A square wave means present. End-tidal says, here. Most days, that is enough: my hand on the circuit, my eyes on the numbers, my voice low and ordinary: You’re doing well. Keep breathing. I am the anesthesiologist at the head of the bed, the one who borrows breath and returns it warm. Then one evening a cough arrived. Not the small cough of apology, not the winter throat-clearing that asks permission to pass. A hard, bright bark that emptied the room. Scan. Stillness. The ring above me white and indifferent. The report was one sentence. Nodule. I had said the word before to people in thin gowns, phones locked in their hands. Common. Often benign. We will follow it. On my own image it offered no reassurance, only a dot that bent the week around it: another scan, another wait, the long hallway between probably and proven. I made lists. Surveillance. Biopsy. Resection. For once there was no induction agent, no backup airway, no second IV— only choices, each with its own cost. Then the simplest question: What matters most to you? That night I stood at my children’s doors and listened the way I listen after extubation, waiting for the next breath to prove itself. I wanted an end to the interval. So I chose a date. In preop the cuff tightened, the oximeter found a pulse, the monitor wrote me down in green light. All of it familiar. That was the strangest comfort. In the room a time-out was called. Name. Procedure. Side. The litany that keeps us safe by making us look again. I wanted a time-out for the mind. Stop. Confirm. This is not happening. Cold prep. Blue drapes. A mask near my face. Then propofol turned language to snowfall. When I woke, pain made each deep breath a decision. Later, pathology returned with no interest in training, in titles, in the calm voice I use for others: malignant. Work resumed. It always does. Another patient lay under the lights, hands gripping the sheet. “I’m afraid,” they said. Before, I might have answered too quickly, might have reached for reassurance the way we reach for tape or suction, something ready, something useful. Instead I held the mask a moment longer. Not to promise. Not to fix. Only to stay until their breathing found my hands. A square wave means present. End-tidal says, here. And sometimes, before sleep, before certainty, before the room lets go, here is what we have to give.
Wei et al. (Fri,) studied this question.