Journal of Applied Physiology
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J Appl Physiol 68: 1127-1133, 1990;
8750-7587/90 $5.00
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Journal of Applied Physiology, Vol 68, Issue 3 1127-1133, Copyright © 1990 by American Physiological Society

ARTICLES

Influence of tidal volume on respiratory compliance in anesthetized infants and young children

M. E. Fletcher, M. Ewert, C. Stack, D. J. Hatch and J. Stocks
Respiratory and Anaesthetic Unit, Institute of Child Health, London, United Kingdom.

Recent studies have suggested a close association between total respiratory compliance (Crs) and tidal volume in anesthetized paralyzed infants who are being artificially ventilated. To investigate this further, the multiple occlusion technique was used to measure Crs in 20 anesthetized infants and young children (aged 1-25 mo) before elective surgery. Measurements were made after intubation 1) during spontaneous breathing (SB), 2) after administration of a non-depolarizing muscle relaxant with tidal volume and frequency mimicking that during SB, and 3) with the child still paralyzed but tidal volume approximately double that during SB. Compared with values obtained during SB, there was no significant change in Crs after paralysis when ventilation matched the child's own pattern (P greater than 0.2). When ventilated with the larger tidal volumes, the infants showed a highly significant increase in Crs (mean 62%, range 14-158%, P less than 0.0001). These results may have implications not only for studies performed during anesthesia but also when infants were monitored in the intensive care setting. Values of Crs obtained in ventilated infants may reflect both the mechanical behavior of the respiratory system and the pattern of ventilation at the time of measurement.


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