Abstract:
OBJECTIVE:To determine the effect of acute left ventricular dilatation on refractoriness in normal hearts. METHODS:During sustained ventricular fibrillation (VF) in isolated perfused hearts, recording of local activation time yields VF intervals which provide an index of local refractoriness. Simultaneous measurement from multiple sites enables study of spatial aspects of changes in refractoriness. We studied the effects of stretch on the magnitude and dispersion of changes in VF interval in 10 isolated, Langendorff-perfused rabbit hearts using a flexible epicardial array containing 240 unipolar electrodes. The left ventricular pressure was increased from 0 to 40 mmHg by inflation of an intraventricular balloon during sustained VF. RESULTS:The current threshold for VF induction fell from 64 +/- 11 mA to 43 +/- 11 mA (mean +/- SE, P < 0.01) following ventricular dilatation. Mean VF interval at 0 mmHg was 79.8 +/- 1.3 ms and fell to 70.2 +/- 1.7 ms (P < 0.01) at 40 mmHg. There was a corresponding increase in dispersion of VF interval (coefficient of variation) from 8.13 +/- 0.8 to 13.3 +/- 0.8 (P < 0.01). There was regional heterogeneity in the areas of greatest reduction in VF interval, which varied between hearts. Following balloon inflation there was an increase in the number of activation waves. CONCLUSIONS:Acute ventricular dilatation produces spatially heterogeneous changes in refractoriness which would predispose to the maintenance of reentrant arrhythmias.
journal_name
Cardiovasc Resjournal_title
Cardiovascular researchauthors
Burton FL,Cobbe SMdoi
10.1016/s0008-6363(98)00092-3subject
Has Abstractpub_date
1998-08-01 00:00:00pages
351-9issue
2eissn
0008-6363issn
1755-3245pii
S0008636398000923journal_volume
39pub_type
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更新日期:2016-03-01 00:00:00
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更新日期:2005-01-01 00:00:00
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更新日期:2018-09-01 00:00:00
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更新日期:2020-07-15 00:00:00