Electrical Stimulation Flashcards
Transfer of Electrons
Charge
Net charge of an object
Polarity
4 Fundamental Properties of ES
Positive & Negative charge
Like charges repel, opposites attract
Charge is neither created nor destroyed
Charge can be transferred
Net negative pole, produces positive charge
Cathode
Net positive pole, produces negative charge
Anode
Positive Ion
Cation
Negative Ion
Anion
Force that pushes charge
Voltage
Movement of Ions
Current (Amp/A)
Allows free movement
Conductors
Does not allow free movement
Insulators
Ohm’s Law
I = V/R = ohm
Opposition to flow of current
Resistance
Form of resistance that is frequency-dependent
Impedance
Produced by interference of 2 mediums (1,000 - 10,000 Hz) and is quadripolar
Interferential Current (IFC)
Twin-peaked monophasic pulsed current (150 to 500 V)
High Volt Pulsed Current (HVPC)
Effects of IFC
Therapeutic effects
Pain modulation
Muscle contraction
Effects of HVPC
Pain modulation
Wound/tissue healing
2,500 Hz carrier frequency and used for quads strengthening
Russian protocol
Other name for Russian Protocol
Medium Frequency Burst AC (MFburstAC)
Time-dependent parameters
Pulse duration
Phase duration
Interpulse interval
Magnitude of the current
Amplitude/Voltage/Intensity
of cycles/second
Frequency (Hz/pps)
Time which a train of pulses occur
On time
Time which there are no current flows
Off time
From zero to max amplitude
Ramp up time
Current amplitude to zero
Ramp down time
Effects of ES
Stimulation of AP in nerves
Muscle depolarization
Ionic effects
Contraindications of ES
Pacemakers
Placement over carotid sinus
Areas of venous/arterial thrombosis of thromobophlebitis
Pregnancy
Precautions of ES
Cardiac disease
Impaired mentation/sensation
Malignant tumors
Areas of skin irritation/wounds
Fibers recruited by physiological ms contraction
Slow-twitch Type I ms fibers
Fibers recruited by electrical stimulation ms contraction
Fast twitch Type II ms fibers
2 principles of ES ms contraction
Overload
Specificity
Application of EC to motor nerves to produce contractions of ms they innervate
Neuromuscular Electrical Stimulation (NMES)
Application of EC to produce ms contraction during functional activity
Functional Electrical Stimulation (FES)
Application of EC directly on to the ms to produce contraction
Electrical Muscle Stimulation (EMS)
Parameters for muscle strengthening
PF: 35-80 pps/Hz
PD: 150-200 μs (Small), 200-350 μs (Large)
On/Off: 1:5
RT: 2 secs
TT: 10-20 mins
x/Day: Every 2-3 hrs
Parameters for muscle reeducation
PF: 35-50 pps/Hz
PD: 150-200 μs (Small), 200-350 μs (Large)
On/Off: depends on functional activity
RT: 2 sec
TT: Depends on functional activity (10-20 mins)
x/Day: NA
Muscle spasm reduction
PF: 35-50 pps/Hz
PD: 150-200 μs (Small), 200-350 μs (Large)
On/Off: 1:1 (2-5 seconds)
RT: 1 secs
TT: 10-30 mins
x/Day: Every 2-3 hrs
Application of ES to Ortho conditions
ACL reocnstruction
Application of ES to Ortho conditions
ACL reconstruction
Total Knee Arthroplasty
RA
PFPS
Short-duration, higher frequency pulses. Stimulates A beta; acute and chronic pain
Conventional TENS (high-rate TENS)
Longer pulse duration and higher amplitudes. Stimulates A delta.
Acupuncture-like TENS (low-rate TENS)
Stimulation is delivered in bursts. Stimulates A delta and beta.
Burst-mode TENS
Indicated for painful procedure such as labor and wound debridement
Brief-intense TENS
Uses small electrodes to focal effect
Hyper-stimulation TENS
Electrodes are placed on the skin overlying acupuncture points
Electroacupuncture
Parameters for Conventional TENS
PF: 100-150 pps/Hz
PD: 50-80 μs
A: Tingling
TT: Maybe used for 24 hrs
P: Acute/Chronic
Parameters for Acupuncture
PF: 2-10 pps/Hz
PD: 200-300 μs
A: Visible contraction
TT: 20-30 mins
P: Chronic
Parameters for Burst-mode
PF: 50-100 pps/Hz
PD: 50-200 μs
A: Visible contraction
TT: 20-30 mins
P: Diffuse
Parameters for Brief Intense
PF: 80-150 pps/Hz
PD: 50-250 μs
A: Highest tolerable
TT: < 15 mins
P: Painful procedures
Parameters for Hyperstimulation
PF: 1-5 pps/Hz
PD: 150-300 μs
A: Visible contraction
TT: 30-60 secs/area
P: MPS, Taut bands