References of "Linden, Annick"
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See detailCardiovascular Response to Acute Hypoxia in Double-Muscled Calves
Amory, Hélène ULg; Rollin, Frédéric ULg; Desmecht, Daniel ULg et al

in Research in Veterinary Science (1992), 52(3), 316-24

Hypoxic-induced pulmonary hypertension is known to be intensive in the bovine species and sometimes leads to pathological cardiac repercussions. On the other hand, doubled-muscled cattle are predisposed ... [more ▼]

Hypoxic-induced pulmonary hypertension is known to be intensive in the bovine species and sometimes leads to pathological cardiac repercussions. On the other hand, doubled-muscled cattle are predisposed to develop hypoxaemia during exercise and with respiratory diseases. Therefore the purpose of this study was to investigate the cardiovascular response to acute hypoxia in double-muscled calves compared with calves of standard conformation. Pulmonary arterial pressure, electrocardiogram and blood temperature were simultaneously recorded, arterial blood was sampled for blood gas analysis and cardiac output was determined in six Friesian calves and six double-muscled calves of the Belgian White and Blue breed(BWB) when breathing air (fractional inspiratory oxygen concentration [FIO2]: 21 per cent) and when breathing a hypoxic gas mixture (FIO2: 10 per cent). All the absolute values of the measured parameters were significantly (P less than or equal to 0.001) different between the two breeds, except heart rate and arterial blood gas values. The pattern of hypoxic-induced decrease in arterial PO2 was similar in the two breeds of calves, suggesting that the pulmonary exchange capacities during hypoxia are no less efficient in double-muscled calves than in calves of standard conformation. Similarly, the percentage of variation of the mean pulmonary arterial pressure from its normoxic to its hypoxic value was the same in the two breeds of calves, suggesting that double-muscled calves are not predisposed to develop a more precocious or more intense pulmonary hypertension for a given level of hypoxaemia. The significantly smaller normoxic and hypoxic cardiac index and stroke index found in BWB compared with Friesian calves was interpreted as a less efficient cardiac function in double-muscled subjects. [less ▲]

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See detailEffect of intravenous and aerosol administration of 5-hydroxytryptamine on pulmonary function values in healthy calves
Desmecht, Daniel ULg; Linden, Annick ULg; Rollin, Frédéric ULg et al

in American Journal of Veterinary Research (1992), 53(3), 315-320

Effects of IV and aerosol administration of 5-hydroxytryptamine (5-HT) on ventilation, pulmonary mechanics values, pulmonary arterial pressure, and heart rate were investigated in healthy unsedated ... [more ▼]

Effects of IV and aerosol administration of 5-hydroxytryptamine (5-HT) on ventilation, pulmonary mechanics values, pulmonary arterial pressure, and heart rate were investigated in healthy unsedated Friesian calves. Minute volume increased significantly, mainly because of an increase in respiratory rate. Except for total pulmonary resistance after bolus injection, continuous administration of 5-HT given by either route caused significant alterations of lung dynamic compliance and total pulmonary resistance, the former decreasing to one-fifth of its baseline value and the latter increasing twofold. Pulmonary arterial pressure increased significantly, whatever the speed or route of administration. Administration of a bolus did not affect heart rate, whereas continuous IV administration of 5-HT as well by perfusion or by aerosol resulted in sustained tachycardia. It was concluded that 5-HT induces reversible bronchoconstriction and pulmonary vasoconstriction in healthy unsedated calves, 5-HT-induced functional alterations depend on the speed of administration, and excess of 5-HT production or depression in uptake by the lungs during bovine respiratory tract diseases could contribute to pulmonary dysfunction. [less ▲]

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See detailInfluence of training on ventilatory and cardio-respiratory parameters measured during a standardised exercise in thoroughbred horses
Art, Tatiana ULg; Votion, Dominique ULg; Mc Entee, K et al

in Proceedings of the 11th Comparative Respiratory Society Meeting (1992)

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See detailTraining-induced changes in cardio-respiratory parameters during a standardised exercise in thoroughbred horses
Art, Tatiana ULg; Votion, Dominique ULg; Mc Entee, K et al

in Archives Internationales de Physiologie et de Biochimie (1992)

