Mediastinoscopy
Patient phenotype
Lung cancer patient for nodal staging, or mediastinal mass biopsy. Often: smoker, COPD, sometimes pre-radiation. Important: anterior mediastinal mass can be life-threatening — separate workup.
Procedure
Small suprasternal incision, blunt dissection along trachea into pretracheal space, sample paratracheal/subcarinal/right tracheobronchial nodes. ~30-60 min.
Anesthetic plan
GETA. STANDARD precaution: anterior mediastinal mass risk — pre-op ECHO + CT to rule out airway compression. RIGHT arm + leg BP/SpO₂ monitoring (innominate compression risk). Type & screen for vascular injury.
Setup
- ·Standard ASA monitors
- ·BP + SpO₂ on RIGHT arm (innominate vessel can be compressed by scope → R arm pulse loss = warning)
- ·PIV — left arm preferred (right arm is monitor)
- ·Type & screen 2 units (innominate injury possible)
- ·Sternotomy tray IN ROOM (not on field) — for emergency vascular control
- ·Cardiothoracic surgeon awareness if anterior mediastinal mass
Biggest concerns by phase
Anterior mediastinal mass — special workup
Anterior mediastinal mass + GA + supine = potential airway/vascular compression catastrophe. Pre-op CT must show mass relationship to airway/great vessels. ECHO if any cardiac involvement. Awake fiberoptic OR awake intubation in semi-Fowler if any concern. Femoral bypass standby if severe.
Standard induction unless mediastinal mass
Standard GA RSI usually OK. Maintain spontaneous ventilation if mediastinal mass (positive pressure can suddenly cause airway collapse). Have patient lie flat preop briefly to test for collapse.
Innominate vessel compression — RIGHT arm monitor
Mediastinoscope traversing through innominate area can compress innominate artery → loss of right arm pulse + cerebral circulation compromise (right carotid). RIGHT arm SpO₂ + BP catches this. Tell surgeon immediately if pulse loss.
Major vascular injury — sternotomy required
Innominate vessel laceration is a catastrophic complication. Treatment: surgeon packs, calls cardiothoracic, sternotomy for vascular control. Massive transfusion ready. Sternotomy tray in room.
Pneumothorax
Subcarinal dissection can perforate pleura. Watch for ↑PIP, ↓SpO₂, hemodynamic change. CXR post-op routinely.
Recurrent laryngeal nerve injury — voice check
Dissection near RLN can cause hoarseness postop (transient or permanent). Document voice on emergence.
Mock-defense scenarios
Practice answering these out loud. The probes show what an examiner is listening for.
Mediastinoscopy patient for lung cancer staging. Mid-case, you note the right arm SpO₂ has dropped from 99% to 85% over 30 sec. The left arm reads 99%. BP otherwise stable. What's happening and what do you do?
What an examiner probes for
- ▹Recognizes innominate artery compression by mediastinoscope
- ▹Tell surgeon immediately — adjust scope position
- ▹Verify with palpation of right radial pulse
- ▹Continue monitoring left arm + cerebral oximetry if available
- ▹If sustained: increase MAP (improves cerebral perfusion via collaterals)
Sources
- Miller's Ch 64 (thoracic)
- Slinger Anesthesia for Thoracic Surgery
Anatomy reference
Sourced reference images. 4 matches for "trachea mediastinum thoracic".
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