- To determine if the T-PTNS is not inferior in the short term (3 months) to one of the usual pharmacological treatments (Solifenacin) in the treatment of SVHI and with respect to the percentage of patients that improve 50% any of the 3 signs (Urinary frequency, diurnal / nocturnal frequency, urgency and urinary incontinence). - To determine prognostic factors associated with insufficient improvement (less than 50% in the 3 main signs of SVHI (urinary frequency, urgency and urinary incontinence frequency) after treatment with T-PTNS and Solifenacin.