European journal of pain : EJP
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Randomized Controlled Trial
The effect of intradermal microdosing of a transient receptor potential cation channel subfamily V member 1 antagonist on heat evoked pain and thermal thresholds in normal and ultraviolet-C exposed skin in healthy volunteers.
Three TRPV1 (Transient Receptor Potential Vanilloid Receptor 1) antagonists were developed for testing in situ in human skin (Sjögren et al., 2016; Sjögren et al., 2018; Sjögren et al., 2018). The first human study using these compounds and capsaicin, was performed to determine the required local antagonist concentrations needed for target engagement (Proof of Mechanism, PoM) (Sjögren et al., 2018). In this paper, the aim was to address a TRPV1 antagonist's ability to inhibit a more complex pain signal and to define translational endpoints that could be used in further drug development, when progressing orally bioavailable TRPV1 antagonists as novel analgesic medications. ⋯ This study validated translational tools to confirm target engagement for TRPV1 antagonists; WDT, HPT and STHP have utility in this respect, after oral administration of a TRPV1 antagonist. This study also proved that TRPV1 antagonists can inhibit a more complex, non-capsaicin dependent thermally induced pain signal.
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Intramuscular injection of Nerve Growth Factor (NGF) may influence the responsiveness of active chemo-sensitive channels affecting muscle pain sensitivity. This double-blinded crossover study in healthy humans assessed contraction-evoked pain responses and pain sensitivity during acute ischaemia in the tibialis anterior (TA) muscle before and 24 hr after five distributed NGF injections (1 µg, 4 cm interval) compared with control injections (isotonic-saline). ⋯ Acidification of the muscle environment may affect muscle nociceptors and pain by different mechanisms, including activation of ASIC3 and TRPV1. In this study, pain evoked following ischaemic contractions was increased in the Nerve Growth Factor (NGF)-sensitized muscle compared with non-ischaemic contractions and in the non-sensitized muscle. These findings illustrate that responses of peripheral afferents under ischaemic conditions are altered by a pre-sensitized muscle. This highlights the role of growth factors, including NGF, in peripheral muscle sensitization with clinical implications for ischaemic myalgia.
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Randomized Controlled Trial
Exercise-induced hypoalgesia in young adult females with long-standing patellofemoral pain - A randomized crossover study.
Patellofemoral pain (PFP) is a common knee pain condition where hip and knee exercises help improve treatment outcomes. This study compared the acute effect of hip versus knee exercises on anti-nociceptive and pro-nociceptive mechanisms in young females with long-standing PFP. ⋯ A general hypoalgesic response to slowly increasing pressure stimuli was observed following both hip and knee exercises as well as decreased conditioned pain modulation, potentially indicating an attenuated ability from exercise to inhibit pain.
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Published guidelines promote best practice in complex regional pain syndrome (CRPS) treatment and management; however, these recommendations are not always applied in clinical practice. Understanding existing care internationally will help inform future patient and health professional service delivery, education initiatives and content of clinical guidelines. ⋯ Health professionals expressed some level of difficulty recognizing the signs and symptoms of CRPS despite the majority of health professionals having had clinical experience exceeding 6 years in the field of CRPS. More work is required to raise awareness amongst clinicians of the Budapest CRPS diagnostic criteria so as to promote early diagnosis and intervention Health professionals' treatment aims reflected the current clinical guidelines however, a lack of resources and fragmented care were frequently cited as barriers to achieving these.
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Self-medication is associated with an important utilization of Over-The-Counter (OTC) analgesics. The medical outcome resulting from therapeutic options bypassing the physician prescription is a major issue. In that context, pharmacists are expected to play a crucial role. The main objective of this review was to analyse the state-of-the art of pharmacists' role in pain management self-medication. ⋯ Analgesics are widely used without prescription, all over the world. They represent the largest market of OTC drugs, with an overall benefit/risk ratio favourable when appropriately used. Because of potential individual risks associated to the ailment or to the patient's behaviour, pharmacists' interventions have proven to optimize analgesic self-medication, provided that pharmacy staffs are both available and more specifically trained. In the future, in pain management, especially self-medication, pharmacists should play an increasing role and should be included in educational programmes and pain management guidelines.