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13.4 Which Technique to Use and Why?
https://t.me/medicina_free
% with 1
improvement on
CR-SMFRS and
PR-SMFRS
Mild SMF
Placebo: 6.7%
ATX-101: 61.3%
Extreme SMF
Placebo: 13.3%
ATX-101: 89.3%
%with≥ 1
improvement on
PR-SMFRS
Mild SMF
Placebo: 33.3%
ATX-101: 67.7%
Extreme SMF
Placebo: 46.7%
ATX-101: 89.3%
% with 1
improvement on
CR-SMFRS
Mild SMF
Placebo: 20%
ATX-101: 72.2%
Extreme SMF
Placebo: 26.7%
ATX-101: 96.4%
90% Not reported Not reported
Table 13.7 (Continued) Clinical results using deoxycholic acid in the submental region
No. of
Dosage Follow-up
Study Design No. of
treatments
after final
treatment
patients
at least 28 days
12 wk 1–6 treatments
2
Placebo,
2 mg/cm
93
Mild SMF
Multicenter,
randomized,
77
Glogau et al
apart
Placebo: 16
ATX-101: 31
Extreme SMF:
Placebo: 16
double-blind,
placebo
controlled
ATX-101: 30
spaced ~2 mo
12 wk 1–4 treatments
2
50 3 mg/cm
Single-center,
single-arm,
78
Shome et al.
2019
apart
open label
Abbreviations: CR-SMFRS, Clinician-Reported Submental Fat Rating Scale; PR-SMFRS, Patient-Reported Submental Fat Rating Scale.
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Table 13.8 Submental Fat Rating Scales (SMFRS) used as outcomes in REFINE-1 and REFINE-2 trials
Grade Clinician-
reported (CR-SMFRS)
0 Absent No chin fat at all
1 Mild A slight amount of chin fat
2 Moderate A moderate amount of chin fat
3 Severe A large amount of chin fat
4 Extreme A very large amount of chin fat
Patient-reported (PR-SMFRS)
70,71
hematoma/bruising, edema, anesthesia/numbness, and erythema. In the REFINE clinical trials, more serious, but temporary, side eects seen included marginal mandibular nerve injury (4.3% of patients), dysphagia (1.9% of patients), skin ulceration (0.2% of patients), and injection-site alopecia (0.4% of pa-
70,72
tients).
In practice, marginal mandibular nerve injury can mostly be avoided by ensuring no injec­tions are within 1.0 to 1.5cm of the inferior mandib­ular border.
66
Skin ulceration can also be avoided by ensuring appropriate injection technique by avoiding superficial injections placed in the dermis. Although rare in the clinical trials, real-world experience of 39 men receiving deoxycholic acid had 9 men (23.1%) with injection-site alopecia lasting 6 weeks to 12 months, showing that this side eect may be more common than previously reported.
74
O-label, deoxycholic acid can be used to target the jowls in certain populations with good results. A recent single-site prospective study treated 66 adults with excess jowl fat with deoxycholic acid at a dose of 2 mg/cm
2
with a mean 1.8 treatments spaced, on average, 8.6 weeks apart. Improvement in jowls was noted in 65 (98%) of patients. Com­mon side eects included edema, numbness, pain, and bruising. As it is rare to have increased jowl fat without associated submental fullness, the use of deoxycholic acid in jowls is intended to be done in conjunction with treatment of submental fat. All patients within the study had the submental area treated with deoxycholic acid injections prior to or at the same time as the jowl area.
79
Cryolipolysis
Cryolipolysis (CoolSculpting, Zeltiq Aesthetics/ Allergan, Pleasanton, CA) is a noninvasive
temperature-based treatment targeted at per­manent localized fat reduc t ion. CoolSculpting secured FDA approval for cryolipolysis for the submental area in 2015. Patients with a history of cold agglutinin disease, cr yoglobulinemia, or paroxysmal cold hemoglobinuria should not be considered for cryolipolysis.
Clinical results are summarized in Table 13.9. Submental cryolipolysis treatment parameters in studies vary and involve one or two separate treatments, but outside of clinical trials, three treatments spaced 6 to 10 weeks apart may be necessary, with full results not appearing until after 4 months.
68
Unlike with ATX-101, there is no consensus of outcome measures and therefore a variety of tools have been us ed including cali­pers, 3D imaging, radiographic imaging including magnetic resonance imaging (MRI) or ult rasound, and physician’s and patient’s subjective evaluations. Mean fat layer reduction by caliper or radiographic imaging ranges from 1.78 to 4mm. Calculation of to­tal fat volume reduction has been attempted; how­ever, the two studies using 3D imaging to calculate this significantly diered in outcomes, likely secon­dary to the absence of a standardized area of which
80,81
to calculate the volumes from.
Even without standardization of outcome s, the vast majority of pa­tients were ultimately satisfied with the treatment and reported at least some improvement.
