Describe the two techniques used to perform abdominocentesis. Which technique is most likely
to cause a laceration of an abdominal structure?
Abdominocentesis in the horse can be performed using either a hypodermic needle or a teat
cannula. Both techniques require a three-step surgical preparation of a 4" × 4" area on the
most ventral caudal area of the horses' abdomen.
Needle method: An 18g × 1.5" needle is placed into the abdominal cavity. This method is more
likely to result in inadvertent laceration of the bowel.
Teat cannula: After placing a small lidocaine bleb, a No. 15 scalpel blade is used to make a
stab incision through the skin. The teat cannula is then thrust through the muscle and parietal
layers into the abdominal cavity.
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