title: On-line mapping system for the visualization of the electrical activation of the heart.
abstract: A simple but still versatile datalogging system based on a VCR (video cassette recorder) has been developed. The VCR allows mass storage of data originating from a maximum of 256 channels as used, for example, in the recording of the time-dependent potential distribution at the surface of the myocardium. Incorporated in the system is a display memory allowing on-line simultaneous visualization of the assessed recordings of 16 channels. On an interactive base display parameters (time-window, channel-selection) can be altered without loss of data. A link with a personal computer allows modification of system parameters and storage of data for off-line analysis of the recorded data. The high data rate to and from the VCR (4.3 MHz) fully utilizes the bandwidth available. A normal videotape can, therefore, contain up to 2 Gigabyte of data. Despite this, the use of the tapecounter and the decoding of the time-code inserted into the signal allows quick retrieval of the stored data without needing expensive equipment. The system described brings mass data logging within the reach of a vast number of laboratoria and cardiovascular centers.
authors: Department of Physiology, University of Limburg, Maastricht, The Netherlands.
authors: M A
authors: MA
authors: Allessie
authors: A P
authors: AP
authors: Hoeks
authors: G M
authors: GM
authors: Schmitz
authors: R S
authors: RS
authors: Reneman
mesh_terms: D000818:Animals; D004594:Electrophysiology / Q000295:instrumentation* / Q000379:methods; D006329:Heart Conduction System / Q000502:physiology*; D006801:Humans; D009862:Online Systems; D014743:Videotape Recording / Q000295:instrumentation*