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Opioid dosing

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https://www.readbyqxmd.com/read/29786873/in-vivo-profiling-of-four-centrally-administered-opioids-for-antinociception-constipation-and-respiratory-depression-between-colony-differences-in-sprague-dawley-rats
#1
A Kuo, M T Smith
Outbred rodent stocks including Sprague Dawley rats, are known for their genetic diversity and so they are often used to develop animal models of human disease. Although between-colony differences in pharmaco-behavioural studies have been published previously, a direct head-to-head comparison study, whereby all research was performed in the same laboratory by the same experimenter utilising the supraspinal route of drug administration in the same strain of rat, is lacking. Herein, we report our head-to-head comparison study, involving assessment of antinociception, constipation and respiratory depression evoked by single bolus intracerebroventricular (ICV) doses of morphine, buprenorphine, DPDPE and U69,593 using male Sprague Dawley rats sourced from a different breeding colony (BC2) from that (BC1) used by us previously...
May 22, 2018: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/29785888/the-impact-of-oprm1-s-genetic-polymorphisms-on-methadone-maintenance-treatment-in-opioid-addicts-a-systematic-review
#2
Bilel Oueslati, Olfa Moula, Rim Ghachem
AIM: Methadone is a long-acting opioid receptor agonist. It is prescribed to patients with opioid-related use disorders. The OPRM1 gene encodes for methadone's main receptor. It appears that polymorphisms in OPRM1 may affect the efficacy of methadone maintenance treatment (MMT). OBJECTIVE: Our purpose was to identify all relevant published papers dealing with the impact ofOPRM1's SNPs  on MMT's efficacy and to summarize results in order to evaluate the relevance of conducting pretherapeutic genotyping in opioid addicts prior to the onset of MMT...
May 22, 2018: Pharmacogenomics
https://www.readbyqxmd.com/read/29785554/interactions-between-kappa-and-mu-opioid-receptor-agonists-effects-of-the-ratio-of-drugs-in-mixtures
#3
Vanessa Minervini, Hannah Y Lu, Jahnavi Padarti, Daniela C Osteicoechea, Charles P France
RATIONALE: Pain is the leading reason for seeking health care, and mu opioid receptor agonists continue to be prescribed despite well-documented adverse effects. Kappa opioid receptor agonists have antinociceptive effects with little to no abuse liability and might be useful for treating pain in mixtures. Kappa:mu opioid mixtures might be useful if therapeutic effects of each drug can be selectively increased while reducing or avoiding the adverse effects that occur with larger doses of each drug alone...
May 22, 2018: Psychopharmacology
https://www.readbyqxmd.com/read/29784079/analgesic-efficacy-and-safety-of-hydromorphone-in-chinchillas-chinchilla-lanigera
#4
Emily A Evenson, Christoph Mans
Limited information is available regarding the efficacy of opioid analgesics in chinchillas. Here we sought to evaluate the analgesic efficacy and safety of hydromorphone in chinchillas. In a randomized, controlled, blind, complete crossover design, hydromorphone was administered at 0.5, 1, and 2 mg/kg SC to 16 chinchillas. Analgesic efficacy was determined by measuring hindlimb withdrawal latencies after a thermal noxious stimulus (Hargreaves method) at 0, 1, 2, 4, and 8 h after drug administration. Changes in daily food intake and fecal output after hydromorphone administration were recorded...
May 1, 2018: Journal of the American Association for Laboratory Animal Science: JAALAS
https://www.readbyqxmd.com/read/29782380/negative-modulation-of-spinal-%C3%AE%C2%BA-opioid-receptor-mediated-antinociception-by-the-%C3%A2%C2%B5-opioid-receptor-at-selective-doses-of-pentazocine
#5
Douglas L Robinson, Subodh Nag, Sukhbir S Mokha
The mixed-action κ-opioid receptor (KOR) agonist, pentazocine, binds to both KOR and the µ-opioid receptor (MOR). Racemic (±)-pentazocine and (-)-pentazocine, each administered systemically, have been shown to produce antinociception in various animal models. In contrast, racemic (±)-pentazocine failed to produce antinociception when administered intrathecally (i.t.). However, whether spinal activation of KOR and MOR by (-)-pentazocine produces antinociception and the relative contribution of KOR and MOR in mediating antinociception remain unknown...
