Pain and the Patient Experience

Total Page:16

File Type:pdf, Size:1020Kb

Pain and the Patient Experience PAIN EXPERIENCE 76 Pain and the Patient Experience Susan E. Mazer Fellow at the Institute for Social Innovation at Fielding Graduate University – Santa Barbara, California Corresponding Autor: Susan E. Mazer, Ph.D. E-Mail Address: [email protected] Abstract With the continuing opioid epidemic, there is an urgent call for alternatives to narcotics and other addictive medications. Historically, pain theories have moved through the many stages of medicine, predating the scientific method and following through past Descartes declaration that the mind and the body do not influence each other. This article reviews pain theories and practices moving into the era of the Patient Experience, multi-modal strategies for mitigating suffering, and the impact of the patient’s environment and social/cultural milieu informing and supporting the patient’s own capacity to cope and manage pain. Methods: A broad review was done of studies and critiques that bring together the historic and current attitudes and beliefs about pain, social-ethnic-racial assumptions, to evaluate the state of pain management as medication-driven solutions begin to fail as first options. In addition, the dominant role of mean-making and caregiver beliefs is discussed as they become more relevant in seeking alternatives to opioids. Conclusion: I). The debate regarding what exactly pain is continues to be between the physical or biochemical domain and the mental-emotional- cognitive domain that brings meaning to the experience. II) The Patient Experience of pain is lived rather than theorized, and is known fully only by the patient and is a private experience informed by the unique circumstances and history of each patient. III) The merging of neurological and psychological factors in pain management is well documented but not optimized in strategizing effective pain control methods. IV) Additional studies are needed to better understand the balance between psychological-social-and-clinical factors to arrive at more effective strategic processes in pain reduction. Keywords: patient experience, pain management, placebo and nocebo response, the meaning response, biopsychosocial factors in pain management, distraction therapy REVIEW PAIN EXPERIENCE 77 Introduction patients’ coping skills. More than medication, the emotional and cognitive Today, in the 21st Century, pain power of perception and meaning making remains as much a human mystery as it did together with directed attention, becomes when the ancient Greek philosopher the mechanism for patients to actively Aristotle proclaimed that pain was not participate in their own pain management. physical, but emotional. It is such a deeply private experience, that language is often The Meaning Response inadequate in being able to accurately describe pain. Even physiologist Max von Melzack and Wall (1965) first Frey’s detailed Specificity Theory, which identified the role of meaning in the hypothesized in 1895 that every organ has experience of pain. However, in recent its own pain cue and every pain can be years, the issue of patient perception has assigned to a place on the human body, taken a prominent place in the literature. made it no easier for caregivers to figure out Traced to neurological activity, this has put how to relieve suffering (Moayedi & Davis, the focus on the whole patient in terms of 2012). physical, emotional, mental, and cognitive capacity. The meaning response, often Since the advancement of referred to as the placebo effect, provides a pharmacological pain relief, the use of real-time example of the role of belief and drugs has become the overwhelming meaning. Medical anthropologist Daniel preference for pain management. However, Moerman (2002) points to the meaning the challenge of understanding and response as physiologic or psychological prescribing alternative to opioids, including effects of meaning in the origins, treatment, complimentary therapies, has yet to be fully and recovery of illness (2002). He also calls integrated into practice in the U.S. and the meaning response an autonomous many parts of the world. Right now, response, one generated within and by the “alternative” tends to translate into lower or patient’s own powers to heal. The role of controlled dosage, which is not always placebo, which is traditionally used as a effective for what patients need. In their sham inert medical substance presented to a effort to understand pain mechanisms, patient as an actual medication to cure or psychologist Ronald Melzack and treat some condition. Randomized control neuroscientist Patrick Wall (1965) trials have been the primary users of observed that some patients with little placebos. However, the question was injury suffered from extraordinary pain and limited to whether the testing medication others with extensive damage suffered would prove more effective than subjective little. This led to the Gate Control Theory, expectations of the patient (Johnson, 2005). where patients’ capacities to modulate their According to Colloca and Grillon (2014) pain were based on their experience as well Placebo analgesia relieves pain “simply by as genetic makeup. Shortly thereafter, virtue of the anticipation of a benefit.” A Melzack with Kenneth Casey (1969) review of clinical trials using a placebo expanded Gate Control Theory to identify (Meissner et al., 2007) suggest that three distinct factors in the experience of placebos mimic the action of active pain. These include the somatic, or treatments and effect measurable change in sensation of pain, the perception of health status, not merely symptoms. Social