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contentuptodate· Content· item f15_11_15538

©2013 UpToDate ® Print Email Comparison of airway resistance in a pediatric versus adult airway Effects of airway narrowing. Resistance to gas flow is inversely proportional to the fourth power of the radius of the airway lumen, meaning that small decreases in luminal diameter result in large increases in airway resistance. Because infants and children have smaller airways than adults at comparable levels, the same amount of airway narrowing (eg, 1 mm) results in a disproportionate increase in resistance for these patients. This problem is compounded by the fact that the immature respiratory musculature of a pediatric patient is less efficient and therefore more prone to fatigue than that of an adult. Reproduced with permission from: King, C, Rappaport, LD. Emergent Endotracheal Intubation. In: Textbook of Pediatric Emergency Procedures, 2nd ed, King, C, Henretig, FM (Eds), Lippincott Williams & Wilkins, Philadelphia 2008. Copyright © 2008 Lippincott Williams & Wilkins. file://www.lww.com