. Author manuscript; available in PMC: 2021 May 26.

Published in final edited form as: J Cardiothorac Vasc Anesth. 2019 Nov 2;34(5):1152–1159. doi: 10.1053/j.jvca.2019.10.045

Table 3. Comparisons of Electrolyte Concentrations for Those Who Did and Did Not Develop AF.

AF Group		No AF Group		p value
Derivative	Mean (SD) Concentration mmol/L	Mean (SD) Concentration mmol/L	Derivative	p value
Preoperative [K⁺]	4.29 (0.41)	4.32 (0.40)	Preoperative [K⁺]	0.13
Mean [K⁺] in the 12 h before onset of AF	4.50 (0.35)	4.58 (0.26)	Mean [K⁺] in first 72 hours	<0.001
		3.96 (0.36)	Minimum [K⁺] in first 72 hours	<0.001^*
Δ[K⁺]	0.21 (0.48)	0.26 (0.41)	Δ[K⁺]	0.05
Mean [Mg²⁺] in the 24 h before onset of AF	1.09 (0.26)	1.05 (0.21)	Mean [Mg²⁺] in first 72 hours	<0.001
		0.95 (0.18)	Minimum [Mg²⁺] in first 72 hours	<0.001^{^}

For those who developed AF, Δ [K⁺] = mean [K⁺] in the 12 hours before onset of AF — preoperative [K⁺]. For those who did not develop AF, Δ [K⁺] = mean [K⁺] in the 72 hours after surgery — preoperative [K⁺].

Abbreviations: AF, atrial fibrillation.

Compared with Mean [K⁺] in the 12 h before onset of AF.

^{^}

Compared with Mean [Mg²⁺] in the 24 h before onset of AF.