background: angiotensin converting enzyme (ace) upregulation in stromal cells of joints affected by rheumatoid arthritis may lead to higher tissue angiotensin ii that is a vasoconstrictor and mitogen factor. to date, the role of angiotensin ii on regulating blood flow in inflamed joints has not been studied.   methods: acute and chronic joint inflammation was induced in rabbits by intra-articul...

Background & Aims: The anti TNF drugs are new line treatment for articular inflammatory diseases which are used systemically, but due to expensiveness and some systemic adverse effects have limited usage. The aims of this study were to investigate the effect of intra-articular (local) injection of Etanercept and Infliximab as two anti TNF drugs on histopathology and also due to the important ro...

Background. Aging is associated with changes of the systolic blood pressure that may increase cardiac work and myocardial blood flow at rest and reduce the myocardial flow reserve. This might be misinterpreted as age-related impairment of the coronary vasodilator capacity. Methods and Results. Myocardial blood flow was quantified at rest and after administration of intravenous dipyridamole in 4...

We conducted regional cortical blood flow studies using the xenon-133 clearance technique on 12 volunteers during the administration of 25% and 50% N2O and during baseline conditions (breathing room air or 100% O2). Global cortical blood flow was very highly significantly increased above baseline measures in all subjects by 50% N2O (mean increase 37% above 100% O2 condition). A smaller but stil...

We examined the ability of individual regions of the canine left ventricle to increase blood flow relative to baseline rates of perfusion. Regional coronary flow was measured by injecting radioactive microspheres over 90 seconds in seven anesthetized mongrel dogs. Preliminary experiments demonstrated a correlation between the regional distributions of blood flow during asphyxia and pharmacologi...

Background. This study investigated the effects of impairment to placental flow on flow patterns through the aortic isthmus because in the fetus, this vascular segment is the link between the parallel vascular systems perfused by the left and right ventricles. Methods and Results. A progressive increase in resistance to blood flow through the placenta was created in seven exteriorized fetal lam...

Coronary sinus flow (CSF) was measured in seven patients with normal coronary arteries (group A) during intracoronary injections of 6 ml arterial blood, 6 ml blood from the coronary sinus, 3 and 6 ml isotonic saline, 3 and 6 ml hypertonic glucose, and 6 ml of a contrast agent (sodium metrizoate). In 10 patients with coronary artery disease (group B), CSF was measured after administration of 6 m...

Current methods of measuring myocardial blood flow using 133xenon have failed to separate normals from patients with ischemic heart disease at rest. In the present study such a separation was attempted by utilizing pacing-induced tachycardia (PIT) to stress the myocardium. 133Xenon was injected into the left coronary artery to measure blood flow in 27 patients at rest and during pacing-induced ...