Table 2.

Safety Measure: Rescuer's Holter ECG Data

	Hands On	Hands Off	P
Premature atrial contractions (PACs) per hour	3.3 [0.2; 9.3] 5.0±5.4	3.3 [0.7; 5.3] 3.1±2.4	0.8253
Premature ventricular contractions (PVCs) per hour	0.0 [0.0; 0.0] 0.2±0.5	0.0 [0.0; 1.5] 0.6±1.3	0.7270
Heart rate, range	46 to 132	41 to 95

The coinvestigators performing chest compressions were connected to a Holter ECG. The records did not reveal any serious cardiac arrhythmias. Neither bigeminy nor salvos were detected. Data are expressed as median [25%; 75% quartile] and mean±SD and for heart rate as the range from lowest to highest observed heart rate.