In phonophoresis, what modality, intensity, and duration are typical?

In phonophoresis, what modality, intensity, and duration are typical?

• A. Continuous ultrasound, 1.0 to 1.5 W/cm2 for 5 to 15 minutes
• B. Pulsed ultrasound, 0.5-1.0 W/cm2 for 20 minutes
• C. Continuous ultrasound, 3-4 W/cm2 for 30 minutes
• D. Pulsed ultrasound, 0.1-0.3 W/cm2 for 5 minutes

Answer: (A)

Phonophoresis uses ultrasound to enhance the delivery of a topically applied medication through the skin by combining thermal and mechanical effects to boost diffusion. The typical approach uses continuous ultrasound because steady energy maintains a consistent heating effect that helps drive the drug across the skin, while avoiding the risks of overheating that can come with longer pulsed exposure. An intensity of about 1.0 to 1.5 W/cm² provides enough energy to promote diffusion without excessive heating, and a duration of 5 to 15 minutes offers a practical balance between effective drug delivery and safety. Using pulsed ultrasound at very low intensities or much higher intensities for longer times would either reduce the diffusion benefit or raise safety concerns, making those options less representative of standard phonophoresis protocols.

Phonophoresis uses ultrasound to enhance the delivery of a topically applied medication through the skin by combining thermal and mechanical effects to boost diffusion. The typical approach uses continuous ultrasound because steady energy maintains a consistent heating effect that helps drive the drug across the skin, while avoiding the risks of overheating that can come with longer pulsed exposure. An intensity of about 1.0 to 1.5 W/cm² provides enough energy to promote diffusion without excessive heating, and a duration of 5 to 15 minutes offers a practical balance between effective drug delivery and safety. Using pulsed ultrasound at very low intensities or much higher intensities for longer times would either reduce the diffusion benefit or raise safety concerns, making those options less representative of standard phonophoresis protocols.