Table 1.
Duration | 4 wk | 8 wk | 12 wk | |||
---|---|---|---|---|---|---|
Exposure | FA () | SHS () | FA () | SHS () | FA () | SHS () |
APD (ms) | a | |||||
APDD () | a | |||||
Trise (ms) | a | |||||
CV (cm/sec) | b | |||||
CaTD (ms) | b | |||||
VT/VF incidence | 0/4 | 0/4 | 0/4 | 0/5 | 0/4 | 0/5 |
Extra beats | b |
Note: Data were analyzed with two-way analysis of variance (ANOVA) with Tukey’s posthoc test. No statistical differences were observed between groups, among exposure duration, or with group/duration interaction. APD, action potential duration; APDD, action potential duration dispersion; CaTD, transient duration; CV, conduction velocity; FA, filtered air; PCL, pacing cycle length; SHS, secondhand smoke; Trise, action potential rise time; VF, ventricular fibrillation; VT, ventricular tachycardia. VT/VF incidence is shown as the ratio of hearts per group with VT/VF. Extra beats, the maximum number of extra beats observed in each heart during a complete S1–S2 pacing protocol.
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