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Monomorphic and polymorphic, in this context, refer to the shape of the ECG tracing. In monomorphic ("same shape") tachycardia, the QRS complexes all look about the same, indicating that the elevated heart rate is due to electrical signals originating in about the same location in the heart. In polymorphic ("many shape") tachycardia, the QRS complexes look different from each other, indicating that the signals generating the elevated heart rate are coming from various locations in the heart.

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