Gas Exchange in Severe Chronic Obstructive Lung Disease in Relation to Inspired Oxygen and Increased Carbon Dioxide Fraction, Physical Exercise and Body Posture

Tammivaara-Hilty, Ritva

doi:10.3109/03009737309178615

Upsala Journal of Medical Sciences

1973

DOI: 10.3109/03009737309178615

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Gas Exchange in Severe Chronic Obstructive Lung Disease in Relation to Inspired Oxygen and Increased Carbon Dioxide Fraction, Physical Exercise and Body Posture

Ritva Tammivaara-Hilty

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1973

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Central Haemodynamics during Hypoxia, Hyperoxia and Hypercapnoea in Severe Chronic Obstructive Lung Disease

Tammivaara-Hilty

1973

Upsala Journal of Medical Sciences

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During inhalation of four different gas mixtures, with FIo,-0.15 and -0.11 and N 0.99 and with FICO2-0.055, the central haemodynamics of 25 patients with severe chronic obstructive Lung disease and with a ventilatory capacity of Q 35 7; of predicted normal values were studied. Fourteen patients (8 male, 6 female) had previously had periods of manifest respiratory insufficiency (R-group) and 11 patients (10 male, one female) had had no such severe respiratory symptoms (comparison group C).The lowest tolerated FIoz level and the tolerated duration of the inhalation periods of different gas mixtures varied in relation to the severity of the disease. Hypoxid caused an increase in pulmonary arterial pressure and probably in vascular resistance. At the lowest attained hypoxaemic level the pulmonary arterial (PA) mean pressure was about 37 mmHg, although with large individual differences, in both groups. This PA pressure level was reached at significantly higher FIo,, arterial saturation and oxygen tension levels in the Rgroup patients. During hyperoxia there was no significant difference between PA mean pressure in R-(25 mmHg) and C-(22 mmHg) group patients. The pressure reactions during hypoxia suggest that the vascular responsiveness might have been greater in R-group patients.During induced hypercapnoea the increase in PA mean pressure (R-group 36 and C-group 33 mmHg) was mostly due to an elevation of PCV pressure, which occurred in relation to an increase in arterial blood pressure. The pulmonary vascular resistance probably did not increase during induced hypercapnoea. In a few patients latent failure of the left ventricle became manifest when the arterial blood pressure was raised due to the increased inspiratory CO,.

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Central Haemodynamics during Hypoxia, Hyperoxia and Hypercapnoea in Severe Chronic Obstructive Lung Disease

Tammivaara-Hilty

1973

Upsala Journal of Medical Sciences

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Gas Exchange in Severe Chronic Obstructive Lung Disease in Relation to Inspired Oxygen and Increased Carbon Dioxide Fraction, Physical Exercise and Body Posture

Cited by 1 publication

References 19 publications

Central Haemodynamics during Hypoxia, Hyperoxia and Hypercapnoea in Severe Chronic Obstructive Lung Disease

Central Haemodynamics during Hypoxia, Hyperoxia and Hypercapnoea in Severe Chronic Obstructive Lung Disease

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