Fig. 6. Time course of analgesia after injection of commercial 1% lidocaine solutions with epinephrine: lidocaine with epinephrine (1:200,000; □ CLE; pH = 4.5; n = 9); lidocaine with epinephrine (1:200,000) and 8.4% sodium bicarbonate (10:1; ▪ CLBCE; pH = 7.5; n = 9); control (⋄ n = 4).

Fig. 6. Time course of analgesia after injection of commercial 1% lidocaine solutions with epinephrine: lidocaine with epinephrine (1:200,000; □ CLE; pH = 4.5; n = 9); lidocaine with epinephrine (1:200,000) and 8.4% sodium bicarbonate (10:1; ▪ CLBCE; pH = 7.5; n = 9); control (⋄ n = 4).

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