Endoscopic Mucosal Injection Versus Ultrasound-Guided Injection of Triamcinolone to Treat Subglottic Stenosis

Inclusion Criteria: * 1: "Diagnosed with subglottic stenosis through laryngoscopic examination or imaging studies such as CT." * 2: "Experiencing symptoms related to subglottic stenosis, such as breathing difficulties, hoarseness, etc." Exclusion Criteria: * 1: "Severe cardiopulmonary dysfunction, patients extremely debilitated and unable to tolerate the procedure." * 2: "Patients allergic to lidocaine, midazolam, triamcinolone, or any of their components." * 3: "Pregnant or lactating women." * 4: "Unstable angina, congestive heart failure, severe bronchial asthma." * 5: "Severe hypertension and arrhythmias, hemodynamically unstable, and severe respiratory failure (PaO2 \<60mmHg after oxygen therapy or mechanical ventilation)." * 6: "Known coagulation dysfunction, inability to stop anticoagulants, antiplatelet agents, aspirin, or nonsteroidal anti-inflammatory drugs before treatment." * 7: "Patients do not agree to participate in this study." * 8: "Participation in other studies within the last three months and not withdrawn or concluded, or having received triamcinolone treatment less than 1 month ago." * 9: "Researchers believe there are any circumstances making the patient unsuitable for inclusion."