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Electrical Stimulation Treatment Strategies HVPS: Neuromuscular Stimulation • • • • Output Intensity Strong, intense, comfortable contractions. Pulse frequency If duty cycle cannot be adjusted: Low for individual muscle contractions (<15 pps). Adjustable duty cycle: Moderate for tonic contractions (>50 pps). Duty Cycle Initial treatments should begin with a low (e.g, 20%) duty cycle and be increased as the muscle responds. Electrode placement Bipolar: Proximal and distal to the muscle (or muscle group) to be stimulated. This method offers the most direct method of stimulating specific areas. Monopolar: Over motor points or muscle belly. Place the cathode over motor points Bipolar electrode arrangement HVPS: Sensory-level Pain Control • • • • • • Output Intensity Pulse frequency Phase duration Mode Electrode arrangement Polarity • Electrode placement * Not adjustable on most HVPS units. Sensory level 60 to 100 pps <100 µsec* Continuous Monopolar or bipolar Acute: Positive Chronic: Negative Directly over or surrounding the painful site HVPS: Motor-level Pain Control • • • • • • Output Intensity Pulse rate Phase duration Mode Electrode arrangement Polarity • Electrode placement Motor level 2–4 pps 150–250 µsec Continuous Monopolar or bipolar Acute: positive Chronic: Negative Directly over the painful site, distal to the spinal nerve root origin, trigger points, or acupuncture points HVPS: Brief-Intense Pain Control Protocol • • • • Output Intensity Pulse rate Phase duration Mode • Electrode arrangement • Polarity • Probe placement Noxious >120 pps 300 to 1000 µsec Probe 15 to 60 sec at each site Monopolar (probe) Acute: Positive Chronic: Negative Gridding technique, stimulating hypersensitive areas working from distal to proximal HVPS: Sensory-level Edema Control • • • • Intensity: Sensory level Pulse duration: Maximum possible duration Pulse frequency: 120 pps. Polarity: Negative electrodes over injured tissues • Mode: Continuous • Electrode placement: The immersion method should be used when possible, or the active electrodes should be grouped over and around the target tissues. • Treatment duration – Anode (+) Four 30-minute treatments, followed by 60minute rest periods or – Four 30-minute treatments, each followed by 30-minute rest periods. • Comments – – – Start treatment as soon as possible after the trauma. The body part should be wrapped and elevated between sessions. This treatment regimen should not performed if gross swelling is present. Cathode (-) HVPS: Edema Reduction • Intensity: Strong, yet comfortable muscle contraction – Avoid contraindicated joint motio • • • • Pulse frequency: Low Polarity: Positive or negative. Mode: Alternating. Electrode placement – Bipolar: Proximal and distal ends of the muscle group proximal to the edematous area. – Monopolar: Active electrodes follow the course of the venous return system. • Comment: Ice may be applied to the injured area, but this could impede venous return by increasing the viscosity of fluids in the area IFS: Sensory-level Pain Control • Carrier Frequency: Based on patient comfort • Burst Frequency: 80 to 150 Hz • Sweep: Fast • Electrode Arrangement: Quadripolar • Electrode Placement: Around the periphery of the target area • Output Intensity: Strong sensory level • Treatment Duration: 20 to 30 minutes Premodulated Neuromuscular Stimulation • • • • • • • Carrier Frequency: 2500 Hz Burst Frequency: 30 to 60 bps Burst Duty Cycle: 10 percent Cycle Duration: 400 µsec On/off Duty Cycle: 10:50 sec Ramp: 2 sec Electrode Placement: Bipolar: Proximal and distal ends of the muscle • Output Intensity: Strong muscle contraction. Discomfort may be experienced • Treatment Duration: 10 cycles or until fatigue occurs