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Rate-dependent properties of spontaneous calcium release (SCR). A: spontaneous Ca transient during a pause following steady-state pacing at cycle length (CL) = 500 ms. The spontaneous Ca transient is characterized by the time to peak T, and the difference between the peak and minimum Ca concentration Δcimax. B: average time to the peak of the spontaneous Ca transient (Tave) as a function of the pacing CL. C: average Δcimax as a function of CL.