May 18, 2018: Neuroreport
https://www.readbyqxmd.com/read/29781960/a-peripherally-restricted-cannabinoid-1-receptor-agonist-as-a-novel-analgesic-in-cancer-induced-bone-pain
#6
Hong Zhang, Dominique M Lund, Haley A Ciccone, William D Staatz, Mohab M Ibrahim, Tally M Largent-Milnes, Herbert H Seltzman, Igor Spigelman, Todd W Vanderah
Many malignant cancers, including breast cancer, have a propensity to invade bones, leading to excruciating bone pain. Opioids are the primary analgesics used to alleviate this cancer-induced bone pain (CIBP) but are associated with numerous severe side effects, including enhanced bone degradation, which significantly impairs patients' quality of life. In contrast, agonists activating only peripheral CB1 receptors (CB1Rs) have been shown to effectively alleviate multiple chronic pain conditions with limited side effects, yet no studies have evaluated their role(s) in CIBP...
May 16, 2018: Pain
https://www.readbyqxmd.com/read/29781932/postoperative-analgesic-effect-of-ultrasound-guided-intermediate-cervical-plexus-block-on-unipolar-sternocleidomastoid-release-with-myectomy-in-pediatric-patients-with-congenital-muscular-torticollis-a-prospective-randomized-controlled-trial
#7
Jin-Soo Kim, Han Bum Joe, Myong Chul Park, Hyoeun Ahn, Sook Young Lee, Yun Jeong Chae
BACKGROUND AND OBJECTIVES: Unipolar sternocleidomastoid release with myectomy (USRM) for correction of congenital muscular torticollis in pediatric patients produces moderate to severe postoperative pain. The objective of this trial was to examine the effect of ultrasound-guided intermediate cervical plexus block on postoperative pain after USRM. METHODS: Thirty-two patients (1-7 years old) were enrolled in this parallel-group, patient- and observer-blinded, randomized controlled trial...
May 17, 2018: Regional Anesthesia and Pain Medicine
https://www.readbyqxmd.com/read/29781876/postpartum-pain-management
#8
(no author information available yet)
Pain and fatigue are the most common problems reported by women in the early postpartum period. Pain can interfere with a woman's ability to care for herself and her infant. Untreated pain is associated with a risk of greater opioid use, postpartum depression, and development of persistent pain. Nonpharmacologic and pharmacologic therapies are important components of postpartum pain management. Because 81% of women in the United States initiate breastfeeding during the postpartum period, it is important to consider the drug effects of all prescribed medications on the mother-infant dyad...
May 17, 2018: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29781530/a-comparison-between-methadone-and-buprenorphine-for-perioperative-analgesia-in-dogs-undergoing-ovariohysterectomy
#9
M D Shah, D Yates, J Hunt, J C Murrell
OBJECTIVE: To investigate whether preoperative methadone provides superior perioperative analgesia compared to buprenorphine in dogs undergoing ovariohysterectomy. METHODS: Eighty female dogs were recruited to an assessor-blinded, randomised, clinical trial. Dogs received a premedication dose of 0·05 mg/kg acepromazine or 10 μg/kg medetomidine combined with either 0·3 mg/kg methadone or 20 μg/kg buprenorphine intramuscularly. Anaesthesia was induced with propofol and maintained with isoflurane...
May 21, 2018: Journal of Small Animal Practice
https://www.readbyqxmd.com/read/29781510/tramadol-opioid-abuse-is-associated-with-a-dose-and-time-dependent-poor-sperm-quality-and-hyperprolactinaemia-in-young-men
#10
A G A Farag, M A Basha, S A Amin, N F Elnaidany, N G Elhelbawy, M M T Mostafa, S A Khodier, R A Ibrahem, R Z Mahfouz
Tramadol, one of the most commonly abused drugs in Middle East, impacts spermatogenesis and disturbs reproductive hormones in animal studies. We aimed to investigate tramadol impact on sperm quality and on levels of testosterone, prolactin and gonadotropins, in tramadol abusers (n = 30) to age-matched control (n = 30). Abusers had significantly low percentages of sperm motility, normal forms and vitality compared with control (95% CI -40.7 to -19.3, -13.5 to -9.3 and -31.9 to -9.7 respectively). Hypoandrogenism (95% CI -4...
