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Fig. 3 | Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine

Fig. 3

From: Intra-patient potassium variability after hypothermic cardiac arrest: a multicentre, prospective study

Fig. 3

Bland-Altman analysis of the difference in potassium between the two analytic methods for each of the three sampling sites. For each comparison the mean value of potassium for each of the two analytic methods (blood gas analyser or central labolatory) is plotted against their difference. Red dash lines represent the ±0.5 mmol/L upper and lower limits of standard criteria for acceptable performance for potassium. The mean difference in potassium obtained from the central vein between the blood gas analyser and central labolatory was 0.81 (p = 0.0208). The mean difference in potassium obtained from the peripheral vein between the blood gas analyser and central labolatory was 0.51 (p = 0.1491). The mean difference in potassium obtained from the artery between the blood gas analyser and central labolatory was 0.17 (p = 0.5042). BGA = blood gas analyser; CL = central laboratory (CL); K + =potassium

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