Field of Effects of Two Commercial Preparations of Botulinum Toxin Type A

Field Effects of Two Commercial Preparations of Botulinum Toxin Type a Administered to the Frontalis Muscles

The objective of this study is to compare the field of effects of the botulinum toxins (Dysport® and Botox®) using two equivalence-ratios and to gather supportive information, such as more detailed data on the effectiveness in reduction of wrinkles and duration of action on the upper part of the face of both products, trough scales and photographs evaluations.

Study Overview

• Status: Completed
• Conditions: Wrinkles in Frontal Area
• Intervention / Treatment: Drug: Botulinum Toxin Type A (Dysport®); Drug: Botulinum Toxin Type A/Botox®; Drug: Botulinum Toxin Type A/Dysport®

Detailed Description

This was a monocentric, prospective, randomized and double-blind study. Twenty nine female patients, presenting with moderate to severe forehead wrinkles, with sweating ability who had never undergone previous BoNT-A injections were enrolled. Subjects have received botulinum toxin type-A injections in two forehead sites, Botox 2U and Dysport 5U, both reconstituted in the same volume of 0.02 mL per point. Baseline, twenty-eight and 112 days later, clinical and photographic assessments, Minor´s test, and electromyographic (EMG) evaluations were performed.

• Study Type: Interventional
• Enrollment (Actual): 29
• Phase: Phase 4

Contacts and Locations

Study Locations

• Brazil
  • Rio Grande do Sul
    • Porto Alegre, Rio Grande do Sul, Brazil, 90570 040
      • Brazilian Center For Studies in Dermatology

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 16 years to 58 years (Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: Female

Description

Inclusion Criteria:

1. Written Informed Consent (Annex 1)
2. Female
3. Subjects agreeing to take part in all procedures of the study, including botulinum toxin applications, Minor's test, measurement of Evoked Potentials, photographs, etc.), after being fully informed on the objectives and nature of the investigations
4. Subjects aged between 18 and 60 years
5. Subjects presenting with moderate to severe wrinkles on the forehead under maximum voluntary contraction of the m. frontalis

6. Subjects with positive Minor's test showing sweating on the forehead in standardized conditions described in Annex 2

   *The Minor's Test will be the last inclusion criterion to be evaluated. Only these patients eligible according to the other inclusion criteria will undergo the Minor's Test to evaluate their sweating on the forehead. The cut off point is a positive Minor's Test (Level +1) - only subjects with Minor's Test (Level +1) will be recruited in the study (Annex 2).

7. Medical history and physical examination which, based on the investigator's opinion, do not prevent the patient from taking part in the study and use the products under investigation
8. Subjects of childbearing age should present a negative urine pregnancy test at baseline and should be using an effective contraceptive method;
9. Availability of the patient throughout the duration of the study (112 days)
10. Subject agrees not to undergo other cosmetic or dermatological procedures during the study
11. Subjects with sufficient schooling and awareness to enable them to cooperate to the degree required by this protocol

Exclusion Criteria:

1. Pregnant women or women intending to become pregnant in the next 4 months after screening for eligibility
2. Subjects who are lactating
3. Subjects having undergone botulinum toxin treatment within the last 6 months
4. Subjects participating in other clinical trials
5. Any prior surgery affecting the frontalis and/or orbicularis muscles, prior blepharoplasty or brow lift
6. Any prior cosmetic procedures, including fillers, or scars that may interfere with the study results
7. Subjects presenting fronto-parietal alopecia according to the Norwood-Hamilton classification
8. Subjects with neoplastic, muscular or neurological diseases
9. Subjects using aminoglycoside and penicillamine antibiotics, quinine and Ca2+ channel blockers
10. Subjects with inflammation or active infection in the area to be injected
11. Subjects presenting evident facial asymmetry
12. Subjects with a history of adverse effects, such as sensitivity to the components of the formula, ptosis or any other adverse effect, which in the investigator's opinion should prevent the patient from participating in the study
13. Subjects presenting myasthenia gravis, Eaton-Lambert Syndrome and motor neuron diseases
14. Subjects with coagulation disorders or using anticoagulants
15. Subjects with known systemic autoimmune diseases
16. Subjects with a history of medical treatment non-adherence or showing unwillingness to adhere to the study protocol
17. Any condition that, in the opinion of the investigator, can compromise the evaluation of the study

