In this study, the investigators will evaluate the efficacy of Bladder Thermal Distention (BTD) in patients with overactive bladder syndrome who failed previous treatment of anticholinergic drugs.

The investigators' hypothesis is that it will improve the storage symptoms.

Inclusion criteria:

1. Patients with overactive bladder syndrome
2. Detrusor Overactivity proven in urodynamic test

Exclusion criteria:

1. Mixed urinary incontinence
2. Active urinary tract infection
3. Urethral Stricture

Outcome measures:

1. Bladder Diaries
2. Urgency questionnaire

Inclusion Criteria:

• Patients with overactive bladder syndrome
• Detrusor Overactivity proven in urodynamic test

Exclusion criteria:

• Mixed urinary incontinence
• Active urinary tract infection
• Urethral Stricture