Thursday, March 31, 2016
Translating Genomic Advances to Physical Therapist Practice: A Closer Look at the Nature and Nurture of Common Diseases
The Human Genome Project and the International HapMap Project have yielded new understanding of the influence of the human genome on health and disease, advancing health care in significant ways. In personalized medicine, genetic factors are used to identify disease risk and tailor preventive and therapeutic regimens. Insight into the genetic bases of cellular processes is revealing the causes of disease and effects of exercise. Many diseases known to have a major lifestyle contribution are highly influenced by common genetic variants. Genetic variants are associated with increased risk for common diseases such as cardiovascular disease and osteoarthritis. Exercise response also is influenced by genetic factors. Knowledge of genetic factors can help clinicians better understand interindividual differences in disease presentation, pain experience, and exercise response. Family health history is an important genetic tool and encourages clinicians to consider the wider client-family unit. Clinicians in this new era need to be prepared to guide patients and their families on a variety of genomics-related concerns, including genetic testing and other ethical, legal, or social issues. Thus, it is essential that clinicians reconsider the role of genetics in the preservation of wellness and risk for disease to identify ways to best optimize fitness, health, or recovery. Clinicians with knowledge of the influence of genetic variants on health and disease will be uniquely positioned to institute individualized lifestyle interventions, thereby fulfilling roles in prevention and wellness. This article describes how discoveries in genomics are rapidly evolving the understanding of health and disease by highlighting 2 conditions: cardiovascular disease and osteoarthritis. Genetic factors related to exercise effects also are considered.
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Diagnostic utility of patient history and physical examination data to detect spondylolysis and spondylolisthesis in athletes with low back pain: A systematic review
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[Perspective] A brain conditioned for social defeat
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Wednesday, March 30, 2016
The effects of total knee replacement and non-surgical treatment on pain sensitization and clinical pain
Abstract
Background
The objective was to compare the effect of total knee replacement (TKR) followed by a 3-month non-surgical treatment with the non-surgical treatment alone in reducing pain sensitization and other pain-related measures in patients with knee osteoarthritis.
Methods
One hundred patients were randomized to (1) TKR followed by a non-surgical treatment of neuromuscular exercise, education, diet, insoles and pain medication or (2) the non-surgical treatment alone. Outcomes assessed at baseline and after 3 months were as follows: (1) pain sensitization assessed as pressure-pain thresholds (PPTs) at the knee (localized sensitization) and the lower leg (spreading sensitization), (2) peak pain intensity during the previous 24 h, (3) pain intensity after 30 min of walking, (4) pain location and pattern, (5) spreading of pain on a region-divided body chart and (6) the usage of pain medication.
Results
There was a statistical significant mean difference (95% CI) in change in PPTs from baseline to 3 months between groups in the crude analysis of 71 kPa (21–121) and of 75 kPa (33–117) when adjusting for baseline PPT, age, gender and body mass index, favouring the group having TKR. There were no significant between-group differences in change in the pain-related measures from baseline to 3 months (p = 0.15–0.27). Both groups improved in most of the pain-related measures (p < 0.05).
Conclusions
At 3 months, TKR followed by non-surgical treatment is more effective in reducing localized and spreading pain sensitization than non-surgical treatment alone. Both treatments are equally efficacious in reducing the pain-related measures of this study.
What does this study add?
- Knee replacement followed by non-surgical treatment is more effective in reducing pain sensitization, but not other pain-related measures, as compared to non-surgical treatment alone at 3 months.
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A randomized phase I trial evaluating the effects of inhaled 50–50% N2O–O2 on remifentanil-induced hyperalgesia and allodynia in human volunteers
Abstract
Background
Opioids are known to relieve pain, and also aggravate pre-existing hyperalgesia. In animal studies, the N-methyl-d-aspartate-receptor antagonist nitrous oxide (N2O) was able to prevent hyperalgesia. The present study evaluated the effect of N2O on hyperalgesia after remifentanil infusion in healthy volunteers.
