A Model Analysis of Arterial Oxygen Desaturation during Apnea in Preterm Infants
Figure 10
Conceptual framework depicting the temporal sequence of influence of the key cardiorespiratory factors on .
Note the regions of influence of lung volume (), cardiac output (
) and blood volume (
), each with respect to metabolic O2 consumption (
). Hemoglobin content (Hb) influences the latter phase of stage 1 as well as stage 2. The impact of reduced
is limited to stage 1, and blood volume to stage 2. Reduced
causes a leftward shift in the desaturation trajectory. Note that the point of inflection at the transition between stages reveals the resting
.