Comparison of methods for adaptive sampling of cardiac electrograms and electrocardiograms

Digital sampling of cardiac electrograms and electrocardiograms is usually performed by sampling at uniform intervals with rates high enough to record the fastest signal components. Numerous redundant samples are recorded during slower deflections and baseline intervals, particularly for direct cardiac measurements that include fast Purkinje deflections. In this report, five adaptive sampling methods (voltage triggered, two-point projection, second differences, the fan and CORTES) are compared with uniform sampling for cardiac waveforms. For the electrogram, the results indicated that adaptive sampling based on the fan method might be used effectively to limit average data rates to moderate values during original data acquisition