Characterization of Transient Alterations of Cutaneous Sensory Nerve Function by Cryolipolysis

Not Applicable

Completed

Conditions: Adiposity

Interventions: Device: Zeltiq CoolSculpting device

Registration Number: NCT01673113

Lead Sponsor: Massachusetts General Hospital

Brief Summary: Cryolipolysis with Zeltiq CoolSculpting device is a novel method of non-invasive fat removal. The technique works by application of cold plates to the skin surface for a single cooling cycle lasting 60 minutes, after which a cold-induced inflammatory panniculitis leads to selective loss of fat. There is no histologic evidence of necrotic or inflammatory damage to skin or nerves, however a single small human study has reported prolonged temporary altered sensation (hypoesthesia) in the area of cryolipolysis procedure. This hypoesthesia seen in about 2/3 of patients, is completely reversible, lasts up to 8 weeks after treatment, and suggests that cooling under these conditions can temporarily alter sensory nerve function.

The purpose of this study is to further characterize the reversible cutaneous sensory function alteration after cryolipolysis with Zeltiq CoolSculpting device. Using multiple modalities of sensory nerve function we hope to elucidate the details of cryolipolysis induced sensory nerve alteration.

Detailed Description: Study design We undertook an open-label, prospective study at the Massachusetts General Hospital (MGH) (Boston, USA) between December 2012 and July 2013. The study was approved by the MGH Institutional Research Board and was registered at ClinicalTrials.gov (NCT01673113). Written, informed consent was obtained from all participants prior to participation in the study. The study conformed to the standards set by the Declaration of Helsinki and Good Clinical Practice Guidelines.

Eleven healthy subjects were enrolled in the study. They were randomized to have either the left or right flank treated with a single cycle of cryolipolysis. Baseline measurement of sensory function was evaluated using QST at the treated and control (untreated) flank for each subject. Histamine iontophoresis was used to evaluate itch duration and intensity on the treated and control flank for each subject. All sensory function testing, including responses to histamine-induced itch, were assessed at 48-72 hours, and Day 7, 14, 21, 35 and 56 post-treatment. In 6 subjects, skin biopsies (3 mm diameter) for histological analysis of nerve fiber density at the treated flank were taken at baseline, 48-72 hours, Day 21 and 56 post-treatment.

Cryolipolysis procedure All subjects received cryolipolysis treatment to the flank above the iliac crest, on one side of the body. The untreated (contralateral) flank served as the control throughout the study. Subjects were randomized to have right or left flank treated and randomization was achieved with a computer-generated randomization code. The treatment site was identified, assessed and marked by a single, unblinded investigator. The sensory testing site within the flanks was marked and registered using a transparent plastic sheet, aligned using cutaneous landmarks including nevi or scars, and photographed with the subject in a standard position, to ensure that the same area was tested on follow-up visits.

Cryolipolysis was performed using an EzApp6.3 applicator (CoolScultping, Zeltiq Aesthetics Inc, Pleasanton USA) and standard settings at cooling intensity factor (CIF) of 41.6, corresponding to heat transfer of -73mW/cm2, applied for one hour.

Quantitative sensory testing (QST) The QST protocol consisted of a series of 7 sensory tests. The QST procedure started with the evaluation of mechanical followed by thermal thresholds.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 11

Inclusion Criteria

Subjects ages 18-65 years old, male or female with visible adiposity on the flanks (love handles) and no weight changes exceeding 10lb during the preceding month.
Willingness to participate in the study
Informed consent agreement signed by the subject
Willingness to follow the treatment schedule and post treatment care requirements
Willingness to have skin biopsy done
No history of allergy to lidocaine or any other anesthetics.

Exclusion Criteria

Subject has a history of nerve problems, neuropathy
Subject who has recently undergone liposuction or another weight loss procedure, had a history of subcutaneous injections into the area of intended treatment within the preceding 6 months.
Subjects with history of diabetes
Subjects with a BMI of 30 or greater
Subject has an infection, surgical scars or other dermatologic condition in the area to be treated
Subject has known cold sensitivity disorders including Raynaud's phenomena, cold urticaria, cryoglobulinemia, or cold induced hemoglobinuria
Women who are pregnant or intending to become pregnant in the following 9 months; women who are lactating or had been lactating in the prior 9 months.
Subject is immunosuppressed
Subject is unable to comply with treatment, home care or follow-up visits
Subject has a history of vitiligo
Subject has a history of keloid formation
Subject is currently enrolled in a clinical study of any other unapproved investigational drug or device.
Any other condition or laboratory value that would, in the professional opinion of the investigator, potentially affect the subject's response or the integrity of the data or would pose an unacceptable risk to the subject.
Subject taking anticoagulants

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Cryolipolysis	Zeltiq CoolSculpting device	All subjects were randomized to have either the left of right flank treated with single the Zeltiq CoolSculpting Device, which is an FDA approved cooling device used for non-invasive and selective reduction of fat around the flanks. Sensory testing was done before and after the procedure.

Primary Outcome Measures

Name	Time	Method
Vibration Detection Threshold (VDT)	within 48-72 hours after treatment	VDT was evaluated using a computerized vibrometer with 1cm2 contact probe placed perpendicularly on the skin (TSA-II, Medoc Inc., Ramat Yishai, Israel). This device gradually increased the vibration magnitude until the subject pressed a "stop" button to indicate when they first felt the vibration. This test was repeated 8 times. The values presented in the data table were averaged over all repeats.

Secondary Outcome Measures

Name	Time	Method
Mechanical Detection Threshold (MDT)	48-72 hours post treatment	MDT was evaluated using von Frey Filaments. The up-down method, which evaluates the threshold force for appearance and disappearance of a touch sensation reported by the subject, was used until 3 values were obtained. The values presented in the data table were averaged over all repeats.