Linked Life Data

2276592

Source:http://linkedlifedata.com/resource/pubmed/id/2276592

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1991-3-1
pubmed:abstractText
1. Conventional microelectrode techniques were used to study the effect of quinidine (10 microM), lidocaine (20 microM), and verapamil (3-10 microM) on action potential upstroke (V+ max) in frog skeletal muscle and dog Purkinje fiber. 2. The frequency-dependent nature of V+ max depression induced by these drugs was similar in both preparations, however, quinidine was more potent in skeletal muscle while lidocaine was in Purkinje fibers. 3. In skeletal muscle tetrodotoxin (3 and 15 nM) and low concentrations of antiarrhythmic drugs proportionally reduced the maximum velocity of depolarization and repolarization (V+ max and V- max, respectively), whereas V- max was more depressed than V+ max by high concentrations (50-200 microM) of antiarrhythmics. Decreases in the overshoot potential were proportional to the V+ max block in the case of each drug. 4. These results indicate that therapeutically relevant concentrations of quinidine and lidocaine inhibit skeletal muscle Na+ channels in a use-dependent manner similar to heart, while at higher concentrations the K+ channels may also be blocked. Therapeutic implications of the results are discussed.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0306-3623
pubmed:author
pubmed:issnType
Print
pubmed:volume
21
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
747-51
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Use-dependent action of antiarrhythmic drugs in frog skeletal muscle and canine cardiac Purkinje fiber.
pubmed:affiliation
Department of Physiology, University Medical School of Debrecen, Hungary.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't