Mediastinoscopy
Stem
A 64-year-old man, 78 kg, with a right upper lobe adenocarcinoma is scheduled for cervical mediastinoscopy to stage enlarged right paratracheal (4R) and subcarinal nodes after a non-diagnostic EBUS. He smokes, has treated hypertension, and lies flat without symptoms; CT shows no tracheal compression. His hemoglobin is 14 g/dL.
Question
How will you set up his monitoring and access, and what complications are you preparing for?
Ideal answer
HeadlineSudden major bleeding and scope compression of the innominate artery shape my setup: pulse oximeter right hand, blood pressure cuff left arm.
- Right-hand pulse oximeter, because the scope can squeeze the innominate artery against the sternum, and its pleth is my early warning.
- Left-arm cuff; any arterial line in the right radial. The left cuff reads true systemic pressure when the right is compressed;1 I read the line against it.
- Two large-bore IVs, blood crossmatched,2,1 because bleeding here is rare but sudden.
- General anesthesia, tube, relaxation; circuit secured. He must be still as tracheal and carinal stimulation comes and goes;1 neck extended, table turned away.1
- Hemorrhage first, as the most serious; then the rest: pneumothorax, checked before he leaves, recurrent laryngeal and phrenic nerve injury, esophageal injury, tracheal compression and air embolism.2
Watch for: Right pleth, airway pressure, the field.
Breaking down the answer
- Why right pleth, left cuff — the innominate artery feeds the right subclavian and right carotid; losing the right pleth with a normal left cuff means compression and a risk of right-hemisphere stroke.1
- Raise the pressure if compression cannot be relieved — when the surgeon cannot move the scope, for example while controlling bleeding, I raise mean arterial pressure to drive collateral flow to the right hemisphere.1
- Which arm for the IV — one source recommends the right arm, because the left innominate vein may be compressed;1 with a venous injury in the chest I add a lower-extremity line so fluids do not leak out through the tear.
- Bleeding is rare but sudden — in one series of 3,391 cases, major bleeding occurred in 0.4%, the 4R station was the commonest biopsy site, the azygos vein, innominate artery and pulmonary arteries were injured, and packing gave initial control in 13 of 14.3
- The mass changes everything — a large anterior mass or tracheal compression would make me plan awake intubation or spontaneous ventilation, with a rigid bronchoscope and an experienced bronchoscopist ready before induction.2
- Look for the quieter complications — a hoarse voice suggests recurrent laryngeal injury; hypoxemia with rising airway pressure suggests pneumothorax.2
Follow-up question
During biopsy of the 4R node, dark blood wells up the scope, the field fills, and his blood pressure falls to 72/40 with a heart rate of 125. What do you do?
Follow-up answer
HeadlineMajor hemorrhage, most likely azygos or a great vessel; I say so, have the surgeon pack through the scope, and call for help.
Venous or arterial, packing gives initial control in most cases.3 Help means a second anesthesiologist, the massive transfusion protocol and a cardiothoracic surgeon. Blood and fluid go through my large-bore line, with a femoral or lower-extremity line in case the superior vena cava is torn,2 plus vasopressors, 100% oxygen and a rapid infuser. If packing fails, the surgeon explores, most often through a sternotomy, sometimes a thoracotomy.3 I reassess pressure, hemoglobin, coagulation and the right pleth every few minutes, and check for air embolism if the vein is open.
Pitfalls that cost points
- Calling the loss of the right pleth a probe problem.
- Having no blood typed and crossmatched for a "minor" procedure.
Rapid-fire
Q: What is mediastinoscopy used for now? A: Staging lung cancer and diagnosing mediastinal masses, though PET and EBUS have replaced much of it.2
Q: Where is the incision? A: A 2–3 cm transverse cut above the suprasternal notch.2
Q: What is the overall morbidity? A: About 2–8%.2
Q: Which vessels are injured in major bleeding? A: Most often the azygos vein, the innominate artery and the pulmonary arteries.3
Q: What does CT tracheal compression above 50% with mixed obstructive and restrictive PFTs predict? A: A likely need for reintubation after surgery.2
Numbers to know
| Item | Value |
|---|---|
| Overall morbidity | 2–8%2 |
| Major bleeding | 0.4% (one series of 3,391)3 |
| Initial control by packing | 13 of 143 |
| IV access | Two large-bore lines2 |
| Incision | 2–3 cm, suprasternal notch2 |
Links
Sources
- 1.Anesthesia for Thoracic Surgery: Mediastinal Operations (Clinical Anesthesia Procedures) · Unbound Medicine · anesth.unboundmedicine.comPublicly visible Mediastinoscopy section only; innominate artery compression and limb selection.
- 2.Mediastinoscopy: vascular compression · OpenAnesthesia (IARS) · openanesthesia.org
- 3.Management of major hemorrhage during mediastinoscopy · J Thorac Cardiovasc Surg (Park, Flores, Downey, Bains, Rusch), 2003 · synapse.mskcc.orgAbstract (PMID 14502145): 3,391 mediastinoscopies, major hemorrhage 0.4%; 4R the commonest biopsy site; azygos, innominate and pulmonary arteries injured; packing gave initial control in 13/14; sternotomy the commonest approach.
Facts on this page were checked against these sources on Oct 16, 2026. Guidelines change; confirm doses against current institutional protocols.