Shortwave Diathermy. Chapter 9. Description. High-frequency electrical currents Radio waves Pass through the tissues Cause molecular vibration Results in deep heating Capable of heating large volumes of tissues Causes both thermal and nonthermal effects. Thermal Effects Deep heat
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Energy type Acoustical Electromagnetic
Tissue heated Collage-rich C: Skin, adipose tissue
I: Muscle, vessels
Tissue volume Small (20 cm2) Large (200 cm2)
Temp increase 1 MHz: > 6.3°F C: > 7°F
3 MHz: > 14.9°F I: > 18°F
Heat retention 3 min > 9 min
C = Capacitive method
I = Induction method
Blood and Fluid Dynamics
Peripheral vascular disease
Perspiration and moist dressings: The water collects and concentrates the heat.
Tendency to hemorrhage, including menstruation.
Areas of particular sensitivity:
Epiphyseal plates in children
Sites of infection
The abdomen with an implanted intrauterine device (IUD)
The eyes and face
Application through the skullContraindications