Skip to main content
UploadLanguage (EN)Support
BusinessMobileSocial MediaMarketingTechnologyArt & PhotosCareerDesignEducationPresentations & Public SpeakingGovernment & NonprofitHealthcareInternetLawLeadership & ManagementAutomotiveEngineeringSoftwareRecruiting & HRRetailSalesServicesScienceSmall Business & EntrepreneurshipFoodEnvironmentEconomy & FinanceData & AnalyticsInvestor RelationsSportsSpiritualNews & PoliticsTravelSelf ImprovementReal EstateEntertainment & HumorHealth & MedicineDevices & HardwareLifestyle
Sreeraj S R, profile picture
Uploaded bySreeraj S R
PDF, PPTX33,201 views

Pulsed shortwave

This document discusses pulsed shortwave therapy (PSWT), which delivers pulsed electromagnetic energy in short pulses with time gaps between. PSWT uses a similar 27.12MHz frequency as traditional shortwave diathermy but with lower mean power of 2-5W. It results in non-thermal tissue heating through effects on cell membranes and ion transport. PSWT is shown to increase healing factors like white blood cells in wounds and reduce edema and inflammation. Treatment doses and contraindications are provided. PSWT is compared to traditional shortwave diathermy, with PSWT having non-thermal rather than thermal effects.

Health & Medicine◦Technology◦
Download as PDF, PPTX
Sreeraj S R Pulsed Shortwave
Sreeraj S R Pulsed Shortwave • Pulsed electromagnetic energy (PEME) • Pulsed electromagnetic field (PEMF) • Pulsed electromagnetic energy treatment (PEMET) • Pulsed electromagnetic therapy (PEMT)
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.
Sreeraj S R Parameters • Pulse Duration the duration (time) of each ‘ON’ phase. 25 – 400 µs • 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)
Sreeraj S R PSWD Mean Power Calculations • MP (W) = PP (W) x PW (s) x PRR (Hz) • MP (W) = 250 W x 400µs x 145Hz • MP (W) = 14.5W • A microsecond is one millionth (10−6) of a second so • 400 µs is 400 x 10-6 s
Sreeraj S R Machine Output • ELECTRIC field, comparable to the condenser (capacitor) field in traditional SWD • MAGNETIC field, comparable to inductothermy.
Sreeraj S R Tissue Heating • No accumulation • More non thermal • Both thermal and non thermal
Sreeraj S R Mechanism of Effect
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
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
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)
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
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