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Experimental Model. A: twisting the lead around longitudinal axis (corkscrew) on one end while the other is fixed results in this unique lead appearance; B: to simulate the real case we use a similar pulse generator and lead; C: maintaining the electrode tip fixed, the generator is rotated clockwise and counterclockwise. D: twisting appearance after two laps; E: twisting appearance after four laps; F: twisting appearance after six laps.