pleasantness or unpleasantness (which can support and observational learning also lead to the fight or flight response), lead to analgesic effects. This is not to followed by “appraisal, cultural values, imply that acute or severe pain does not context, and cognitive state.” These steps require medication for relief. Rather, it influence each other and, together, motivate suggests that the patient’s mind can REVIEW PAIN EXPERIENCE 78 modulate the pain and increase (or medication use, and prognosis in dealing decrease) the effectiveness and needed with chronic pain. There is not enough dosage using methods that are not evidence to determine sex-specific pain pharmaceutical. Patients’ pain is their protocols, but considerations for gender reality, defined not by their diagnosis or along with other cultural issues will prognosis, but rather their experience. improve outcomes (Cepeda et al., 2003). Furthermore, the visceral nature of pain The existing conflict between women takes on the meaning the patient imparts to (especially ethnic minorities and the it in the moment. A positive response to a elderly) who report pain, and male placebo is not caused by the substance, but physicians who do not take them seriously, rather is generated by the patient’s own has yet to be openly acknowledged or belief, experience, and expectations. In resolved. The American Society of addition, it is the support and Anesthesiologists reported (2015) that encouragement of the caregivers, including women are more likely to experience more physicians and others, that enhance the pain than men. However, they are reluctant effectiveness of all treatments, including to report it and they are often ignored or those related to patients’ powers to heal. A dismissed. Lovering (2006), in a 2015 study published in the journal Pain collaborative study on cultural beliefs and indicated that between 1990 and 2013, the practices that involved woman from placebo effect was shown to increase while different cultures of birth and heritage, the effectiveness of drugs had diminished, found that the gap between how patients putting into question whether respond to pain, the willingness to report pharmaceutical solutions are the best their pain, and the beliefs of the solution for pain (Tuttle et al., 2015). nurse/physician had profound influence on whether pain was actually relieved. Hidden Factors of Culture and Gender Anthropologist Mark Zborowski (1952) posited that social and cultural The inequality that exists in pain influences determine what he called “pain treatment between white, middle-income expectancy” and “pain acceptance.” Pain patients and those belonging to ethnic expectancy sets up a patient to perceive minorities, such as Hispanics and Asians, both avoidable and unavoidable pain. Pain has been well acknowledged (Mossey, acceptance is about the inevitable, 2011). The reasons behind this discrepancy something that people must deal with as a are complex. However, social and ethnic result of their own behaviors or cultural influences may inform patients’ willingness mandates. For example, some women opt to report pain, request help or medication, for natural childbirth as a social or religious and ultimately, make public any level of rite of passage, while others choose discomfort. medication. Aside from expectations and Gender differences also play a acceptance, however, there is pain significant role in determining the apprehension and pain anxiety, both of perception and expectations around pain, as which impact the character of the pain, such well as the effectiveness of pain as its intensity, duration, quality of management. Greenspan et al. (2007) sensation, and the emotional response of concluded that, “psychological and social the patient (Zborowski, 1952). variables powerfully influence pain and can often explain more the variance associated The Patient Environment is the Patient with pain than do biological
Recommended publications
  • The Open Pain Journal, 2017, 10, 44-55 the Open Pain Journal
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Leeds Beckett Repository Send Orders for Reprints to [email protected] 44 The Open Pain Journal, 2017, 10, 44-55 The Open Pain Journal Content list available at: www.benthamopen.com/TOPAINJ/ DOI: 10.2174/1876386301710010044 REVIEW ARTICLE Effect of Age, Sex and Gender on Pain Sensitivity: A Narrative Review Hanan G. Eltumi1,2 and Osama A. Tashani1,2,* 1Centre for Pain Research, School of Clinical and Applied Sciences Leeds Beckett University, Leeds, UK. 2Department of Physiology, Faculty of medicine, University of Benghazi, Libya. Received: February 05, 2017 Revised: May 23, 2017 Accepted: May 26, 2017 Abstract: Introduction: An increasing body of literature on sex and gender differences in pain sensitivity has been accumulated in recent years. There is also evidence from epidemiological research that painful conditions are more prevalent in older people. The aim of this narrative review is to critically appraise the relevant literature investigating the presence of age and sex differences in clinical and experimental pain conditions. Methods: A scoping search of the literature identifying relevant peer reviewed articles was conducted on May 2016. Information and evidence from the key articles were narratively described and data was quantitatively synthesised to identify gaps of knowledge in the research literature concerning age and sex differences in pain responses. Results: This critical appraisal of the literature suggests that the results of the experimental and clinical studies regarding age and sex differences in pain contain some contradictions as far as age differences in pain are concerned.
