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- W2078000900 abstract "The role of respiratory oscillations of PaCO2 (CO2 oscillations) in the regulation of expiratory duration (TE) was examined in eight anesthetized dogs by measuring instantaneous changes of arterial pH during the respiratory cycle with a catheter-tip ISFET (ion-sensitive field effect transistor) pH electrode. Steady-state changes in arterial pH oscillation were induced by vagotomy, which increased the amplitude of pH oscillation from 0.014 +/- 0.002 (mean +/- SEM) to 0.058 +/- 0.006 units (P less than 0.001), and prolonged TE from 5.12 +/- 0.56 to 9.99 +/- 1.11 sec (P less than 0.005) with little change in average pH (0.021 +/- 0.011 units, P = 0.12). Vagotomy also reversed the phase relationship between arterial pH oscillation at the carotid bodies and tidal ventilation, such that pH rose during early expiration, rather than falling as occurred in the intact state. When the within-breath oscillation of arterial pH was transiently reduced by having the vagotomized dogs inspire a single breath of CO2 enriched air, TE of the same breath was shortened in proportion to the reduction in amplitude of pH oscillation (r = 0.72, P less than 0.001), rather than in proportion to changes in the average pH of the test breath (r = 0.44). The results indicate that the profile of within-breath oscillation of PaCO2 (phase relationship and amplitude) can exert an important influence on TE, and may in part account for the prolongation of TE following vagotomy." @default.
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- W2078000900 date "1990-01-01" @default.
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- W2078000900 title "Control of expiratory duration by arterial CO2 oscillations in vagotomized dogs" @default.
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- W2078000900 doi "https://doi.org/10.1016/0034-5687(90)90059-8" @default.
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