Complete atrial dissociation versus diaphragmatic action potentials.
نویسندگان
چکیده
منابع مشابه
Atrial dissociation.
Atrial dissociation is characterized by two sets of independent P waves on the electrocardiogram and two atrial beats independent of each other. One atrium is under the control of the dominant pacemaker (sinus node) which also controls the ventricles, while the other atrium or part of the other atrium is under the control ofan ectopic pacemaker, resulting in unilateral ectopic atrial rhythm, be...
متن کاملAlternans of atrial action potentials during atrial flutter as a precursor to atrial fibrillation.
BACKGROUND The mechanisms underlying the transition of typical atrial flutter (Afl) to fibrillation (AF) remain unclear. We set out to test the hypothesis that Afl disorganizes to AF via alternans of atrial action potentials. METHODS AND RESULTS In 38 patients with Afl, monophasic action potentials (MAPs) were recorded at the isthmus and either high or low right atrium (HRA, LRA) during overd...
متن کاملAtrial dissociation and double atrial arrhythmias.
Two independent sets of P waves have occasionally been observed in the electrocardiograms of experimental animals and attributed to dissociated activity of the two atria (Condorelli, 1929; Scherf and Siedek, 1934). The studies of Marcel and Exchaquet (1938) on the human fetus strongly suggest that atrial dissociation occurs in man, and electrocardiograms have also been illustrated and reported ...
متن کاملMembrane Potentials and Action Potentials
Electrical potentials exist across the membranes of virtually all cells of the body. In addition, some cells, such as nerve and muscle cells, are capable of generating rapidly changing electrochemical impulses at their membranes, and these impulses are used to transmit signals along the nerve or muscle membranes. In other types of cells, such as glandular cells, macrophages, and ciliated cells,...
متن کاملAction Potentials'
lntracellular Caz+, K+, CI-, and NOsactivities were measured with ion-selective microeledrodes in the liverwort Conocephalum conicum 1. at rest, during dark/light changes, and in the couese of adion potentials triggered by light or electrical stimuli. l h e average free cytosolic Caz+ concentration was 231 f 65 nM. We did not observe any light-dependent changes of the free cytosolic Caz+ concen...
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ژورنال
عنوان ژورنال: Heart
سال: 1974
ISSN: 1355-6037
DOI: 10.1136/hrt.36.5.452