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How do you prepare to induce general anesthesia in two minutes? You’re called to induce anesthesia for a patient being rushed to the operating room for emergency surgery. You arrive at the operating room only minutes before the patient is scheduled to arrive. I recommend you use the mnemonic M-A-I-D-S as a checklist to prepare yourself and your equipment.
M stands for MACHINE and MONITORS. Check out your anesthesia machine first. Determine the oxygen sources are intact, and that the circle system is airtight when the pop-off valve is closed and your thumb occludes the patient end of the circle. Make sure the anesthesia vaporizer liquid anesthetic level is adequate. Check out your routine monitors next. Determine that the oximeter, end-tidal gas monitor, blood pressure cuff, and EKG monitors are turned on and ready.
A stands for AIRWAY equipment. Make sure an appropriate-sized anesthesia mask is attached to the circle system. Determine that your laryngoscope light is in working order. Prepare an appropriate sized endotracheal tube with a stylet inside. Have appropriate-sized oral airways and a laryngeal mask airway (LMA) available in case the airway is difficult. Make sure you have a stethoscope so you can examine the patient’s heart and lungs.
I stands for IV. Have an IV line prepared, and have the equipment to start an IV ready if the patient presents without an intravenous line acceptable for induction of anesthesia.
D stands for DRUGS. At the minimum you’ll need an induction agent (e.g. propofol or etomidate) and a muscle relaxant (succinylcholine or rocuronium), each loaded into a syringe. You’ll need narcotics and perhaps a dose of midazolam as well. Cardiovascular drugs to raise or lower blood pressure will be available in your drug drawer or Pyxis machine.
S stands for SUCTION. Never start an anesthetic without a working suction catheter at hand. You must be ready to suction vomit or blood out of the airway acutely if the need arises.
For pediatric patients the M-A-I-D-S mnemonic is followed, but in addition the size of your anesthesia equipment must be tailored to the age of the patient. Let’s say your patient is 4 years old. For M=MACHINE, you may need a smaller volume ventilation bag and hoses. For M=MONITORS, you’ll need a smaller blood pressure cuff, a smaller oximeter probe, and a precordial stethoscope if you use one. For A=AIRWAY, you’ll need smaller endotracheal tubes and airways. For I=IV, you’ll need smaller IV catheters and IV bags.
As a last-second check before a pediatric anesthetic, I recommend you pull out each drawer on your anesthesia machine, and then on your anesthesia cart, one at a time. Scan the contents of each drawer to ascertain whether you need any of the equipment there before you begin your anesthetic.
If you have any suspicion that the patient’s airway is going to be difficult, I recommend you ask to have a video laryngoscope and a fiberoptic laryngoscope brought into the operating room.
Once the patient arrives, utilize time to assess the situation as any doctor does. Take a quick history and perform a pertinent exam of the vital signs, airway, heart, lungs, and also a brief neuro check. Assist in positioning the patient on the operating room table, supervise the placement of routine monitors, and begin preoxygenating the patient. Induce anesthesia when you are ready.
Never be coerced to rush an anesthesia induction if your anesthesia setup or the patient’s physiology are not optimized. And always utilize the mnemonic M-A-I-D-S as an anesthesia checklist to confirm that your equipment is ready.
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