Double-lumen tubes and bronchial blockers
Stem
A 64-year-old woman, 170 cm and 68 kg, is scheduled for a video-assisted thoracoscopic right upper lobectomy for a 3 cm adenocarcinoma. She has a normal airway examination, and her chest CT shows a normal-caliber left main bronchus with no endobronchial lesion. The surgeon asks for good collapse of the right lung for the whole case.
Question
How will you isolate her lung, and how will you know the device is in the right place?
Ideal answer
HeadlineSurgical exposure is a relative indication; I place a left double-lumen tube and confirm it by fiberoptic bronchoscope.
- Left tube, even for right-sided surgery: the left main bronchus is long, with no upper-lobe orifice near the carina, and gives fast, reliable collapse, suction and CPAP either side.
- Sized from sex, height, CT bronchial diameter: 35–37 French for most women,1 about 29 cm deep at her height.2
- Scope both lumens, because listening misses malposition: tracheal, the carina with the blue bronchial cuff just below in the left main; bronchial, the left upper and lower lobe bifurcation.
- Cuff inflated 1 mL at a time under vision; rescoping after positioning and any movement, as turning and neck flexion move it 1–2 cm.
- Difficult airway: bronchial blocker through a single-lumen tube, as a double-lumen tube is harder to place and exchange.
Breaking down the answer
- Absolute indications — protecting one lung from the other, as with infection or massive hemorrhage; controlling ventilation, as with a bronchopleural fistula or giant bulla; and unilateral lavage.1 Exposure for VATS, lobectomy and esophageal or thoracic aortic surgery is relative.
- Left over right — the right upper lobe bronchus arises only about 1.5–2 cm from the carina,1 so a right tube malpositions easily. Right tube: left pneumonectomy or sleeve resection, a tumor or aneurysm compressing the left main bronchus, a left stent or disruption.2
- Size — 39–41 French for most men;1 needing more than 3 mL in the bronchial cuff means too small and migrating, sealing with less than 1 mL too large, risking injury.2 Depth is roughly 12 + height in cm / 10, about 29 cm at 170 cm.2
- Fiberoptic confirmation — bronchoscopy finds malposition in nearly half of tubes judged correct by auscultation,3 which is why the scope is the standard and not an extra.
- Bronchial blocker — the judgment test: a single-lumen tube, awake if needed, then the blocker. Trade-offs: slower collapse, no suction or CPAP to the operative lung, and dislodgement into the trachea, suddenly obstructing both lungs. Also suits patients already intubated, staying intubated, or small.
- Bronchial cuff volume — 1–3 mL, because overinflation causes bronchial rupture and herniation over the carina.1
- Postoperative ventilation — I exchange to a single-lumen tube over a tube exchanger, because the double-lumen tube is poorly tolerated and ICU staff are unfamiliar with it.
Follow-up question
After you turn her into the left lateral position and start one-lung ventilation, the peak pressure rises to 38 cmH2O and the SpO2 falls to 89%. What do you do?
Follow-up answer
HeadlineA tube that has moved until proven otherwise; I tell the surgeon I am checking it.
I go to 100% oxygen and look with the scope: the commonest cause is migration, so the bronchial cuff sits at the carina, or the tube has advanced into the lower lobe and is blocking the upper lobe. I reposition it under vision. If the SpO2 keeps falling, I return to two-lung ventilation while I fix it, then add CPAP of 5 cmH2O to the operative lung and optimize PEEP to the ventilated lung, reassessing pressures and saturation after each step. If the scope shows blood or a torn mucosa, I suspect bronchial injury and ask the surgeon to inspect the bronchus.
Pitfalls that cost points
- Confirming position by auscultation alone.
- Placing a double-lumen tube in a known difficult airway without a plan.
Rapid-fire
Q: Why does a blocker dislodge into the trachea? A: Surgical manipulation or positioning pulls the balloon back past the carina, where it occludes the trachea; I deflate it immediately.
Q: Why prefer a double-lumen tube for hemorrhage? A: It isolates faster and lets me suction the bleeding side, so blood does not flood the good lung.
Q: How do you isolate a patient with a tracheostomy? A: A blocker through the tracheostomy or a short double-lumen tube designed for stomas; standard tubes are too long.
Q: Why does a bronchial blocker suit lobar isolation? A: It can be placed in a lobar bronchus, preserving ventilation in the rest of the lung on that side.
Numbers to know
| Item | Value |
|---|---|
| Left DLT size, women | 35–37 Fr1 |
| Left DLT size, men | 39–41 Fr |
| Depth estimate | ~12 + height (cm)/10; ~29 cm at 170 cm2 |
| Bronchial cuff volume | 1–3 mL; >3 mL means too small2 |
| Right upper lobe takeoff | ~1.5–2 cm from carina1 |
| CPAP to operative lung | 5 cmH2O |
| Malposition missed by auscultation | ~46% of clinically "correct" tubes3 |
Links
- One-lung ventilation and hypoxemia, Massive hemoptysis, Bronchopleural fistula, Anticipated difficult airway and the ASA algorithm, Thoracic epidural analgesia
- Atlas: Monitor atlas: perioperative respiratory events
- European Association of Cardiothoracic Anaesthesiology (EACTA) recommendations on lung isolation
Sources
- 1.Double-Lumen Endobronchial Tubes · StatPearls, 2023 · statpearls.com
- 2.Double lumen endotracheal tubes for one lung ventilation · OpenAnesthesia · openanesthesia.org
- 3.Role of Fiberoptic Bronchoscopy in Conjunction with the Use of Double-lumen Tubes for Thoracic Anesthesia · Anesthesiology, 1998 · asa2.silverchair.comBronchoscopy found malposition in 79 of 172 (46%) tubes judged correct clinically.
Facts on this page were checked against these sources on Oct 14, 2026. Guidelines change; confirm doses against current institutional protocols.