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See detailVentilatory Mechanics in Healthy Calves During Helium-Oxygen Breathing
Rodriguez, M. N.; Art, Tatiana ULg; Rollin, Frédéric ULg et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1990), 37(4), 241-246

The mechanics of breathing was investigated in six healthy calves breathing either air or a mixture of 79% helium and 21% oxygen (He-O2). Intrapleural pressure (Ppl) was measured with an esophageal ... [more ▼]

The mechanics of breathing was investigated in six healthy calves breathing either air or a mixture of 79% helium and 21% oxygen (He-O2). Intrapleural pressure (Ppl) was measured with an esophageal balloon catheter and transpulmonary pressure was obtained by subtracting the mouth pressure (Pm) from Ppl. Respiratory airflow (V) was measured using a Fleisch pneumotachograph N degrees 3 and tidal volume (Vt) was electronically derived by integrating V with respect to time. Respiratory airflow, Vt, Ppl and Pm were simultaneously recorded while the calves breathed first air (1 min), secondly He-O2 (1 min) and finally air again (1 min). The pulmonary function values were calculated on the tracings and the He-O2 values were compared to the corresponding "air" values. The ventilatory response to resistance unloading was characterized by a significant increase in minute volume exclusively due to an increase in respiratory frequency, while Vt remained unchanged. A decrease of 32% in the total pulmonary resistance (RL) and 16% in the work per litre of ventilation (Wrm/l) were observed when calves breathed He-O2. The effect of the He-O2 on RL and on Wrm/l suggests that, in the bovine species, airflow turbulances in the upper part of the respiratory tract play a significant role in the total airways resistance. [less ▲]

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See detailEvidence of cardiovascular dysfunction during Pasteurella haemolytica - induced acute pneumonia in calves
Amory, Hélène ULg; Linden, Annick ULg; Desmecht, Daniel ULg et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1990)

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See detailPulmonary response to intravenous 5-hydroxytryptamine in the healthy calf
Desmecht, Daniel ULg; Rollin, Frédéric ULg; Amory, Hélène ULg et al

in Proceedings of the 8th Comparative Respiratory Society Meeting (1989)

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See detailAerosol serotoninergic responses in respiratory mechanics of healthy calves
Desmecht, Daniel ULg; Rollin, Frédéric ULg; Amory, Hélène ULg et al

in Proceedings of the 8th Comparative Respiratory Society Meeting (1989)

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See detailMechanics of breathing and ventilatory drive in double-muscled calves during acute hypoxia
Rollin, Frédéric ULg; Amory, Hélène ULg; Desmecht, Daniel ULg et al

in Proceedings of the 8th Comparative Respiratory Society Meeting (1989)

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See detailDirect measurement of static chest wall compliance in unsedated calves
Desmecht, Daniel ULg; Rollin, Frédéric ULg; Amory, Hélène ULg et al

in Proceedings of the 8th Comparative Respiratory Society Meeting (1989)

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See detailEffect of acute hypoxia on the bovine ventilatory mechanics
Rollin, Frédéric ULg; Amory, Hélène ULg; Desmecht, Daniel ULg et al

in Archives Internationales de Physiologie et de Biochimie (1989)

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See detailMeasurement of pulmonary inertance in Equids
Art, Tatiana ULg; Lekeux, Pierre ULg; Gustin, Pascal ULg et al

in European Respiratory Journal (1989), 2

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See detailMaximal diaphragmatic strength measurement in healthy unsedated calves
Desmecht, Daniel ULg; Rollin, Frédéric ULg; Amory, Hélène ULg et al

in Archives Internationales de Physiologie et de Biochimie (1989)

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See detailThe effect of airway occlusion and lobeline-induced hyperventilation on diaphragmatic strength in ponies
Desmecht, Daniel ULg; Art, Tatiana ULg; Rollin, Frédéric ULg et al

in Archives Internationales de Physiologie et de Biochimie (1989)

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See detailInertial pressures in exercising ponies
Art, Tatiana ULg; Lekeux, Pierre ULg; Gustin, Pascal ULg et al

in Archives Internationales de Physiologie et de Biochimie (1989)

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See detailEffects of intrapleural pressure changes on pulmonary haemodynamics measurements in unsedated cattle
Amory, Hélène ULg; Rollin, Frédéric ULg; Art, Tatiana ULg et al

in Archives Internationales de Physiologie et de Biochimie (1989)

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See detailEffect of acute hypoxia on the pulmonary haemodynamics in two different breeds of cattle
Amory, Hélène ULg; Rollin, Frédéric ULg; Art, Tatiana ULg et al

in Archives Internationales de Physiologie et de Biochimie (1989)

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See detailInertance of the Respiratory System in Ponies
Art, Tatiana ULg; Lekeux, Pierre ULg; Gustin, Pascal ULg et al

in Journal of Applied Physiology (Bethesda, Md. : 1985) (1989), 67(2), 534-540

The purpose of the present work was to measure the pulmonary inertance (IL) in ponies and to analyze its potential influence on the mechanics of breathing and on their aptitude to increase ventilation ... [more ▼]

The purpose of the present work was to measure the pulmonary inertance (IL) in ponies and to analyze its potential influence on the mechanics of breathing and on their aptitude to increase ventilation during exercise. Five healthy ponies 2.4-4 yr old [mean wt 255 +/- 15 (SE) kg] were used. On the one hand, inertance of the respiratory system (Irs) was computed from the value of the resonant frequency (fr) measured by the forced oscillation technique. On the other hand, respiratory airflow, tidal volume (VT), and transpulmonary pressure (PL) changes were recorded while the ponies were performing a light treadmill exercise, and IL was calculated as the ratio of the associated differences in inertial pressure (delta Pin) to volume acceleration (delta V). Respiratory airflow and VT were measured with a Fleisch pneumotachograph (no. 5) and PL with an intraesophageal balloon catheter. First, the protocol was carried out with the ponies breathing air and He-O2, second, while the ponies breathed through two additional tubes (100 cm long, 3 cm ID), then one, and finally none, fixed on the Fleisch pneumotachograph. Finally, the contribution of the extra- vs. the intrathoracic airways to IL was estimated by measuring the lateral midtracheal pressure recorded simultaneously with the aforementioned parameters. The values of Irs calculated with fr and of IL calculated on the basis of the delta Pin-delta V ratio were 29.8 +/- 0.4 and 19.8 +/- 1.0.10(-4) kPa.l-1.s-2, respectively. During He-O2 breathing IL decreased about three times; this result was similar to the predicted decrease based on gas density only.(ABSTRACT TRUNCATED AT 250 WORDS) [less ▲]

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See detailCould pulmonary inertance be a limiting factor of ventilation during exercise in the equine species ?
Art, Tatiana ULg; Lekeux, Pierre ULg; Gustin, Pascal ULg et al

in Proceedings of the 7th Comparative Respiratory Society Meeting (1988)

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See detailAssessment of respiratory muscle performance in non cooperative subjects : a preliminary study
Desmecht, Daniel ULg; Art, Tatiana ULg; Amory, Hélène ULg et al

in Proceedings of the 7th Comparative Respiratory Society Meeting (1988)

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See detailInfluence of the intrapleural pressure on the variability of the pulmonary arterial pressures measurements in calves
Amory, Hélène ULg; Art, Tatiana ULg; Gustin, Pascal ULg et al

in Proceedings of 7th comparative Respiratory Society Meeting, Chicago (USA) (1988)

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