Which catheter is used for bronchospirometry and isolation of a portion of the lung during general anesthesia?

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Isolating a portion of the lung during anesthesia requires a device that can seal off a mainstem bronchus so one lung can be ventilated or tested while the other is kept separate. An endobronchial tube is designed for this purpose because it can be advanced into a main bronchus and seal the opposite lung, enabling selective ventilation. This setup, often involving a double-lumen tube, allows bronchospirometry by measuring gas exchange from the targeted lung without interference from the other lung. A standard endotracheal tube ventilates both lungs, so it cannot provide the necessary isolation. A tracheostomy tube and a nasogastric tube serve other functions and do not offer lung isolation. Thus, the endobronchial tube best fits the need for bronchospirometry and lung isolation during general anesthesia.