Apparatus and method for blocking activation of tissue or conduction of action potentials while other tissue is being therapeutically activated

   
   

A desired effect is produced by therapeutically activating tissue at a first site within a patient's body and a corresponding undesired side effect is reduced by blocking activation of tissue or conduction of action potentials at a second site within the patient's body by applying high frequency stimulation and/or direct current pulses at or near the second site. Time-varying DC pulses may be used before or after a high frequency blocking signal. The high frequency stimulation may begin before and continue during the therapeutic activation. The high frequency stimulation may begin with a relatively low amplitude, and the amplitude may be gradually increased. The desired effect may be promotion of micturition or defecation and the undesired side effect may be sphincter contraction. The desired effect may be defibrillation of the patient's atria or defibrillation of the patient's ventricles, and the undesired side effect may be pain.

 
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