Biomedical subjects

John W Burns

Publications and source records attributed to John W Burns.

6 recordsLinked to original sources

PubMed2026

Relationships among mechanisms in psychosocial treatments for chronic pain: mechanism to mechanism lagged effects and relationships with outcomes.

Results suggest that psychosocial treatments for chronic pain work via several mechanisms, and that they often do so to similar degrees and in similar ways. Extant research, however, has focused on individual and/or independent effects of mechanisms on outcomes. Whether successful outcomes are also partly because of sequential and meaningful relationships among and between mechanisms-mechanism-to-mechanism effects-has not been examined. Secondary analyses were conducted of an RCT that compared cognitive therapy, mindfulness-based stress reduction, and behavior therapy to treatment as usual in a sample (N = 521) of people with chronic low back pain. Results of hierarchical linear modeling revealed that (1) Treatment Condition × Mechanism interactions predicting changes in other mechanisms were nonsignificant; (2) lagged prior session mechanism changes predicted next session changes in another mechanism; (3) lagged relationships between pain catastrophizing and pain self-efficacy were reciprocal, whereas links between lagged pain catastrophizing and mindfulness changes and lagged pain catastrophizing changes and behavioral activation changes were unidirectional; and (4) individual differences in the strengths of mechanism-to-mechanism relationships predicted pre- to post-treatment changes in outcomes. Results reveal heretofore hidden therapeutic processes that cognitive therapy, mindfulness-based stress reduction, and behavior therapy may share. Namely, that mechanism-to-mechanism lagged effects do indeed emerge beyond mechanism-to-outcome effects. Findings show not only that mechanisms may change in definable sequences relative to each other but that individual differences in the strengths of mechanism-to-mechanism relationships may themselves be predictive of outcomes.

Humans↗

PubMed2003

Pain anxiety among chronic pain patients: specific phobia or manifestation of anxiety sensitivity?

Rather than viewing anxiety among chronic pain patients as simply a component of negative affectivity, investigators have developed a model of "pain anxiety" in which patients develop fear and avoidance of activity linked to pain. We examined whether pain anxiety can be conceptualized as a specific phobia, or whether evidence supported the notion that pain anxiety is better understood as a manifestation of anxiety sensitivity in the context of chronic pain. Chronic musculoskeletal pain patients (N=70) underwent cold pressor and mental arithmetic tasks while cardiovascular, self-report, and behavior indexes were recorded. They completed measures of pain anxiety, anxiety sensitivity, fear of negative evaluation, depression and trait anxiety. Correlation analyses showed pain anxiety was related to pain-relevant responses during cold pressor, but it was also related to evaluation-relevant responses during cold pressor, and to pain- and evaluation-relevant responses (including subtraction accuracy) during mental arithmetic. Regression analyses showed that almost all effects of pain anxiety on task responses were accounted for by anxiety sensitivity. Fear of negative evaluation, in contrast, correlated only with evaluation-relevant responses, and mostly during mental arithmetic. These effects remained significant when depression, trait anxiety, or anxiety sensitivity were statistically controlled. Pain anxiety may be an expression of anxiety sensitivity rather than a circumscribed phobia; a distinction that could profitably guide treatment strategies.

Adult↗

PubMed2003

Do changes in cognitive factors influence outcome following multidisciplinary treatment for chronic pain? A cross-lagged panel analysis.

Changes in maladaptive cognitions may constitute therapeutic processes of multidisciplinary pain programs. A cross-lagged panel design was used to determine whether (a) early-treatment cognitive change predicted late-treatment outcome index change, but not vice versa; and (b) these effects remained significant with depression change controlled. Ninety chronic pain patients, in a 4-week multidisciplinary program, completed measures of catastrophizing, pain helplessness, depression, pain, interference, and activity level at pre-, mid-, and posttreatment. With depression changes controlled, early-treatment catastrophizing and pain helplessness changes predicted late-treatment outcome index changes, but not vice versa; early-treatment depression changes predicted late-treatment activity changes, but not vice versa. Findings advance understanding of pain treatment process and suggest that negative cognition changes may indeed affect improvements in treatment outcome.

Adaptation, Psychological↗

PubMed2002

Anger and pain sensitivity in chronic low back pain patients and pain-free controls: the role of endogenous opioids.

