Document Detail


Ischaemia induced alternans of action potential duration in the intact-heart: dependence on coronary flow, preload and cycle length.
MedLine Citation:
PMID:  8262089     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Clinical and experimental evidence relate action potential duration (APD) alternans to ischaemic heart disease and ventricular arrhythmias. The present investigation was performed to study the quantitative relationship between APD alternans and the degree of ischaemia, loading conditions and cycle length (CL) in an intact heart. Monophasic action potentials (MAP) were simultaneously recorded by contact electrodes from two left (LV) and one right ventricular (RV) sites in 20 Langendorff-perfused rabbit hearts. The preparations were subjected to global ischaemia at flow rates ranging from 40% of normal flow to complete cessation of flow. Pacing was performed at either constant or regularly changing CL. The magnitude of APD alternans was expressed as beat-to-beat differences in action potential duration of two consecutive MAPs. During normal perfusion, neither very fast pacing at a CL of 200 ms nor periodical rate switches resulted in persistent APD alternans. Pacing at a constant CL of 800 ms did not induce APD alternans at complete cessation of flow for 6 min. However, alternans developed progressively at a constant CL of 400 ms after 2.8 +/- 0.3 min of complete ischaemia at the pre-loaded LV, and after 4.6 +/- 0.4 min at the unloaded RV (P < 0.01). The reduction of preload at the LV from 15 to 5 mmHg end-diastolic pressure delayed development of APD alternans from 2.8 +/- 03 min to 4.3 +/- 0.4 min (P < 0.05) at 400 ms CL. Following graded underperfusion of 40%, 20% and 10% of initial flow, persistent APD alternans developed in relation to the degree of flow reduction and increased progressively with duration of ischaemia. APD alternans at the LV always preceded the onset of APD alternans at the RV. In experiments with identical flow rates the shortest CL of 200 ms resulted in the greatest and earliest initiation of APD alternans compared to the longer CL (P < 0.01, P < 0.001). An increase in CL from 400 to 800 ms immediately abolished APD alternans, generated by the shorter CL, at any time during the 6 min period of complete ischaemia. Similarly, increasing the cycle length from 200 or 400 to 600 ms eliminated APD alternans up to 6 min of ischaemia and significantly reduced its magnitude between 7 and 10 min within a few beats. We conclude that persistent APD alternans is a characteristic findings in the rabbit heart during global ischaemia4 It is a sensitive parameter of the severity of ischaemia and depends.(ABSTRACT TRUNCATED AT 400 WORDS)
Authors:
R W Kurz; R Mohabir; X L Ren; M R Franz
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  European heart journal     Volume:  14     ISSN:  0195-668X     ISO Abbreviation:  Eur. Heart J.     Publication Date:  1993 Oct 
Date Detail:
Created Date:  1994-01-27     Completed Date:  1994-01-27     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8006263     Medline TA:  Eur Heart J     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1410-20     Citation Subset:  IM    
Affiliation:
First Medical Department, Donauspital, Vienna, Austria.
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MeSH Terms
Descriptor/Qualifier:
Animals
Arrhythmias, Cardiac / physiopathology*
Blood Pressure / physiology
Cardiac Pacing, Artificial
Coronary Circulation / physiology
Electrocardiography*
Heart Ventricles / physiopathology*
Male
Myocardial Ischemia / physiopathology*
Perfusion
Rabbits
Ventricular Function, Left / physiology
Ventricular Function, Right / physiology
Grant Support
ID/Acronym/Agency:
R29-HL40483/HL/NHLBI NIH HHS
Comments/Corrections
Comment In:
Eur Heart J. 1994 Apr;15(4):580-1   [PMID:  8070489 ]

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