An intern asked me once how long you're supposed to listen. A full minute was the easy half of her question. The other half was how long she was allowed to stay in the room.

A liter of fluid will raise almost anyone's blood pressure for a while, which is exactly the problem with it. An attending's walkthrough of postoperative hypotension: how to tell a real number from a cuff artifact, what perfusion looks like under your hand, why the bolus is a test rather than a gesture, and what a transient responder is telling you.

An intern called me at two in the morning and apologized before she said anything else. She had the finding. She'd had it for four hours. What she didn't have was a word for it, and she nearly let that decide whether to pick up the phone. An attending on night float: why the dangerous miss is the thing you had a good reason for, how to narrow nineteen patients down to three, and why "I can't explain this" is a complete sentence.

The day team leaves, and nineteen patients you didn't operate on are yours until morning. An attending's guide to surgical cross-cover: sorting the page from the workroom, reading the trend instead of the number, treating the nurse's read as data, getting to the doorway before the chart, and calling your senior before you're comfortable. Night float has never been a knowledge test. It's a triage problem with a phone attached.