    [Show full text]
  • Estrogenic Influences in Pain Processing
    Estrogenic influences in pain processing Asa Amandusson and Anders Blomqvist Linköping University Post Print N.B.: When citing this work, cite the original article. Original Publication: Asa Amandusson and Anders Blomqvist, Estrogenic influences in pain processing, 2013, Frontiers in neuroendocrinology (Print), (34), 4, 329-349. http://dx.doi.org/10.1016/j.yfrne.2013.06.001 Copyright: Elsevier http://www.elsevier.com/ Postprint available at: Linköping University Electronic Press http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-100488 Estrogenic Influences in Pain Processing Åsa Amandussona and Anders Blomqvistb aDepartment of Clinical Neurophysiology, Uppsala University, 751 85 Uppsala, Sweden, and bDepartment of Clinical and Experimental Medicine, Division of Cell Biology, Faculty of Health Sciences, Linköping University, 581 85 Linköping, Sweden. Correspondence to: Dr. Åsa Amandusson, E-mail: [email protected], or Dr. Anders Blomqvist, E-mail: [email protected] Amandusson & Blomqvist, page #2 Abstract Gonadal hormones not only play a pivotal role in reproductive behavior and sexual differentiation, they also contribute to thermoregulation, feeding, memory, neuronal survival, and the perception of somatosensory stimuli. Numerous studies on both animals and human subjects have also demonstrated the potential effects of gonadal hormones, such as estrogens, on pain transmission. These effects most likely involve multiple neuroanatomical circuits as well as diverse neurochemical systems and they therefore need to be evaluated specifically to determine the localization and intrinsic characteristics of the neurons engaged. The aim of this review is to summarize the morphological as well as biochemical evidence in support for gonadal hormone modulation of nociceptive processing, with particular focus on estrogens and spinal cord mechanisms.
    [Show full text]
  • Pain Management & C.A.R.E.®
    Creating Environments that Heal Pain Management & C.A.R.E.® By Susan E. Mazer, Ph.D President & CEO Healing HealthCare Systems, Inc. ABSTRACT Pain management has reached the apex of conflict between what patients have a right to expect and how physicians balance safe pain relief with suffering. With the Opioid Epidemic being attributed in part to the over-prescribing by physicians, the push to find alternatives is greater now than in the past. However, there is little understanding about the experience and mechanisms of pain and its management. This paper provides an overview of the history of pain theories and their relationship to patients’ empowerment in managing their conditions. The dictum that pain is not a disease, but rather a symptom, allows for broader understanding and exploration on a per patient basis. Theories that inform pain management practices, such as Focused Attention, Attention Restoration, and Restorative Environments are also reviewed. In addition, research that points to the patient’s pain beliefs, attitudes, and emotional state informing their capacity to self-regulate pain and the effectiveness of pain management strategies is discussed. The C.A.R.E. Channel and C.A.R.E. with Guided Imagery are discussed in the context of current pain management practices and creating an environment of care that is, itself, a means of mitigating pain. This includes concerns about comfort and self-management of pain that extend beyond hospitalization. CREATING ENVIRONMENTS THAT HEAL | WWW.HEALINGHEALTH.COM Page 1 Pain Management & C.A.R.E. By Susan E. Mazer, Ph.D President & CEO Healing HealthCare Systems, Inc.
