Fig. 1. Voltage responses for a 0.489 mA square waveform current pulse measured across a fixed 4.92 kΩ (displaced + 2.5 V for display purposes) and across a tissue/electrode system using a 22-gauge Stimuplex needle (D. Braun Medical, Bethlehem, PA) inserted to a depth of 5 mm with several return electrode configurations .

Fig. 1. Voltage responses for a 0.489 mA square waveform current pulse measured across a fixed 4.92 kΩ (displaced + 2.5 V for display purposes) and across a tissue/electrode system using a 22-gauge Stimuplex needle (D. Braun Medical, Bethlehem, PA) inserted to a depth of 5 mm with several return electrode configurations .

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