Arterial blood gas after 15 minutes MJV (mean ± SD): pH was 7.33 ± 0.99, PaO2 was 308.8 ± 130.0, PaCO2 was 45.6 ± 10.2, HCO3 was 28.7 ± 7.8. Respectively after 30 minutes MJV: 7.28 ± 0.06, 295.6 ± 124.0, 52.15 ± 11.1, 30.6 ± 6.4, 15 minutes after finishing MJV: 7.42 ± 0.06; 273.9 ± 78.0, 37.8 ± 5.6, 28.5 ± 5.8.