Diathermy

Question 1

Diathermy Induction

Answer 1

greater magnetic that electric
pt. in magnetic field
greater flow in tissue with least resistance
eddy currents
tissue with high electrolytes= more inc in temp

Question 2

Diathermy Capacitor

Answer 2

Stronger electric that magnetic
pt. area between two plates
center of e-field has highest current density
greater resistance by tissue=greater heat

Question 3

Pad electrodes

Answer 3

need uniform contact
pad separation at least as wide as they are
several layers of towel
increase distance between pads=inc penetration depth

Question 4

Drum

Answer 4

monoplanar coil inside housing
towel between drum and skin to prevent hotspot
best penetration if housing contacts towel

Question 5

Air spaced plates

Answer 5

surrounded by glass/plastic guard
suited for area with lower fat
closer to skin=more heat

Question 6

Cables

Answer 6

pancake coil >6cm diameter
1cm toweling between coil and skin
spacers used to keep 5-10 cm between turns

Question 7

Indications for PSWD

Answer 7

Control pain and edema
control pain
would healing
nerve healing (animal tested)
bone healing (animal tested)

Question 8

Contraindications for PSWD

Answer 8

mag/tumor
pregnancy
pacemaker
contact lens/eye
pt. who hemorrhage/active bleeding
fever
metal
cardiac insufficiency 
growth plates
acute injuries
ischemic tissues

Question 9

Thermal effects

Answer 9

vasodilation
inc metabolism
mm. relax
inc pain threshold through sedation of nerve

perspiration, inc ext, nerve growth
inc body temp, pulse
decreased blood pressure

Question 10

Non thermal effects

Answer 10

repolarized damaged cells
regularize cell growth
re-establish Na pump
microvascular perfusion 
inc cell function
white blood cells to injured site
alter membrane activity, ca binding and ion binding phs

Question 11

How Diathermy functions

Answer 11

ion oscillation

dipole rotation