is now entirely digital, and many models incorporate embedded software for analysis and interpretation of ECG recordings with 3 or more leads. Consumer products, such as home ECG recorders for simple, 1-channel heart arrhythmia detection, also use basic ECG analysis, essentially to detect abnormalities. Some application areas are: Incorporation into automatic defibrillators, so that autonomous decision can be reached whether there is a cause for administering the electrical shock on basis of an atrial or ventricular arrhythmia; Portable ECG used in telemedicine. These machines are used to send ECG recordings via a telecommunications link, such as telephone, cellular data communication or Internet Conventional ECG machines to be used in primary healthcare settings where a trained cardiologist is not available Implications and limitations The automated ECG interpretation is a useful tool when access to a specialist is not possible. Although considerable effort has been made to improve automated ECG algorithms, the sensitivity of the automated ECG interpretation is of limited value in the case of STEMI equivalent as for example with "hyperacute T waves", de Winter ST-T complex, Wellens phenomenon, Left ventricular hypertrophy, left bundle branch block or in presence of a pacemaker. Automated monitoring of ST-segment during patient transport is increasingly used and improves STEMI detection sensitivity, as ST elevation is a dynamical phenomenon. See also Medical monitor Holter monitor Open ECG project SCP-ECG References Sources Sabbatini, RME: O computador no processamento de sinais biológicos. Revista Informédica, 2 (12): 5–9, 1995. Computers in the processing of biological signals. (In Portuguese) Translated and reproduced by permission of the author. External links ecgAUTO in-depth ECG analysis software for preclinical research Kligfield, P. Automated Analysis of ECG Rhythm Physionet Telemedical ECG Interpretation training module Health informatics Signal processing Medical equipment