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Effects of tolterodine (A) and terodiline (B) on STV and triangulation as a function of APD90 change under stimulation frequencies of 1 and 2 Hz. Note for tolterodine, there is a linear relationship between triangulation, STV, and APD90. While for terodiline, there is an accelerated change in triangulation compared to changes in APD90 and there is also an accelerated change in STV at a stimulation frequency of 2 Hz.