Side eects of cryolipolysis are generally mild
and include localized erythema, bruising, edema,
80,85
numbness, paresthesia, and mild pain.
Neuro­pathic pain extending outside treatment area and lasting up to 1 week has also been reported.
86
Comparison of deoxycholic acid and cryolipoly-
sis as treatment for submental fat is presented in
Table 13.10. Additionally, cryolipolysis can be
combined with deoxycholic acid, with cryolipoly­sis used first used to reduce the bulk of adipose tis­sue and deoxycholic acid injections subsequently used to target the remaining areas and sculpt the submental area as needed.
87
Laser and Energy-Based Devices
Laser lipolysis uses laser energy to liq uefy adipocytes with the added benefit of stimulating collagen. Lasers showing ecacy in the submental region in­clude but are not limited to 980-nm diode, 1,470­nm diode, and 1,440-nm Nd:YAG lasers. 1,060-nm diode laser (SculpSure; Cynosure, West­ford, MA) was FDA approved for lower face and neck
88,89,90,91
A
158
Patient-reported
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results
13.4 Which Technique to Use and Why?
(Continued)
Pleased with results:
76%
Not reported
Reported at least
some improve-
ment: 100%
Satisfaction rate: 93%
results
Follow-up Objective
No. of
treatments
parameters
Device Treatment
mean volume
One treatment 12 wk 3D imaging:
45-min treatment
with a maximum
CoolSculpting
reduction:
cooling
System, Allergan
3
fat layer reduc-
tion of 2.3 mm
3D imaging:
mean reduc-
tion in fat
22.30 cm
mean reduc-
tion in meas-
ured region:
31.1%
fat layer reduc-
tion of 4 mm
Ultrasound:
mean fat layer
reduction of
2.8 mm
thickness of
3.77 mm
Mean volume
reduction:
3
4.82 cm
12 wk Caliper: mean
temperature of
USA Ltd, Dublin,
–11 °C, one cycle
Ireland
One treatment 3 mo Ultrasound:
45-min
treatment,
temperature not
CoolSculpting
System, Allergan
One treatment 8 wk Caliper: mean
stated, two cycles
45-min duration
at a cooling
temperature of
11 °C, two
cycles
CoolSculpting
System, Zeltiq
Aesthetics
Two treatments
spaced 6 wk
–11 °C, 45-min
cooling cycles, 2
CoolSculpting
apart
cycles except for
system; ZELTIQ
2 patients
receiving 1 cycle
Aesthetics
for second
treatment
35 CoolMini applicator,
patients
Retrospective,
nonrandomized, and
open label,
81
Table 13.9 Clinical results of submental cryolipolysis
Study Design No. of
Jain et al
20 CoolMini applicator,
interventional cohort
study
Prospective, single-
center, nonrandomized,
and open label
82
de Gusmão
et al
10 CoolMini applicator,
interventional cohort
study
Prospective, single-
center, nonrandomized,
and open label
interventional cohort
study
83
Suh et al
14 CoolMini applicator,
Prospective, single-
center, nonrandomized,
and open label
80
Bernstein
and Bloom
interventional cohort
study
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Patient-reported
Follow-up Objective
No. of
Satisfaction rate: 80%
results
results
12 wk Caliper: mean
Two treat-
treatments
First treatment:
parameters
fat layer
reduction:
ments spaced
10 wk apart
12 °C, 45-min
cooling cycle,
3.2 mm
one cycle
MRI: mean fat
Second treat-
layer reduction
ment: 15 °C,
of 1.78 mm
30-min cooling
cycle, one cycle
Satisfaction rate: 83%
mean fat layer
reduction of
2mm
12 wk Ultrasound:
Two
treatments
spaced 6 wk
apart (one
10 °C, duration
60 min, one
cycle
patient had
one treatment
only)
volume applicator,
CoolSculpting
System, ZELTIQ
Aesthetics,
center, nonrandomized,
and open label
interventional cohort
study
et al
Table 13.9 (Continued) Clinical results of submental cryolipolysis
Device Treatment
patients
Study Design No. of
15 Prototype small-
Prospective, single-
84
Leal Silva
160
Pleasanton, CA
applicator,
60 CoolMini
Multicenter,
prospective, open label,
85
Kilmer et al
CoolSculpting
nonrandomized
system, ZELTIQ
interventional cohort
Aesthetics
study
Abbreviations: MRI, magnetic resonance imaging; 3D, three-dimensional.
