Beneficial cardiovascular effects of reducing exposure to particulate air pollution with a simple facemask

Table 3 Arrhythmia analysis from 24-hour Holter electrocardiograms.

	Without Mask	With Mask
Pause	0	0
Dropped beat	0	0
Ventricular tachycardia	0	0
Salvo	0	0
Triplet	0	0
Couplet	0	0
Bradycardia (=50 bpm)	71	227
Supraventricular tachycardia	0	0
Bigeminy	57	157
Trigeminy	4	7
"R on T"	0	0
Premature aberrant	3246	4698
Isolated aberrant	18	3
Premature normal	11	17
Maximum heart rate	134 (126 – 143)	128 (120 – 137)
Minimum heart rate	51 (48 – 54)	49 (46 – 53)

Data shown are total number of events recorded in each condition over all subjects.
P > 0.05 for all (Wilcoxon matched pairs test). Maximum and minimum heart rates shown as mean (95% confidence intervals), P > 0.05 for both, Student's paired t-test.

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