Methods
Twenty-one healthy volunteers were enrolled in this placebo-controlled cross-over study. Transcutaneous electrical stimulation at high current densities induced spontaneous acute pain and stable areas of hyperalgesia. Each volunteer underwent the following four sessions: (1) 50–50% N2–O2 and i.v. saline; (2) 50–50% N2–O2 and i.v. remifentanil 0.1 μg/kg/min; (3) 50–50% N2O–O2 and i.v. saline; (4) 50–50% N2O–O2 and i.v. remifentanil 0.1 μg/kg/min. Inhaled gas mixtures lasted for 60 min, i.v. drug administration for 30 min. Visual analogue scale pain intensity, areas of pinprick hyperalgesia and touch-evoked allodynia were assessed repeatedly for 160 min.
Results
Data of 19 volunteers were analysed. There were significant time and treatment effects regarding areas of hyperalgesia and allodynia (p < 0.02). The area of hyperalgesia was significantly reduced in the N2O + remifentanil session compared to the remifentanil session (35.88 ± 22.37 vs. 43.55 ± 18.48 cm2, p = 0.004). The area of allodynia was significantly reduced in the N2O + remifentanil session compared to the remifentanil session (29.95 ± 16.15 vs. 34.80 ± 15.35 cm2, p = 0.008). The pain intensity was significantly reduced in the N2O + remifentanil session compared to the remifentanil session (37.96 ± 12.78 vs. 42.15 ± 13.34 mm, p < 0.0001).
Conclusions
Nitrous oxide significantly reduced hyperalgesia, allodynia and pain intensity aggravated after remifentanil administration in a human volunteer model.
What does this study add?
This study brings the evidence that N2O reduces the remifentanil aggravated secondary hyperalgesia in human volunteers exposed to a well-known model of electrical pain. N2O was able to oppose the hyperalgesia, the allodynia and the pain intensity consecutive to remifentanil use in this specific pain model.
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Effects of pregabalin on the nociceptive, emotional and cognitive manifestations of neuropathic pain in mice
Abstract
Background
Preclinical drug discovery for the treatment of chronic pain is at present challenged by the difficulty to study behaviours comparable to the complex human pain experience in animals. Several reports have demonstrated a frequent association of chronic pain in humans with affective disorders, such as anxiety and depression, and impaired cognitive functions, including memory and decision making, and motivation for goal-directed behaviours. In this study, we validated different behavioural outcomes to measure the emotional and cognitive manifestations of neuropathic pain induced in mice by partial sciatic nerve ligation.
Methods
In these mice, we evaluated at different time points the nociceptive responses, the anxiety- and depressive-like behaviours, the anhedonic state, object recognition memory and the operant responding maintained by food and the effects of the repeated administration of pregabalin on these manifestations.
Results
Our results demonstrated that the presence of allodynia and hyperalgesia in neuropathic pain mice was associated with increased anxiety- and depressive-like behaviours, reduced memory functions, development of an anhedonic state and impaired motivation to obtain food in the operant task. Chronic pregabalin treatment improved the nociceptive, anxiety-like and anhedonic responses, as well as the memory deficit, but did not modify the depressive-like alterations and the decreased motivation in these mice.
Conclusions
These results indicate that some emotional manifestations of chronic pain do not necessarily resolve when pain is relieved and underline the relevance to evaluate multiple behavioural responses associated with chronic pain, including the affective-motivational and cognitive behaviours, to increase the predictive value of preclinical drug discovery.
What does this study add?
- In this study, we have validated different behavioural outcomes allowing a reliable measurement of the emotional and cognitive manifestations of neuropathic pain induced in mice by partial sciatic nerve ligation.
- These results underline the relevance to evaluate these multiple pain-related alterations to improve the predictive value of preclinical drug discovery.
