<prompt>  A 36 year old female recurrent chest pain and palpitation varying in duration and severity and 6-7 ectopics per minute Possibly supraventrigation is not related to exertion. Her BP is 86 mm Hg and pulse rate is 86min. The ideal investigation isEchocardiographyElectrophysiological studiesThallium studyTechnetium pyrophosphate 