Due to a shortness of time, the material in the following slides was not covered in class. I have tried to highlight the most important things and to add.

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Presentation transcript:

Due to a shortness of time, the material in the following slides was not covered in class. I have tried to highlight the most important things and to add some notes of explanation -Prof. Greenough

NEW TOPIC: PAIN ACUTE PERIPHERAL PAIN (You will get again in Neuro course) Epidermal Pain: c-fiber activation by intense physical stimulation Injurious tissue damage --> bradykinin (peptide), which in turn activates c-fibers c-fibers: small, unmyelinated somatosensory fibers that innervate epidermis, striated muscle, joints, etc. *most senstive to local anesthetics *interact with other sensory input to amplify pain sensation Opiate systems in spinal cord react to diminish this type of pain within a few minutes. This system subserves acute pain.

ACUTE PERIPHERAL PAIN Anti-opiates such as naloxone may increase pain, revealing effects of the body’s opiate systems. Placebo (“sugar pill”) administration may sometimes cause activation of opiate systems if subjects believe the pills are painkillers. Naloxone-sensitive pain reduction. Psychological activation of endogenous opiate systems. However, acute pain can modify central systems on a longer term basis. It is now commonly recommended that both peripheral “local” anesthetization and global anesthetic administration be used in conjunction with pain-inducing surgical procedures. Repetitious activation of C fibers builds up the electrical response of neurons to which they project in the spinal cord. This resembles LTP, a process thought to be involved in memory.

According to S. Siegel, an addict can take a dosage of heroin that would kill a person not used to it. But in fact, if the dosage is administered to the addict when he is unaware of it, it can kill the addict as well. Behavioral tolerance (to be described if time allows) suggests that conditioning affects the response to drugs. A rat can tolerate a larger dosage of an opiate if it is used to getting the opiate in a particular setting. Alternating injections, water and alcohol. Alcohol reduces body temperature. If all alcohol injections occur in one room and water injections in another, animals “defend” body temperature against alcohol. Addictions can also be dependent on context. Leaving an environment can leave drug addictions behind (e.g., Vietnam veterans). Reinstating environmental conditions can cause feelings of withdrawal. S. Siegel et al., Heroin overdose death: contribution of drug-associated environmental cues. Science, 216: 436-7, 1982

CHRONIC PAIN Chronic Pain: Basis is often much less clear. Incidence: more than 40% of the population will experience pain at some time in their lives. Chronic pain is not merely persistent acute pain. It may occur in the absence of obvious peripheral or visceral pathology. All pain has both sensory and affective-evaluative components. Focusing exclusively on either of these alone is equally misguided. With chronic pain there is not a linear relationship between nociception and pain experience. In chronic pain syndromes, there are qualitative differences in the affective-evaluative perception of pain. Prevalence of chronic pain increases with age

Sources of Chronic Pain Chronic Benign Pain: Any pain resulting from nonmalignant causes that is not allieviated by appropriate medical, pharmacotherapy, or surgical treatment. Example: Fibromyalgia, widespread aching, local tenderness, absence of laboratory evidence of inflammation. American College of Rheumatology defines as involving 3 or more segments of the body and at least 11 of 18 “tender points.” (e.g., trapezius, rib junctions, buttocks, knees) Steroids and NSAIDS have no more effect than placebo. (Placebos benefit 50% of patients, at least short-term.) Ketamine (NMDA receptor antagonist) appears to be effective in 50% of patients. Some think fibromyalgia is one extreme on a continuum of widespread chronic pain syndromes. Higher incidence in females. Opiates remain the most effective medications for managing chronic pain.

Behavioral Approaches to Chronic Pain Management It was historically thought that chronic pain patients exaggerated trivial pain problems--not made of “the right stuff.” This is not therapeutically helpful. Goal is restoration of functional life. Chronic pain can have secondary consequences: depressive illness, marital discord, job problems social withdrawal, sleep disorders. Biofeedback therapies combine feedback from detectors such as muscle EMG electrodes with techniques such as muscle relaxation to affect muscle function. Biofeedback can be effective for muscle contraction headaches, for symptoms of chronic stress such as anxiety, and for blood pressure disorders such as hypertension. Controlling pain behavior through operant conditioning and other behavioral approaches has also had success. The approach focuses upon modifying pain-related behavior separately from the treatment of the pain itself. Exercise and conditioning (e.g. stretching) is a very important mitigator of increased chronic pain with aging. Mild joint and limb pain is very common in sedentary (inactive) aging people.

Gate Control theory of Pain (Melzack): the interpretation of sensation as painful depends on the relative amounts of large fiber vs. small fiber (c-fiber) activity. Propose stimulating large fibers. Works for some pts, not all. Chronic treatment with normally addictive drugs such as opiates is not as addictive as expected if the withdrawal of the opiate accompanies mitigation of the pain due to recovery or some other form of treatment. The addictions are often context-dependent and, if the context, chronic pain, goes away, the addiction may do likewise. Pain increases in incidence in elderly. Physicians may dismiss as “just a part of growing old.” This is age discrimination and not appropriate. Physician should make every attempt to diagnose and treat the pain.