In a series of 12 patients, the right atrial effective and functional refractory periods (ERP and FRP) were determined at 3 different sites and at 3 different intensities (threshold intensity and double and triple the threshold intensity). The mean of the range of the ERP in the same atrium was 43.4 ms and that of the FRP was 53.5 ms. These ranges appear to be independent of the intensity of stimulation. However, the values of the refractory periods were strictly correlated with the intensity of the stimulation current used. This correlation appeared to be much more marked for the ERP than for the FRP.
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