<prompt> A 36 year old female recurrent chest pain and palpitation varying in duration and severity and 6-7 ectopics per minute not related to exeion. Her BP is 86 mm Hg and pulse rate is 86min. The ideal investigation is-EchocardiographyElectrophysiological studiesThallium studyTechnetium pyrophosphate  <response>: An electrocardiogram -- abbreted as EKG or ECG -- is a test that measures the electrical activity of the heabeat. With each beat, an electrical impulse or wave travels through the hea. This wave causes the muscle to squeeze and pump blood from the hea. assess your hea rhythm. diagnose poor blood flow to the hea muscle ischemia diagnose a hea attack. diagnose abnormalities of your hea, such as hea chamber enlargement and abnormal. electrical conduction . Ref Harrison 20th edition pg 51 