References of "Amory, Hélène"
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See detailAn experimental trial of intramuscular metrenperone to induce respiratory improvement during pneumonia in neonatal calves
Linden, Annick ULg; Desmecht, Daniel ULg; Amory, Hélène ULg et al

in Archives Internationales de Physiologie et de Biochimie (1993)

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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 detailApplication of vectocardiography in cattle
Amory, Hélène ULg; Genicot, B; Rollin, Frédéric ULg et al

in Proceedings of the XVIth World Buiatrics Congress (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 detailBovine Vectocardiography: A Comparative Study Relative to the Validity of Four Tridimensional Lead Systems
Amory, Hélène ULg; Rollin, Frédéric ULg; Genicot, B. et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1992), 39(6), 453-469

For spatial vectocardiography to become applicable for cardiac investigation in cattle, it was necessary to develop a reliable standardized electrocardiographic lead system in this species. In this study ... [more ▼]

For spatial vectocardiography to become applicable for cardiac investigation in cattle, it was necessary to develop a reliable standardized electrocardiographic lead system in this species. In this study, four tridimensional lead systems, initially developed in horses, were compared when applied in calves. Fifty seven electrocardiograms were collected. The between-subject variability of the magnitude and angles of the tridimensional P, QRS and T modal vectors obtained by use of each lead system was compared. Reproducibility of vectrocardiographic measurements was analyzed by comparing results obtained in 10 calves within a one day interval. The Holmes semi-orthogonal lead system, giving the lowest between-subject variability and the highest between-day reproducibility, appeared to be the most reliable lead system in order to apply vectocardiography in the bovine species. [less ▲]

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See detailEchocardiographic Evaluation of Cardiac Morphologic and Functional Variables in Double-Muscled Calves
Amory, Hélène ULg; Kafidi, Nacereddine ULg; Lekeux, Pierre ULg

in American Journal of Veterinary Research (1992), 53(9), 1540-1547

We studied, by means of echocardiography in vivo, the cardiac consequences of the double-muscled character selection in beef cattle. Morphologic and functional echocardiographic variables were regularly ... [more ▼]

We studied, by means of echocardiography in vivo, the cardiac consequences of the double-muscled character selection in beef cattle. Morphologic and functional echocardiographic variables were regularly estimated in 17 Friesian and 8 Belgian White and Blue calves during their growth. A total of 50 and 44 sets of data were collected in each group, respectively. Recordings were obtained, using 2-dimensional and M-mode echocardiography, and included measurements in long- and short-axis views of the heart. Most of the diastolic measurements of the left ventricle were not significantly different between breeds when normalized for body weight. To the contrary, systolic measurements of left ventricular wall thickness and dimensions were significantly (P less than or equal to 0.001) lower and greater, respectively, in Belgian White and Blue calves than in Friesian calves. This was interpreted as a result of significantly (P less than or equal to 0.001) lower left ventricular systolic functional indices in Belgian White and Blue than in Friesian calves. Echocardiographic evidence that the double-muscled selection in cattle induces alteration in morphologic variables of left ventricle was not found. However, results indicate that indices of left ventricular systolic function are lower in double-muscled calves than in calves with standard conformation. [less ▲]

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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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