title: A computer analysis of cardiac electrograms.
abstract: Computer programs were constructed for the temporal analysis of 8 electrograms obtained from various regions of isolated dog hearts. The electrograms were recorded on photosensitive paper. A computer program written in the Fortran II language allowed an x-y digitizing table to be used to input the coordinates of each electrogram into a computer. Each electrode recording within a given cardiac cycle was digitized in this manner, and the temporal intervals between the 28 combinations of electrode pairs were calculated. The program also computed the heart rate and cardiac cycle length. Subroutine options permitted the grouping of data into experiment, record, and event numbers. All data were stored on a magnetic disk. A separate computer program written in the Fortran IV language performed basic statistical operations on each of the data files. The computer system described in the present report accurately and reliably processed over 10,000 cardiac cycles. Such a system can be used to analyze large amounts of data from sources other than electrograms. Temporal analysis of the standard electrocardiogram is offered as an example of the versatility of the programs.
mesh_terms: D000818:Animals; D003201:Computers; D004285:Dogs; D004562:Electrocardiography; D006339:Heart Rate