Using modified Fenn diagrams to assess ventilatory acclimatization during ascent to high altitude: Effect of acetazolamide.

Although both groups followed a decreasing trend in mean P ETC O 2 and S p O 2 values, participants using acetazolamide reached lower P ETC O 2 more quickly (due to increases in ventilation), allowing them to maintain relatively higher S p O 2 values, resulting in a more rightward and downward trend on the modified Fenn diagram (see Figure 7f ). 3.2.3.

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