Fig. 7From: Nonlinear analysis of beat-to-beat variability of action potential time series data identifies dynamic re-entrant substrates in a hypokalaemic mouse model of acquired long QT syndromeDetrended fluctuation analysis plots expressing detrended fluctuations F(n) as a function of n in a log–log scale before (A) or after the application of experimental hypokalaemia (B) and hypokalaemia with 0.1 mM heptanol (C). Short-term (D) and long-term (E) fluctuation slopes (n = 7 hearts)Back to article page