Jørgen Westby

  • Citations Per Year
Learn More
The impact of adenosine receptor blockade on left ventricular systolic function and diastolic creep in stunned myocardium was studied in 20 sodium pentobarbital anaesthetized cats. A control group (n = 10) was compared with a group (n = 10) where adenosine receptors were blocked by 8-phenyltheophylline (7.5 mg.kg-1 i.v.) prior to a 10 min occlusion of the(More)
The domestic pig is a useful model in certain areas of biomedical research. Effective use of this species is often encumbered by lack of reference values in conscious as well as anaesthetized animals. Anaesthesia itself influences physiological and biological variables; the anaesthetic technique often affects experimental results. The relationship between(More)
BACKGROUND Elevation of cardiac biochemical markers and ST segment depression in the electrocardiogram have important roles in the risk stratification of unstable coronary syndromes. We assessed graded duration of acute coronary ischaemia with ST depression versus release of cardiac troponin I (cTnI) and conventional cardiac markers in 15 ischaemic pigs and(More)
OBJECTIVE This study focused on transmural postischaemic recovery of ATP and regional contractile function related to reversible and irreversible tissue injury. METHODS Fifty anaesthetised open-chest cats were randomised into two groups. Groups I: 10 min of LAD occlusion (n = 10) and 10 min of LAD occlusion followed by 180 min of reperfusion (n = 15).(More)
OBJECTIVE The aim was to analyse the influence of coronary postjunctional alpha 1 and alpha 2 adrenergic vasoconstriction in hypoperfused myocardium with special emphasis on transmural distribution of blood flow. METHODS The left coronary artery was hypoperfused by means of a clamped shunt line. Sequential selective postjunctional alpha 1 (doxazosin) and(More)
The objective of the present study was to assess the uniformity of contraction in reperfused myocardium. Regional function was measured by two pairs of piezo-electric crystals oriented in the circumferential and longitudinal axis of the left ventricular anterior midwall in 10 open-chest pentobarbitone-anaesthetized cats. The left anterior descending(More)
A simple two-compartment model was used to study the effects of water exchange on the signal produced by an inversion recovery prepared rapid gradient-echo sequence during the first passage of a low dose of an intravascular contrast agent. Water exchange at intermediate rates of exchange (1-10 Hz) between the vascular and extravascular spaces caused the(More)
OBJECTIVE The aims were to determine (1) whether acute coronary occlusion provoked uniform hyperkinesis in remote non-ischaemic myocardium, and (2) how subsequent coronary stenosis affected such hyperkinesis. METHODS Two pairs of ultrasonic crystals were placed in the anterior left ventricular midwall of nine pentobarbitone anaesthetised open chest cats.(More)
The effects of circumflex coronary artery occlusion on regional myocardial performance and blood flow in the left ventricular anterior wall was studied, using 16 thoracotomized pentobarbital-anaesthetized cats. Two pairs of ultrasonic crystals were placed in the midwall; one segment (longitudinal) parallel to the subendocardial fibres, the other(More)
In anaesthetized open-chest casts with occlusion of the left anterior descending coronary artery (LAD), adenine nucleotides and degradation products were studied in small myocardial tissue samples (10-20 mg) with high-pressure liquid chromatography, and tissue blood flow was measured with radioactive microspheres 5, 10, 20, 40, and 60 min after LAD(More)