Action potential duration alternans in dog Purkinje and ventricular muscle fibers. Further evidence in support of two different mechanisms

Circulation
H SaitohB Surawicz

Abstract

An abrupt shortening of cycle length causes action potential duration (APD) alternation in both canine Purkinje (P) and ventricular (V) muscle fibers. Our recent study suggested that APD alternans is determined by the process controlling APD during electrical restitution in P but not in V fibers. In the latter, alternans was attributed to changes in the availability of intracellular calcium [Ca2+]i. We examined this hypothesis further with the following pharmacologic probes known to alter restitution or action of [Ca2+]i: tetradotoxin (0.5-3.0 microM), lidocaine HCl (2.0-12.0 micrograms/ml), sotalol (10 microM), nicorandil (10-20 microM), 4-amino-pyridine (0.5 microM), ryanodine (10 microM), caffeine (2 mM), and ARL 115 BS (100 microM). Alternans in P fibers persisted under all studied conditions but varied in magnitude depending on the time constant and amplitude of restitution. In V fibers, the magnitude of alternans did not correlate with APD changes during restitution, and APD alternans was associated with the alternans of action potential shape and alternans of developed tension. Alternans in V was suppressed by caffeine at 2.0 mM [Ca2+]o when tension was increased and by ryanodine at 1.0 mM [Ca2+]o when tension was decrea...Continue Reading

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Related Concepts

Myocardial Contraction
Structure of Purkinje Fibers
DRUG Screen Quant Caffeine
Calcium [EPC]
Pyridines
Calcium
Protoplasm
Action Potentials
Sotalol
Tetrodotoxin

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