Comparison 1. Atrial fibrillation or Supraventricular tachycardia.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1.1 All Treatments	118	18381	Odds Ratio (M‐H, Random, 95% CI)	0.41 [0.37, 0.47]
1.1.1 Pharmacological Interventions	93	14685	Odds Ratio (M‐H, Random, 95% CI)	0.40 [0.35, 0.46]
1.1.2 Non‐pharmacological Interventions	27	3696	Odds Ratio (M‐H, Random, 95% CI)	0.44 [0.34, 0.57]
1.2 Amiodarone	33	5402	Odds Ratio (M‐H, Random, 95% CI)	0.43 [0.34, 0.54]
1.3 Beta‐Blockers	33	4698	Odds Ratio (M‐H, Random, 95% CI)	0.33 [0.26, 0.43]
1.4 Sotalol	11	1609	Odds Ratio (M‐H, Random, 95% CI)	0.34 [0.26, 0.43]
1.5 Magnesium	21	2988	Odds Ratio (M‐H, Random, 95% CI)	0.55 [0.41, 0.73]
1.6 Atrial Pacing	21	2933	Odds Ratio (M‐H, Random, 95% CI)	0.47 [0.36, 0.61]
1.7 Posterior Pericardiotomy	6	763	Odds Ratio (M‐H, Random, 95% CI)	0.35 [0.18, 0.67]