Diagnostic Value and Safety of Addition of Transbronchial Needle Aspiration to Transbronchial Biopsy Through Endobronchial Ultrasonography Using a Guide Sheath Under Virtual Bronchoscopic Navigation for the Diagnosis of Peripheral Pulmonary Lesions.

Background: The diagnostic yield of peripheral pulmonary lesions (PPLs) through endobronchial ultrasonography with a guide sheath transbronchial biopsy (EBUS-GS TBB) under virtual bronchoscopic navigation is unsatisfactory because radial EBUS probe is not always located within the lesion. Transbronchial needle aspiration with a guide sheath (GS-TBNA) has the potential to overcome the lower diagnostic yield by improving the relationship between the probe and the lesion and enabling repeated sampling while maintaining the location of a GS near the lesion. However, there are few data regarding the diagnostic yield and safety for diagnosing PPLs in this procedure.

Methods: We retrospectively analyzed consecutive 363 lesions (83 lesions underwent GS-TBNA/EBUS-GS TBB and 280 lesions underwent EBUS-GS TBB) at our institution between April 1, 2019 and March 31, 2022. We investigated the diagnostic efficacy and complications of GS-TBNA/EBUS-GS TBB and compared them with those of EBUS-GS TBB.

Results: The lesion size, distance from the hilum, presence of bronchus leading to the lesion, and EBUS images during the examination differed significantly between the two procedures. Logistic regression analysis adjusted for these 4 covariates revealed that GS-TBNA/EBUS-GS TBB was a significant factor affecting the diagnostic success of PPLs compared with EBUS-GS TBB (odds ratio=2.43, 95% CI=1.16-5.07, P=0.018). Neither procedure differed significantly in terms of complications (6.0% vs. 5.7%, P>0.999).

Conclusion: GS-TBNA performed in addition to EBUS-GS TBB might be a promising sampling method for improving the diagnostic yield for PPLs without increasing the incidence of complications.