Airway, Monitors and Medications 101

Learner promise

By the end of this module you should be able to recognize the basic airway devices, name the standard monitors and what they measure, and match the major anesthetic medication classes to their general purpose - conceptually.

Who this is for: students who want to understand what they are seeing on the screens and in the airway. Not for: medication dosing or performing airway management. No doses are given here, and none should be inferred.

Why this matters

Half of what happens in anesthesia is on the monitors and at the airway. If you can read the room's screens and recognize the devices, the case stops being a mystery.

Airway overview (recognize, don't perform)

• Face mask - delivers oxygen and anesthetic gas; used to pre-oxygenate and ventilate.
• Supraglottic airway (e.g., LMA) - sits above the vocal cords; common for shorter, lower-risk cases.
• Endotracheal tube (ETT) - passes through the vocal cords into the trachea; used when a secured, protected airway is needed.

You are learning to recognize these, not place them.

Standard monitors and what they measure

• Pulse oximetry (SpO2) - oxygen saturation of the blood; the audible tone pitch tracks it.
• Capnography (EtCO2) - exhaled carbon dioxide; confirms ventilation and correct tube placement.
• ECG - heart rate and rhythm.
• Non-invasive blood pressure (NIBP) - the arm cuff that cycles automatically.
• Temperature - watched to prevent hypothermia.

Medication classes at a conceptual level (no doses)

• Induction agents - bring the patient from awake to anesthetized (e.g., propofol as a class example).
• Volatile/inhaled agents - maintain anesthesia via the breathing circuit.
• Opioids - manage pain and blunt the stress response.
• Neuromuscular blockers - relax muscles for intubation and surgical access.
• Reversal agents - restore muscle function or counteract specific medications at the end.

One-page monitor cheat sheet

• [ ] SpO2 - is oxygenation adequate? (listen to the tone)
• [ ] EtCO2 - is the patient being ventilated, tube in the right place?
• [ ] ECG - rate and rhythm normal?
• [ ] NIBP - blood pressure trending stable?
• [ ] Temp - patient staying warm?

Day-one pro tip

When the breathing tube goes in, watch for the EtCO2 waveform to appear on the monitor. That yellow trace is the confirmation the whole team is waiting for.

Reflection prompt

Which monitor would alert the team fastest if a breathing tube became dislodged, and why?

Faculty discussion prompt

Ask the anesthesiologist: "Which monitor do you trust most, and which can mislead you?"

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This module is for general education only. It is not medical advice, clinical credentialing, or permission to perform clinical tasks independently. Follow local institutional policy and the direction of your supervising clinicians.