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Studies using isolated sinoatrial node (SAN) cells indicate that rhythmic spontaneous sarcoplasmic reticulum calcium release (Ca clock) plays an important role in SAN automaticity. In the intact SAN, cross-contamination of optical signals from the SAN and the right atrium (RA) prevent the definitive testing of Ca clock hypothesis. The aim of this study was to use a novel approach to selectively mapping the intact SAN to examine the Ca clock mechanism.

Selective Sinoatrial Node Optical Mapping and the Mechanism of Sinus Rate Acceleration