Which pairing correctly describes the modes of diathermy application?

• A. Continuous mode produces heat for subacute conditions and pulsed mode yields nonthermal effects for acute conditions
• B. Continuous mode yields nonthermal effects for acute conditions
• C. Pulsed mode produces heat for subacute conditions
• D. Continuous mode yields heat for chronic conditions

Answer: (A)

Diathermy modes differ in how they deliver energy: continuous mode sends energy without interruption, producing heating deep in the tissues, while pulsed mode turns the energy on and off, which lowers the average power and often yields nonthermal physiological effects.

This pairing is correct because continuous diathermy creates a thermal response, making it useful when a deeper heat effect is desired in subacute conditions to promote tissue extensibility and circulation. Pulsed diathermy, by delivering energy in bursts, minimizes overall heating and tends to produce nonthermal effects that can aid acute tissue repair and reduce inflammation without overheating tissue.

The other options aren’t accurate descriptions: continuous mode does not yield nonthermal effects; pulsed mode is not primarily used to produce heat for subacute conditions; and while continuous mode does generate heat, stating it only for chronic conditions misses the typical acute/subacute rationale and the emphasis on thermal versus nonthermal effects.