Table 2.

Provides an overview of the key findings from the included studies

Outcomes	Number of studies	Effect model	MD/OR	I 2 (%)	P value for heterogeneity	Effect size	P value
AF (number)	5	RE	OR	83	< 0.0001	0.71 (0.32-1.58)	0.40
Postoperative persistent AF	2	FE	OR	0	0.97	0.19 (0.10-0.36)	< 0.00001
Reoperation for bleeding	2	FE	OR	0	0.35	0.63 (0.16-2.44)	0.50
TIA/stroke after cardiac surgery	2	FE	OR	0	0.54	0.50 (0.09-2.73)	0.42
Length of hospital stay (days)	5	RE	MD	59	0.04	-0.14 (-0.54 to 0.27)	0.50
30-day mortality	2	FE	OR	0	0.69	0.58 (0.12-2.72)	0.49
Post-operative blood drainage (mL)	3	FE	MD	0	0.72	2.22 (-23.60 to 28.03)	0.87
Post-operative magnesium (mmol/L)	2	FE	MD	0	0.67	-0.07 (-0.08 to -0.06)	< 0.00001

AF: Atrial fibrillation; TIA: Transient ischemic attack; MD: Mean difference; OR: Odds ratio; RE: Random effects; FE: Fixed effects.