123. Describe airway-preserving posture positioning / List upper airway signs October 25th, 2007 by reuben in airway, resus Back Top Tags: card 122. When is cyanosis visible? / What causes a left shift in the hemoglobin-oxygen dissociation curve? 124. Centor criteria for strep throat / Tests to consider in sore throat Leave a Reply Cancel reply Please post any discussion to the emupdates Reddit page.