Table 2.

Summary of studies included in the meta-analysis

Study	Country of study	Definition of bradycardia	Patients analyzed in the study	Patients that had bradycardia	Patients without bradycardia	Number that died in bradycardia group	Number that died in non-bradycardia group
Chalkias et al. [16]	Greece	Heart rate ≤ 60 BPM on continuous heart rate monitoring	Consecutive patients requiring ICU admission	64	17	52	9
Kumar et al. [11]	USA	Heart rate < 60 BPM on two separate occasions, a minimum of 4 h apart, on continuous cardiac monitoring	All consecutive COVID-19 patients admitted during the study period	262	791	46	151
Antwi-Amoabeng et al. [10]	USA	Bradycardia on cardiologist-confirmed ECG report	All consecutive COVID-19 patients admitted during the study period	13	173	1	31

BPM: beats per minute, ICU: intensive care unit, ECG: electrocardiogram