Growth of V
leading to sudden fast rhythm. The first part of A and B panels was recorded in 19.2 mM [K+]o at normal and higher gain, respectively. Recovery in Tyrode solution began at the downward arrow and continued for the rest of the figure. The section of panel B between the two arrows is shown at greater time base in panel C. The dots emphasize the growth of Vos and the circles that of ThVos.