RT Book, Section A1 Parikh, Rushi R. A1 Huang, Craig J. A2 Tintinalli, Judith E. A2 Ma, O. John A2 Yealy, Donald M. A2 Meckler, Garth D. A2 Stapczynski, J. Stephan A2 Cline, David M. A2 Thomas, Stephen H. SR Print(0) ID 1166593974 T1 Stridor and Drooling in Infants and Children T2 Tintinalli's Emergency Medicine: A Comprehensive Study Guide, 9e YR 2020 FD 2020 PB McGraw-Hill Education PP New York, NY SN 9781260019933 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1166593974 RD 2024/11/13 AB Stridor is characterized as a high-pitched, harsh, monophonic sound produced by turbulent airflow through a partially obstructed airway.1 Both inspiratory and expiratory stridor are associated with airway obstruction. As air is forced through a narrow tube, it undergoes an increase in speed and a decrease in pressure (Bernoulli’s principle). The decrease in lateral pressure causes the walls of the airway to temporarily collapse and vibrate, generating this stridulous sound. Hagen-Poiseuille’s law shows that resistance to laminar airflow increases markedly with small decreases in the airway’s radius.2 A small amount of inflammation can result in significant airway obstruction in children.