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Summary  Blood gases and pulmonary shunting were studied in 22 patients undergoing thoracic surgery. Eleven patients were intubated with a Carlens catheter and 11 with a regular endotracheal tube. A large degree of pulmonary shunting with corresponding hypoxaemia developed during the collapse of the upper lung in the open hemithorax in the Carlens catheter group. Ventilation with 100 per cent oxygen was not successful in correcting the hypoxaemia in these patients.  Patients with a regular endotracheal tube maintained satisfactory levels of O2 tensions throughout the study while breathing 100 per cent O2, which indicated that the partly collapsed upper lung contributed to ventilation and oxygenation of the patients during surgical procedures.

Carlens endobronchial catheter versus regular endotracheal tube during thoracic surgery: A comparison of blood gas tensions and pulmonary shunting