“ Adenosine significantly lengthened the sinus cycle length in the baseline state (760 ± 165 vs …), during isoproterenol infusion (516 ± 67 vs 766 ± 146 ms, P < 0.05), after propranolol (850 ± 153 vs 914 ± 143 ms, P < 0.05) and after … atropine (662 ± 76 vs 801 ± 121 ms, P < 0.05).”