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physiotherapy > high frequency current > Flashcards

high frequency current Flashcards

1
Q

what is the freq of a HFC

A

100,000 and above

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2
Q

describe HFC

A

Anti inflammatory effect d/2 endogenous heat(w/in tissues)
Molecules w/in tissues have +ve / -ve polarity
Electrodes attract oppositely charged molecules
The attraction causes molecular vibz-> endogenous heat

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3
Q

what are the effects of endogenous heat

A

Longer lasting
Stim reticuloendothelial system and anti inflam cells
No effect on thermoregulatory centre and CV

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4
Q

what are the two types of HFC

A

D’arsonoval and microwaves (decimetric and centrimetric currents(

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5
Q

d’arsonoval current wavelenth

A

2000/3000m

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6
Q

d’arsonoval current

freq

A

200-300khz

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7
Q

what type of current is d’arsonoval

A

alternating

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8
Q

how is the d’arsonoval current applied

A

Applicator is a glass electrode. Sltn w/in turns pink/blue when current is generated

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9
Q

what effect does the magnetic component of d’arsonoval curretns have

A

general

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10
Q

what effect does the electric component of d’arsonoval curretns have

A

local. w/ 3 types of effects
1. distant effect
2. contact effect
3. analgesic effect

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11
Q

distant effect of d’arsonoval currents

A

increased distance has increased iritative and anti itching effects and burning effects

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12
Q

contact effect of d’arsonoval currents

A

glass electrode in close contact w/ skin. Longitudinally moved along vessels or concentric movements. Pin prick sensation

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13
Q

Analgesic effect of d’arsonoval currents

A

d/2 sim of Abeta nerve fibers that inhibit nociception

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14
Q

how is the d’arsonoval current generated

A

Charge both plates
Energy travels to self inductive coil
Once fully charged the energy returns to the plates
This stims endogenous heat and anti inflam effect

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15
Q

indications for d’arsonoval current

A

Hair loss
Cosmetics
Stimulation of circ
Renal diseases
Buergers disease
Slow healing wounds - stimulates skin regeneration
CVD pt -e.g. Ist stage arterial hypertension
Bactericidal effect- high temp stims leukocytes

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16
Q

contraindications of d’arsonoval currents

A
  • metal implants

- low and medium freq currents

17
Q

Decimetric and centrimetric currents (microwaves)

structure

A

-vley charged cathode in centre
Resonating cavities are several circuits
This causes oscillation of electrons w/in the cavities and they accelerate
apposite acceleration causes electron migration towards the applicator(glass rod)

18
Q

define diathermy

A

production of heat in a part of the body by high-frequency electric currents, to stimulate the circulation, relieve pain, destroy unhealthy tissue, or cause bleeding vessels to clot.

19
Q

effect of diathermy w/ 1 celsius increase

A

anti inflamm. Increase metabolism

20
Q

effect of diathermy w/ 2-3celsius increase

A

analgesia, reduce muscle spasm

21
Q

effect of diathermy w/ 3-4 celsius increase

A

promotes collagen extensibility

22
Q

Short wave diathermy: freq

A

27.12 megahz

23
Q

Short wave diathermy: current type

A

sinusoidal currents

24
Q

Short wave diathermy: application

A

magnetic field or electric current

25
Q

Short wave diathermy:wavelength =

A

11.06m

26
Q

Short wave diathermy: dose

A

pt subjective

27
Q

diathermy rx for acute pain

A

athermal and oligothermal rx

28
Q

diathermy rx for chronic pain

A

thermal and hyperthermal rx

29
Q

types of diathermy electrode meters

A

capcitive and inductive

30
Q

what does the capacitive electrode meter do

A

Electrical

Stimulates endo heat in tissues w/ increased resistance e.g. bone, brain, fat

31
Q

what does the inductive electrode meter do

A

Magnetic

Used for tissues containing liquid e.g. lymph, blood vessels

32
Q

why does d’arsonovalization generate the least amount of endo heat out of all the HFC

A

The fading d’arsonoval wave

physiotherapy (17 decks)

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