Comparative clinical trial of topical anesthetic agents in cataract surgery: lidocaine 2% gel, bupivacaine 0.5% drops, and benoxinate 0.4% drops.
OBJECTIVE
To assess the efficacy of lidocaine gel, bupivacaine drops, and benoxinate drops as topical anesthetic agents in cataract surgery.


METHODS
Kasr El-Aini Hospital, Cairo University, Cairo, Egypt.


METHODS
This prospective randomized study comprised 90 patients scheduled for routine cataract extraction. Patients were randomized into 3 groups of 30 each based on which anesthetic agent they received: lidocaine 2% gel, bupivacaine 0.5% drops, or benoxinate 0.4% drops. Subjective pain at application of the agent and intraoperatively was quantified by the patients using a verbal pain score (VPS) scale from 0 to 10. The duration of discomfort at application, duration of surgery, rate of supplemental sub-Tenon's anesthesia, and complications were recorded.


RESULTS
The mean VPS at application was 2.97, 1.53, and 1.03 in the lidocaine, bupivacaine, and benoxinate groups, respectively; the VPS in the lidocaine group was statistically significantly higher than in the other 2 groups (P<.001). The mean duration of pain at application was 25 seconds, 14 seconds, and 6 seconds in the lidocaine, bupivacaine, and benoxinate groups, respectively, and was statistically significantly higher in the lidocaine group (P<.001). The mean VPS during surgery was 1.6, 4.1, and 7.1 in the lidocaine, bupivacaine, and benoxinate groups; the lidocaine group had a statistically significantly lower mean VPS than the other 2 groups (P<.001). The incidence of supplemental sub-Tenon's injection was 3.3%, 10.0%, and 73.3%, respectively, and was statistically significantly lower in the lidocaine and bupivacaine groups than in the benoxinate group (P<.001). The patients' overall satisfaction was statistically significantly higher in the lidocaine and bupivacaine groups than in the benoxinate group (93.3%, 83.3%, and 33.3%, respectively) (P<.001). Three patients in the lidocaine group had corneal haze at the time of surgery, which was not statistically significant (P>.1).


CONCLUSIONS
Lidocaine gel was a better topical anesthetic agent than bupivacaine and benoxinate drops. Bupivacaine drops were effective in providing deep topical anesthesia.
Department of Ophthalmology, Kasr El Aini Hospital, Cairo University, El-Manial, 16 Sherif Street, Cairo 11111, Egypt. mmsolim@ie-eg.com
Mahmoud M
MM
Soliman
Tamer A
TA
Macky
M Khaled
MK
Samir
D000368:Aged; D000772:Anesthesia, Local / Q000379:methods*; D000779:Anesthetics, Local / Q000008:administration & dosage*; D002045:Bupivacaine / Q000008:administration & dosage*; D019923:Capsulorhexis; D005260:Female; D005782:Gels; D006801:Humans; D008012:Lidocaine / Q000008:administration & dosage*; D008297:Male; D008875:Middle Aged; D009883:Ophthalmic Solutions / Q000008:administration & dosage; D010147:Pain Measurement; D010149:Postoperative Pain / Q000175:diagnosis; D017060:Patient Satisfaction; D018918:Phacoemulsification; D011343:Procaine / Q000008:administration & dosage* / Q000031:analogs & derivatives*; D011446:Prospective Studies
D000779:Anesthetics, Local; D005782:Gels; D009883:Ophthalmic Solutions; D011343:Procaine; D008012:Lidocaine; C005298:benoxinate; D002045:Bupivacaine