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See detailMeasurement of leg blood flow in calves by the thermodilution method : a technical study
Mc Entee, K; Amory, Hélène ULg; Genicot, B et al

in Archives Internationales de Physiologie et de Biochimie (1992)

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See detailEffets du blocage des recepteurs serotonergiques de type 2 sur les modifications fonctionnelles respiratoires induites par un challenge à la sérotonine chez le bovin
Linden, Annick ULg; Desmecht, Daniel ULg; Amory, Hélène ULg et al

in In Proceedings of the XVIIth World Buiatrics Congress, St Paul, USA, August 1992, 3, 405-410 (1992)

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See detailLa fatigue du diaphragme: un risque vital au cours des pneumonies ?
Desmecht, Daniel ULg; Linden, Annick ULg; Amory, Hélène ULg et al

in Proceedings of the XVIIth World Buiatrics Congress (1992)

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See detailVentilatory effects of rebreathing CO2 in two breeds of calves
Rollin, Frédéric ULg; Desmecht, Daniel ULg; Linden, Annick ULg et al

in Archives Internationales de Physiologie et de Biochimie (1992)

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See detailEffect of experimentally induced acute pneumonia on diaphragmatic strength generation in neonatal calves
Desmecht, Daniel ULg; Linden, Annick ULg; Amory, Hélène ULg et al

in Archives Internationales de Physiologie et de Biochimie (1992)

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See detailEffect of the double-muscled conformation selection on the cardiovascular function in cattle
Amory, Hélène ULg; Desmecht, Daniel ULg; Linden, Annick ULg et al

in Archives Internationales de Physiologie et de Biochimie (1992)

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See detailTechnical and methodological requirements for reliable haemodynamic measurements in the unsedated calf.
Amory, Hélène ULg; Linden, Annick ULg; Desmecht, Daniel ULg et al

in Veterinary Research Communications (1992), 16(5), 391-401

The purpose of this study was (1) to evaluate the technical and methodological problems associated with invasive haemodynamic measurements in unsedated cattle; (2) to assess the reproducibility of such ... [more ▼]

The purpose of this study was (1) to evaluate the technical and methodological problems associated with invasive haemodynamic measurements in unsedated cattle; (2) to assess the reproducibility of such measurements both within and between days; and (3) to compare the values with those previously reported. Twenty-one healthy calves, aged from 5.5 to 12 months, were studied. The central venous, the right ventricular, the pulmonary arterial, the pulmonary capillary wedge and the systemic arterial pressures were obtained by means of fluid-filled catheters, and the cardiac output was measured by the thermodilution technique. The heart rate, the stroke volume, the pulmonary and systemic vascular resistances and the pulmonary and systemic ventricular workloads were calculated. An adverse reaction, consisting of severe pulmonary hypertension, tachycardia, tachypnoea and transient weakness, occurred in 7 calves during the catheterization procedures. Such a reaction might be due to a local reflex induced by stimulation of mechano-receptors by the catheter tip. It should be avoided by reducing the manipulation of the catheter as much as possible and by inflating the tip of the balloon when moving it forwards. A comparison of the vascular pressures with those previously reported was difficult because of methodological or technical limitations, such as, for instance, a lack of standardization of the baseline. The reproducibility of the haemodynamic measurements obtained was satisfactory, in contrast to previous studies performed in conscious animals. This was attributed to our animals being better trained to the experimental conditions and emphasizes the importance of reducing mental stress in obtaining reliable haemodynamic measurements in unsedated and potentially uncooperative animals. [less ▲]

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See detailQuantitative Buffy Coat Analysis Related to Adrenocortical Function in Horses During a Three-Day Event Competition
Linden, Annick ULg; Art, Tatiana ULg; Amory, Hélène ULg et al

in Zentralblatt für Veterinarmedizin. Reihe A (1991), 38(5), 376-82

This study was carried out to investigate stress induced in a cross-country by measuring plasma cortisol and to compare the changes in cortisol level with the leucocytic changes measured with the ... [more ▼]

