Today in the OR, the anesthesiologist shared with me his "Coffee Cup Rule" for ETCO2 obstruction in the airway. If it looks like a cup of coffee placed on top of the ETCO2 wave would slide off = clinically significant obstruction. @RickTumminello #Diagnosis #Capnography #ETCO2 #EndTidalCO2 #CoffeeCup #Rule #Waveform #Interpretation #pulmonary