Results 311 to 320 of about 2,184,778 (369)

Electrophysiologic Characteristics of Atria in Patients Without Heart Disease

Pacing and Clinical Electrophysiology, 2005
Background: The significance of atrial fibrillation or tachycardia (AF) induction remains debatable. Some believe that the presence of heart disease (HD) increases the sensitivity and decreases the specificity of programmed atrial stimulation (PAS). There are few data in patients without HD.
Béatrice, Brembilla-Perrot, Daniel, Beurrier, Pierre, Houriez, Christine, Suty-Selton, Marc, Nippert, Olivier, Claudon, Marius, Andronache, Yves, Ernst, Emad, Khaldi, Hadj, Belhakem, Batric, Popovic, Arnaud, Terrier de la Chaise, Pierre, Louis   +12 more
openaire   +2 more sources

The role of the atria in congenital heart disease

Cardiology Clinics, 2002
The atria play an important role in adult congenital heart disease. Atrial function is often altered due to longstanding pressure or volume overload. Cardiac surgery inflicts lasting damage to the atria, which leads to loss of atrial compliance. Both the history of atrial overload and the atrial scarring form substrates for atrial tachycardias.
Meijboom, FJ (Folkert), Roos - Hesselink, Jolien, Sievert, H   +2 more
openaire   +2 more sources

6-NitroDopamine is an endogenous modulator of rat heart chronotropism.

Life Science, 2022
6-Nitrodopamine (6-ND) is released by rat vas deferens and exerts a potent contractile response that is antagonized by tricyclic antidepressants and α1-, β1- and β1/β2-adrenoceptor antagonists.
J. Britto-Júnior, M. D. de Oliveira, Carolina Dos Reis Gati, R. Campos, M. Moraes, M. Moraes, F. Mónica, E. Antunes, G. De Nucci   +8 more
semanticscholar   +1 more source

Neuronal control of heart rate in isolated mouse atria

American Journal of Physiology-Heart and Circulatory Physiology, 2003
A novel mouse isolated atrial preparation with intact postganglionic autonomic innervation was used to investigate the neuronal control of heart rate. To establish whether autonomic activation was likely to alter heart rate by modulating the hyperpolarization-activated current ( If), the L-type Ca2+current ( ICa,L), or the ACh-activated K+current ( IK ...
J K, Choate, R, Feldman
openaire   +2 more sources

Isolation and characterization of glycosaminoglycans from atria of the human heart

International Journal of Biochemistry, 1981
Abstract 1. 1. Five glycosaminoglycans were isolated from tryptic digest of atria of the human heart and were assayed by determining the carbohydrate content of materials. 2. 2. Separation of these 5 polymers was achieved by Dowex 1 × 2 column chromatography. 3. 3.
H, Masuda, S, Shichijo
openaire   +2 more sources

Electrocardiographic behavior of recipient and donor atria after human heart transplantation

The American Journal of Cardiology, 1969
Abstract After human heart transplantation, separate donor and recipient P waves were seen in 7 of 10 patients, and P wave form was changed from the preoperative state. The recipients' P waves responded normally to various degrees of exercise and the Valsalva maneuver, whereas the donor complexes gave a response typical of denervation. The effects of
R D, Leachman, D V, Cokkinos, O, Zamalloa, A, Alvarez   +3 more
openaire   +2 more sources

Specialized tissues and preferential conduction in the atria of the heart

The American Journal of Cardiology, 1971
Abstract Many of the widely prevalent concepts in clinical electrocardiography are based on the premise that the spread of electrical activity in the atria is radial, not following special pathways. This review questions that premise on the grounds of recent electrophysiologic, biochemical and anatomic studies that are more logically interpreted as ...
T N, James, L, Sherf
openaire   +2 more sources

Extraneuronal accumulation of isoproterenol in atria and ventricle of perfused rat heart

Life Sciences, 1988
Extraneuronal accumulation of isoproterenol in atria and ventricle of perfused rat heart was investigated. Rat hearts were perfused with various concentrations of 3H-isoproterenol for 30 min in the absence and the presence of catechol-O-methyltransferase (COMT) inhibitor (tropolone).
T, Magaribuchi, K, Kurahashi, Y, Akimoto, M, Fujiwara   +3 more
openaire   +2 more sources

Separation of the Natural Atria in Experimental Implantation of Total Artificial Heart

Artificial Organs, 1995
Abstract: Atrial connections in a single‐unit total artificial heart (TAH) may be difficult to make because of the rigidity of the device and the fixed position of the atrial inlets. We developed a technique to separate the natural atrial borders in an experimental implantation of a unitary TAH.
O H, Frazier, R, Matsuwaka, S M, Parnis, N, Furusho, M G, McGee, J M, Fuqua   +5 more
openaire   +2 more sources

Atrial fibrillation in heart failure: Current treatment of patients with remodeled atria

Current Heart Failure Reports, 2008
Atrial fibrillation (AF) and chronic heart failure (CHF) can be caused by each other, and therefore constitute a vicious circle. The prevalence of both conditions is about 1% in industrialized countries and increases with age. Although mortality is increased in heart failure, the additional prognostic relevance of AF in these patients is less clear. AF
Hans-Ruprecht, Neuberger, Jan-Christian, Reil, Oliver, Adam, Ulrich, Laufs, Christian, Mewis, Michael, Böhm   +5 more
openaire   +2 more sources