one-way non–return valve permitting gas and ingesta to move into the stomach but not out. Conditions that impede the normal aboral movement of gas and ingesta through the digestive tract may result in discomfort, pain, distention, obstruction and potential rupture.

 

There can be anatomic abnormalities, such as inguinal hernias, or normal anatomical structures, such as abdominal spaces, which can cause displacement of intestines, or physiological processes, such as abnormal peristaltic motility patterns, which can cause obstructions.

 

Two main arteries feed the vasculature of the entire gastro intestinal system and obstructions may impede the flow of blood to organs.

 

 

Clinical Signs

 

There are numerous potential clinical signs for colic. Common symptoms can include;

 

  • signs of depression

  • lack of appetite

  • the horse may look and nip at its belly

  • perspiration

  • increased respiration

  • laying down more frequently

  • stretching out as if to urinate

  • sitting

  • pawing the ground

  • rolling or thrashing

  • appearing rounder than usual

  • unable to pass manure

  • abnormal gastric noises

It is important not to administer any medications to your horse without first consulting with your veterinarian, as they could mask clinical signs which are useful for diagnosis.

 

 

Causes / Risk Factors

 

There are many diseases which can manifest as colic. The general types of disorders outlined in the Merck Veterinary Manual which cause colic include;

 

  • distention of the intestinal lumen caused by gas, fluid or ingesta (flatulent colic)

  • simple obstruction of the intestinal lumen (impaction)

  • severe obstruction of the intestinal lumen or blood supply to the intestine (strangulating obstruction)

  • interruption of the blood supply to the intestine alone (nonstrangulating infarction)

  • inflammation of the intestine (enteritis)

  • inflammation of the lining of the abdominal cavity (peritonitis)

  • erosion of the intestinal lining (ulceration)

  • and “unexplained colic”

 

 

Diagnosis

 

Diagnosis may include;

 

  • physical assessment of the cardiopulmonary and GI systems

  • rectal examination and palpation

  • abdomen and thorax auscultation

  • abdominal percussion

  • response to nasogastric intubation

 

 

Treatment

 

Your veterinarian will adapt their treatment to the diagnosis of the current episode, however treatments may include;

 

  • pain relief

  • fluid therapy

  • parasite control

  • endotoxemia treatment

  • intestinal lubrication or laxatives

  • evacuation of intestinal contents

  • medical treatment

  • surgery, in cases with mechanical obstructions of the intestine

  • if necessary, surgery can be used for diagnosis as well as treatment

  • ultrasonography

 

Continuous treatment may be required for 3-5 days before clinical signs begin to subside.

 

 

Prognosis

 

A large retrospective study in the USA documented an overall survival rate of 60% for horses with colic and a survival rate of 50% for those horses undergoing abdominal surgery, including those euthanised during surgery for inoperative conditions. Survival rates for horses with strangulating obstruction and inflammatory diseases were only 24% and 42%, respectively. In contrast, horses with an undefined cause for the colic episode had a survival rate of 94% (Merck Vet Manual).

 

 

Management and Prevention

 

Colic prevention includes;

 

  • constant access to clean water

  • regular parasite control

  • free grazing

  • at least 1% of horse's bodyweight in roughage daily

  • more frequent, smaller feeds

  • make feed changes gradually

  • in sandy areas feed 400g/500kg/day psyllium powder for 7 days, repeated 2–3 times each year

 

 

Please contact a member of our equine veterinary team if you require any information or assessment of your horse.

 

In emergencies call 0417 769 665.

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