Before the procedure begins, your oxygen levels will be measured using a device placed on your finger called a pulse oximeter, which measures peripheral oxygen saturation (SpO₂).

You will then receive oxygen through a mask to prepare your body for the procedure. This step is called pre-oxygenation.

After pre-oxygenation is complete, your oxygen levels will be measured again.

You will receive an injection of propofol at a concentration of 10 milligrams per milliliter. This medication will put you to sleep for the surgery.

You will also receive an injection of rocuronium bromide at a concentration of 10 milligrams per milliliter. This medication temporarily relaxes your muscles to allow the breathing tube to be inserted more easily.

The dose of rocuronium bromide you receive will be calculated either based on your ideal body weight (a standard weight for your height) or your real body weight (your actual current weight), depending on which group you are assigned to in the study.

After the rocuronium injection is given, the intravenous line will be flushed with sodium chloride 0.9% solution to ensure all medication enters your bloodstream.

Approximately 45 seconds after the medication line is flushed, the medical team will assess the level of muscle relaxation using a device that delivers small electrical signals to measure your muscle response. This is called train-of-four (TOF) monitoring.

The breathing tube will then be inserted into your windpipe through your mouth. This procedure is called endotracheal intubation.

The time from when the rocuronium injection line is flushed until the breathing tube is confirmed to be in the correct position will be measured.

The tube placement will be confirmed by a device that detects carbon dioxide in your exhaled breath, called capnography.

If needed, additional techniques may be used to improve the view of your airway, such as gentle pressure on the outside of your throat or use of a special guide wire called a bougie.

Throughout the intubation process, your oxygen levels will be continuously monitored. The lowest oxygen level reached during this time will be recorded.

Your blood pressure and heart rate will also be monitored to detect any changes.

The quality of the intubation conditions will be assessed using a standardized scale called the Fuchs-Borgeat scale, which rates conditions as excellent, good, or poor based on factors such as jaw relaxation, vocal cord position, and your response to tube insertion.

Any complications that occur during the procedure will be documented, including breathing-related events such as low oxygen levels or airway spasm, and blood pressure changes.

Once the breathing tube is successfully placed and confirmed to be in the correct position, your scheduled surgery will proceed as planned.

The breathing tube will remain in place throughout your surgery to ensure you receive adequate oxygen and anesthesia.