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Evaluation of a mainstream capnometer and end‐tidal carbon dioxide monitoring in mechanically ventilated infants
Author(s) -
Meredith Keith S.,
Monaco Frank 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.1950090412
Subject(s) - medicine , mechanical ventilation , endotracheal tube , anesthesia , airway , capnography , intubation
We evaluated a new lightweight capnometer with a < 1 mL deadspace neonatal airway adapter and endotracheal tube connector unit (NAC) for use in mechanically ventilated neonates. The evaluation consisted of: 1) a bench test comparison of air flow resistance between the standard endotracheal tube and connector with the new NAC (flow rates, 1.5 to 12.8 L/min); 2) a determination of the effect of NAC placement on Pa CO 2; 3) pre‐ and post‐NAC pulmonary mechanics; and 4) an analysis of paired Pet CO 2and Pa CO 2in 16 infants requiring mechanical ventilation. Paired t test of the slopes of the resistance curves was significant ( P = 0.002) while analysis of variance of differential pressures was not ( P = 0.29). All post‐NAC placement Pa CO 2were smaller than pre‐placement values; there were no differences in pulmonary mechanics, and Pet CO 2correlated closely with Pa CO 2(n = 132, r = 0.79) defined as Pet CO 2= 0.68 • Pa CO 2+ 5.21; x̄ ± 1 SD, Pa CO 2–Pet CO 2was 4.7 ± 4.7 torr and Pet CO 2/Pa CO 2was 0.86 ± 0.14. Pediatr Pulmonal 1990; 9:254–259 .