Blood gas and pH studies during use of the carlens catheter

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

“…~ However, it is known that extremely low arterial oxygen tensions can occur with this technique because of excessive pulmonary shunting through the collapsed lung on the open side of the thorax and atelectatic areas in the dependent lung. 2 On the other hand, if patients are intubated with a regular endotracheal tube during thoracic surgery, the independent lung could be ventilated at least partially throughout the operation, until the clamping of the bronchus. Theoretically, this would produce less pulmonary shunting in the nondependent lung, with an improved overall effect on oxygenation.…”

Step-by-step clinical management of one-lung ventilation: Continuing Professional Development

“…3,4 Complications Hypoxemia In the early days of thoracic anesthesia, hypoxemia was encountered in as many as 40% of cases with a Carlens double-lumen tube and manual ventilation. 8 The incidence of perioperative hypoxemia has decreased significantly over the years, likely due to better lung isolation, improved tube design, and newer volatile anesthetics with lesser effects on HPV. Rates of hypoxemia as low as 1% have been reported.…”

The introduction of blood gases into clinical practice

“…Blood gas analysis during endobronchial anaesthesia for pneumonectomy suggested that oxygenation was best maintained by delivering high concentrations of oxygen, ligating the pulmonary artery early in the operation and vigorously ventilating the dependent lung. 18 As diagnostic laparoscopy became increasingly popular in the early 1960s, surgeons began to perform more lengthy procedures via the laparoscope, such as biopsies, aspirations and tubal ligations. The combination of a tensely distended abdomen, carbon dioxide insufflation and steep head down position provided new challenges for anaesthetists.…”

“…Blood gas analysis during endobronchial anaesthesia for pneumonectomy suggested that oxygenation was best maintained by delivering high concentrations of oxygen, ligating the pulmonary artery early in the operation and vigorously ventilating the dependent lung. 18 …”