Transtracheal Block Combined with Dexmedetomidine in ASA III Patients Undergoing Interventional Bronchoscopy: A Longitudinal Observational Study of Four Patients. JACR [Internet]. 2026 May 29 [cited 2026 Oct. 18];7(1):59-71. Available from: https://hmpublisher.com/index.php/JACR/article/view/959