Balanced Analgosedation in Bronchoscopy: Propofol/Pethidine Versus Midazolam/Pethidine

The goal of this clinical trial is to compare the safety and efficacy of two pharmacological sedation regimens during bronchoscopy procedures in adult patients who require elective bronchoscopy. The main questions it aims to answer are: * Is propofol/pethidine analgesia administered by a pulmonologist as effective and safe as midazolam/pethidine in achieving adequate sedation during bronchoscopy, particularly in terms of desaturation rate? * Does the choice of sedative (midazolam vs. propofol) influence the occurrence of adverse events or need for escalated care?