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Correlation among HRV paremeters and endothelin‐1 (ET‐1) in patients' coronary slow flow. (A) between SDNN and ET‐1, (B) between SDANN and ET‐1, (C) between SDNN index and ET‐1 (D) between RMSSD and ET‐1, (E) between pNN50 and ET‐1, (F) between triangular index and ET‐1.
