Breathe Easy Pediatrics Presents: Tidal Volume Episode 6 – RC Time Constants
ATS Breathe Easy
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How Do Time Constants of the Respiratory System Change With Age?
In a spontaneously breathing infant, the normal phenomenon of expiratory breaking increases the end expiratory lung volume. In healthy infants, tau increases from about 3-10ths of a second to about 6-10th seconds during the first year of life. After childhood and into adulthood, time constants stay about the same unless the child or adult develops a disease that increases the resistance and compliance of his or her respiratory system.
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