May 21, 2018: Andrologia
https://www.readbyqxmd.com/read/29781244/oprm1-influence-on-and-effectiveness-of-an-individualized-treatment-plan-for-prescription-opioid-use-disorder-patients
#11
Javier Muriel, César Margarit, Beatriz Planelles, María J Serralta, Carmen Puga, María-Del-Mar Inda, Esperanza Cutillas, Domingo Morales, José F Horga, Ana M Peiró
Screening for opioid use disorder should be considered in chronic non-cancer pain (CNCP) patients with long-term use of opioids. The aim of our study was to assess the effectiveness of an individualized treatment plan (ITP) for prescription opioid dependence that included screening of pharmacogenetic markers. An observational prospective study was performed using prescription opioid-dependent CNCP outpatients (n = 88). Patients were divided into nonresponders, responders, or high responders according to their response to the ITP...
May 20, 2018: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/29780165/a-medial-prefrontal-cortex-nucleus-acumens-corticotropin-releasing-factor-circuitry-for-neuropathic-pain-increased-susceptibility-to-opioid-reward
#12
Yuanzhong Kai, Yanhua Li, Tingting Sun, Weiwei Yin, Yu Mao, Jie Li, Wen Xie, Shi Chen, Likui Wang, Juan Li, Zhi Zhang, Wenjuan Tao
Recent studies have shown that persistent pain facilitates the response to morphine reward. However, the circuit mechanism underlying this process remains ambiguous. In this study, using chronic constriction injury (CCI) of the sciatic nerve in mice, we found that persistent neuropathic pain reduced the minimum number of morphine conditioning sessions required to induce conditioned place preference (CPP) behavior. This dose of morphine had no effect on the pain threshold. In the medial prefrontal cortex (mPFC), which is involved in both pain and emotion processing, corticotropin-releasing factor (CRF) expressing neuronal activity was increased in CCI mice...
May 21, 2018: Translational Psychiatry
https://www.readbyqxmd.com/read/29780077/the-effect-of-remifentanil-on-the-minimum-alveolar-concentration-mac-and-mac-derivatives-of-sevoflurane-in-dogs
#13
Yusuke Murahata, Yoshiaki Hikasa, Sho Hayashi, Koki Shigematsu, Natsuki Akashi, Tomohiro Osaki, Takeshi Tsuka, Yoshiharu Okamoto, Tomohiro Imagawa
Remifentanil is an ultra-short-acting μ-opioid receptor agonist. The purpose of this study was to determine the relationship of the minimum alveolar concentration (MAC) of sevoflurane and other MAC derivatives, including the MAC for blocking adrenergic responses (MAC-BAR) and the MAC at which tracheal extubation is occurred (MAC-extubation), with or without remifentanil infusion. Six healthy adult beagle dogs were randomly anesthetized three times for determining the MAC-BAR (SEVMAC-BAR ), MAC (SEVMAC ), and MAC- extubation (SEVMAC-extubation ) of sevoflurane under infusion of saline and remifentanil at rates of 0...
May 21, 2018: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/29779679/loperamide-abuse-cardiotoxicity-should-loperamide-still-be-an-over-the-counter-medication
#14
Amr Idris, Kenji Kaye
Loperamide is an over-the-counter anti-diarrheal medication that is inexpensive, easily accessible, and widely used. It is generally thought to be safe and effective without the potential for abuse. However, recent discovery of its ability to treat opioid withdrawal symptoms at high doses has led to not only its abuse, but also the need to recognize its cardiotoxicity due to the ability to prolong the QTc interval. We report a case of a 33 year old female with a history of opioid dependence who presented to the emergency department with acute onset shortness of breath and generalized weakness who was subsequently found to be in ventricular tachycardia...
May 18, 2018: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29778769/mandatory-review-of-a-prescription-drug-monitoring-program-and-impact-on-opioid-and-benzodiazepine-dispensing
#15
Erin L Winstanley, Yifan Zhang, Rebecca Mashni, Sydney Schnee, Jonathan Penm, Jill Boone, Cameron McNamee, Neil J MacKinnon
BACKGROUND: The purpose of this study is to determine whether Ohio House Bill 341, which mandated the use of Ohio's Prescription Drug Monitoring Program (PDMP), was an effective regulatory strategy to reduce opioid and benzodiazepine dispensing. METHOD: Secondary analysis of Ohio's PDMP data on prescription opioids and benzodiazepines dispensed from November 2014 to March 2017. An interrupted time series analysis was conducted to determine if there was a significant change in the quantity of opioids and benzodiazepines dispensed...
