References of "Amory, Hélène"
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See detailValidation of the Thermodilution Technique for the Estimation of the Cardiac Output in the Unsedated Calf
Amory, Hélène ULg; Linden, Annick ULg; Desmecht, Daniel ULg et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1991), 38(6), 409-417

The purpose of this study was to establish a standardized protocol in order to obtain accurate and reproducible cardiac output (CO) measurements by the thermodilution technique in the unsedated calf. In 5 ... [more ▼]

The purpose of this study was to establish a standardized protocol in order to obtain accurate and reproducible cardiac output (CO) measurements by the thermodilution technique in the unsedated calf. In 5 healthy calves, the effect of various temperatures, volumes, rates, means and sites of injection of the thermal indicator were tested for their effect on accuracy and reproducibility of CO measurement by the thermodilution technique, the Fick method being used as the standard technique. Five milliliters of an iced 5% dextrose solution per 100 kg body weight constituted the correct amount of thermal indicator. Manual injection of the indicator bolus and/or injection of this bolus through the proximal lumen of a thermodilution Swan-Ganz catheter gave poor results of CO measurements by the thermodilution technique. On the other hand, results of CO measurements were highly reliable when the bolus injection was performed by an ECG-synchronized injection pump and/or through a right atrial catheter with a larger diameter and a shorter length than the classical Swan-Ganz catheter. It was concluded that an iced 5% solution of dextrose (5 ml/100 kg body weight) injected through a right atrial catheter by an ECG-synchronized pump gives the most accurate and reproducible CO measurements by the thermodilution technique in unsedated calves. [less ▲]

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See detailLobeline-Induced Hyperpnea in Equids. Comparison with Rebreathing Bag and Exercise
Art, Tatiana ULg; Desmecht, Daniel ULg; Amory, Hélène ULg et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1991), 38(2), 148-152

In order to facilitate lung auscultation, a transitory hyperpnea may be obtained by lobeline administration, use of a rebreathing bag or exercise. The effect of these three methods on the pulmonary ... [more ▼]

In order to facilitate lung auscultation, a transitory hyperpnea may be obtained by lobeline administration, use of a rebreathing bag or exercise. The effect of these three methods on the pulmonary function were studied and compared in 5 healthy ponies. Respiratory airflow and tidal volume were measured with a pneumotachograph Nr. 5 and pleural pressure with the esophageal balloon catheter technique. Pulmonary function values were measured before, during and after the hyperpnea induced by (i) lobeline, (ii) rebreathing and (iii) exercise. Lobeline administration induced an hyperpnea due to both an increase in tidal volume and respiratory rate; this increase in ventilation lasted for about 90 s and was accompanied by a sharp rise in the respiratory peak airflows, especially the expiratory ones. The rebreathing method induced a less hyperpnea which lasted only 30 s. Lastly the hyperpnea after a light treadmill exercise was the longer in duration and intermediate between the preceding methods in intensity [less ▲]

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See detailCharacterization of the physiological work by measurement of plasma cortisol values in horses competing in 5 different sports disciplines
Linden, Annick ULg; Massart-Leen, M.; Art, Tatiana ULg et al

in Archives Internationales de Physiologie et de Biochimie (1990, February)

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See detailRespiratory-Induced Variability of Pulmonary Arterial Pressure Measurements in Cattle
Amory, Hélène ULg; Art, Tatiana ULg; Desmecht, Daniel ULg et al

in Veterinary Research Communications (1990), 14(3), 227-33

The purpose of this study was to investigate the variability of the peak systolic (PAPs) and the end diastolic (PAPd) pulmonary arterial pressures induced by intrapleural pressure changes in cattle. The ... [more ▼]

The purpose of this study was to investigate the variability of the peak systolic (PAPs) and the end diastolic (PAPd) pulmonary arterial pressures induced by intrapleural pressure changes in cattle. The pleural pressure (Ppl), the electrocardiogram and the pulmonary arterial pressure (PAP) were simultaneously recorded in five healthy calves under three different conditions, i.e. normoxia (N), normoxia with an added airflow resistance (R) and hypoxia (H). PAPs, PAPd and their corresponding transmural pressures were measured and averaged over 10 successive regular cardiac cycles. The maximum Ppl changes (max delta Ppl) were measured on the same tracings. The variance and coefficients of variation were calculated for each set of vascular measurements. Max delta Ppl was significantly increased with regard to N values during R and H conditions. This increase in max delta Ppl induced a simultaneous rise in the variability of PAP measurements, while in each condition, this variability was greatly lowered by use of the corresponding transmural pressure. It was concluded that, in calves with high max delta Ppl, the influence of respiration on PAP becomes considerable. In such cases, the use of transmural pressures rather than luminal pressures can greatly reduce the variability of these pulmonary pressure measurements and therefore increase their sensitivity. [less ▲]

