Originally Posted by
sdkashif
The faradic current has a frequency of 50 Hz and hence so produces the tetanic muscle contraction. It is ,therefore, surged to produce the alternate contraction and relaxation of the muscles. Moreover, faradic current having short pulse duration can not be used to stimulate dennervated muscles as dennervated muscles requre pulses of longer duration for having its effects. So galvanic current has fair long duration impulses selections that can be used to stimulate dennervated muscles. Although in early days of nerve injury a response of muscle can be obtained witth faradic or faradic type of current depending upon the reaction of degeneration but when walerian degenration takes place, it is not possible to get the response from faradic type of current. Furthermore, facial muscles are very delicate and soft as they can tolerate the tetanic type of contraction produced by faradic current and this could lead to the secondary contractures of the facial muscle. Hence the most suitable current in that case will be interrupted galvanic current, that produces a brisk twitches of the facial muscles. And there will no danger secondary contractures.