| In a unipolar system, electric current moves from the pulse generator through the pacing lead to the negative pole at the tip of the pacing lead. From there, it stimulates the heart and returns to the pulse generator’s metal surface (the positive pole) to complete the circuit.
| In a bipolar system, current flows from the pulse generator through the pacing lead to the negative pole at the tip. At that point, it stimulates the heart and then travels to the positive pole within the pacing lead to complete the circuit.
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