Wilderness Medicine Podcast September 2019 - Wilderness & Environmental Medicine Live
Sep 4, 2019
David J. Farstad, an expert on cold water immersion syndrome, discusses the critical risks of cold exposure during outdoor activities and shares preventive strategies for enthusiasts. Jake McRae, a medical student and search-and-rescue member, reveals how drones were pivotal in a high-altitude rescue, showcasing their capability in challenging environments. Both guests highlight the evolving nature of wilderness medicine and its integration with advanced technology, emphasizing safety and innovative solutions in the field.
AI Snips
Chapters
Transcript
Episode notes
Syndrome Occurs At Warmer Temps Than Expected
- Research from the University of Portsmouth indicates cold immersion responses occur at or below about 20–25°C, not only at extremely cold temps.
- The diving reflex threshold overlaps this temperature range, linking multiple reflexes to risk.
Hyperventilation Risks: Aspiration Over Blackout
- Hyperventilation during cold shock can lower arterial CO2 and increase aspiration risk but is unlikely to cause classic hypocapnic 'shallow-water blackout' immediately.
- Aspiration from the initial gasp may still precipitate hypoxic syncope and drowning.
Emotion-Linked Arrhythmias Can Be Fatal
- Extreme emotional states and startle reactions can trigger ventricular arrhythmias via autonomic imbalance.
- Such arrhythmias may explain sudden arrests in apparently healthy individuals during cold immersion.