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See detailPhysiological, pathophysiological and pharmacological studies of the mechanics of breathing in cattle
Lekeux, Pierre ULg; Amory, Hélène ULg; Art, Tatiana ULg et al

in Proceedings du Congrès National Vétérinaire Yougoslave (1990)

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See detailLa mecanica respiratoria en terneros sanos respirando Helio-Oxigeno
Rodriguez, MN; Art, Tatiana ULg; Rollin, Frédéric ULg et al

in Proceedings of the XVIth World Buiatrics Congress (1990)

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See detailEtude de l'intervention de la sérotonine en tant que facteur pathogénique potentiel dans les maladies respiratoires des bovins
Desmecht, Daniel ULg; Genicot, B; Linden, Annick ULg et al

in Proceedings of the XVIth World Buiatrics Congress (1990)

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See detailLa mecanica respiratoria en terneros sanos respirando Helio-Oxigeno
Rodriguez, MN; Art, Tatiana ULg; Rollin, Frédéric ULg et al

in Proceedings of the XVIIIth Jordanas Uruguayas de Buiatria (1990)

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See detailEffect of gas density on ventilatory mechanics in healthy calves
Rollin, Frédéric ULg; Rodriguez, MN; Art, Tatiana ULg et al

in Archives Internationales de Physiologie et de Biochimie (1990)

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See detailPulmonary vascular response of healthy calves to intravenous and aerosol 5-hydroxytryptamine
Desmecht, Daniel ULg; Amory, Hélène ULg; Rollin, Frédéric ULg et al

in Archives Internationales de Physiologie et de Biochimie (1990)

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See detailApplication of four lead systems to quantitative electrocardiography in calves
Amory, Hélène ULg; Rollin, Frédéric ULg; Lekeux, Pierre ULg

in Archives Internationales de Physiologie et de Biochimie (1990)

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See detailEtude échocardiographique de la fonction et de la morphologie cardiaque chez le veau hyperviandeux
Amory, Hélène ULg; Genicot, B; Desmecht, Daniel ULg et al

in Proceedings of the XVIth World Buiatrics Congress, (1990)

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See detailComparison of the adrenocortical response to both pharmacological and physiological stresses in sport horses
Linden, Annick ULg; Art, Tatiana ULg; Amory, Hélène ULg et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1990), 37(8), 601-604

Seven sport horses were investigated to compare physiological and pharmacological stresses on the plasma glucocorticosteroid levels. <br />Venous blond was sampled and analysed for cortisol concentrations ... [more ▼]

Seven sport horses were investigated to compare physiological and pharmacological stresses on the plasma glucocorticosteroid levels. <br />Venous blond was sampled and analysed for cortisol concentrations before and after each type of stress. The physiological stress was induced by the completion of a cross-country and the phar¬macological one, by an intravenous ACTH administration (200 µg) in the came horses, one week after the course. <br />Both exercise and ACTH injection induced a highly significant cortisol increase of 79 ± 0.10 %, and 160 ± 0.18 %, respectively. The relative plasma cortisol increases due to exercise on the nue hand, and due to ACTH administration on the other hand, were correlated with a coefficient of 0.82. It was concluded that the plasma cortisol increase induced by a standardised pharmacological stress could be used in order to predict the exercise-induced stress response. [less ▲]

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See detailEffect of Show Jumping on Heart Rate, Blood Lactate and Other Plasma Biochemical Values
Art, Tatiana ULg; Amory, Hélène ULg; Desmecht, Daniel ULg et al

in Equine Veterinary Journal. Supplement (1990), 32(9), 78-82

This study investigated some physiological responses to exercise performed by a horse during show jumping. The effects of jumping on heart rate (HR), blood lactate (LA) and some other blood values were ... [more ▼]

