FOAMfrat Podcast

In this episode of the FOAMfrat Podcast, we sit down with Joe Hylton, one of the go-to ventilator educators in critical care transport, to break down APRV in a way that actually makes sense. We move beyond surface level explanations and get into how APRV really works, why it is so effective for ARDS and severe hypoxemia, and how volumetric capnography can give you real-time physiologic feedback when titrating mean airway pressure and PEEP. This is not a "set it and forget it" APRV discussion. We dig into the mechanics, the physiology, and the bedside decision making that matters in transport and critical care environments. Topics covered in this episode: • How APRV differs from conventional pressure control ventilation • Why mean airway pressure is the real driver of recruitment • Using flow curves and time constants instead of guesswork • Volumetric CO₂ vs end-tidal CO₂ and why the difference matters • Identifying optimal recruitment and overdistension in real time • How VĊO₂ trends can guide PEEP and pressure adjustments • APRV pitfalls, misconceptions, and when paralysis may still make sense • Practical APRV setup on Hamilton ventilators for transport teams If APRV has ever felt like ventilator voodoo, this episode pulls the curtain back and ties the mechanical settings to what is actually happening at the alveolar and capillary level. Joe brings deep experience from working with Hamilton Medical systems, and the discussion is framed through real-world transport and ICU decision making, including insights relevant to teams like Life Link III and other critical care programs. This episode is ideal for: • Flight paramedics and critical care transport clinicians • ICU nurses and respiratory therapists • Medical directors and educators • Anyone who wants to understand APRV beyond memorized settings 🎧 Listen, learn, and rethink how you approach lung recruitment. Subscribe for more high-yield critical care and EMS education from FOAMfrat.

In this episode of the FOAMfrat Podcast, Dr. Harrison Brookeman joins the discussion to examine methemoglobinemia and the emerging prehospital threat of sodium nitrite ingestion. Often viewed as a rare toxicology concept, this condition is appearing more frequently and can progress rapidly with devastating consequences if it is not recognized early. The episode focuses on what matters most to EMS clinicians in the field: the physiology of methemoglobinemia, why these patients appear profoundly hypoxic despite adequate ventilation, and the classic clue: a pulse oximetry reading that remains fixed around 85 percent regardless of oxygen delivery. The conversation also addresses iatrogenic causes such as benzocaine exposure, expected mental status changes, and why oxygen alone does not correct the problem. Emphasis is placed on prehospital decision-making, including early involvement with poison control, transport destination considerations, and the importance of ensuring these patients are taken to the right facility the first time. This episode is intended to sharpen recognition, improve pattern awareness, and prepare providers for a call that does not follow typical respiratory failure patterns.

A little over a year ago, I made a short reel discussing ventilating a patient in a severe metabolic acidosis. In the video, I mentioned that minimal to no PEEP might be appropriate. Not because the patient doesn't need PEEP, but because the shortened cycle time at higher respiratory rates can unintentionally generate dynamic PEEP on its own. But what if it was intentional? What if the presence of a wider pressure when the ventilator switches into exhalation would cause the air to exit more rapidly? In this podcast, I discuss my thought process with respiratory therapist extraordinare, Melody Bishop @melodybishop_rt. She helps surface some definitions and distinctions to terms like air-trapping, Set PEEP, & auto-PEEP while we discuss ventilation strategies in metabolic acidosis. The blog below was what I had sent her before the podcast to get all my thoughts & illustrations down in writing. As always, please follow your local guidelines, and I hope you enjoy listening to the conversation.

Pelvic binders have long been considered a standard intervention in the management of suspected pelvic fractures in the prehospital setting. However, recent guidance from the National Association of EMS Physicians (NAEMSP) challenges some of the long-standing assumptions surrounding their use. In a recent FOAMfrat podcast episode, I spoke with Dr. John Lyng, editor-in-chief of the NAEMSP Trauma Compendium, to explore the evidence and rationale behind their newly released position statement on pelvic fracture management.

In this episode, Tyler sits down with Hanna Thompson to discuss a critical yet often overlooked topic in EMS—eating disorders. Drawing from personal experience and clinical insight, they explore how these conditions present both medically and behaviorally, especially in prehospital and interfacility transport settings. They break down the subtle physical signs that EMS providers can look for—such as Russell's sign, lanugo, unexplained bradycardia, and electrolyte disturbances—and emphasize the importance of sensitive history taking. The conversation also dives into the dangers of refeeding syndrome, slow correction strategies, fluid choice, and the clinical significance of thiamine, magnesium, and phosphate replacement. What You'll Learn: How eating disorders can manifest in EMS calls Why you may be treating the consequences, not the disorder itself Red flags like bradycardia, lanugo, and Russell's sign How to handle refeeding syndrome safely Why dextrose, fluids, and electrolyte replacement should be approached cautiously The connection between electrolyte shifts and seizures or arrhythmias Key Takeaway: Patients with eating disorders are medically and psychologically fragile. In EMS, we often encounter them through the effects of the disorder—not the diagnosis itself. Recognizing subtle clues and avoiding aggressive interventions could save a life. Resources Mentioned: Hannah's blog on EMS considerations in eating disorders Data on post-COVID spikes in eating disorder incidence Guidelines for electrolyte correction and refeeding syndrome Disclaimer: This podcast is for educational purposes only and not a substitute for clinical protocols or medical direction. Always consult your agency's guidelines and medical control.