2. Sreeraj S R Pulsed Shortwave Pulsed electromagnetic energy
(PEME) Pulsed electromagnetic field (PEMF) Pulsed electromagnetic
energy treatment (PEMET) Pulsed electromagnetic therapy (PEMT) 3.
Sreeraj S R Pulsed Shortwave PSWT involves a device that delivers
an electric and magnetic field in short pulses with a time gap in
between. PSW employs the same operating frequency as traditional
SWD i.e.. 27.12MHz. The mean power delivered to the patient is
relatively low even though the peak power (i.e. during the on
pulses) can be quite high up to 1000W. 4. Sreeraj S R Parameters
Pulse Duration the duration (time) of each ON phase. 25 400 s Pulse
Repetition Rate the number of pulses delivered per second. 15 800
Hz Peak Pulse Power The amplitude of the pulse / intensity. 100
1000 W Mean Power Power delivered from the machine (during pulse
and averaged) 5. Sreeraj S R PSWD Mean Power Calculations MP (W) =
PP (W) x PW (s) x PRR (Hz) MP (W) = 250 W x 400s x 145Hz MP (W) =
14.5W A microsecond is one millionth (106) of a second so 400 s is
400 x 10-6 s 6. Sreeraj S R Machine Output ELECTRIC field,
comparable to the condenser (capacitor) field in traditional SWD
MAGNETIC field, comparable to inductothermy. 7. Sreeraj S R Tissue
Heating No accumulation More non thermal Both thermal and non
thermal 8. Sreeraj S R Mechanism of Effect 9. Sreeraj S R Primary
Effects of PSWD 1. Increased number of white cells, fibroblasts etc
in a wound. 2. Improved rate of edema dispersion. 3. Encourages
absorption of heamatoma. 4. Reduction (resolution) of the
inflammatory process. 5. Prompts a more rapid rate of orientation
& deposition of collagen. 6. Encourages collagen layering at an
early stage. 7. Stimulation of osteogenesis. 8. Improved healing of
the peripheral & central nervous systems 10. Sreeraj S R
Treatment Doses Acute conditions Mean power of less than 3 Watts.
Time : 10 15 minutes Sub Acute Conditions Mean power of between 2
and 5 Watts Time : 15 minutes Chronic Conditions Mean power of more
than 5 Watts Time : 15 20 minutes 11. Sreeraj S R Contraindications
Pacemakers Pregnancy Tissue bleeding Malignancy Active tuberculosis
Active epiphyseal regions in children Severe circulatory compromise
Deep X Ray therapy or other ionizing radiations (in the last 6
months) Patients who are unable to comprehend the therapists
instructions Metal in the tissues Menstruation Specialized tissues
(e.g. eye and testes) 12. Sreeraj S R SWD vs. PSW SWD PSW
Electromagnetic energy absorption Thermal Non Thermal 400 500 W
max. output Max. mean output in the region of 40 W molecular KE and
heat primary effects appears to be at the cell membrane level &
transport of ions across the membrane. Cell ion binding properties
Cell membrane potentials Protein synthesis cellular energy (ATP)
Cell metabolism Enhance soft tissue healing 13. Sreeraj S R
References 1. http://www.electrotherapy.org/modalities/pswt.htm 2.
http://sprunig.net/wp-content/uploads/Use-of-different-doses-of-
pulsed-short-waves-in-the-treatment-of-patients-with-osteoarthritis-
of-the-knee_2008.pdf 3.
http://www.healthcentre.org.uk/physiotherapists/physiotherapist-
pulsed-shortwave-therapy.html
