Flow resistances of disposable double-lumen, single-lumen, and univent tubes

Tracheal width and left double-lumen tube size: a formula to estimate left-bronchial width

“…A small tube is more likely to be advanced further into the bronchus where it can obstruct the upper lobe [1]. The lumens of smaller tubes offer greater resistance to airflow [2,3] and generate higher levels of auto-PEEP during 1-lung ventilation [4]. A tube that is too large or too small can damage the airway.…”

Anesthesia for Thoracic Surgical Procedures

“…If it is thought the airway might be lost in the exchange, leaving the double lumen in overnight with the head of the bed elevated to help alleviate edema might be the safest option. It has been shown that the flow resistances of modern double lumen tubes are actually much lower than previously supposed, so the need to change them is not as important during spontaneous ventilation and weaning from the ventilator as previously thought [92]. The effective diameter of each lumen of an adult double lumen endobronchial tube is comparable to a 6.0-7.0 mm outside diameter ETT [93], so adequate oxygenation/ventilation is manageable without exchanging the tube.…”

Anesthesia in Pediatric Thoracic Surgery

“…Özellikle küçük boy tüplerde bu daha önemlidir (6). Küçük boy Univent tüpün gaz akımına daha direnç-li olduğu da bildirilmektedir (20). BB'nin cerrahi kesiye maruz kalması ya da BB kafının trakeal lümene yakın bölgede şişirilerek ventilasyonun tamamen bloke olması komplikasyonlar arasındadır (18).…”