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To determine whether end-tidal partial pressure of carbon dioxide (Petco 2) was a reliable estimate of Paco2 in dogs undergoing thoracotomy.


Case series.


18 dogs that underwent thoracotomy.


Paco2 and Petco 2 were measured shortly after induction of anesthesia, while dogs were breathing spontaneously; 5 minutes prior to initial skin incision, while dogs were receiving intermittent positive-pressure ventilation (IPPV); 5, 30, and 60 minutes after the thoracic cavity was opened, while dogs were receiving IPPV; and after the thoracic cavity was closed and evacuated, when dogs were again breathing spontaneously. For each period, arterial-end-tidal difference in partial pressure of carbon dioxide (Paco2-Petco 2) was compared with Paco2-Petco 2 for the preceding period.


Significant changes in Paco2-Petco 2 from one period to the next were not detected except when values obtained 5 minutes after the thoracic cavity was opened were compared with values obtained 5 minutes before incision. The Paco2-Petco 2 was not constant for individual dogs.

Clinical Implications

Petco 2 was not a reliable indicator of adequacy of ventilation during thoracotomy in these dogs, because it differed greatly from Paco2, and Pac02-PETC02 was not consistent. (J Am Vet Med Assoc 1998; 212:377-379)

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in Journal of the American Veterinary Medical Association