May 1, 2018: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/29778745/phytohormone-abscisic-acid-elicits-antinociceptive-effects-in-rats-through-the-activation-of-opioid-and-peroxisome-proliferator-activated-receptors-%C3%AE-%C3%AE
#16
Mahtab Mollashahi, Mehdi Abbasnejad, Saeed Esmaeili-Mahani
The phytohormone abscisic acid exists in animal tissues particularly in the brain. However, its neurophysiological effects have not yet been fully clarified. This study was designed to evaluate the possible antinociceptive effects of abscisic acid on animal models of pain and determine its possible signaling mechanism. Tail-flick, hot-plate and formalin tests were used to assess the nociceptive threshold. All experiments were carried out on male Wistar rats. To determine the role of Peroxisome proliferator-activated receptor β/δ (PPARβ/δ) and opioid receptors on the induction of abscisic acid antinociception, specific antagonists were injected 15min before abscisic acid...
May 17, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29777388/a-retrospective-study-of-opioid-prescribing-patterns-at-hospital-discharge-in-surgical-patients-with-obstructive-sleep-apnea
#17
Samir M Kendale, Jing Wang, Jeanna D Blitz, Steven Calvino, Germaine Cuff, Nicholas Barone, Andrew D Rosenberg, Lisa Doan
PURPOSE: Obstructive sleep apnea (OSA) is a risk factor for complications with postoperative opioid use, and in those patients with known or suspected OSA, minimization of postoperative opioids is recommended. We hypothesize that despite these recommendations, surgical patients with known or suspected OSA are prescribed postoperative opioids at hospital discharge at similar doses to those without OSA. METHODS: This was a retrospective analysis of the electronic health records of surgical patients from 1 November 2016 to 30 April 2017 at a single academic institution...
May 18, 2018: Canadian Journal of Anaesthesia, Journal Canadien D'anesthésie
https://www.readbyqxmd.com/read/29776702/naloxone-use-among-emergency-department-patients-with-opioid-overdose
#18
Catherine A Marco, William Trautman, Alexander Cook, Dennis Mann, Jordan Rasp, Oswald Perkins, Michael Ballester
BACKGROUND: Emergency department (ED) visits for unintentional opioid overdoses have increased dramatically. Naloxone hydrochloride (Narcan®) is an opioid antagonist commonly used to treat these overdoses. OBJECTIVE: This study was undertaken to identify experiences regarding naloxone use among ED patients with opioid overdose. METHODS: This prospective survey study was conducted at an urban level I trauma center. A survey was administered to eligible ED patients after unintentional opioid overdose...
May 16, 2018: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29776349/randomised-controlled-trial-rct-of-cannabinoid-replacement-therapy-nabiximols-for-the-management-of-treatment-resistant-cannabis-dependent-patients-a-study-protocol
#19
Anjali K Bhardwaj, David J Allsop, Jan Copeland, Iain S McGregor, Adrian Dunlop, Marian Shanahan, Raimondo Bruno, Nghi Phung, Mark Montebello, Craig Sadler, Jessica Gugusheff, Melissa Jackson, Jennifer Luksza, Nicholas Lintzeris
BACKGROUND: The cannabis extract nabiximols (Sativex®) effectively supresses withdrawal symptoms and cravings in treatment resistant cannabis dependent individuals, who have high relapse rates following conventional withdrawal treatments. This study examines the efficacy, safety and cost-effectiveness of longer-term nabiximols treatment for outpatient cannabis dependent patients who have not responded to previous conventional treatment approaches. METHODS/DESIGN: A phase III multi-site outpatient, randomised, double-blinded, placebo controlled parallel design, comparing a 12-week course of nabiximols to placebo, with follow up at 24 weeks after enrolment...
May 18, 2018: BMC Psychiatry
https://www.readbyqxmd.com/read/29775728/opioid-free-anaesthesia-why-and-how-a-contextual-analysis
#20
REVIEW
Patrice Forget
If the use of natural opiates, such as opium, is more than millennial, the history of synthetic opioids begins after 1950, with the development of the so-called 'modern' anaesthetic techniques. In 1962, in Belgium, the use of fentanyl, the first synthetic opioid for use in anaesthesia, is described. Subsequently, the use of opioids at high doses during surgery became common. However, over the last twenty years, many studies have questioned this practice, highlighting the many unknowns as the side effects of these molecules...
May 15, 2018: Anaesthesia, Critical Care & Pain Medicine
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