TECHNICAL AND METHODOLOGICAL REQUIREMENTS FOR RELIABLE HAEMODYNAMIC MEASUREMENTS IN THE UNSEDATED CALF

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