OBJECTIVE To determine the effect of changes in autonomic tone induced by phenylephrine infusion on atrial refractoriness and conduction. DESIGN Left and right atrial electrophysiological properties were measured before and after a constant phenylephrine infusion designed to increase sinus cycle length by 25%. SUBJECTS 20 patients, aged 53 (SD 6) years, undergoing electrophysiological study...

The effect on the right atrial pressure and oxygen saturation of expansion of the plasma volume by rapid infusion of 500 ml. 5 per cent glucose has been studied in I4 patients with recent uncomplicated cardiac infarction, and in 5 patients with cardiogenic shock. The findings are contrasted with the effect of intravenousfrusemide (40 mg.) in 8 patients with recent cardiac infarction complicated...

A TRIAL myxomas can be successfully removed.1-5 Apparently left atrial myxonlas are infrequent and those in the right atrium are approximately 25 per cent as common.6 Bahnson and Newman7 in 1953 reported the first removal of a right atrial myxoma and since that times 4 others have been operated upon. Ripstein8 in 1953 attempted unsuccessfully to remove a right atrial myxoma through the open rig...

Right atrial (RA) volumes were calculated from biplane cineangiocardiograms obtained during diagnostic cardiac catheterization in twenty-nine patients with normal right hearts. Validation of methodology was performed with calculations of right atrial casts of 14 human right atria. An excellent correlation of known and calculated volume was obtained either with a Simpson's rule method, r = 0.999...

Right atrial scars participating in macro reentrant tachycardia circuits are generally seen in patients following cardiac surgery for congenital heart disease. Right and left atrial scars without any prior cardiac surgery have been reported but are rare [1,2]. A 65 year old farmer had recurrent drug refractory atrial tachycardia for which he underwent an EP study with three dimensional mapping ...

as fetal compensation against hypoxemia progresses, the afterload on the heart and peripheral vascular resistance increases. eventually, the right heart fails, which is transmitted to the fetal venous system, causing decreased flow during late diastole or atrial contraction and increased resistance in the ductus venosus and inferior vena cava. the ductus has forward flow during atrial contracti...

The first successfully diagnosed and treated case of aorta-right atrial tunnel was reported by Coto et al. in 1980. The most common cause of aorta-right atrial tunnel is a ruptured aneurysm of the sinus of Valsalva. Sinus of Valsalva aneurysms had been reported as early as 1840 by Thurnam; these were diagnosed at autopsy. With the advances in radiology, many cases of aorta-right atrial tunnel h...

A TRIAL myxomas can be successfully removed.1-5 Apparently left atrial myxonlas are infrequent and those in the right atrium are approximately 25 per cent as common.6 Bahnson and Newman7 in 1953 reported the first removal of a right atrial myxoma and since that times 4 others have been operated upon. Ripstein8 in 1953 attempted unsuccessfully to remove a right atrial myxoma through the open rig...