    [Show full text]
  • PDF (Thesis Document)
    The experience of pain in the context of childbirth for Hong Kong Chinese women: a longitudinal cohort interview study Lee Lai Yin, Irene A thesis submitted in partial fulfillment for the requirements for the degree of Doctor of Philosophy at the University of Central Lancashire. July 2017 1 Student Declaration I declare that while registered as a candidate for the research degree, I have not been a registered candidate or enrolled student for another award of the University or other academic or professional institution. I declare that no material contained in the thesis has been used in any other submission for an academic award and is solely my own work. Signature of Candidate: Type of Award: Doctor of Philosophy School of Community Health and Midwifery 2 Abstract Childbirth, the biggest life event for a woman, is a complicated process. Childbirth pain not only involves physiological sensations, but also psychosocial and cultural factors. In addition, the way the woman handles the pain is affected by the meaning she attributes to it. In order to understand the experience of Hong Kong Chinese women in terms of childbirth in general and childbirth pain in particular, and to learn the meanings attributed, a longitudinal qualitative descriptive study was conducted with the aim of exploring the experience and meaning of pain in the context of childbirth for Hong Kong Chinese women. The study was informed by a systematic review and metasynthesis of existing relevant literature. Since people’s attitudes, beliefs and behaviours may change over a period of time, data were collected from the participants at 4 different time points: around 36 weeks of pregnancy; on postnatal day 3; 6-7 weeks after birth; and 10-12 months after birth.
    [Show full text]
  • Inhibition of Autotaxin Activity Ameliorates Neuropathic Pain
    www.nature.com/scientificreports OPEN Inhibition of autotaxin activity ameliorates neuropathic pain derived from lumbar spinal canal stenosis Baasanjav Uranbileg1, Nobuko Ito2*, Makoto Kurano1, Kuniyuki Kano3, Kanji Uchida2, Masahiko Sumitani4, Junken Aoki3 & Yutaka Yatomi1 Lumbar spinal canal stenosis (LSS) or mechanical compression of dorsal root ganglion (DRG) is one of the causes of low back pain and neuropathic pain (NP). Lysophosphatidic acid (LPA) is a potent bioactive lipid mediator that is produced mainly from lysophosphatidylcholine (LPC) via autotaxin (ATX) and is known to induce NP via LPA1 receptor signaling in mice. Recently, we demonstrated that LPC and LPA were higher in cerebrospinal fuid (CSF) of patients with LSS. Based on the possible potential efcacy of the ATX inhibitor for NP treatment, we used an NP model with compression of DRG (CD model) and investigated LPA dynamics and whether ATX inhibition could ameliorate NP symptoms, using an orally available ATX inhibitor (ONO-8430506) at a dose of 30 mg/kg. In CD model, we observed increased LPC and LPA levels in CSF, and decreased threshold of the pain which were ameliorated by oral administration of the ATX inhibitor with decreased microglia and astrocyte populations at the site of the spinal dorsal horn projecting from injured DRG. These results suggested possible efcacy of ATX inhibitor for the treatment of NP caused by spinal nerve root compression and involvement of the ATX-LPA axis in the mechanism of NP induction. Neuropathic pain (NP) is characterized by abnormal pain symptoms such as hyperalgesia and allodynia and is caused by damage to the peripheral or central nervous system 1,2.
