Fig. 3. Effect of 10 μm S  (−)- and R  (+)-bupivacaine and of 10, 20, 30, 40, and 50 μm S  (−)- and R  (+)-ropivacaine on second-degree atrioventricular dissociation of the Wenckebach (type I) and Mobitz (type II) classification on different numbers of hearts displayed in the graphs. All hearts with 1:1 atrioventricular conduction showed first-degree atrioventricular dissociation at 10 μm and higher. Significance of atrioventricular dissociation is given in the text. Third-degree atrioventricular dissociation and other dysrhythmias, with the exception of atrioventricular dissociation, were not observed. During drug-free washout periods, atrioventricular dissociation reverted to sinus rhythm. BUP = bupivacaine; ROP = ropivacaine.

Fig. 3. Effect of 10 μm S  (−)- and R  (+)-bupivacaine and of 10, 20, 30, 40, and 50 μm S  (−)- and R  (+)-ropivacaine on second-degree atrioventricular dissociation of the Wenckebach (type I) and Mobitz (type II) classification on different numbers of hearts displayed in the graphs. All hearts with 1:1 atrioventricular conduction showed first-degree atrioventricular dissociation at 10 μm and higher. Significance of atrioventricular dissociation is given in the text. Third-degree atrioventricular dissociation and other dysrhythmias, with the exception of atrioventricular dissociation, were not observed. During drug-free washout periods, atrioventricular dissociation reverted to sinus rhythm. BUP = bupivacaine; ROP = ropivacaine.

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