Flashcards in Part 2 Deck (45)
Monophonic current uses what specific type of current?
What is another name for monophasic current ?
Current flow in one direction is a characteristic of what?
Biphasic current uses what specific type of current?
What type of currents flow of electrons changes direction regularly?
What is the time it takes current to leave the isoelectric line to when it returns to this line called?
What is the phase duration for monophasic ?
Phase duration and pulse duration are the same
What is the phase duration in biphasic ?
two phase durations for each pulse
High peak current is associated with what?
Greater depth of penetration (leads to more muscle recruitment)
Do large diameter nerves have a high or low capacitance?
Low (reach threshold quickly)
Do tissues respond to phase duration or pulse duration?
The intensity or magnitude of the current is know as?
What is the maximum amplitude of the current REGARDLESS of duration?
Amplitude must be high enough to....?
Reach threshold of muscle or nerve
Amplitude is high enough to reach threshold of a nerve or muscle what responds first ?
What two things does average current take into consideration?
Peak amplitude and phase duration
How do you alter the phase charge?
Amplitude and phase duration
What fibers are stimulated first A-beta or A-alpha?
What fibers must be initiated for a muscle to contract?
A-Alpha (motor fiber)
A burning or needling sensation during therapy signals what?
You have exceeded the a delta fiber capacitance
The time required to depolarize a never fiber when the peak current is twice rheobase is known as what ?
When amplitude is _______ rheobase and the phase duration is _____ ________ than chronaxie the rudest will be greatest comfort to the patient/
Twice, slightly greater
What is the rate limiting factor of the number of impulse that can be generated by a nerve known as?
Absolute refactor period
Stimulation at high frequency near refractory period of the sensory never causes inhibition known as?
What leads to summation?
What is the hz in wedenskis inhibition?
What is the hz for low frequency generators and what does it do?
1000, Produce action potentials
What are medium frequency generators IN hz?
Interferential current uses what hz range?
Russian stimulation uses a carrier frequency of what?
Intrinsic duty cycle of 10ms on and 50 ms off creates what?
A burst frequency of 50hz
What is the hz range for high frequency ?
High frequency generators are used for what/
Diathermy uses high frequency and creates what?
Minimal sensory deficits
Unequal electrode size will concentrate the current in which electrode?
The smaller one
What would you do to concentrate the current in superficial tissues?
You'd places the electrodes close together
Monoploar uses how may electrodes?
2 unequal sized electrodes
Does monopolar use AC or DC current?
If resistance increases, what will n emended to get the same current flow?
Is monopolar active at the target site?
(Dispersive away from target site)
What is the most common electrode configuration for TENS?
What do the electrodes look like in bipolar?
2 equal sized electrodes over the treatment site
What kind of configuration is seen with interferential current?
What is the configuration for quadripolar?
2 separate medium frequency currents with electrodes placed at cross currents