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Infants with upper respiratory illnesses have significant reductions in maximal expiratory flow
Author(s) -
Martinez Fernando D.,
Taussig Lynn M.,
Morgan Wayne J.
Publication year - 1990
Publication title -
pediatric pulmonology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.866
H-Index - 106
eISSN - 1099-0496
pISSN - 8755-6863
DOI - 10.1002/ppul.1950090206
Subject(s) - medicine , functional residual capacity , airway , pediatrics , airway obstruction , respiratory system , ventilation (architecture) , anesthesia , cardiology , lung volumes , lung , mechanical engineering , engineering
We studied maximal expiratory flows at functional residual capacity (V̇ max FRC) obtained by use of the chest compression technique in 9 infants who had signs of upper respiratory illness (URI) at the time of testing, and in 9 infants who were symptom‐free but whose parents reported they had a URI in the previous month. When compared to 109 infants with no URI, infants with current URI had 40% lower V̇ max FRC (mean±SD: 125.7 ± 54.5 mL/s vs. 73.6 ± 53.6 mL/s; P < 0.01). Infants with a past URI had mean values for V̇ max FRC (120.2 ± 50.2 mL/s) that were not significantly different from those of infants with no URI. Changes in the shape of the flow‐volume loop analogous to those reported in infants with lower airway obstruction were also noticed in infants with current URI. These findings suggest that, as in older children and adults, clinically unapparent alterations in lower airway function occur during URI in infants. Pediatr Pulmonal 1990; 9:91–95 .