4---2 Numbness, Tingling, Sensory Loss Flashcards
Usually result from trains of impulses generated at sites with lowered threshold or heightened excitability at peripheral or central
Positive phenomena
Prototypical positive sx
Tingling ( pins and needles)
Nature and severity depends on
Number
Rate
Timing and distribution;
Type and function of nerve
True or false? + phenomena are not associates w sensory loss on exam
True
If the rate of loss is slow?
Lack of cutaneous feeling may be unnoticed
If rapid loss?
Both positive and negative phenomena are consoicous
T or f? Sensory signs on exam are always a measure of negative phenomena
T
Typically refers to tingling or pins and needles
Paresthesia
Denotes all types of abnormal sensations, including painful ones
Dyesthesia
Complete absence of skin sensation includinf pinprick
An esthesia
Reduced/absent pain perception
Hypalgesia / an algesia
Encompasses all phenomena described by hyperesthesia, allodynia, hyperalgesia
Hyperpathia
Sensory ataxia refer collectively to
Clumsiness, unsteadiness, imbalance
Continuous involuntary movts
Paeudoathtosis
Naked nerve endinfgs
Nociceptors & thermoceptors