title: Ambulatory monitoring of the ST segment, using direct-recording Holter systems.
abstract: Direct-recording ambulatory electrocardiographic monitoring systems may produce serious errors not only because of their restricted bandwidth, but even more because of the "half-wavelength-to-head-contact effect." This article describes an easy measurement procedure and a mathematic model of the storage medium. The frequency response is calculated by way of five data from a single measurement. Some errors of typical recorders are discussed with the help of synthesized electrocardiographs. Measurements by six different recorders are listed.
authors: Institute for High Frequency Techniques, Faculty of Electrical Engineering, University of the Bundeswehr Munich, Federal Republic of Germany.
authors: J
authors: J
authors: Brose
authors: G
authors: G
authors: Flachenecker
authors: A
authors: A
authors: Frey
mesh_terms: D000553:Ambulatory Care; D003198:Computer Simulation; D004562:Electrocardiography / Q000295:instrumentation*; D004867:Equipment Design; D006801:Humans; D008433:Mathematics; D008991:Monitoring, Physiologic / Q000295:instrumentation*