Am I Using Cut or Coag?

Cut to the Chase: General Surgery Survival Series — Post 10

The Bovie pencil is in your hand.

The attending says, "Go ahead. Buzz that bleeder."

Your foot finds a pedal you have never pressed in your life. The cautery is set to something. You do not know what something means.

There is a question forming somewhere in the back of your head that you have not asked out loud.

Is this on cut or coag?

You think the attending changed the setting earlier in the case. You are not sure. The numbers on the generator do not mean anything to you. The bleeder is right there. The room is waiting.

Most trainees keep that question internal. They activate and hope.

Move the question outside your head.

"Is this set on coag?"

That is one sentence. It costs nothing. The attending answers in three seconds. Now you know what the pedal is going to do when you press it, instead of guessing.

The three modes are not interchangeable. Cut delivers a continuous waveform that vaporizes tissue with minimal lateral thermal spread. It cuts cleanly and seals almost nothing. Coag delivers an interrupted waveform that builds heat slowly, denatures protein, and seals small vessels. It coagulates well and cuts poorly. Blend sits between them. The generator interrupts the waveform less than coag does, which lets you cut through tissue while sealing small bleeders along the way. On the generators you'll see most often, the yellow pedal is cut and the blue pedal is coag. Blend lives on the cut side, selected on the device or the touchscreen.

The wrong setting on a small bleeder is a mess that did not need to happen. Cut on a vessel that needed coag will not stop the bleeding. Coag on a clean fascial division will char tissue and slow the case. Blend on something the attending wanted cleanly cut will leave a margin nobody wants to look at later.

That moment is not unique to the Bovie. It happens with the trigger of a stapler, the pedal of an energy device, the first throw of a knot you have only practiced on a board. The voice in your head says don't make this weird, just press it, you can figure it out. That voice has nothing to do with the patient. It has everything to do with how badly you want to be the trainee who did not have to ask.

The right move is one sentence, said before anything is pressed or fired or tied.

"I haven't used one of these. Can you walk me through it?"

No apology. No speech. Just the truth.

Pearl: The dangerous moment is not being unfamiliar. It is being unfamiliar and acting familiar.

The attending already made the calculation before handing it to you. They believe you can probably do it with guidance. They are not handing you a live grenade. They are inviting you in. The invitation requires you to be honest about what you know.

The same rule applies to knots. Trainees underestimate knot anxiety because the motion looks small. It is not small when tissue is under tension and your tie is what controls the bleeding. A square knot on a suture board is not a ligature on a real vessel with a wet strand and something important underneath it. Say so before you start tying. A loose knot is not humility. It is a problem someone else has to fix.

Devices hide risk in ways a clamp does not. Thermal spread is invisible. A staple misfire is not reversible. A clip at the wrong angle looks fine until it does not.

If the working end goes out of view, stop. "I'm going to pause until I can see the tip" is a complete sentence. Use it whenever you need it.

Mid-residency, an attending handed me a stapler on a bowel resection and said fire it. I had watched it fire a handful of times. I knew where the trigger was. I had no idea how to confirm staple height, whether the jaws were fully closed on tissue, or what to check before the moment of no return.

I almost just squeezed.

What came out of my mouth instead was, "I haven't fired one of these. Can you walk me through it?"

He did not take it back. He stood next to me, named each step, watched me close the jaws, watched me fire. The staple line was clean. The case finished without drama.

What I learned that day was not how to use a stapler. It was that the moment between the device landing in my hand and my mouth opening was the actual decision point. He had handed it to me knowing I might not have done it. What he was waiting to see was whether I would say so.

Pearl: The most dangerous moment is not ignorance. It is ignorance covered by urgency.

When you tell me you have not done something, I do not hear failure. I hear calibration.

What makes the room uneasy is not newness. It is mismatch. A trainee activating energy while the tip is off screen. An intern firing a stapler because the room seemed ready.

Your level is not the problem. A false level is.

I am not watching what you know.

I am watching what you say when you don't.

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What to Read Next: Post 11 — Am I Too Slow? Once you start naming what you don't know, the next anxiety arrives almost on schedule: the suspicion that everyone in the room moves faster than you do.