Short-term effects of fine particulate matter and ozone on the cardiac conduction system in patients undergoing cardiac catheterization

Table 4 Percent change (95% CI) of the geometric mean of ECG parameters per interquartile range increase in pollutants

ECG parameter	Lag (day)	PM_2.5	O₃
ECG parameter	Lag (day)	% Change (95% CI)	% Change (95% CI)
PR	0	-0.07 (-0.23, 0.08)	-0.01 (-0.24, 0.23)
	1	-0.07 (-0.23, 0.09)	0.03 (-0.21, 0.27)
	2	-0.07 (-0.23, 0.09)	-0.12 (-0.36, 0.12)
	3	0.17 (0.01, 0.33)^*	0.02 (-0.22, 0.26)
	4	0.18 (0.03, 0.34)^*	0.29 (0.05, 0.53)^*
	04	0.07 (-0.18, 0.32)	0.09 (-0.26, 0.43)
QRS	0	0.11 (0.00, 0.22)	-0.04 (-0.21, 0.12)
	1	0.03 (-0.08, 0.14)	0.00 (-0.17, 0.16)
	2	0.01 (-0.10, 0.12)	-0.05 (-0.22, 0.11)
	3	0.04 (-0.07, 0.15)	0.04 (-0.13, 0.21)
	4	0.11 (0.00, 0.21)	0.21 (0.04, 0.37)^*
	04	0.15 (-0.03, 0.32)	0.06 (-0.18, 0.30)
QTc	0	0.11 (0.02, 0.19)^*	0.17 (0.04, 0.30)^**
	1	0.05 (-0.04, 0.14)	0.18 (0.04, 0.31)^**
	2	0.05 (-0.04, 0.14)	0.07 (-0.06, 0.21)
	3	0.11 (0.03, 0.20)^*	0.02 (-0.11, 0.15)
	4	0.13 (0.05, 0.22)^**	0.04 (-0.09, 0.17)
	04	0.23 (0.09, 0.36)^**	0.20 (0.01, 0.39)^*
HR	0	0.22 (-0.05, 0.49)	0.23 (-0.17, 0.63)
	1	0.47 (0.20, 0.75)^**	0.40 (0.00, 0.81)
	2	0.28 (0.01, 0.56)^*	0.28 (-0.13, 0.69)
	3	-0.11 (-0.38, 0.16)	-0.21 (-0.62, 0.20)
	4	0.04 (-0.23, 0.30)	-0.12 (-0.53, 0.29)
	04	0.44 (0.01, 0.86)^*	0.24 (-0.34, 0.83)

CI confidence interval, ECG electrocardiogram, PM_2.5 particulate matter ≤ 2.5 μm in aerodynamic diameter, O₃ ozone; QTc heart rate-corrected QT interval, HR heart rate
^*p-Value <0.05; ^**p-Value <0.01

ISSN: 1743-8977