Midterm Flashcards
What is the goal for a modalities during the inflammatory stage?
-Reduce blood flow and decrease cellular metabolism to lessen the formation of edema
What is the goal of a modality during the proliferation stage?
-enhance blood flow and cellular activity
What is the goal of a modality during the maturation phase?
-facilitate collagen maturation and organization
What type of pain receptors respond to high intensity mechanical and thermal stimuli and conduct the signal very quickly to create a withdrawl response?
-A delta fibers
what pain receptors condunt more slowly, and are related to dull or achy pains?
-C fibers
What type of neurons are nociceptor specific?
-High threshhold fibers
What type of neurons receive input from nociceptors and other afferent fibers?
-Wide dynamic
What is increased responsiveness to noxious stimuli and non-noxious stimuli, increased receptive field and decreased activation threshold?
-Central sensitization
What is the most commonly used theory to explain pain inhibition using modalities?
-The Gate control theory
What does the gate control theory propose?
-that stimulation of large diameter A beta fibers activate local inhibitory circuits in the dorsal horn of the SC, thereby preventing nociceptive input from reaching the brain
What two modalities are thought to stimulate A beta fibers?
-ESTIM and superficial heat
What does central inhibition propose?
-the pain is modulated by the activation of descending inhibitory pathways projecting into the spinal cord
When applying a modality to a patient in the acute stage what position should they be in?
-The most comfortable position (loose pack)
What is the transfer of heat by the direct interaction of the molecules?
-conduction
How can you facilitate conduction?
-add pressure
What is the transfer of heat caused by the movement of air of water molecules?
-convection
What is the transfer of heat due to the evaporation of liquid into a gas?
-Evaporation
What is the transfer of heat via electromagnetic waves?
-thermal radiation
As the temperature gradient increases, what happens to the cooling effect?
-it increases
What is the main effect of cryotherapy?
-it decreases blood flow
How does cryotherapy cause blood flow to decrease?
-it causes vasoconstriction of cutaneous blood floow and reduces vasodilating transmitters
At what tempurate will there be a reflexive cyclical vasodilation/constriction response?
-50 degrees
Lower tissue tempuratures also decrease what?
-metabolic rate and oxygen demand (prevent hypoxia_
What does cryotherapy do to nerve conduction?
-slows it
How does cryotherapy decrease spacticity?
-it results in a reflexive decrease in gamma-motor neuron activity, and decreases muscle spindle discharge
What effect does cryotherapy have on strength?
-it decreases it after only 10 minutes of cold exposure (MMT grades my not be reliable)
What effect does cryoptherapy have on joint proprioception?
-it decreases it (be aware of activity after)
What temperatures should a conventional cold pack be?
-below 32 degrees
How long can you apply a cold pack?
-twenty to thirty minutes
What type of cryotherapy is good to use on small areas?
-ice massage
how long should you apply an ice massage?
-10 minutes
What temperature should whirlpools be if used on a distal extremity?
-50-65 degrees
What temperature should a whirlpool be is used on the whole body?
-65 to 80 degrees
How long should an ice bath/whirl pool be applied?
-10 to 20 minutes
What is the order of sensations a patient will feel with cryotherapy?
-CBAN (cold, burning, aching, numbness)
How does compression improve edema?
-It increases the tissue hydrostatic gradient that is thought to favor edema
50% pull and 50% overlap of an elastic wrap can create pressures of what?
-40 to 50 mmHg
Intermittent compression devices create pressures of what?
-30 to 75 mmHg
what pressure is neccesary to be above capillary pressure and encourage the absorption of edema?
-30 mmHg
What is the main reason to use superficial heat as a modality?
-to increase tissue extinsibility
What temps should be used for vigorous heating?
-104 to 113 deg
applying heat to a large amount of tissue can cause what systemic effects?
-increased HR, BP and pulmonary alterations
What type of heat particulary notes cutaneous vasodilation?
-moist heat
What does superficial heat block pain?
-by the gate control theory, and alter nerve conduction