Arterial PCO2 (Figure 3) increased in both the airwayblocked
and compression-alone groups, reaching significance
by 10 minutes. In contrast, ventilation with room
air or with 100% oxygen prevented the increase in arterial
PCO2; the PCO2 actually decreased significantly in the
group receiving 100% oxygen by the first minute of
resuscitation.
Mixed venous PCO2 showed a similar pattern (Figure 4).
Venous PCO2 progressively increased in the airway-blocked
and compression-only groups, reaching significance by
the third minute of resuscitation. In contrast, venous PCO2
remained near control values until the final sample of the
resuscitation period in the other two groups.
Statistical comparisons of PO2 between groups are shown
for each sample time in Table 1. Compared with chest
compression alone, ventilation with room air significantly
increased arterial PO2 throughout the 20-minute resuscitation
period. Ventilation with 100% oxygen further increased
arterial PO2 above the level achieved with either chest compression
alone or room air ventilation. Mixed venous PO2
showed a similar pattern, but significance was reached only
after the third minute of resuscitation.
Arterial PCO2 (Figure 3) increased in both the airwayblockedand compression-alone groups, reaching significanceby 10 minutes. In contrast, ventilation with roomair or with 100% oxygen prevented the increase in arterialPCO2; the PCO2 actually decreased significantly in thegroup receiving 100% oxygen by the first minute ofresuscitation.Mixed venous PCO2 showed a similar pattern (Figure 4).Venous PCO2 progressively increased in the airway-blockedand compression-only groups, reaching significance bythe third minute of resuscitation. In contrast, venous PCO2remained near control values until the final sample of theresuscitation period in the other two groups.Statistical comparisons of PO2 between groups are shownfor each sample time in Table 1. Compared with chestcompression alone, ventilation with room air significantlyincreased arterial PO2 throughout the 20-minute resuscitationperiod. Ventilation with 100% oxygen further increasedarterial PO2 above the level achieved with either chest compressionalone or room air ventilation. Mixed venous PO2showed a similar pattern, but significance was reached onlyafter the third minute of resuscitation.
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