Which practice most clearly describes the effect of combining ultrasound with certain topical agents?

Which practice most clearly describes the effect of combining ultrasound with certain topical agents?

• A. Applying ultrasound while the area is stretched
• B. Mixing petroleum-based sports creams with ultrasound gel
• C. Using a crystal with a low beam non-uniformity ratio
• D. Using a hot pack prior to ultrasound

Answer: (B)

Phonophoresis is being tapped here—using ultrasound to drive a topical medication through the skin by increasing its permeability. When a topical agent is present in a conductive medium, such as ultrasound gel, and is mixed with a petroleum-based sports cream, the ultrasound energy facilitates the agent’s penetration into deeper tissues. The mechanical effects of the ultrasound—microstreaming and cavitation—temporarily disrupt the stratum corneum and enhance diffusion, making the medication reach underlying structures more effectively than it would with topical application alone. This demonstrates how combining ultrasound with a topical agent can amplify drug delivery. Other scenarios involve different techniques or heating effects that don’t describe this enhanced transdermal delivery.

Phonophoresis is being tapped here—using ultrasound to drive a topical medication through the skin by increasing its permeability. When a topical agent is present in a conductive medium, such as ultrasound gel, and is mixed with a petroleum-based sports cream, the ultrasound energy facilitates the agent’s penetration into deeper tissues. The mechanical effects of the ultrasound—microstreaming and cavitation—temporarily disrupt the stratum corneum and enhance diffusion, making the medication reach underlying structures more effectively than it would with topical application alone. This demonstrates how combining ultrasound with a topical agent can amplify drug delivery. Other scenarios involve different techniques or heating effects that don’t describe this enhanced transdermal delivery.