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Mean values of peak-to-peak amplitude of respiratory-related oscillations of ARI and SBP during control (C), following administration of β-adrenergic blocking (BB) agents and after subsequent addition of atropine (AT + BB). After administration of β-blockers, the amplitude of LV ARI and SBP oscillations were significantly reduced, and a trend to reduction was seen for RV ARI oscillations. *P < 0.05; **P < 0.01.
