VTNE Practice Question of the Day: Emergency & Critical Care - Vet Tech Board Exam Prep

Topic: Emergency & Critical Care

A horse presents with acute onset of severe abdominal pain. On physical examination, heart rate is 72 bpm, gut sounds are absent in all four quadrants, and nasogastric intubation yields 4.5 liters of reflux. The horse's pain level is 7/10. What does the volume of gastric reflux indicate and what is the next appropriate action?

A. 4.5L reflux is normal for a horse; continue monitoring and repeat auscultation

B. Greater than 2L reflux indicates small intestinal obstruction; do not administer fluids via NG tube until reflux is resolved

C. Reflux of any volume should prompt immediate IV fluid bolus administration

D. Less than 2L reflux is abnormal; administer oral fluids via NG tube to rehydrate

E. Remove NG tube, administer analgesics, and schedule radiographs

Think you know it? Comment your answer (A-E) and your reasoning before scrolling.

Correct Answer: >!B. Greater than 2L reflux indicates small intestinal obstruction; do not administer fluids via NG tube until reflux is resolved!<

Explanation: >!CORRECT (B - Greater Than 2L Indicates Small Intestinal Obstruction, No NG Fluids): The finding of 4.5 liters of nasogastric reflux in a horse with severe colic and absent gut sounds indicates a small intestinal obstruction with proximal fluid accumulation. In horses, any spontaneous gastric reflux is abnormal, and volumes exceeding 2 liters are a clinical marker for small intestinal obstruction — distinguishing it from large intestinal disease, which typically does not produce significant reflux. Because the stomach is already overdistended with reflux, administering fluids or electrolytes via NG tube is absolutely contraindicated until reflux has resolved, as doing so would cause gastric rupture. IV fluid administration is appropriate, and continued NG decompression should be maintained, as outlined in the White equine internal medicine chapter and the Merck Veterinary Manual.

A - 4.5L is normal: Horses have no normal net positive gastric reflux; any significant volume obtained on NG intubation is pathological, and 4.5 liters represents a large and clinically serious obstructive finding. B - Greater than 2L indicates SI obstruction, no NG fluids: The correct interpretation and management; 4.5L reflux confirms SI obstruction and absolutely contraindicates NG fluid administration due to risk of gastric rupture from additional volume. C - Immediate IV fluid bolus from any reflux: While IV fluids are appropriate for this patient, the specific management prompt from the reflux volume is the avoidance of NG fluid administration, not automatic IV fluid bolus independent of the volume finding. D - Less than 2L is abnormal and oral fluids: The threshold is reversed — greater than 2L indicates SI obstruction; oral or NG fluid administration is strictly contraindicated in the presence of active significant reflux due to rupture risk. E - Remove NG tube and schedule radiographs: The NG tube should remain in place for ongoing gastric decompression; equine abdominal radiographs have minimal diagnostic utility for soft tissue structures and have been largely supplanted by transabdominal ultrasound and abdominocentesis in the workup of equine colic.

MNEMONIC: HORSE REFLUX greater than 2L = SI OBSTRUCTION — NO fluids via NG, give IV instead and keep the tube IN for decompression.

References: Merck Veterinary Manual, Equine Colic and Gastric Reflux section (merckvetmanual.com); Wingfield WE, Raffe MR. The Veterinary ICU Book, Equine Gastrointestinal Emergency chapter.!<

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