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Figure 4 Relationship between individual serum K⁺ measurement and corrected QT interval (QTc). Scatter plot demonstrating a negative correlation between the QTc interval and serum K⁺ level from eight study patients (total of 81 determinations). Individual symbols represent a single study patient (Fig. 2). (r = –0.52, p < 0.0001 by linear mixed model analysis). The ECGs and serum electrolytes were obtained on the same day.