PULSED SHORTWAVE DIATHERMY (PSWD) THERAPY

 


WHAT IS PULSED SHORTWAVE DIATHERMY (PSWD)

Pulsed short wave diathermy is also short wave diathermy but pulsed at the rate selected by the therapist. the pulsed frequency range from 15 Hz to 200 Hz and the maximum intensity produced by the machine is 1000 watts. while the pulsed duration is constant at 0.4 ms and square pulses are used.

there are no cumulative thermal effects in pulsed short wave diathermy because the pulsing output of the machine is produced by one pulse which is in very short duration, as it is dissipated by the circulation before the next pulse occurs.

GENERATION OF PULSED SHORTWAVE DIATHERMY

In pulsed short wave diathermy each pulse train has a preset duration or on time and is separated from successive pulse trains by an off time, that is determined by the pulse repetition rate or frequency depending on the pulsed radio frequency radiation (PRFR) device. the pulse frequency can be varied from 1 to 7000 pulses per second and is selected with a pulse frequency control on the equipment operation panel. hence, bursts of pulsed trains containing a series of high frequency sine wave oscillations are emitted from the applicator.

the production of desired effect is produced by the pulsed radio frequency radiation (PRFR) which is same like continues short wave diathermy (CSWD)  and has the ability to raise tissue temperature, inducing of heat in tissue by pulsed short wave diathermy depends on three parameters that in combined give a mean power output that ranges between 38 and 665 watts. the three parameters are:

  • Peak pulse power
  • Pulse frequency
  • Pulse duration

BIOLOGICAL EFFECTS OF PULSED SHORTWAVE DIATHERMY

  • Relief of pain
  • Stimulates the peripheral circulation
  • Stimulates the early closure of wounds 
  • Increases metabolism by 2 to 3 times
  • Relaxes muscle spasm

INDICATIONS OF PULSED SHORTWAVE DIATHERMY

(1) Contusions
(2) Sinusitis
(3) Sprains
(4) Ruptures
(5) Bursitis

CONTRAINDICATIONS OF PULSED SHORTWAVE DIATHERMY

(1) Pacemakers

(2) High fever

(3) Tumors

(4) Metal implants.



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