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- W3140139482 abstract "The effects of pharmacologically induced changes in myocardial properties on diastolic mitral valve mechanics were studied in five open-chest dogs. After the induction of complete atrioventricular block, the dogs were subjected to a protocol of programmed pacing. During prolonged diastolic pauses, programmed atrial contractions were induced at progressively increasing coupling intervals. Echocardiographically determined mitral valve reopening time was established for each coupling interval in the control state as well as under the influence of calcium or verapamil. Compared with control, calcium caused an increase in myocardial tension from 23.8 +/- 3.0 to 30.0 +/- 4.6 g/cm2 (mean +/- SD, p less than .005) as well as an increase in mean septal contraction and relaxation velocities from 142 +/- 25.9 and 144 +/- 15.2 mm/sec to 188 +/- 21.7 and 174 +/- 19.5 mm/sec, respectively (each p less than .001). Conversely, verapamil caused a decrease in mean myocardial tension from 23.8 +/- 3.0 to 19.4 +/- 5.3 g/cm2 ..." @default.
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- W3140139482 date "1986-01-01" @default.
- W3140139482 modified "2023-09-26" @default.
- W3140139482 title "Diastolic 'locking' of the mitral valve: possible importance of diastolic myocardial properties." @default.
- W3140139482 hasPublicationYear "1986" @default.
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