Shock is one of the most used words in emergency medicine. It’s also one of the most misunderstood.

In this episode, recorded at Trauma 2030 at the Royal College of Surgeons, I sit down with one of St Emlyn's own, Rich Carden — former emergency physician, now intensive care trainee and PhD graduate in trauma sciences — to explore what shock actually means beyond the blood pressure reading.

We discuss:

• Why shock is fundamentally about oxygen delivery and utilisation at a cellular level
• The difference between pressure and perfusion
• The concept of the “dose” of shock — magnitude and duration
• Why haemorrhage may only be the first phase
• How trauma patients transition between haemorrhagic, inflammatory, vasoplegic and septic states
• The glycocalyx — and why losing it matters
• The risks of early vasopressors in an empty system
• Why doing the basics exceptionally well remains our best intervention

This is not a protocol episode. It’s a physiology conversation. A systems conversation.
A reminder that restoring a number is not the same as restoring oxygen to mitochondria.

If you’re interested in pre-hospital and trauma systems thinking, do take a look at Tactical Trauma — spaces where these ideas are tested in practice.

Learning from podcasts?

If podcasts form part of your CPD, you can log your listening time across all podcasts on MedPod Learn — not just St Emlyn’s — and generate structured reflection. The app is free to download, includes a one-month free trial, and offers globally adjusted pricing.

Trauma 2030

TRAUMA 2030 united experts and innovators to shape the future of trauma care. Over two days, it explored breakthroughs in science, systems, and frontline practice, fostering collaboration across disciplines. The symposium aimed to inspire research, inform policy, and build a bold roadmap for trauma care worldwide.

As always, thanks for listening.