Modified Extension Study to the SUmiT Trial: Evaluation of Long Term Therapy With Percutaneous Tibial Nerve Stimulation (PTNS) for Overactive Bladder Symptoms

Inclusion Criteria: * Subjects who signed the informed consent and were eligible to participate in the original SUmiT Trial * Subjects who were randomized and treated with the active PTNS therapy during their participation in the original SUmiT Trial * Subject must be a positive responder from initial 12 weekly treatments as prescribed in original SUmiT Trial - 13 week GRA questionnaire must indicate "moderately" or "markedly improved" on question #1 of GRA * Subjects must not have started any antimuscarinics treatment since completion of original SUmiT Trial * Subjects must not have started any urologic Botox treatment since completion of original SUmiT Trial * Subjects must remain off all antimuscarinics throughout participation in trial * Subjects must initiate PTNS maintenance therapy within 2 weeks of their last PTNS treatment as part of SUmiT protocol UPC082008 * Capable of giving informed consent * Capable and willing to follow all study-related procedures for up to 33 months for a total participation of 3 years Exclusion Criteria: * Pregnant as confirmed by urine pregnancy test, or plans to become pregnant during the study period * Subjects who were not able or willing to follow original SUmiT Trial study schedule