Margin is medicine

Why clear thinking is a safety issue, not a soft skill.

In the summer of 2023 I resigned from the consultant post I had spent twenty years earning.

Not because I had stopped loving cardiology. I loved it still. I resigned because I could no longer think properly inside it, and a cardiologist who cannot think clearly is a hazard wearing a lanyard.

Nobody collapses in a heap. That is the part people misunderstand. You do not run out of intelligence. You run out of something quieter. Room. The half-second before you speak. The willingness to ask the awkward question on the ward round. The capacity to hold two possibilities open when everyone in the room wants you to close them down and move on.

I started calling that quiet thing oxygen, because it behaves like oxygen. You only notice it when it runs low, and by then your judgement is already slurring.

This publication is about Cognitive Oxygen® (COx): the conditions that wise action depends on, and what it takes to protect them when the pressure will not stop.

Here is what I have learned, first as a clinician and then as a coach. Three things go before anyone sees them go.

Judgement goes first. Tired leaders do not make obviously stupid decisions. They make subtly worse ones, faster, with more confidence. The confidence is the tell. Pressure pushes people towards certainty exactly when the situation is calling for clarity, and certainty under complexity is not strength. It is a smaller version of the truth, wearing a louder voice.

Humanity goes second. The person who used to listen starts interrupting. The leader who used to ask starts telling. Not because they became unkind, but because kindness is metabolically expensive and they have run out of margin to pay for it. I have watched good doctors become difficult to work with inside a single bad winter, and I have been one of them.

The truth goes last, and it goes silently. This is the dangerous one. When a leader runs low, the people around them quietly decide it is no longer safe to bring bad news. The corrections stop. The early warnings stop. The leader experiences this as calm and reads it as competence. It is neither. It is the sound of a team that has stopped telling you what you most need to hear.

None of this is a character flaw. That is the whole point. It is a predictable response to depleted conditions, and conditions can be protected. We protect oxygen for patients without a second thought. We have never thought to protect it for the people making the decisions.

So that is the work. Three commitments, said plainly. Protect judgement, so decisions stay sound when the stakes are high. Preserve humanity, so the team stays whole and stays honest. Generate usable clarity, so people can orient and act inside the fog rather than pretending the fog has lifted.

I will not pretend this is gentle. Some of what I write will sit uncomfortably with how leadership is rewarded in healthcare, where stamina is mistaken for strength and the leader who admits they are running low is read as the weak one. I think we have that exactly backwards. The leader who can see their own oxygen falling, and say so, is the safest person in the building.

I called the principle margin is medicine before I fully believed it. I believe it now. The margin you keep, the half-second you protect, the awkward truth you make it safe to say, these are not the soft edges of the job. They are the clinical core of it.

You did not run out of talent. You ran out of air.

Let me show you how to get it back.