Abstract
BackgroundThe knowledge of the mediastinal lymph node positions from an intrabronchial view was important for conventional transbronchial needle aspiration (TBNA). The introduction of endobronchial ultrasound guided transbronchial needle aspiration (EBUS-TBNA) changed the focus from the intrabronchial landmarks to the real life ultrasound images. However when all EBUS reachable lymph nodes are evaluated (mapping), the knowledge of the intrabronchial positions is crucial. The objective of this study was to present a new expert opinion map from an intrabronchial perspective validated by an interobserver variation analysis.MethodsPhysicians who had performed more than 30 EBUS-TBNA were included. They marked areas for optimal TBNA sampling on standardized pictures from an intrabronchial perspective. Areas marked by more than 3 of the 14 experts who had performed more than 1000 EBUS provided the data for the map. The map was validated among the experts and the agreement was compared to the agreement among less experienced physicians.ResultsThere was high agreement (>80 %) among the experts in lymph node positions 4 L, 7, 10 L, 11R and 11 L. The agreement for 4R and 10R was low (<70 %). The agreement among the most experienced physicians was significantly higher than the less experienced physicians in station 10 L (92 % vs. 50 %, p:0.01).ConclusionsIt was possible to present a new map of expert opinion for optimal sampling positions in lymph node stations 4 L, 4R, 7, 10 L, 11R and 11 L. All positions except 4R had high agreement. No area was covered by more than 3 of the 14 experts in station 10R.
Highlights
The knowledge of the mediastinal lymph node positions from an intrabronchial view was important for conventional transbronchial needle aspiration (TBNA)
Conventional TBNA was performed based on the knowledge of the lymph node positions from an intrabronchial perspective [3] and later guided by the computer tomography (CT) scan for each patient [4]
1/3 of the physicians worked in centers with more than 500 Endobronchial ultrasound (EBUS)-TBNA procedures yearly, 1/3 worked in hospitals with less than 150 EBUS-TBNA procedures yearly
Summary
The knowledge of the mediastinal lymph node positions from an intrabronchial view was important for conventional transbronchial needle aspiration (TBNA). The introduction of endobronchial ultrasound guided transbronchial needle aspiration (EBUS-TBNA) changed the focus from the intrabronchial landmarks to the real life ultrasound images. When all EBUS reachable lymph nodes are evaluated (mapping), the knowledge of the intrabronchial positions is crucial. Vital to the staging and determination of resectability is assessment of the hilar and mediastinal lymph nodes. Conventional TBNA was performed based on the knowledge of the lymph node positions from an intrabronchial perspective [3] and later guided by the computer tomography (CT) scan for each patient [4]. Endobronchial ultrasound guided transbronchial needle aspiration (EBUS-TBNA) has gradually replaced conventional TBNA.
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