![]() ![]() ![]() About a third of every resting breath is exhaled exactly as it came into the body.īecause of dead space, taking deep breaths more slowly (e.g. V D-Alv was higher in infants that have undergone prolonged mechanical ventilation.Īnatomical dead space capnography newborn infants physiological dead space premature.Not all the air we breathe in is able to be used for the exchange of oxygen and carbon dioxide. ![]() V D-Ana /kg and V D-Alv /kg increased with decreasing weight and gestation. The median V D-Alv /kg was not higher in prematurely born infants compared to term infants after adjusting for differences in respiratory rate and days of ventilation (P = 0.482). The median V D-Ana /kg was higher in prematurely born infants compared to term infants. V D-Ana and V D-Alv were related to body weight at the time of study. V D-Alv was determined by subtracting V D-Ana from the physiological dead space which was determined by the Bohr-Enghoff equation. V D-Ana was determined using Fowler's method of volumetric capnography. Retrospective analysis of data collected at King's College Hospital NHS Foundation Trust, London, UK.įifty-six infants (11 term, 45 preterm) were studied at a median age of 8 (IQR 2-33) days. V D-Ana and V D-Alv will be higher in prematurely born compared to term born infants. ![]() To compare the anatomical (V D-Ana ) and alveolar dead space (V D-Alv ) in term and prematurely born infants and identify the clinical determinants of those indices. ![]()
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