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Expectations of recovery: A prognostic factor in patients with neck pain undergoing manual therapy treatment
Abstract
Background
Expectations have been investigated in populations seeking care for neck pain, however not considering potential confounding factors. The aim of this study was to investigate if pretreatment expectations of recovery is a prognostic factor for recovery from neck pain at 7 weeks follow-up in patients seeking manual therapy treatment.
Method
The study was based on the Stockholm Manual Intervention Trial, a randomized controlled trial investigating efficiency of three combinations of manual therapy. The patients with neck pain were included in this study (n = 716).
Expectations of recovery was measured at baseline; ‘How likely is it, according to your judgment, that you are completely recovered from your neck/back problems in 7 weeks’. Patients answered on a 11-point scale, further categorized into low, moderate and high expectations. The outcome was measured at 7 weeks follow-up by a modified version of the Global Perceived Recovery Question. Potential effect measure modifiers and confounders were measured at baseline. Multivariable log binomial regression models were used to analyse the association between expectations and recovery, presented as relative risks and 95% confidence intervals (CI).
Results
High expectations of recovery yielded a 47% increased probability of being recovered at 7 weeks follow-up. High expectations of recovery yielded improved recovery in both men and women separately, but moderate expectations yielded improved recovery only among men.
Conclusion
Our results suggest that expectations of recovery is a prognostic factor for recovery in patients with neck pain seeking manual therapy treatment.
What does this study add?
We found that high expectations of recovery yielded a higher probability of recovery compared to having low expectations, also when considering potential confounding factors. Expectations seemed to have a more distinct influence on recovery among men.
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Involvement of transient receptor potential A1 channel in algesic and analgesic actions of the organic compound limonene
Abstract
Background
TRPA1 is a Ca-permeable nonselective cation channel expressed in sensory neurons and acts as a nocisensor. Recent reports show that some monoterpenes, a group of naturally occurring organic compounds, modulate TRP channel activity. Here, we report that limonene, being contained in citrus fruits and mushrooms, shows a unique bimodal action on TRPA1 channel.
Methods
We examine the effects of limonene on sensory neurons from wild-type, TRPV1- and TRPA1-gene-deficient mice and on heterologously expressed channels in vitro. Molecular determinants were identified with using mutated channels. Cellular excitability is monitored with ratiometric Ca imaging. Nociceptive and analgesic actions of limonene are also examined in vivo.
Results
In wild-type mouse sensory neurons, limonene increased the intracellular Ca2+ concentration ([Ca2+]i), which was inhibited by selective inhibitors of TRPA1 but not TRPV1. Limonene-responsive neurons highly corresponded to TRPA1 agonist-sensitive ones. Limonene failed to stimulate sensory neurons from the TRPA1 (−/−) mouse. Heterologously expressed mouse TRPA1 was activated by limonene. Intraplantar injection of limonene elicited acute pain, which was significantly less in TRPA1 (−/−) mice. Systemic administration of limonene reduced nociceptive behaviours evoked by H2O2. In both heterologously and endogenously expressed TRPA1, a low concentration of limonene significantly inhibited H2O2-induced TRPA1 activation. TRPA1 activation by limonene was abolished in H2O2-insensitive cysteine-mutated channels.
Conclusions
Topically applied limonene stimulates TRPA1, resulting in elicitation of acute pain, but its systemic application inhibits nociception induced by oxidative stress. Because limonene is a safe compound, it may be utilized for pain control due to its inhibition of TRPA1 channels.
What does this study add: Limonene, a monoterpene in essential oils of various plants, has been known for its antitumor and anti-inflammatory properties. However, molecular basis of their actions has not been identified. This study shows that limonene activates nociceptive TRPA1 and elicits acute pain, when it is topically applied. In addition, systemic application of limonene exerts inhibitory effects on nociception induced by an oxidative stress-induced TRPA1 activation.
