Flashcards in Part 2 Deck (45)
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1
Monophonic current uses what specific type of current?
DIRECT
2
What is another name for monophasic current ?
Galvanic
3
Current flow in one direction is a characteristic of what?
Monophasic current
4
Biphasic current uses what specific type of current?
Alternating (AC)
5
What type of currents flow of electrons changes direction regularly?
Biphasic
6
What is the time it takes current to leave the isoelectric line to when it returns to this line called?
Phase duration
7
What is the phase duration for monophasic ?
Phase duration and pulse duration are the same
8
What is the phase duration in biphasic ?
two phase durations for each pulse
9
High peak current is associated with what?
Greater depth of penetration (leads to more muscle recruitment)
10
Do large diameter nerves have a high or low capacitance?
Low (reach threshold quickly)
11
Do tissues respond to phase duration or pulse duration?
Phase duration
12
The intensity or magnitude of the current is know as?
Amplitude
13
What is the maximum amplitude of the current REGARDLESS of duration?
Peak current
14
Amplitude must be high enough to....?
Reach threshold of muscle or nerve
15
Amplitude is high enough to reach threshold of a nerve or muscle what responds first ?
Sensory
16
What two things does average current take into consideration?
Peak amplitude and phase duration
17
How do you alter the phase charge?
Amplitude and phase duration
18
What fibers are stimulated first A-beta or A-alpha?
A-beta
19
What fibers must be initiated for a muscle to contract?
A-Alpha (motor fiber)
20
A burning or needling sensation during therapy signals what?
You have exceeded the a delta fiber capacitance
21
The time required to depolarize a never fiber when the peak current is twice rheobase is known as what ?
Chronaxie
22
When amplitude is _______ rheobase and the phase duration is _____ ________ than chronaxie the rudest will be greatest comfort to the patient/
Twice, slightly greater
23
What is the rate limiting factor of the number of impulse that can be generated by a nerve known as?
Absolute refactor period
24
Stimulation at high frequency near refractory period of the sensory never causes inhibition known as?
Wedenskis inhibition
25
What leads to summation?
Higher frequency
26
What is the hz in wedenskis inhibition?
>1000
27
What is the hz for low frequency generators and what does it do?
1000, Produce action potentials
28
What are medium frequency generators IN hz?
1000-100,000
29
Interferential current uses what hz range?
3,000-5000
30
Russian stimulation uses a carrier frequency of what?
2,500
31
Intrinsic duty cycle of 10ms on and 50 ms off creates what?
A burst frequency of 50hz
32
What is the hz range for high frequency ?
<100,000
33
High frequency generators are used for what/
Thermal (heat)
34
Diathermy uses high frequency and creates what?
Minimal sensory deficits
35
Unequal electrode size will concentrate the current in which electrode?
The smaller one
36
What would you do to concentrate the current in superficial tissues?
You'd places the electrodes close together
37
Monoploar uses how may electrodes?
2 unequal sized electrodes
38
Does monopolar use AC or DC current?
Either one
39
If resistance increases, what will n emended to get the same current flow?
More voltage
40
Is monopolar active at the target site?
Yes
(Dispersive away from target site)
41
What is the most common electrode configuration for TENS?
Bipolar
42
What do the electrodes look like in bipolar?
2 equal sized electrodes over the treatment site
43
What kind of configuration is seen with interferential current?
Quadripolar
44
What is the configuration for quadripolar?
2 separate medium frequency currents with electrodes placed at cross currents
45