The experience of anger (i.e. trait anger) and anger management style (i.e. anger-in, anger-out) are related to sensitivity to acute and chronic pain stimuli, although underlying mechanisms are unknown. This study tested whether anger variables are associated with impaired endogenous opioid antinociceptive activity, and whether these relationships differed between chronic pain patients and healthy normals. Forty-three chronic low back pain (LBP) sufferers and 45 pain-free normals received opioid blockade (8 mg naloxone i.v.) or placebo blockade (saline) in randomized, counterbalanced order in separate sessions. During each session, subjects participated in a 1-min finger pressure pain task followed by an ischemic forearm pain task (maximum duration 5 min), providing pain intensity ratings during and immediately following each task. As a measure of opioid antinociceptive function, drug effects were derived by subtracting placebo from blockade condition pain ratings. Multivariate general linear model analyses indicated that anger-out, but not anger-in, had significant main effects on both finger pressure drug effects (P < 0.05) and ischemic task drug effects (P < 0.05). As hypothesized, high anger-out scores were associated with an absence of opioid analgesia during the acute pain tasks; low anger-out scores were associated with effective opioid analgesia. A similar non-significant trend was noted for trait anger on finger pressure drug effects (P < 0.06). Anger-out x LBP/normal interactions were non-significant, suggesting that links between anger-out and drug effects were similar for patients and normals. Controlling for depression did not eliminate the significant relationship between anger-out and drug effects. Findings suggest that anger-in and anger-out affect pain sensitivity through different mechanisms: only the effects of anger-out may be mediated by endogenous opioid dysfunction.

Acute Disease↗

PubMed1997

Cardiovascular reactivity to psychological stress may enhance subsequent pain sensitivity.

Stress-induced physiological reactivity has been shown to correlate with indexes of pain sensitivity, but it has not been demonstrated whether such reactivity can affect subsequent levels of pain threshold, tolerance and self-reported severity. The present study examined whether the degree of physiological reactivity (i.e., blood pressure and heart rate) elicited during an initial psychological stressor could be shown to influence indexes of pain sensitivity during subsequent pain induction. Fifty-two undergraduate men and women were assigned randomly to one of two conditions: perform mental arithmetic (MA) and then undergo a cold pressor task (CP; MA/CP) or vice versa (CP/MA). Subjects were divided into low/high mean arterial pressure (MAP) and low/high heart rate (HR) groups based on reactivity to MA. Principal analyses showed 'condition x MAP reactor group' interactions for pain threshold (F(1,48) = 7.38; P < 0.009) and tolerance (F(1,48) = 9.63; P < 0.003). Post hoc tests revealed that high MAP reactors in the MA/CP condition showed lower pain threshold and tolerance during CP than low MAP reactors in the same condition, while high and low MAP reactors in the CP/ MA condition did not differ. Thus, cardiovascular reactivity during psychological stress may contribute to increased sensitivity to subsequent painful stimulation.

Adolescent↗

PubMed1996

Anger management style, hostility and spouse responses: gender differences in predictors of adjustment among chronic pain patients.

This study examined whether relationships between anger management style (anger suppression; anger expression) and adjustment variables for patients with chronic pain depend on patient hostility, and/or depend on a patient's gender. A 'spouse response model' was also evaluated to test whether patient expression of hostile anger is linked to infrequent positive and frequent negative responses from spouses, and hence to poor adjustment. The sample of 127 married chronic pain patients was assessed prior to entry into a multidisciplinary pain treatment program. Hierarchical multiple regressions revealed significant 'Anger Expression x Hostility x Gender' interactions for pain severity, activity interference and activity level: High Anger Expressor/Low Hostile women reported the lowest pain and highest activity; Low Anger Expressor/High Hostile men reported the highest pain and highest interference. Among men, support was also found for a spouse response model: pain severity and activity interference for High Anger Expressors was partly accounted for by negative spouse responses. Results suggest that discriminations among patients may be made based on anger management style in interaction with level of hostile attitude and the patient's gender, and that these distinctions may have implications for understanding mechanisms of pain and disability, and for designing appropriate treatment.

Adaptation, Psychological↗