heart electrical conduction measurement Monophasic action potential 2018-11-26T13:03:49Z Monophasic action potentials (MAPs) are recorded using contact electrode catheters. The recordings provide local information about the actual cellular depolarization and repolarization process of myocardial tissue. They are different from body surface electrocardiographic (ECG) recordings or standard endocardial electrograms, which produce a summative or derivative view of the heart's electrical activity sjwang