13.5 Conclusions
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Table 13.10 Comparison of deoxycholic acid (ATX-101) and cryolipolysis
Deoxycholic acid (ATX-101) Cryolipolysis
Mechanism of action Bile acid-induced adipocyte membrane
destruction
Invasiveness Minimally invasive Noninvasive
Indications Moderate to severe submental fat Submental fat in patients with a BMI
Number of treatments Up to 6 treatments with significant
improvements noted at 2–4 treatments
Procedure length 30 min 45 min
Adverse effects Swelling, bruising, discomfort, necrosis,
dysphagia, temporary nerve damage, and alopecia
Efficacy 61.3–89.3% of patients 1 improvement
on CR-SMFRS and PR-SMFRS
Advantages Minimal downtime and controlled
placement
Disadvantages Multiple treatments necessary, cost of
drug, and inability to accurately control fat reduction
68
Cold-induced adipocyte apoptosis
of 46.2
1–3 treatments with average of 2 treatments
Swelling, altered sensation, temporary nerve damage hyperpigmentation, and neuropathic pain
Mean submental fat thickness decrease of 1.78–4mm
Minimal downtime and controlled placement
Multiple treatments may be necessary, dedicated room for treatment required, and inability to accurately control fat reduction
Durability of results Sustained long term (at least 4 y) Permanent
Absolute contraindications Patients with active submental infection Patients with history of cold agglutinin
Abbreviations: BMI, body mass index ; CR-SMFRS, Clinician-Reported Submental Fat Rating Scale; PR-SMFRS, Patient­Reported Submental Fat Rating Scale.
contouring in 2017. In the supporting prospective, multicenter non-placebo-controlled study, 57 sub­jects were treated with up to two 25-minute treat­ments with SculpSure. Twelve weeks postfinal treatment, submental fat was reduced by 1.785mm
a reduction of 5.8mm in submental fat thickness as seen by ultrasound 6 months posttreatment. eects were mild and self-resolving and included erythema, edema, and vesicles without scarring or hyperpigmentation.
disease, cryoglobulinemia, or paroxysmal cold hemoglobinuria
93
93
and 100% of the patients were satisfied with the treatment. Side eects were mild to moderate and transient in all but one case; these included swel­ling, pain, erythema, numbness, hair loss, bruising, firmness, and blisters.
92
Radiofrequency is more recently being utilized to target submental fat. A high-powered monopo­lar radiofrequency device (truSculpt, Cutera Inc., Brisbane, CA) was shown in an exploratory study to eectively target the submental area with a cycle of 2 minutes at 43°C and 3 minutes at 45°C. Two treat­ments spaced 1 month apart on 21 patients yielded
13.5 Conclusions
Numerous noninvasive treatments are available for neck rejuvenation, allowing for significant im­provement to be achieved with less recovery time and decreased risk of adverse eects compared to surgical approaches. Table 13.11 summarizes our approach, which starts by targeting individual patients concerns and selecting treatments to en­sure the best patient outcomes. Most often, a com­bination of treatments is needed in order to
Side
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Table 13.11 Summary of noninvasive neck rejuvenation techniques based on primary concern
Dyschromia Horizontal necklines Platysmal
banding
Cosmeceuticals
Chemical peels: TCA, Jessner, glycolic acid
IPL
Nonablative fractional laser: 1,550 ± 1,927 nm
Neuromodulators
Hyaluronic acid filler
Diluted calcium hydroxylapatite
Nonablative fractional laser: 1,550, 1,440 nm
Ablative fractional laser: 10,600 nm
MFU-V
MRF
Neuro­modu­lators
Skin laxity Submental
fullness
Hyperdiluted calcium hydroxylapatite
Poly-L-lactic acid
MFU-V
MRF
Radiofrequency microneedling
Chemical peels: TCA,
Deoxycholic acid
Cryolipolysis
MRF
Laser lipolysis: 1,060 nm diode
Jessner, glycolic acid
Dermarolling and microneedling
Platelet-rich plasma
Abbreviations: IPL, intense pulsed light; MFU-V, microfocused ultrasound with visualization; MRF, monopolar capacitive­coupled radiofrequency; TCA, trichloroacetic acid.
achieve desired and lasting results. Further studies are needed to help identify which specific combi­nation treatments work best when used together.
13.6 Expert Commentary by Dr. Slavin
This is a comprehensive chapter focusing on dys­chromia, skin quality, subcutaneous fat, and contour irregularities of the head and neck. It is written by pioneers in developing and applying laser technol­ogy for cosmetic improvement of the face. In their meticulous analysis of facial features—from pigmen- tary issues to loose skinthey give a systematic, well-organized approach. These techniques are be­coming increasingly important for clinicians going forward. Although the techniques do not replace surgery, they provide excellent alternatives, particu­larly in patients who are not surgical candidates.
13.7 Expert Commentary by Dr. Lin
The authors bring forth their vast experience of noninvasive approaches of the skin and underlying structures. They outline the most commonly ad­dressed areas noninvasively, with structures at the platysmal layer and above, while comprehensively outlining the treatments available. Using these as adjunct procedures with procedures addressing the deeper structures provides an all-encompassing approach to the neck.
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