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Dr. Lily Talakoub
Dr. Lily Talakoub
The neck and the lower face are covered by thin layers of a vertical muscle, the anterior and posterior platysma muscle that is innervated by the cervical branch of the facial nerve. This muscle superficially blends with the muscles of the lower face, including the depressor anguli oris, depressor labii inferioris, mentalis, risorius, and orbicularis oris muscles. The inferior portion blends with the pectoralis and anterior deltoid muscles and lifts the skin of the neck.
Dr. Lily Talakoub
Before and after treatment of the platysmal bands with botulinum toxin
Treatment of the platysma muscle and bands with botulinum toxin is an effective treatment for aging and sagging of the lower face and neck. Although treatment techniques differ and there are currently no standardized guidelines, the treatment starts by having the patient contract the neck muscles (I have them sit upright, with their head completely straight and say “E” with force). After evaluating the tension of the muscle, the muscle should be grasped and pulled away from the neck. Botulinum toxin is injected perpendicular to the muscle, with a dose of approximately 2 units, 2 cm apart along the vertical muscle. Approximately 20-40 units are used for the anterior and lateral bands.
To balance the opposing forces of the depressors of the lower face and improve jowling and downturning of the mouth, 10-20 units are also injected subdermally 1 cm above and 1 cm below the mandibular border.
Understanding the anatomy of the face and neck is crucial to proper injection. Side effects from improper injection include dysphagia, dysphonia, asymmetric smile, and weakness of the neck muscles. It is also important to set realistic expectations and address other components of neck aging, including actinic damage, as well as submental and jowl fat. The manufacturer of onabotulinumtoxinA (Botox Cosmetic) recently announced positive results of a second phase 3 clinical trial evaluating onabotulinumtoxinA for the treatment of moderate to severe platysma prominence. Results of the multicenter, randomized, double blind, placebo-controlled study evaluated the safety and efficacy of one treatment versus placebo in 426 adults with moderate to severe platysmal prominence. The results showed statistically significant improvement of platysma prominence from baseline, based on investigator and patient assessments, with no new safety signals, according to the company. The company expects to submit phase 3 data to the Food and Drug Administration by the end of this year and if approved, it will be the first neurotoxin approved for the treatment of platysmal bands.
Dr. Talakoub is in private practice in McLean, Va. Write to her at dermnews@mdedge.com. She had no relevant disclosures.
References
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