The Sinusoidal Current
THE SINUSOIDAL CURRENT is an alternating one, combin¬ing high-frequency and low galvanic sinusoidal currents. The alternations may be very rapid or very slow. There may be surging or non-surging currents, the surge being a gradual rise of current strength alternating with a gradual fall. This, when applied over muscle-tissue, causes alternate contraction and relaxation (rest). The sinusoidal currents are generated or produced by means of special instruments, and have their place in the treatment of numerous abnormal conditions. Chief among their uses, perhaps, is the production of muscular con¬traction in cases of paralysis resulting from nerve injury-after the nerve itself has been sufficiently repaired to respond to the stimulation. But they are also useful in other condi¬tions, such as muscular atrophy, partial ankylosis, adhesions, uterine prolapse, and infantile uterus. Because of the pro¬nounced muscular contraction it produces, the “Morse wave,” one of these sinusoidal currents, is of great value in cases of ptosis (dropping) of abdominal organs and intestinal stasis or constipation.