Article

OBJECTIVE: To determine the relative acoustic transmission allowed by various
preparations at 1MHz and 3MHz ultrasound (US) frequencies. DESIGN: Bench-top
laboratory study. SETTING: Laboratory. PARTICIPANTS: No human or animal
participants were used. INTERVENTIONS: We administered continuous US through
various over-the-counter preparations at 1.2W/cm(2) at both 1MHz and 3MHz
frequencies for 30 seconds and measured the acoustic output. MAIN OUTCOME
MEASURES: Percentage of transmission of energy relative to commercial US gel.
Planned observational comparisons were made at both 1MHz and 3MHz frequencies.
Topical agents were categorized as either gel-based or cream-based preparations.
RESULTS: Transmission of gel-based preparations (1MHz and 3MHz): Arnica gel (97%
and 110%), Biofreeze (60% and 79%), Capzasin (70% and 93%), Cobroxin (76% and
91%), and Solarcaine (70% and 101%). Cream-based preparations (1MHz and 3MHz):
Arnica cream (67% and 74%), Australian Dream (54% and 80%), Bengay (37% and 55%),
MediPeds Footcare (126% and 101%), Neuragen PN (76% and 90%), Octogen (38% and
47%), and Thera-Gesic (52% and 73%). CONCLUSIONS: Topical agents suspended in
aqueous gels are generally more effective in transmitting US energy, while many
cream-based agents are less effective, particularly at 1MHz frequency. Many
agents that are commonly used to provide a sensory effect, such as topical
analgesic creams, may block US transmission. Agents that reduce US transmission
may lead to poor phonophoresis results and are likely to minimize the therapeutic
effects of US.
CI - Copyright (c) 2013 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS