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ectopic firing
, a chemical mediator of inflammation, provoked the ectopic firing of nerve roots in a canine in vitro model which indicates that it may play a part in the irritation of nerve roots.
      
Effect of sodium channel blocker (mexiletine) on pathological ectopic firing pattern in a rat chronic constriction nerve injury
      
We studied the efficacy of mexiletine as a sodium channel blocker for neuropathic pain by investigating the effect of mexiletine on the pathological ectopic firing pattern in a chronic constriction nerve injury (CCI) model.
      
After breeding 7 days, the frequency and pattern of ectopic firing antidromically recorded from the sural nerve and the amplitude of antidromic sensory nerve-evoked potential were analyzed.
      
Mexiletine significantly suppressed spontaneous firing frequency, an on-off firing pattern that consisted of cyclic bursting spikes and ectopic firing generation under the hypoxic condition.
      
Mexiletine suppressed ectopic firing by blocking activity of the abnormal sodium channel at the nerve-injured site and dorsal root ganglion without blocking nerve conduction.
      
These foci have atrial muscle fiber extensions which have electrophysiological characteristics essential to generation of focal ectopic firing.
      
Both studies, which were carried out in the cat, reported a much higher incidence of spontaneous ectopic firing in muscle nerves.
      
Damage to peripheral nerves induces ectopic firing in sensory neurons, which can contribute to neuropathic pain.
      
Finally, both spontaneous and evoked ectopic firing appear to play a major role in neuropathic allodynia and hyperalgesia.
      
In the present study we found that after infra-orbital nerve axotomy TG neurons display ectopic firing and augmented excitability.
      
Slow sodium-dependent potential oscillations contribute to ectopic firing in mammalian demyelinated axons.
      
The increased neuronal excitability and ectopic firing may play a major role in neuropathic pain.
      
Unfortunately, following individual axons over the long interval required for the emergence of ectopic firing requires heroic effort.
      
We compared the prevalence of ectopic firing originating in nerve-end neuromas of nerves serving muscle and skin in the rat.
      
 

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