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Enhanced c-Fos expression in the central amygdala correlates with increased thigmotaxis in rats with peripheral nerve injury
Abstract
Background
Pain is associated with affective, cognitive and sensory dysfunction. Animal models can be used to observe ethologically relevant behaviours such as thigmotaxis, giving insight into how ongoing sensory abnormalities influence natural rodent behaviours. The amygdala is a complex group of nuclei implicated in the integration and generation of emotional behavioural responses, including those associated with pain, and a region known as the central amygdala is particularly associated with generation of behavioural responses, due to its links to the descending pain modulation pathways; as such, study of amygdalar c-Fos immunoreactivity can help identify the neuronal circuits involved.
Method
This study investigated changes in both nociceptive evoked responses and open field behaviour following spinal nerve transection (SNT) in male Wistar rats, and attempted to correlate these with changes in central amygdala c-Fos immunoreactivity.
Results
Fourteen days after SNT, mechanical hypersensitivity was present in the hind paw ipsilateral to site of injury. Thigmotactic behaviour was significantly increased in both SNT and sham surgery animals, with c-Fos immunoreactivity in the central amygdala significantly greater in SNT animals compared to both sham and naive groups. Activation was greatest in the capsular and lateral subnuclei of the central amygdala, and in the caudal-most regions. There was a strong correlation between thigmotactic behaviour and central amygdala activation following SNT surgery not seen in sham animals suggesting a role for the amygdala in behavioural responses to peripheral nerve injury.
Conclusions
This study provides evidence to support the role of the amygdala in thigmotactic open field behaviour following SNT.
What does this study add?
Thigmotaxis and amygdala activation are positively correlated in rats following spinal nerve transection.
Behavioural changes seen in sham animals did not correlate with amygdala activation, suggesting amygdala activation is related to nociceptive input.
Evoked measures, such as hindpaw withdrawal, are not correlated with either thigmotaxis or amygdala activation, emphasizing the importance of complex behaviours when studying pain.
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Corrigendum to ‘Implementation fidelity of physiotherapist-delivered group education and exercise interventions to promote self-management in people with osteoarthritis and chronic low back pain: A rapid review Part II*’ [Manual Therapy 20/2 (2014) 1–8]
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Dosing of opioids and other stories . . .
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Tuesday, March 29, 2016
Qigong or Yoga versus no intervention in older adults with chronic low back pain – a randomized controlled trial
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Pain at the back of the heel
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Friday, March 25, 2016
Changes over time of prescription and non-prescription analgesics for headache with or without other somatic pain Effects of prescription regulatory changes
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Association between the 10 item Örebro musculoskeletal pain screening questionnaire and physiotherapists’ perception of the contribution of biopsychosocial factors in patients with musculoskeletal pain
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Rotator cuff related shoulder pain: Assessment, management and uncertainties
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Response to Letter to the Editor Re: “Effect of education on non-specific neck and low back pain: a meta-analysis of randomized controlled trials”
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Thursday, March 24, 2016
Association of levels of opioid use with pain and activity interference among patients initiating chronic opioid therapy: a longitudinal study
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Differences in demographic, clinical, and symptom characteristics and quality of life outcomes among oncology patients with different types of pain
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Upregulation of the sodium channel NaVβ4 subunit and its contributions to mechanical hypersensitivity and neuronal hyperexcitability in a rat model of radicular pain induced by local dorsal root ganglion inflammation
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Sleep problems and pain: a longitudinal cohort study in emerging adults
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[Correspondence] Inappropriate use of antibiotics in children in China
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The Behavioral Activation and Inhibition Systems: Implications for Understanding and Treating Chronic Pain
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Wednesday, March 23, 2016
Letter to the Editor: ‘Effect of education on non-specific neck and low back pain: A meta-analysis of randomized controlled trials’
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Rheumatoid arthritis
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Tuesday, March 22, 2016
Mind-Body Approaches for Chronic Low Back Pain
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Mindfulness-Based Stress Reduction vs Cognitive Behavioral Therapy
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A woman with abdominal distension and pain
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Monday, March 21, 2016
Obesity in early adulthood predicts knee pain and walking difficulties among men: A life course study
Abstract
Background
Few studies have addressed the role of obesity in young adulthood in knee problems later in life. We assessed the associations of overweight/obesity with knee pain and functional limitations of the knee across the life course.