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Double

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Botulinum toxin type - A; Dysport® compared to Botox®

Drug: Botulinum Toxin Type A (Dysport®); Botulinum toxin A (Dysport®)will be administered according to an equivalence ratio of 2,5:1. Both reconstituted in the same volume per point, injected in the forehead determined site. -Dysport®: 5 units will be injected in the left or right forehead side.; Drug: Botulinum Toxin Type A/Botox®; 2 units will be injected in the left or right forehead side.(opposite side of dysport injection); Drug: Botulinum Toxin Type A/Dysport®; Botulinum toxin A (Dysport®)will be administered according to an equivalence ratio of 2:1. Both reconstituted in the same volume per point, injected in the forehead determined site. -Dysport®: 4 units will be injected in the left or right forehead side, 2:1 ratio Dysport/Botox.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Horizontal Action Halo Diameter at 28 Days	The colorful complex formed by Minor's test allows the visualization of the area covered by the effects of botulinum toxin on sweat glands, also known as action halos. The horizontal diameter at day 28 were expressed in centimeters and quantified by the software Mirror® (Canfield Scientific Inc., USA).	28 Days
Horizontal Action Halo Diameter at 112 Days	The colorful complex formed by Minor's test allows the visualization of the area covered by the effects of botulinum toxin on sweat glands, also known as action halos. The horizontal diameter at day 112 were expressed in centimeters and quantified by the software Mirror® (Canfield Scientific Inc., USA).	112 days

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
ECMAP in m. Frontialis	The measurement of the ECMAP(Evoked Compound Muscle Action Potentials) used surface electrodes on the forehead and electrical stimulation of the facial nerve, according to standard neurophysiological procedures. The amplitude of the ECMAP in the m. frontalis on stimulation of the facial nerve was performed by an experienced neurologist. ECMAP was assessed by an electromyography (EMG) device (TECA Sapphire - TECA Corp., Pleasantville, NY).	28 days
ECMAP in m. Frontialis	The measurement of the ECMAP(Evoked Compound Muscle Action Potentials) used surface electrodes on the forehead and electrical stimulation of the facial nerve, according to standard neurophysiological procedures. The amplitude of the ECMAP in the m. frontalis on stimulation of the facial nerve was performed by an experienced neurologist. ECMAP was assessed by an electromyography (EMG) device (TECA Sapphire - TECA Corp., Pleasantville, NY).	112 days

Collaborators and Investigators

• Sponsor: Brazilan Center for Studies in Dermatology
• Investigators: Principal Investigator: Doris M Hexsel, MD

Study record dates

Study Major Dates

• Study Start: May 1, 2005
• Primary Completion (Actual): November 1, 2007
• Study Completion (Actual): December 1, 2007

Study Registration Dates

• First Submitted: October 5, 2009
• First Submitted That Met QC Criteria: October 5, 2009
• First Posted (Estimate): October 6, 2009

Study Record Updates

• Last Update Posted (Estimate): June 2, 2010
• Last Update Submitted That Met QC Criteria: May 24, 2010
• Last Verified: October 1, 2009

More Information

Terms related to this study

• Keywords: Botulinum toxin type A; field effects; dose-equivalence; anhydrotic action halos
• Additional Relevant MeSH Terms: Physiological Effects of Drugs; Neurotransmitter Agents; Molecular Mechanisms of Pharmacological Action; Peripheral Nervous System Agents; Cholinergic Agents; Membrane Transport Modulators; Acetylcholine Release Inhibitors; Neuromuscular Agents; Botulinum Toxins; Botulinum Toxins, Type A; abobotulinumtoxinA
• Other Study ID Numbers: 01-CBED06b