Fig. 3From: Current methodological and technical limitations of time and volumetric capnography in newbornsDead space calculation by Fletcher’s method using Fowler’s equal areas (p = q) to define dead space. The area X corresponds to the exhaled amount of CO2 and the areas Z and Y to the nonexhaled CO2 as a consequence of the anatomic + apparatus (X) and alveolar (Y) dead spacesBack to article page