Verbal Breathing Coaching to Improve Preoxygenation and Extend Safe Apnea Time in Anesthesia

This study looks at a simple but meaningful question: can the way the investigators talk to participants-and guide their breathing-make anesthesia safer? Before induction, participants are usually asked to breathe oxygen through a mask, but many do so in a shallow or irregular way due to anxiety or lack of guidance. Here, the investigators introduce a calm, structured approach where participants are gently coached to take slow, deep breaths with controlled inhalation and prolonged exhalation, helping them feel more relaxed and engaged in their own care.

the investigators included 120 adult participants scheduled for elective surgery, all relatively healthy (ASA I-II), and divided them into two groups. One group received the usual instructions to "breathe normally," while the other group was guided step-by-step with simple verbal cues to regulate their breathing pattern. This small change transforms a passive process into an active, patient-centered interaction, potentially improving how effectively oxygen fills the lungs before anesthesia.

the investigators main focus is on "safe apnea time"-how long a patient can maintain adequate oxygen levels after induction before desaturation begins. the investigators also look at additional factors such as oxygen concentration at the end of preoxygenation, changes in blood pressure and heart rate, and even how anxious the participant feels before going to sleep. These measures help the investigators understand not only the physiological benefits but also the emotional impact of this approach.

Inclusion criteria

• Scheduled for elective surgery under general anesthesia with tracheal intubation.
• BMI < 35 kg/m²
• The Ability to understand and follow verbal instructions

Exclusion criteria

• Patients with an anticipated difficult airway
• Significant cardiopulmonary disease
• Pregnancy
• Emergency surgery
• Pre-existing hypoxemia (SpO₂ < 94% on room air)
• Use of sedative premedication affects respiratory drive.