Methods
Military health records from 1967 to 2000 (baseline) were searched for 18- to 50-year-old Finnish men (n = 1913) who participated in the Health 2000 Study (follow-up). Visits to health care were followed during service. Height and weight were measured at baseline and follow-up and waist circumference at follow-up. Weight was inquired at follow-up for ages of 20, 30, 40 and 50 years, if applicable. Life course body mass index (BMI) was calculated. One-month knee pain and functional limitations (walking difficulties and limping) due to knee problems were enquired with interview at follow-up. Cox regression model, logistic regression and trajectory analysis were applied.
Results
Body mass index at the age of 20 increased the risk of unilateral knee pain by 38% and functional limitations by 27% for one standard deviation increment of BMI, respectively. One-unit increment of Z-score of life course BMI increased knee pain by 32%. Development of severe obesity during the follow-up increased the risk of knee pain by 80% and functional limitations by 93%. The effect of obesity on functional limitations was partly mediated by traumatic knee problems during military service.
Conclusions
Reducing overweight already in adolescence and avoiding further weight gain during life course may prevent knee pain and associated disability.
What does this study add?
BMI at the age of 20 increases the likelihood of knee pain and functional limitations of the knee later in life.
Development of severe obesity in adulthood increases the risk of knee pain by 80% and functional limitations by more than 90%.
Both general and abdominal obesity are associated with knee pain, associations being stronger for general obesity.
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Sensorimotor dysfunction after limb fracture – An exploratory study
Abstract
Background
Chronic pain is often associated with sensorimotor dysfunction but little is known about the early impact of limb fracture on sensory and motor performance. This exploratory study sought to assess these changes in patients with recent wrist and ankle fractures. A secondary aim was to determine the incidence of Complex Regional Pain Syndrome (CRPS) and its clinical features.
Methods
Fifty-three patients at a UK fracture centre underwent Quantitative Sensory Testing (QST), Motor Imagery (MI) and Body Perception Disturbance (BPD) assessments ≤5 weeks post-fracture (Time 1). Subjective evaluation of recovery and clinical examination for CRPS was conducted 5 weeks later (Time 2, 50 patients). Patient-reported outcomes of pain, psychological distress and limb function were collected at Times 1 and 2, and 6 months after T1 (Time 3, 36 patients, postal questionnaire).
Results
Quantitative sensory testing at Time 1 demonstrated cold and pressure-pain hyperalgesia in the fractured limb compared to the non-fractured side (p < 0.05). Imagined movements were reported as significantly more difficult to perform on the fractured side (p < 0.001). There was evidence of BPD in the fractured limb, similar to that found in CRPS. The incidence of CRPS was 9.4%; however, individual signs and symptoms of the condition were commonly present (70% reported ≥ one symptom). Only 33% of patients reported to being ‘back to normal’ 6 months after fracture with 34% reporting ongoing pain.
Conclusions
Limb fracture is associated with changes in pain perceptions, motor planning, and disruption to body perception. Signs and symptoms of CRPS, ongoing pain and delayed recovery post-fracture are common.
What does this study add?
In the immediate post-fracture period: Body perception disturbance is reported in the fractured limb. Imagined movements of the fractured limb are less vivid and associated with pain
This study contributes to the incidence literature on CRPS.
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Saturday, March 19, 2016
Medical cannabis associated with decreased opiate medication use in retrospective cross-sectional survey of chronic pain patients
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Friday, March 18, 2016
Doctors are urged to limit opioid prescribing
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