This study investigated some physiological responses to exercise performed by a horse during show jumping. The effects of jumping on heart rate (HR), blood lactate (LA) and some other blood values were studied in nine normal horses participating at the Belgian Junior Championship. Venous blood was sampled before and immediately after the show jumping and was analysed for packed cell volume, LA, blood glucose (GLU), total plasma protein, bicarbonate, sodium, potassium (K+), chloride, calcium and activities of plasma lactate dehydrogenase, creatine phosphokinase (CK) aspartate amino transferase and gamma glutamyl transferase (GGT). A heart rate recorder placed under the saddle allowed the continuous recording of HR from the warm-up until 2 mins after the event. The completion of the jumping induced significant changes in all values, except in K, GLU and GGT. Resting values of LA and HR were 0.53 +/- 0.05 mmol/litre and 43.9 +/- 1.9 beats/min respectively. Post exercise LA reached a mean value of 9.04 +/- 0.9 mmol/litre, and, during the jumping, HR rose to a peak of 191.4 +/- 3.8 beats/min. The results of this study demonstrate that, although the speed and duration of such an exercise are low, show jumping represents a severe exertion which requires the use of anaerobic metabolism. This implies that the training schedule of jumpers must include power training in order to improve their anaerobic capacity. [less ▲]

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See detailSynchronization of Locomotion and Respiration in Trotting Ponies
Art, Tatiana ULg; Desmecht, Daniel ULg; Amory, Hélène ULg et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1990), 37(2), 95-103

The aim of the present experiment was to investigate the hypothesis that there is a respiration-locomotion coupling in trotting equines. Therefore the respiratory airflow (V), the gastric pressure (Pga ... [more ▼]

The aim of the present experiment was to investigate the hypothesis that there is a respiration-locomotion coupling in trotting equines. Therefore the respiratory airflow (V), the gastric pressure (Pga) and pleural pressure (Ppl) changes and the step frequency (SF) were simultaneously recorded in 5 trotting ponies (body weight: 255 +/- 15 kg; age: 3.5 +/- 0.4 years). Airflow was measured using a Fleisch pneumotachograph fixed on a face mask. Esophageal and gastric balloon catheters coupled to pressure transducers allowed the recording of Ppl and Pga. The exercise was performed on a treadmill and consisted of 1 min walking (1.5 m.s-1), 1 min slow trotting (3.0 m.s-1)(Trot 1) and 3 min fast trotting (3.5 m.s-1)(Trot 2). Data were continuously recorded before and during exercise. At walk and Trot 1, none of the ponies displayed a coupling between SF and the respiratory frequency (RF). In one pony, SF and RF were coupled at a constant ratio of 2:1 during Trot 2 while two other ponies displayed the same coupling only up to the second minute of Trot 2. In the two last ponies, a coupling occurred at the third minute of Trot 2. In all ponies, the peaks in Pga occurring during expiration occurred always simultaneously with the first and/or the second peak V, whether or not there was a relationship between SF and RF. On the other hand, when SF and RF were coupled, the first part of inspiration was always simultaneous to a decrease in Pga. It was concluded that in trotting ponies respiration and locomotion are not always independent and that the abdominal piston may act in synergy with the respiratory pump in some phases of the breathing cycle [less ▲]

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See detailA Field Study of Post-Exercise Values of Blood Biochemical Constituents in Jumping Horses: Relationship with Score, Individual and Event
Art, Tatiana ULg; Desmecht, Daniel ULg; Amory, Hélène ULg et al

in Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine (1990), 37(3), 231-239

The variability of the post-exercise values (PEV) of blood lactate and of some other blood constituents were studied in 8 healthy and fit jumpers through 5 national competitions of equal difficulty. The ... [more ▼]

The variability of the post-exercise values (PEV) of blood lactate and of some other blood constituents were studied in 8 healthy and fit jumpers through 5 national competitions of equal difficulty. The effects of factors such as the individual, performance and competition on these PEV were analysed. Venous blood was sampled immediately after the 5 show-jumping contests and was analysed for packed cell volume (PCV), blood lactate, blood glucose (GLU), total plasma protein (TPP), bicarbonate (HCO3-), sodium (Na+), potassium (K+), chloride (Cl-), calcium (Ca2+), serum activities of lactate dehydrogenase (LDH), creatine phosphokinase (CPK), glutamic-oxalacetic transminase (GOT) and gamma glutamyl transferase (gamma GT). PEV of these 13 blood parameters were analysed using a fixed linear model which included the effect of horse, score and competition and their respective interactions. The analysis of the influence of each of the 3 fixed variables showed that (1) there was no relationship between the PEV variations and the score; (2) there were significant (P less than 0.05) variations induced by the competition in Na+, Ca2+, TPP, LDH and GLU, and (3) there were significant interindividual variations as regards Ca2+, TPP, CPK, gamma GT and PCV with P less than 0.05, LDH with P less than 0.01 and blood lactate with P less than 0.001.(ABSTRACT TRUNCATED AT 250 WORDS) [less ▲]

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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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