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PM inhalation increased AV block arrhythmias only in ISO-pretreated animals. Values represent group means (± standard error) over the 7 h after nose-only inhalation exposure or the time-matched 7-h period on the preceding day (“Pre-Inhalation”). Star indicates significant difference from Sal-PM (P < 0.05). Diamond represents significant difference from ISO-Air (P < 0.05). N = 5 per group.
