Preoperative assessment mnemonic

ASA physical status classes I to VI

The mnemonic

Happy Mice Seldom Chase Marching Beetles

What each word stands for

  • HappyI — normal healthy patient
  • MiceII — mild systemic disease
  • SeldomIII — severe systemic disease
  • ChaseIV — constant threat to life
  • MarchingV — moribund, not expected to survive without surgery
  • BeetlesVI — brain-dead organ donor

Why it matters clinically

Used to communicate perioperative risk; add E for emergency.

Where it stops being reliable

A broad risk grade that does not account for the type of surgery.

Teaching aid, still awaiting independent review. Confirm facts in a standard source.

More mnemonics

Common questions

What is the Preoperative assessment mnemonic?

Happy Mice Seldom Chase Marching Beetles. It helps you recall: ASA physical status classes I to VI.

What does "Happy" stand for?

I — normal healthy patient

What does "Mice" stand for?

II — mild systemic disease

What does "Seldom" stand for?

III — severe systemic disease

What are all the parts of the Happy Mice Seldom Chase Marching Beetles mnemonic?

Happy: I — normal healthy patient; Mice: II — mild systemic disease; Seldom: III — severe systemic disease; Chase: IV — constant threat to life; Marching: V — moribund, not expected to survive without surgery; Beetles: VI — brain-dead organ donor.

Which topic does this mnemonic belong to?

It belongs to Preoperative assessment in Anaesthesia.

Where does this mnemonic stop being reliable?

A broad risk grade that does not account for the type of surgery.

How is this useful clinically?

Used to communicate perioperative risk; add E for emergency.

How do I make this mnemonic stick?

Say it aloud, write it from memory tomorrow, then again in a week. Then test yourself on a Anaesthesia question about Preoperative assessment.

Is this a standard mnemonic?

It is a teaching aid written or adapted by our team. Some resemble ones students share informally. Check any fact that matters in a standard source.