Card Set Information
What is the first law of thermodynamics?
conservation of energy
heat-formed from random molecular movement; has to be a different temp for heat to be transferred
temperature-measurement of average kinetic energy of a substance
therapeutic temperature ranges
What is the second law of thermodynamics?
heat transfer (from hot to cold)
What does the Arndt-Schultz principle state?
you must give enough heat/cold to make a difference, but not too much to cause damage. any amount below level will have no therapeutic effect
What are the 5 methods of heat transfer?
conduction-HP, CP, paraffin
evaporation-vapor coolant spray
What are some factors that affect your choice of treatment method?
consider body part
depth of target tissue
ease of application
ability to do exercises with modality on
duration of treatment
expense, operation, and maintenance of machine
always rely on research, not salesperson
What is thermoregulation of the body?
how body handles temp.
fluctuations of temp thru out the body
perspiration, shivering (vasodilation/constriction)
temp decreased in morning, increased in evening
When applying thermal agents to small areas the effects remain local; how does treating large areas affect the body?
affects systemically....vitals..bp, heart rate etc
What are the 4 effects on blood flow while applying local heat?
1.increased blood flow bc of vasodilation(bodys way to get rid of excess heat)
2.increased capillary permeability (better exhange of chemicals across barrier)
3.increased nutrients(o2, rbc, etc to the tissues)
4.effects on the skin
Within what amount of time do you see the greatest increase of skin temp?
within first 4 mins and then continues to increase for the next 3 mins
Within what time frame do most burns occur?
How does local heat effect metabolism?
2.which aids in healing process (brings good to injured area and helps take junk away)
What are the properties of connective tissue (collagen)?
ability to deform and elongate with stretch
viscosity allows it to remain at slightly greater lenth after stretch
stretched only within the limits of tissues elasticity
What happens if we heat up collagen?
its viscosity (thickness) decreases and the elasticity increases
effects collagen best if goal of tx is to stretch out tissues
put heat on prior to stretching, heat while we stretch, continue stretching after heat is removed
What 2 effects on pain does heat have?
counterirritant-gate theory-pt doesnt feel as much pain
pain-spasm-pain cycle- increases blood flow and helps remove waste to help stop pain cycle
What effects does heat have on motor?
decreases muscle spindle excitability (makes muscles contract)-alters strength for 30 mins (less strong)
How does heat effect skin resistance?
decreases resistance (impedence)
things can pass thru skin easier after heat
What kind of systemic effects does heat produce?
increases core body temp
heart rate increases (10bmp/every 1 degree F increase), metabolism and blood volume, o2 consumption increases
*depends on treatment time, area of size treated
*usually see at end of tx, take awhile to kick in
What are some pathologic (bad) effects of heat?
increases pain for some people
mottle erythema (blotchy)
fainting bc of bp change
What are some indications of heat stroke?
hot, red, dazed
body temp increases and keeps increasing (104-107)
rapid pulse (130-160)
respiratory rate increases
*drastically lower body temp immerse in cold water and elevate head
What are some indications of heat exhaustion?
cold and clammy
normal body temp or slightly below
intense thirst, fatigue, weakness, discomfort, anxiety or impaired judgement
cool pt gradually, shock position (flat with legs elevated), massage LEs to prevent venous pooling, fluid and salt replace gradually
What are 4 reasons why we use heat?
POST acute stage of traumatic conditions
increase ROM, elasticity, flexability
What are some contraindications of not using heat?
areas of decreased sensations/circulation
dvt (deep vein thrombosis)
What are some precautions of using heat?
metal in the area
What is a fever called?
What is prickly heat?
minor skin infection caused by ducts of acitive sweat glands
pinpoint sized lesions, prickly type itching
avoid by allowing to dry thoroughly after heat tx
What is a net decrease in body fluids when intake is insuffienct to compensate for fluid loss through sweat, urine, respiration, and feces?
normal fluid intake-2qts/day
What results from imbalance of electrolytes or water depletion?
sever cramps in extremities, abdomen
rest and gradual replacementof fluid balance with small amts of salt ...gatorade
What are types of superficial heat?
What are types of deep heat?
What are HPs filled with?
silica gel or betonite
What is the water temp of HP storage?
How long does it take for a HP to regain normal temp?
How many layer of terrycloth do you need between a HP and a pt?
What do you document after a HP?
condition skin pre and post
What is the temp of paraffin kept at?
47 to 54.4 c
113 to 122 f
What is the paraffin dip and wrap method?
dip 8-10 times, cover with plastic bag, wrap towel around, elevate
What is the paraffin dip and immerse method?
dip then reimmurse and keep in wax for entire treatment
What do you document after a paraffin treatment?
skin pre and post-color, integrity
timer-method of application