    [Show full text]
  • Detection of Central Sensitization in Chronic Pain Patients Visiting the Outpatient Pain Clinic of St
    MSc thesis in Technical Medicine Detection of Central Sensitization in Chronic Pain Patients Visiting the Outpatient Pain Clinic Of St. Antonius Hospital Lieke Petter November 2018 DETECTIONOFCENTRALSENSITIZATIONINCHRONICPAIN PATIENTSVISITINGTHEOUTPATIENTPAINCLINICOFTHE ST.ANTONIUSHOSPITAL A thesis submitted to the University of Twente in partial fulfillment of the requirements for the degree of Master of Science in Technical Medicine by Lieke Petter November 2018 Commitee: Prof.dr.ir. M.J.A.M. van Putten dr.ir. J.R. Buitenweg Drs. I.P. Krabbenbos drs. R.J. Haarman ABSTRACTIn the Netherlands, 18% of the adults suffer from chronic pain. Chronic pain is not only a burden to the quality of life of the patient, it is also a burden to society due to increased use of medical facilities, and social compensations. The underlying mechanism that is maintaining the pain is thought to be a result of neuroplastic changes in the central nerve system, a phenomenon called central sensitization. In this phenomenon, long-lasting, intense stimuli cause an alteration in the nociceptive pathway, lead- ing to a persistent state of high sensitivity. Detection and monitoring of central sensitization would provide information about the patients nociceptive system that could enable mechanism-based ther- apy. Unfortunately, appropriate diagnostic tests to monitor patients with signs of central sensitization are not available in current clinical practice. The aim of this thesis was to set-up a process for the outpatient pain clinic in St. Antonius Hospital for the detection of central sensitization in chronic pain patients with electrical Quantitative Sensory Testing (eQST). This monitoring process was designed, based on current clinical practice in which opportunities for data collection were mapped, existing out of three different phases.
    [Show full text]
  • 3$,1 +,6725< &8/785( $1' 3+,/2623+<
    Pregledni rad Acta med-hist Adriat 2015; 13(1);113-130 Review article UDK: 612.8+1+61(091) 3$,1+,6725<&8/785($1'3+,/2623+< BOL: POVIJEST, KULTURA I FILOZOFIJA 0XUDG$KPDG.KDQ )DX]LD5D]D ,TEDO$NKWDU.KDQ S Pain, one of the universals of existence, has a long and venerable history, its origin initially attributed to godly punishment for disbelievers; and, with improved understanding, to physi- cal and psycho-social factors. “Pain is emotion or sensation?” has been a debatable issue. Razes developed pleasure-pain theory, founded on the theories of Socrates, Plato, Aristotle and Epicurus. Descartes’ Dualism shifted the centre of pain from the heart to the brain but negated the psychological contribution to its pathogenesis. Gate Control Theory, fascinated with the idea of “neurological gates”, highlighted the important role of the brain in dealing with the messages received. The International Association of the Study of Pain, in 1979, coined a denition of pain which is currently in use and was last updated on 6th October 2014. Its validity has been challenged and a new denition has been suggested. Whereas the experience is personalized, immeasurable and unsharable, dierent cultural groups react dierently to pain from relative tolerance to over-reaction. Gender and ethnic dierences in the perception of pain are well proven and the eects of various religious beliefs adequately scored. Despite extensive research over centuries, understanding of pain mechanisms is still far from optimal. Untiring eorts to identify a pain centre in the brain have been futile. Had it been possible, millions of pain suerers would have been relieved of their physical agony and mental anguish by the prick of needle.
    [Show full text]
  • Therapeutic Guidelines in Chronic Low Back Pain
    Pharmacia 68(1): 117–120 DOI 10.3897/pharmacia.68.e50297 Review Article Therapeutic guidelines in chronic low back pain Daniela Taneva1, Angelina Kirkova2, Pеtar Atanasov3 1 Medical University – Plovdiv, Department of Nursing, Faculty of Public Health, 15A Vasil Aprilov Blvd., Plovdiv 4002, Bulgaria 2 Medical University – Plovdiv, Department of Medical Informatics, Biostatistics and E-learning, Faculty of Public Health, 15A Vasil Aprilov Blvd., Plovdiv 4002, Bulgaria 3 Clinic of Internal Diseases, UMHATEM “N. I. Pirogov”, Sofia, Bulgaria Corresponding author: Angelina Kirkova ([email protected]) Received 20 January 2020 ♦ Accepted 27 January 2020 ♦ Published 8 January 2021 Citation: Taneva D, Kirkova A, Atanasov P (2021) Therapeutic guidelines in chronic low back pain. Pharmacia 68(1): 117–120. https://doi.org/10.3897/pharmacia.68.e50297 Abstract Chronic low back pain is a heterogeneous group of disorders with recurrent low back pain over 3 months. The high incidence of lumbago is an important phenomenon in our industrial society. Patients with chronic low back pain often receive multidisciplinary treatment. The bio approach, the psycho-approach, and the social approach optimally reduce the risk of chronicity by providing rehabilitation for patients with persistent pain after the initial acute phase. Damage to the structures of the spinal cord and the occur- rence of low back pain as a result of evolutionary, social and medical causes disrupt the rhythm of life and cause less or greater dis- ability. Recovery of patients with low back pain is not limited only to influencing the pain syndrome but requires the implementation of programs to eliminate the complaints that this pathology generates in personal, family and socio-professional terms.
