10 - Diathermy Flashcards
1
Q
Diathermy def
A
high-frequency electromagnetic energy
2
Q
Shortwave diathermy
A
electrodes beams short waves into body part
- MC type of unit
- uses radio transmitter
3
Q
Microwave diathermy
A
applicator beams microwaves to part
- not as safe shortwave
- FCC regulated
4
Q
thermal effects
A
- dipole rotation = rotating molecules with two charges (ie water)
- ionic oscillation = ions will oscillate back and forth (ie, sodium, potassium, chlorine)
- kinetic energy from rotation –> thermal energy
5
Q
Diathermy electrode types
A
- capacitor electrode –> electrical field
- induction electrode –> magnetic field
6
Q
Capacitive technique
A
- tissue placed an electric field
- greatest absorption and tissue with low electrolyte and water content
- use with:patients/areas with low subcutaneous fat
7
Q
Inductive technique
A
MC type
- tissues placed an oscillating magnetic field
- greatest absorption in high electrolyte, high dipole tissue (deep, muscle/tendon/joint)
- use with: patients with more subcutaneous fat
8
Q
Four laws of diathermy
A
- Arndt-Schultz law:dose versus response
- dose versus response
- low dose = stimulation, high dose = inhibition
- Grotthus-draper law
- absorbed versus therapeutic effect
- inverse square law
- dose versus divergence
- intensity = 1/(distance)2
- cosine law
- application of angle
- reduce energy if angle is moved out of 90°
9
Q
diathermy types of interaction
A
- transmission
- absorption
- reflection
- refraction
- scatter
10
Q
Continuous shortwave diathermy (CSWD)
A
- less common
11
Q
Pulsed shortwave diathermy (PSWD)
A
- MC
- heat versus no he
12
Q
Diathermy heat used for
A
- pain relief
- wound management
- joint contracture
13
Q
Counterirritation
A
using another stem to distract the body thus preventing pain signals from being perceived
14
Q
Diathermy indications
A
- research
- muscle skeletal injuries/pain
15
Q
Diathermy risk factors
A
- pregnant operator
- copper IUDs
- other patients near device
- other EPA devices
- mentally confused patients
