منابع مشابه
The Wenckebach phenomenon in sino-atrial block.
Disturbances in conduction analogous to those occurring at the atrio-ventricular (A-V) node may be present at the sino-atrial (S-A) junction. When second degree block occurs at the S-A junction, it may adopt the form of the Wenckebach phenomenon. Early descriptions of this arrhythmia were presented by Wenckebach (1906), Rihl (1908), and Wenckebach and Winterberg (1914). There have been relative...
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In one patient reprodncibk episodes of sMal tachyear(200 msec, control; 70 msec, atropine) and sustained dia conld be elicited via programmed atrial premature atrial tachycardia no longer could be elicited. These dcpoluizations. Evllodion of the elechpphysiologic studies mpport the concept that h a t t i a l reciprocation shldks suggested that the most tikely mechanism was can be a mechanism re...
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What is the electric field used for? Strongly electric fish have an electric organ discharge that is powerful enough to stun prey and to discourage potential predators. The brief, intermittent discharge pulses generated by strongly electric fish can range up to several hundred volts. In contrast, weakly electric fish generate a discharge that is typically less than a single volt. These discharg...
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Genetically modified mice provide a number of models for studying cardiac channelopathies related to cardiac Na(+) channel (SCN5A) abnormalities. We review key pathophysiological features in these murine models that may underlie clinical features observed in sinus node dysfunction and progressive cardiac conduction disease, thereby providing insights into their pathophysiological mechanisms. We...
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Rat isolated right atria obtained 1 wk after sinoaortic denervation were less sensitive to the chronotropic actions of beta-agonists than were tissues obtained from animals that underwent sham surgery or no surgery at all. The potencies, but not the maximal responses for two high efficacy agonists, norepinephrine and isoproterenol, were reduced about 3- to 4-fold. Sino-aortic denervation (SAD) ...
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ژورنال
عنوان ژورنال: Cardiovascular Research
سال: 2016
ISSN: 0008-6363,1755-3245
DOI: 10.1093/cvr/cvw171