Progress in Holter Monitoring Towards an Implantable System
During the last decade, Holter recording has demonstrated good results in the diagnosis of paroxystic arrhythmias, improved knowledge of their induction mechanisms, and evaluation of therapeutic efficiency. Use of micro computers has allowed quantitative or semi quantitative evaluation of arrhythmias. Permanent recording of the endocardial signal leads to the determination of a rhythmic profile of implanted patients. New technical problems are seen. Unlike the external Holter, these difficulties are not related to the detection of electrocardiographic signals but are due to limited memory capacity. This constraint leads to statistical treatment of compressed or synthetic data, with edition of sequential classification of arrhythmias, frequency histograms, or numbered data. These possibilities make it as interesting as the external Holter.