heart electrical conduction measurement monophasic action potential 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 2018-11-26T13:03:49Z clinical_measurement_ontology VT:2000017 sjwang CMO:0002860