The Feynman Technique for Nursing School: Teach It Back to Find the Gaps

The Feynman technique, named for the physicist Richard Feynman, is simple: explain an idea in plain words as if teaching someone new to it. Wherever you stall, reach for jargon or wave your hands, you have found the part you do not actually understand. Fix that part and explain again.

It is a great method with one weakness when you study alone: nobody tells you where the gaps are. NurseSavvy’s Feynman teach-back mode is that listener.

A real teach-back, start to finish

The question: a patient with a nasogastric tube on suction for three days has an ABG of pH 7.50, PaCO2 47, HCO3 35. The student chose to clamp the tube. The right answer is to check the potassium and the cardiac rhythm. Ada never explains the chain. She asks for it a link at a time:

Ada

AI tutor · Med-surg · fluids, electrolytes & renal · Feynman teach-back

The question: A client has had a nasogastric tube to low intermittent suction for 3 days after bowel surgery. The client is alert, respirations are 12/min and unlabored, and SpO2 is 96% on room air. ABG: pH 7.50, PaCO2 47 mmHg, HCO3 35 mEq/L, PaO2 90 mmHg. Which action should the nurse take next?Show the answer choices

1. A.Clamp the nasogastric tube to stop further loss of gastric acidstudent picked
2. B.Review the serum potassium level and the cardiac rhythm ✓
3. C.Coach the client to breathe deeply to lower the PaCO2
4. D.Coach the client to slow the breathing to retain carbon dioxide

I got this one wrong. Help me understand it.

Imagine explaining this to a classmate who has never seen a case like this. In your own words, why is this client's pH pushed above 7.40 in the first place?

The suction keeps pulling stomach acid out, so the body is losing acid and the blood turns basic.

Right, losing stomach acid is what pushes the pH up. The gap is that the fluid being suctioned out is mostly hydrochloric acid, so the body is losing acid and keeping its base. Look at the HCO3 of 35. What does that number tell you about the base in this client's blood?

It's high, so there's too much base. Metabolic alkalosis.

Yes, a high HCO3 with a pH above 7.40 is metabolic alkalosis. The gap is the PaCO2 of 47, which is above normal. In your own words, what is the lungs' job when the blood has too much base?

Breathe slower to hold on to CO2, which is an acid. So the 47 is the lungs compensating.

The lungs hold onto CO2 so the blood's acid-base balance shifts back toward normal, which is why the PaCO2 is high. If the client breathed deeply and blew off that CO2, what would happen to the pH?

The pH would climb even higher. So coaching deep breathing makes it worse.

Right, blowing off CO2 would push the pH higher, so deep breathing is the wrong move. Now the key question: the correct answer is about potassium. In your own words, how does this alkalosis lower the client's potassium?

Hydrogen shifts out of the cells to replace the lost acid, and potassium moves into the cells in exchange. The suction drains potassium too. Low potassium can cause dysrhythmias, so check the K and the rhythm.

Your potassium chain is solid: alkalosis pulls potassium into cells, and suction drains it too. To wrap up, the nurse checks K and the rhythm first, because clamping the tube, your first pick, needs a prescription and risks distention and vomiting.

Six turns, and the student explained every link: suction removes acid, the bicarbonate climbs, the lungs compensate by holding CO2, deep breathing would make it worse, and the alkalosis plus the suction drop the potassium, which threatens the rhythm. Ada’s job was to confirm what was solid, name the one gap, and ask for the next link. The wrap-up only arrives once the student has built the whole thing.

How the mode is built

• The first turn sets the scene in one line and asks for the first link in the reasoning, in your own words.
• Each reply gets one short sentence on what is solid or the one gap, then the next single question.
• About 35 words a turn, working toward why the correct answer is right.
• A one- or two-sentence wrap-up at the end, after you have done the explaining.

Why explaining it teaches you

Learning by teaching. Fiorella and Mayer (2013) found that students who explained material to others after studying it learned it better than students who only studied, and the benefit held at a delayed test. Explaining forces you to organize the idea instead of recognizing it.

Generation. Ideas you produce are remembered better than ideas you read (the generation effect, Slamecka and Graf, 1978). In teach-back you produce nearly every idea.

It exposes the illusion of knowing. Rereading a rationale makes it feel familiar, and familiar feels like understood. Being asked to explain it shows the difference in one turn.

When to use Feynman teach-back

Use it on the topics that feel fine until an exam proves otherwise: acid-base, fluid shifts, potassium, heart failure, anything with a chain of cause and effect. It is also the best check on a question you got right: if you cannot teach it back, you guessed well. Pair it with the free ABG simulator walkthrough, where Ada moves the numbers so you can see each link in the chain you just explained.

The other four modes: Explain simply, Socratic, Compare & contrast, Clinical reasoning. Or start with the overview of the NurseSavvy tutors.