    [Show full text]
  • Florence Hannah Renée Orlik PERSISTENT DENTO ALVEOLAR
    Florence Hannah Renée Orlik PERSISTENT DENTO ALVEOLAR PAIN DISORDER : DIAGNOSTIC AND TREATMENT Universidade Fernando Pessoa – Faculdade de Ciências da Saúde Porto - 2017 Florence Hannah Renée Orlik PERSISTENT DENTO ALVEOLAR PAIN DISORDER : DIAGNOSTIC AND TREATMENT Universidade Fernando Pessoa – Faculdade de Ciências da Saúde Porto - 2017 Florence Hannah Renée Orlik PERSISTENT DENTO ALVEOLAR PAIN DISORDER : DIAGNOSTIC AND TREATMENT Monography presented to the University of Fernando Pessoa as part of the requirements for obtaining a Master's Degree in Dental Medicine PERSISTENT DENTO ALVEOLAR PAIN DISORDER : DIAGNOSTIC AND TREATMENT ACKNOWLEDGMENTS : « Travaillez, prenez de la peine : C’est le fonds qui manque le moins. Que le travail est un trésor! » Jean de La Fontaine, Le laboureur et ses enfants Thanks to my grannies for always being models of bravery for me. Thanks to my brother, the light of my life, which illuminates me immutably ; divine spark presents thanks to my exceptional parents. To my dear family, thank you for teaching me the love of hard work, to be always present and enthusiastic for all my projects and to love me as I am. Thanks to my best friend, my crime partner, for these good and studious moments spent together. Give thanks to our Lord, without Him no one is. « I will give thanks to you, Lord, with all my heart; I will tell of all your wonderful deeds. I will be glad and rejoice in you; I will sing the praises of your name, O Most High. » « The Lord reigns forever; he has established his throne for judgment. He rules the world in righteousness and judges the peoples with equity.
    [Show full text]
  • Comparison of Pain Threshold and Duration of Pain Perception in Men
    ISSN 0103-5150 Fisioter. Mov., Curitiba, v. 27, n. 1, p. 77-84, jan./mar. 2014 Licenciado sob uma Licença Creative Commons DOI: http://dx.doi.org.10.1590/0103-5150.027.001.AO08 [T] Comparison of pain threshold and duration of pain perception in men and women of different ages [I] Comparação do limiar de dor e tempo de percepção de dor em homens e mulheres de diferentes faixas etárias [A] Marília Soares Leonel de Nazaré[a], José Adolfo Menezes Garcia Silva[b], Marcelo Tavella Navega[c], Flávia Roberta Fagnello-Navega[d] [a] Physical therapist, graduated from the Faculty of Philosophy and Science, Unesp, Marília, SP - Brazil, e-mail: [email protected] [b] MSc in Human Development and Technology at the Faculty of Philosophy and Sciences, Unesp, Rio Claro, SP - Brazil, e-mail: [email protected] [c] PhD, professor of Physical therapist, Department of Special Education, Faculty of Philosophy and Science, Unesp, Marília, SP - Brazil, e-mail: [email protected] [d] PhD, professor of Physical therapy, Department of Special Education, Faculty of Philosophy and Science, Unesp, Marília, SP - Brazil, e-mail: [email protected] [R] Abstract Introduction: Pain is a sensory and emotional experience that occurs with the presence of tissue injury, actual or potential. Pain is subjective, and its expression is primarily determined by the perceived intensity of the painful sensation, called the pain threshold. Objective: To evaluate whether there are differences in pain threshold (LD) and time to pain perception (TPED) between the gender in different age groups and to analyze the correlation between age and pain threshold in each gender.
