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- W1978001275 abstract "The effects of left atrial enlargement on atrial cell electrophysiology and structure were studied in dogs with mitral valve fibrosis. Thirteen dogs (Group I) had left atrial enlargement and intermittent atrial arrhythmias; 10 dogs (Group II) had left atrial enlargement and chronic atrial fibrillation. The resting and action potentials of cells in isolated preparations from the enlarged left atrium were found not to differ from those in the nonenlarged right atrium or in the atrium of control dogs. The resting and action potentials of cells in Group II atria did not differ significantly from those in Group I atria. Some cells (15 percent of the total studied) in the atria of dogs in Groups I and II were inexcitable, but either superfusion with acetylcholine or norepinephrine restored excitability. The structural studies showed that the left atrium of the dogs in Groups I and II had a reduced number of muscle cell layers spanning the wall with an unusually large amount of connective tissue between greatly hypertrophied cells. Very few degenerating cells were seen. Dramatic abnormalities of cell electrophysiology may not be involved in the genesis of arrhythmias in the enlarged canine atrium, and the altered morphologic features of the atrium in these dogs may be important in the genesis of persistent atrial arrhythmias." @default.
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- W1978001275 date "1982-06-01" @default.
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- W1978001275 title "Effects of left atrial enlargement on atrial transmembrane potentials and structure in dogs with mitral valve fibrosis" @default.
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- W1978001275 doi "https://doi.org/10.1016/0002-9149(82)90208-9" @default.
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