Cavitation in ultrasound therapy results in which of the following?

Cavitation in ultrasound therapy results in which of the following?

• A. Expansion and compression of gas or vapor filled cavities (gas bubbles)
• B. Decrease in membrane permeability
• C. No effect on membranes
• D. Decreases healing

Answer: (A)

Cavitation in ultrasound therapy refers to the behavior of gas or vapor–filled bubbles in tissue when exposed to the alternating pressure of the sound waves. As the waves cycle, bubbles respond by expanding during the low-pressure phase and contracting during the high-pressure phase. In some cases, these bubbles can even collapse violently. This expansion and compression of gas-filled cavities is the defining feature of cavitation and drives the mechanical effects seen in tissues, such as microstreaming and localized stresses. These bubble dynamics can increase membrane permeability and influence interactions at the cellular level, which is why cavitation is leveraged to enhance therapeutic effects like drug delivery or tissue modification. It does not imply a universal decrease in permeability, no effect on membranes, or a blanket decrease in healing; instead, the mechanical activity of the bubbles is what mediates these tissue interactions.

Cavitation in ultrasound therapy refers to the behavior of gas or vapor–filled bubbles in tissue when exposed to the alternating pressure of the sound waves. As the waves cycle, bubbles respond by expanding during the low-pressure phase and contracting during the high-pressure phase. In some cases, these bubbles can even collapse violently. This expansion and compression of gas-filled cavities is the defining feature of cavitation and drives the mechanical effects seen in tissues, such as microstreaming and localized stresses.

These bubble dynamics can increase membrane permeability and influence interactions at the cellular level, which is why cavitation is leveraged to enhance therapeutic effects like drug delivery or tissue modification. It does not imply a universal decrease in permeability, no effect on membranes, or a blanket decrease in healing; instead, the mechanical activity of the bubbles is what mediates these tissue interactions.