    [Show full text]
  • Concentric Electrodes for Producing Acupuncture-Like Anesthetic Effects
    Tohoku J. Exp. Med., 1990, 160, 169-175 Concentric Electrodes for Producing Acupuncture-Like Anesthetic Effects HIROHISAODA and YOSHIKOFUJITANI Department of Physiology, Tottori University School of Medicine, Yonago 683 ODA,H. and FUJITANI,Y. Concentric Electrodesfor Produci. Acupuncture- Like Anesthetic Effects. Tohoku J. Exp. Med., 1990, 160 (3), 169-175 We designed concentric electrodes composed of a center electrode and an outer ring electrode. Electrical stimulation with two sets of such electrodes for 15 min as conditioning stimuli was given to the left hand of 35 adult subjects to induce acupuncture-like anesthetic effects. The effects immediately after the condition- ing were compared between stimulation through a pair of center electrodes alone at 3 Hz (conditioning 1) and simultaneous stimulation of 3 Hz through a pair of center electrodes and 100 Hz through a pair of outer ring electrodes (conditioning 2). In conditioning 2, modulating effects of 100 Hz stimuli through a pair of outer ring electrodes made it possible to increase the voltage strength of 3 Hz stimuli through a pair of center electrodes with maintaining the minimum perception of pricking sensation. In both conditioning procedures, muscle twitching was not accompanied. It was found that the respective stimulating current thresholds for faint touch sensation and also for pricking sensation at the right forearm could be elevated significantly more by conditioning 2 (1.54 and 1.40 times) than by conditioning 1 (1.20 and 1.14 times). - acupuncture ; electroanalgesia ; electrodes ; sensory thresholds Low frequency electrical cutaneous stimulation evoking muscle twitch ele- vates the threshold of pain sensation like acupuncture anesthesia (Andersson and Holmgren 1975; Hans and Terenius 1982).
    [Show full text]
  • Spinal Circuits Transmitting Mechanical Pain and Itch
    Spinal Circuits Transmitting Mechanical Pain and Itch The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters Citation Duan, Bo, Longzhen Cheng, and Qiufu Ma. 2017. “Spinal Circuits Transmitting Mechanical Pain and Itch.” Neuroscience Bulletin 34 (1): 186-193. doi:10.1007/s12264-017-0136-z. http:// dx.doi.org/10.1007/s12264-017-0136-z. Published Version doi:10.1007/s12264-017-0136-z Citable link http://nrs.harvard.edu/urn-3:HUL.InstRepos:35014869 Terms of Use This article was downloaded from Harvard University’s DASH repository, and is made available under the terms and conditions applicable to Other Posted Material, as set forth at http:// nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of- use#LAA Neurosci. Bull. February, 2018, 34(1):186–193 www.neurosci.cn https://doi.org/10.1007/s12264-017-0136-z www.springer.com/12264 REVIEW Spinal Circuits Transmitting Mechanical Pain and Itch 1 2 3 Bo Duan • Longzhen Cheng • Qiufu Ma Received: 15 February 2017 / Accepted: 1 April 2017 / Published online: 8 May 2017 Ó The Author(s) 2017. This article is an open access publication Abstract In 1905, Henry Head first suggested that trans- itch evoked by innocuous mechanical stimuli [1–10]. mission of pain-related protopathic information can be Chronic pain can be caused by tissue inflammation negatively modulated by inputs from afferents sensing (inflammatory pain) or by lesions of the nervous system innocuous touch and temperature. In 1965, Melzak and (neuropathic pain). Studies in the past decades have Wall proposed a more concrete gate control theory of pain revealed many mechanisms leading to allodynia.
    [Show full text]