This study was carried out to investigate stress induced in a cross-country by measuring plasma cortisol and to compare the changes in cortisol level with the leucocytic changes measured with the quantitative buffy coat (QBC) analysis, which is a new method applicable in field conditions for the evaluation of haematological parameters in horses. Seven healthy horses competing in a national three-day event were investigated. Venous blood was sampled under resting condition, 2 min and 180 min after the completion of the cross-country and analysed for haematological parameters, plasma cortisol, protein and lactate levels. Immediately after the event, there was a significant increase in all values except in the granulocytes (Gr) to lymphocytes-monocytes (LM) ratio. 180 min after the event, all the parameters returned to their resting levels while white blood cells (WBC), Gr and Gr/LM ratio were significantly higher with respect to their resting values. A high correlation (r = 0.82) was found between the relative increase in plasma cortisol levels 2 min after exercise and the relative increase in Gr/LM 180 min after exercise. Therefore it was concluded that the Gr/LM ratio measured 180 min after exercise with the QBC analysis is a reliable index to estimate the plasma cortisol levels measured 2 min after exercise. This new technique could consequently be used in order to evaluate, in field conditions, the exercise-induced stress. [less ▲]

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See detailThérapeutique des pathologies respiratoires aiguës des bovins
Lekeux, Pierre ULg; Gustin, Pascal ULg; Desmecht, Daniel ULg et al

in Annales de Médecine Vétérinaire (1991), 135

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See detailEffect of 5 different types of exercise, transportation and ACTH administration on plasma cortisol concentration in sports horses.
Linden, Annick ULg; Art, Tatiana ULg; Amory, Hélène ULg et al

in Persson, S. G. B.; Jeffcott, L. B.; Lindholm, A. (Eds.) Equine Exercise Physiology III (1991)

This study was carried out to compare the changes in plasma cortisol concentration produced by 5 different types of exercise, transportation and ACTH administration. Venous blood was analysed for cortisol ... [more ▼]

This study was carried out to compare the changes in plasma cortisol concentration produced by 5 different types of exercise, transportation and ACTH administration. Venous blood was analysed for cortisol concentration before and after each stimulus. The types of exercise were show jumping (n=28), cross country phase of a three-day event (n=32), trot race (n=9), gallop race (n = 10) and endurance ride (n=8). The response following the intravenous injection of synthetic ACTH (200 µg) in 6 of the event horses was determined. The ACTH test was carried out one week after competition. In 5 horses, the response to road transport of one hour was studied. All stimuli, except transportation produced a significant increase in plasma cortisol concentration. The endurance ride produced the largest increase and the show jumping the smallest. ACTH administration resulted in a 164% rire in plasma cortisol. Il was concluded that I) the degree of increase in plasma cortisol concentration appeared to reflect both intensity and dotation of workload; endurance ride appeared to be the most exhaustive and show jumping the least; 2) there was a correlation (r2=0.82) between the individual cortisol response to cross country exercise and to exogenous ACTH in the saure horses and 3) there was an important individual effect on transport-induced cortisol changes. [less ▲]

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See detailInhibition of serotonin-induced pulmonary alterations in calves by a selective S2 serotonergic antagonist
Linden, Annick ULg; Desmecht, Daniel ULg; Amory, Hélène ULg et al

in Archives Internationales de Physiologie et de Biochimie (1991)

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See detailAssessment of the ventilatory response to CO2 in two breeds of calves
Rollin, Frédéric ULg; Desmecht, Daniel ULg; Linden, Annick ULg et al

in Proceedings of the 10th Comparative Respiratory Society Meeting (1991)

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See detailComparison of 5-hydroxytryptamine concentration in the lungs of healthy and pneumonic calves
Linden, Annick ULg; Desmecht, Daniel ULg; Amory, Hélène ULg et al

in Proceedings of the 10th Comparative Respiratory Society Meeting (1991)

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See detailImpaired diaphragmatic function in the pneumonic calf
Desmecht, Daniel ULg; Linden, Annick ULg; Amory, Hélène ULg et al

in Proceedings of the 10th Comparative Respiratory Society Meeting (1991)

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