The influence of varying inspired fractions of O2 and CO2 on the development of involuntary breathing movements during maximal apnoea (CROSBI ID 213747)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Brešković, Toni ; Lojpur, Mihajlo ; Zubin Maslov, Petra ; Cross, Troy J. ; Kraljević, Jasenka ; Ljubković, Marko ; Marinović, Jasna ; Ivančev, Vladimir ; Johnson, Bruce D. ; Dujić, Željko.
engleski
The influence of varying inspired fractions of O2 and CO2 on the development of involuntary breathing movements during maximal apnoea
The growing urge to breathe that occurs during breath-holding results in development of involuntary breathing movements (IBMs). The present study determined whether IBMs are initiated at critical levels of hypercapnia and/or hypoxia during maximal apnoea. Arterial blood gasses at the onset of IBM were monitored during maximal voluntary breath-holds. Eleven healthy men performed breath holds after breathing air, hyperoxic–normocapnia, hypoxic– normocapnia, and normoxic–hypercapnia. Prebreathing of the gas mixtures facilitated the IBM onset, reducing the time-to-onset for 46% (hyperoxic condition) and for 80% (hypoxic condition) compared to the normoxic air breathing time. A strong correlation (R = 0.83, P = 0.002) between arterial partial pressure of CO2 (PaCO2 ) at IBM onset after pre-breathing hyperoxic and hypercapnic gas mixtures was observed, suggesting the existence of a possible IBM PaCO2 threshold level of 6.5 ± 0.5 kPa. No clear “threshold” was observed for partial pressure of arterial O2 (PaO2 ). However, we observed that IBM onset was influenced, in part, by an interaction between PaO2 and PaCO2 levels during maximal apnoea. This study demonstrated the complex interaction between arterial blood-gases and the physiological response to maximal breath holding.
apnoea; diaphragm; ventilatory control; respiratory muscles
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Podaci o izdanju
181 (2)
2012.
228-233
objavljeno
1569-9048
10.1016/j.resp.2012.03.007
Povezanost rada
Temeljne medicinske znanosti