sodium-bicarbonate and Eye-Pain

Determine if raising the pH of 2% lidocaine with epinephrine 1:100 000 to a physiologic level decreases pain perception during periocular, subcutaneous anesthesia.. Double-blind, prospective, randomized study. Simultaneous unilateral injections of buffered and unbuffered lidocaine solutions were given before surgery to patients having bilateral, periocular surgery.. Fifty-four consecutive patients (27 male and 27 female; mean age, 68 years; standard deviation, 11 years).. Patients were given simultaneous injections of buffered and unbuffered 2% lidocaine with epinephrine 1:100 000. The needles were inserted simultaneously and the anesthesia was injected for a 20-second count for a total volume of 1.0 ml per injected side.. After the simultaneous injections, the patients were asked to rate the pain on each side on a Likert-type visual analog scale of 0 to 10.. Sixty-five percent of patients preferred the buffered lidocaine with a scaled pain reduction of 0.9 (P = 0.0005). Additionally, for the patients who believed that the buffered solution was less painful, the mean decrease in scaled pain rating was 2, for a 51% reduction in pain level (P = 0.001). No gender differences were noted.. Buffering 2% lidocaine with epinephrine 1:100 000 with sodium bicarbonate 8.4% offers a clinically and statistically significant reduction in pain experienced by two-thirds of patients receiving periocular subcutaneous anesthesia.

Topics: Adult; Aged; Aged, 80 and over; Anesthesia, Local; Anesthetics, Local; Blepharoplasty; Buffers; Double-Blind Method; Epinephrine; Eye Pain; Female; Humans; Hydrogen-Ion Concentration; Injections, Intraocular; Lidocaine; Male; Middle Aged; Orbit; Pain Measurement; Prospective Studies; Rhytidoplasty; Sodium Bicarbonate