Abstract | PURPOSE: To determine whether the use of topical anesthesia has an impact on botulinum toxin type A (BTX-A) efficacy. METHODS: Forty patients (20 receiving BTX-A for facial cosmetic rhytid reduction and 20 for benign essential blepharospasm) were evaluated in a double-blind, randomized, triple-crossover study at 2.5- to 4.5-month intervals. The discomfort and efficacy of BTX-A injections after betacaine application to half the face (random assignment) were compared against the discomfort and efficacy of a placebo ointment on the other half of the face. This was followed by cryoanalgesia to the entire face. RESULTS: Patients ranged from 27 to 81 years of age (mean, 53 years), and 34 were female. Of the 120 total injection comparisons, a better BTX-A effect on one side of the face was reliably identified by 80% and 77% of blepharospasm and cosmetic patients, respectively, with the placebo-treated side providing better BTX-A effect approximately 90% of the time (p < 0.001). Patients reported a more painful side during injection in just 18 of the 120 trials, and only 1 of 40 patients believed the administration of analgesia was worth the trouble. CONCLUSIONS: Pretreatment with topical betacaine followed by skin cooling seems to have a deleterious impact on BTX-A effect without a significantly beneficial patient-perceived reduction in injection discomfort.
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Authors | Mirwat S Sami, Charles N S Soparkar, James R Patrinely, Lisa M Hollier, Larry H Hollier |
Journal | Ophthalmic plastic and reconstructive surgery
(Ophthalmic Plast Reconstr Surg)
Vol. 22
Issue 6
Pg. 448-52
( 2006)
ISSN: 0740-9303 [Print] United States |
PMID | 17117100
(Publication Type: Journal Article, Randomized Controlled Trial)
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Chemical References |
- Anesthetics, Local
- Neuromuscular Agents
- Botulinum Toxins, Type A
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Topics |
- Administration, Topical
- Adult
- Aged
- Aged, 80 and over
- Anesthesia, Local
(methods)
- Anesthetics, Local
(administration & dosage)
- Blepharospasm
(drug therapy)
- Botulinum Toxins, Type A
(administration & dosage, therapeutic use)
- Cross-Over Studies
- Double-Blind Method
- Female
- Follow-Up Studies
- Humans
- Injections
- Male
- Middle Aged
- Neuromuscular Agents
(administration & dosage, therapeutic use)
- Rhytidoplasty
(methods)
- Treatment Outcome
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