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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

What are things associated with interferential current?

Also called IF IFC, true interferential, pre modulated-vector scar stereodynamic