(1) In the absence of atrial dilatation there was minimal stimulus for ANF secretion.
(2) In patients with coronary artery disease, electrocardiographic signs of left atrial enlargement (LAE-negative P wave deflection greater than or equal to 1 mm2 in lead V1) are associated with increased left ventricular end diastolic pressure (LVEDP).
(3) Arteries treated with atrial natriuretic peptide showed no alterations in relaxation or cGMP content after incubation with pertussis toxin.
(4) During electrophysiologic study, the effect of propafenone on the effective refractory period of the accessory pathway was determined, as well as its effect during orthodromic atrioventricular (AV) reentrant tachycardia and atrial fibrillation.
(5) The patients were classified into two groups according to the presence (n = 166) or absence (n = 176) of documented episodes of atrial fibrillation preoperatively.
(6) Stimulation of atrial H1-receptors is suggested to directly cause an increase in Ca-channel conductance independent of intracellular cAMP content.
(7) The plasma levels of atrial natriuretic factor (ANF) were measured both during relapse and remission in 8 patients with idiopathic, minimal-lesion nephrotic syndrome.
(8) Atrial extrasystoles and short sequences of atrial tachycardias were observed in most dogs after occlusion.
(9) This report represents the first comprehensive description of instantaneous and continous phasic blood velocity at the mitral valve during atrial arrhythmias in man.
(10) The present investigation has shown that the atrial receptors with a Paintal Type A pattern of discharge are relatively rare in both dogs and rabbits.
(11) Water immersion (WI) to the neck induces prompt increases in central blood volume, central venous pressure, and atrial distension.
(12) A patient with mitral stenosis and atrial flutter was found to have a normal diastolic closure rate (E to F slope).
(13) Similar results with carbachol in the presence of 8-bromo cyclic AMP and IBMX were also found in rat right atrial strips which had been incubated with [3H]-noradrenaline.
(14) Atrioventricular (AV) delay that results in maximum ventricular filling and physiological mechanisms that govern dependence of filling on timing of atrial systole were studied by combining computer experiments with experiments in the anesthetized dog instrumented to measure phasic mitral flow.
(15) The interobserver variability of these indices is low (r greater than 0.96); reproducibility is good in patients with sinus rhythm but mediocre in atrial fibrillation.
(16) Three cases of simultaneous atrial and a-v junctional tachycardia, related to the administration of digitalis and occurring in a short period of 16 months, are reported.
(17) This study demonstrates that 1) complete AV block is not a contraindication to the Fontan operation, 2) some patients may not require AV synchrony postoperatively for survival, and 3) postoperative atrial flutter or fibrillation may cease or be easier to control after the Fontan operation.
(18) Echocardiographic findings included an abrupt midsystolic, posterior motion (greater than 3 mm beyond the CD line) in five patients, multiple sequence echoes in six, and posterior coaptation of the mitral valve near the left atrial wall in six.
(19) A block of tissue bounded by the ostium of the coronary sinus, the pars membranacea, the septal leaflet of the tricuspid valve and the atrial and ventricular septa is removed.
(20) All patients with emboli were in atrial fibrillation.
Atrium
Definition:
(n.) A square hall lighted from above, into which rooms open at one or more levels.
(n.) An open court with a porch or gallery around three or more sides; especially at the entrance of a basilica or other church. The name was extended in the Middle Ages to the open churchyard or cemetery.
(n.) The main part of either auricle of the heart as distinct from the auricular appendix. Also, the whole articular portion of the heart.
(n.) A cavity in ascidians into which the intestine and generative ducts open, and which also receives the water from the gills. See Ascidioidea.
Example Sentences:
(1) Injection of carbachol into the AV3V produced the expected natriuresis, which was accompanied within 20 min by a dramatic rise in the plasma ANP concentration and a rise in ANP content in the medial basal hypothalamus, the neurohypophysis, and particularly the anterior hypophysis but without alterations in the content of ANP in the lungs or the right or left atrium.
(2) Transesophageal echocardiography (TEE) is a semi-invasive examination that provides better images of the atrium than classical transthoracic echocardiography (TTE) due to the anatomical positioning of the captor and the high frequency Doppler apparatus used.
(3) We report a case of tamponade due to an effusion of blood which had occurred two weeks after an aorto-coronary bypass and was unusually located behind the left atrium.
(4) The radio-activity of 99mTc of the entire cardiac blood pool including the large vessels (T), the right ventricle including the right atrium (RV) and the left ventricle (LV) was calculated from the 30 degrees anterior oblique cardiac pool scintigram.
(5) Each study consisted of a 2-h control period followed by 4 h of increased lung microvascular pressure produced by inflation of a balloon in the left atrium.
(6) Ultrastructurally, the atrial myocardial cells in all three patients were hypertrophied, and two patients had evidence of focal cell degeneration; the atrium was markedly dilated, but atrial arrhythmias were not noted.
(7) Multiple determination of size, shape, and diameter of the left atrium were made during the control state and under conditions of varied ventricular outflow resistance in intact anesthetized dogs with markers chronically attached to the mitral annulus and the valve cusps.
(8) The right atrium thrombosis in the region of Chiari network resulted in the thromboembolism of the left pulmonary artery this being an immediate cause of death.
(9) Just prior to the end of the infusion period, 51Cr-labeled microspheres were injected into the left atrium to measure regional myocardial blood flow.
(10) Two-dimensional echocardiography revealed enlargement of the left ventricle, left atrium, and aortic root as well as dilatation of the left main coronary artery.
(11) The fistula was ligated by an access through the right atrium with good nearest and long-term results.
(12) M-mode and two dimensional echocardiography demonstrated abnormal echoes in the left atrium, the density being 22.7 Hounsfield Unit.
(13) His bundle recordings and premature atrial stimulation from coronary sinus, mid-right atrium and high-right atrium were performed in a patient with repetitive supraventricular tachycardias.
(14) Earlier surgical correction of this disorder was associated with the problem of stenosis at the anastomotic site with the left atrium.
(15) Although the histologic changes in the right atrium and contralateral lung are worrisome, no cardiac nor pulmonary problems arose over the 1 year follow-up.
(16) The visualized turbulent flow was consistent with a ventriculoseptal defect but also appeared to extend posteriorly into the left atrium in a direct line with the septal communication.
(17) After control conditions were established, PDG was injected into the right atrium.
(18) Echocardiograms showed good left ventricular function and a large coil of apparent thrombus in the right atrium prolapsing into the right ventricle.
(19) An unusual appearance of echoes behind the aorta bulging into the left atrium in diastole on both the M-mode and cross-sectional echo suggested this diagnosis prior to cardiac catheterization.
(20) Inotropic and chronotropic effects were determined in vitro in cat papillary muscle and right atrium, respectively.