Who knew there could be so much to glean from that little CO₂ waveform tucked away on your ICU monitor?! This week on Critical Care Time, Cyrus and Nick go Back to Basics and unpack end-tidal CO₂ and capnography—from the fundamentals to advanced bedside interpretation. We explore seven practical uses for capnography, including confirming tube placement, monitoring sedation, and guiding resuscitation, before digging into the physiology connecting metabolism, perfusion, and ventilation. Along the way, we explain why end-tidal and arterial CO₂ don’t always agree, decode shark-fin waveforms and other revealing patterns, and troubleshoot the equipment issues that can lead you astray. Whether you’re new to the ICU or looking to sharpen your skills, join us for practical bedside pearls, a healthy dose of physiology, and a surprisingly relevant detour into the world of seals, manatees, and “nature’s CO₂ retainers.” Buckle up! Once you are off the ride - shoot us a message or leave us a review and let us know how we’re doing!
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