Mechanism of dynamic entrapment: parameter oscillation.

A shift in behavior (SR_cond to CCWR) occurs when ΔV_repol rises above a critical value and the system enters region 3 of R-ΔV_repol space (at 2,000ms & 17,000ms); CCWR does not revert back to SR_cond despite reversal of ΔV_repol back into region 2 (at 5,000ms & 20,000ms). The inverse occurs when ΔV_repol falls below another critical value and the system enters region 1 of parameter space (at 9,000ms & 24,000ms); the system returns to SR_cond and remains there even when the system returns to region 2 (at 13,000ms & 28,000ms).