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Example of local unipolar electrograms recorded from an electrode site on the right ventricular endocardium. Times of local activation are marked with circles, repolarization with squares, activation-repolarization intervals (ARIs) are labeled above each beat. ARIs are plotted in central panel for comparison with respiration trace, top, during fixed-rate breathing at 15 breaths/min. ARI shortened during inspiration, lengthened during expiration.
