Open-chest CPR: indications
In which of these situations is open-chest CPR most indicated instead of external compression?
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A. 4 kg cat in asystole after anaesthesia
In cats and small dogs external compression is effective because the chest is highly compliant; open-chest CPR offers no advantage here.
B. 10 kg dog in arrest due to hypoglycaemia
This is a reversible metabolic cause treated with external CPR and glucose correction; there is no intrathoracic problem that would justify opening the chest.
C. Any dog after 2 minutes of external CPR without return of circulation
Two minutes without response does not justify a thoracotomy: good-quality external CPR should be continued for several cycles, and thoracotomy requires a team, equipment and prior owner consent.
D. Large dog in arrest with tension pneumothorax, pericardial effusion or penetrating thoracic trauma
Correct. In pleural space disease, tamponade or severe thoracic trauma external compression does not generate effective flow. It is also considered when the chest or abdomen is already open in surgery, and in large dogs in which external CPR is ineffective.
lightbulb Key takeaway
Open-chest CPR (thoracotomy at the left 5th–6th intercostal space and direct cardiac massage) achieves better perfusion, but requires a prepared team, equipment, intensive aftercare and prior owner consent.
References: RECOVER clinical guidelines for veterinary CPR (2012)
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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.