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Dispersion index plot of latex particle trapping patterns in the isolated rat lungs subjected to obstructive apnea (circles), and in control lungs not subjected to apnea (squares) (mean ± SD). Apnea alone produced significantly more perfusion maldistribution than controls (P ≤ 0.05) at tissue volumes of 1 × 103–1 × 104 alveoli (asterisk). LogDI values at the 8 smaller tissue volumes were not significantly different between Apnea (n = 6) and Control (n = 6).
