Hello sir My wife aged 53 is suffering from S V T and is on a dose of 30 mg Dilgem a day. Nearly after every two years she gets a attack of SVT and heart rate goes above 200 and she had to be immediately hospitalized to administer 3 to 5 ml of dilgem intravenously than she becomes normal within 2 hours. Doctors suggest the Laser therapy for the two nerves on the heart. Is it the only treatment for SVT and how safe it is and how much expenses are there, please suggest thanks.