DIATHERMY. PT 156: Physical Agents 1. Aila Nica J. Bandong , PTRP Instructor Department of Physical Therapy UP-College of Allied Medical Professions. Objectives. At the end of the lecture, the students should be able to: Define diathermy Identify the parts of the SWD/MWD machine
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PT 156: Physical Agents 1
AilaNica J. Bandong, PTRP
Department of Physical Therapy
UP-College of Allied Medical Professions
At the end of the lecture, the students should be able to:
- longest wavelength 300 – 30 m
- most penetrating
- no longer utilized due to high potential of causing burns and interference with radio transmissions
- 27.12 MHz
- 11 m
- 15 to 800 Hz
- 25 to 400 microseconds
- 100 to 1000 watts
- 20 minutes (5-15 acute; 10-20 chronic)
Cycle Duration = 1000 / PRR
% cycle SWD delivered =
(PD x 100) / Cycle Duration
Mean Power delivered =
PPP x % cycle SWD
SPECIFIC ABSORPTION RATE
Electrical field magnitude
vascular tissues as well
- aka Transverse positioning
- plates are on either side of the limb
- plates parallel with the longitudinal section of the body part; same side
- plates are placed at each end of the limb
Electrodes should be:
- conflicting evidence as regards effectiveness of SWD
- controlled animal studies revealed insignificant results as well as trials involving human subjects (Kitchen and Bazin, 1996); to date, no studies in the treatment setting was conducted
- inconclusive results following three double-blind protocols (Kitchen and Bazin)
- Pulsed SWD may provide better pain relief in some musculoskeletal conditions (neck and back) than SWD
- studies were done on cats and rats
- PSWD induced regeneration of axons, acceleration and recovery of nerve conduction
- no established effect
- insignificant (abdominal surgery
A. 122.5 mm – 2456 MHz
B. 327 mm – 915 MHz
C. 690 mm – 433.9 MHz
chronic 10 to 20 minutes
- energy is taken up by the material
- pass through the material without being absorbed
- direction of propagation is altered
- turned back from the surface
Gorgon, E. J. (2004). Lecture notes on high frequency currents: Shortwave and microwave diathermy. University of the Philippines- College of Allied Medical Professions.
Hayes, K. W. (1993). Manual for physical agents (4th Ed). Connecticut: Appleton and Lange.
Hecox, B., Mehreteab, T. A., and Weisberg, J. (1994). Physical agents: A comprehensive text for physical therapists. Connecticut: Appleton and Lange.
Kitchen, S. and Bazin, S. (1996). Clayton’s electrotherapy (10th ed). Philadelphia: W.B. Saunders Company.
Low, R. Reed, A. (1995). Electrotherapy explained: Principles and practice (2nd Ed). Oxford: Butterworth-Heinemann Ltd.
Michlovitz, S. L. (1996). Thermal agents in rehabilitation (3rd Ed). Philadelphia: F. A. Davis Company.