The capacitive diathermy method primarily produces heat by which mechanism?

The capacitive diathermy method primarily produces heat by which mechanism?

• A. Thermal through convection
• B. Thermal through conduction
• C. Nonthermal heating
• D. Magnetic heating

Answer: (A)

Capacitive diathermy heats tissue mainly through dielectric heating: the alternating electric field between the capacitor plates causes polar molecules in the tissue, especially water, to continuously reorient. This rapid dipole rotation converts the electromagnetic energy directly into heat inside the tissue. It’s not heat produced by convection (movement of fluid) or by magnetic heating (that’s the domain of inductive diathermy), and it isn’t a nonthermal effect. So the primary mechanism is conversion heating within the tissue due to dielectric losses, with the resulting warmth then spreading to adjacent areas by conduction and being carried away by blood flow (convection).

Capacitive diathermy heats tissue mainly through dielectric heating: the alternating electric field between the capacitor plates causes polar molecules in the tissue, especially water, to continuously reorient. This rapid dipole rotation converts the electromagnetic energy directly into heat inside the tissue. It’s not heat produced by convection (movement of fluid) or by magnetic heating (that’s the domain of inductive diathermy), and it isn’t a nonthermal effect. So the primary mechanism is conversion heating within the tissue due to dielectric losses, with the resulting warmth then spreading to adjacent areas by conduction and being carried away by blood flow (convection).