Traumatic diaphragmatic hernia: when to operate
4-year-old crossbreed dog hit by a car 4 hours ago. It arrived in shock with tachypnoea. After fluid therapy, analgesia and oxygen it is normotensive and breathing better. A diaphragmatic hernia with intestinal loops and part of the liver in the thorax is diagnosed; the stomach is in the abdomen. It has pulmonary contusion and occasional ventricular premature complexes.
When is it most appropriate to operate?
chevron_right Show answer and explanation
A. Once stabilised (perfusion, ventilation and arrhythmias controlled), usually within the first 24–72 hours
Correct. Operating in full shock increases anaesthetic risk, but there is no reason to wait weeks. Surgery is brought forward if the stomach herniates and distends, if there is visceral strangulation or if ventilation does not improve with oxygen and drainage.
B. Immediately, as soon as the diagnosis is confirmed, even if still in shock
Unless there is an emergency indication (herniated and distended stomach, strangulation, ventilatory failure), anaesthetising an unstable patient worsens the prognosis.
C. After 3–4 weeks, once the pulmonary contusion has resolved
Contusion improves within a few days; delaying for weeks favours adhesions between viscera and lung, and chronic lung collapse with a risk of re-expansion oedema.
D. Surgery is not needed if the stomach is in the abdomen and the dog breathes well at rest
The hernia does not close on its own and viscera may strangulate or the stomach may herniate at any time; surgical repair is indicated even if the patient is stable.
lightbulb Key takeaway
While waiting, keep the patient in sternal recumbency or with the front end raised, with oxygen and analgesia. If the herniated stomach distends, decompress it (tube or trocar) and operate as an emergency. During anaesthesia, ventilate with positive pressure from induction.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.