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Ticconi, L. Pulvirenti and N. Pierdicca",authors:[{id:"34519",title:"Dr.",name:"Francesca",middleName:null,surname:"Ticconi",fullName:"Francesca Ticconi",slug:"francesca-ticconi"},{id:"35944",title:"Prof.",name:"Luca",middleName:null,surname:"Pulvirenti",fullName:"Luca Pulvirenti",slug:"luca-pulvirenti"},{id:"35945",title:"Prof.",name:"Nazzareno",middleName:null,surname:"Pierdicca",fullName:"Nazzareno Pierdicca",slug:"nazzareno-pierdicca"}]},{id:"16083",title:"Electromagnetic Wave Propagation in Circular Tunnels",slug:"electromagnetic-wave-propagation-in-circular-tunnels",signatures:"Osama M. Abo-Seida",authors:[{id:"24823",title:"Prof.",name:"Osama",middleName:null,surname:"Abo-Seida",fullName:"Osama Abo-Seida",slug:"osama-abo-seida"}]},{id:"16084",title:"Propagation of Electromagnetic Waves in Thin Dielectric and Metallic Films",slug:"propagation-of-electromagnetic-waves-in-thin-dielectric-and-metallic-films",signatures:"Luc Levesque",authors:[{id:"26483",title:"Dr.",name:"Luc",middleName:"Joseph",surname:"Lévesque",fullName:"Luc Lévesque",slug:"luc-levesque"}]},{id:"16085",title:"Quasi-optical Systems Based on Periodic Structures",slug:"quasi-optical-systems-based-on-periodic-structures",signatures:"Gennadij Vorobjov, Yulya Shulga and Vitaliy Zhurbenko",authors:[{id:"3721",title:"Prof.",name:"Vitaliy",middleName:null,surname:"Zhurbenko",fullName:"Vitaliy Zhurbenko",slug:"vitaliy-zhurbenko"},{id:"26985",title:"Dr.",name:"Gennadiy",middleName:null,surname:"Vorobyov",fullName:"Gennadiy Vorobyov",slug:"gennadiy-vorobyov"},{id:"34021",title:"MSc.",name:"Yulya",middleName:null,surname:"Shulga",fullName:"Yulya Shulga",slug:"yulya-shulga"}]},{id:"16086",title:"Waveguide Mode Converters",slug:"waveguide-mode-converters",signatures:"Yoshihiro Kokubo",authors:[{id:"3795",title:"Dr.",name:"Yoshihiro",middleName:null,surname:"Kokubo",fullName:"Yoshihiro Kokubo",slug:"yoshihiro-kokubo"}]},{id:"16087",title:"Resonance Properties of Scattering and Generation of Waves on Cubically Polarisable Dielectric Layers",slug:"resonance-properties-of-scattering-and-generation-of-waves-on-cubically-polarisable-dielectric-layer",signatures:"Lutz Angermann and Vasyl V. Yatsyk",authors:[{id:"13342",title:"Prof.",name:"Lutz",middleName:null,surname:"Angermann",fullName:"Lutz Angermann",slug:"lutz-angermann"},{id:"28705",title:"Dr.",name:"Vasyl",middleName:"Vasylyovych",surname:"Yatsyk",fullName:"Vasyl Yatsyk",slug:"vasyl-yatsyk"}]},{id:"16088",title:"Cholesteric Elastomers with Mechanical Control of Optical Spectra",slug:"cholesteric-elastomers-with-mechanical-control-of-optical-spectra",signatures:"J. Adrian Reyes, Laura O. Palomares and Carlos G. Avendano",authors:[{id:"27277",title:"Prof.",name:"Juan Adrian",middleName:null,surname:"Reyes",fullName:"Juan Adrian Reyes",slug:"juan-adrian-reyes"},{id:"29798",title:"Dr.",name:"Laura Olivia",middleName:null,surname:"Palomares",fullName:"Laura Olivia Palomares",slug:"laura-olivia-palomares"},{id:"29799",title:"Dr.",name:"Carlos Gabriel",middleName:null,surname:"Avendaño",fullName:"Carlos Gabriel Avendaño",slug:"carlos-gabriel-avendano"}]},{id:"16089",title:"Time Domain Reflectometry: Temperature-dependent Measurements of Soil Dielectric Permittivity",slug:"time-domain-reflectometry-temperature-dependent-measurements-of-soil-dielectric-permittivity",signatures:"Wojciech Skierucha",authors:[{id:"27461",title:"Prof.",name:"Wojciech",middleName:null,surname:"Skierucha",fullName:"Wojciech Skierucha",slug:"wojciech-skierucha"}]},{id:"16090",title:"The Temperature Behavior of Resonant and Non-resonant Microwave Absorption in Ni-Zn Ferrites",slug:"the-temperature-behavior-of-resonant-and-non-resonant-microwave-absorption-in-ni-zn-ferrites",signatures:"Raul Valenzuela",authors:[{id:"25367",title:"Prof.",name:"Raul",middleName:null,surname:"Valenzuela",fullName:"Raul Valenzuela",slug:"raul-valenzuela"}]},{id:"16091",title:"Complex Permittivity Measurement of High Loss Liquids and its Application to Wine Analysis",slug:"complex-permittivity-measurement-of-high-loss-liquids-and-its-application-to-wine-analysis",signatures:"Z.E. Eremenko, V.N. Skresanov, A.I. Shubnyi, N.S. Anikina, V.G. Gerzhikova and T.A. Zhilyakova",authors:[{id:"29355",title:"Prof.",name:"Zoya",middleName:null,surname:"Eremenko",fullName:"Zoya Eremenko",slug:"zoya-eremenko"},{id:"32024",title:"Mr.",name:"Valery",middleName:null,surname:"Skresanov",fullName:"Valery Skresanov",slug:"valery-skresanov"},{id:"32025",title:"Mr.",name:"Tatyana",middleName:null,surname:"Zhilyakova",fullName:"Tatyana Zhilyakova",slug:"tatyana-zhilyakova"}]},{id:"16092",title:"EMI Shielding using Composite Materials with Plasma Layers",slug:"emi-shielding-using-composite-materials-with-plasma-layers",signatures:"Ziaja Jan and Jaroszewski Maciej",authors:[{id:"25538",title:"Dr.",name:"Jan",middleName:null,surname:"Ziaja",fullName:"Jan Ziaja",slug:"jan-ziaja"},{id:"33964",title:"Dr.",name:"Maciej",middleName:null,surname:"Jaroszewski",fullName:"Maciej Jaroszewski",slug:"maciej-jaroszewski"}]},{id:"16093",title:"Reduction of Reflection from Conducting Surfaces using Plasma Shielding",slug:"reduction-of-reflection-from-conducting-surfaces-using-plasma-shielding",signatures:"Cigdem Seckin Gurel and Emrah Oncu",authors:[{id:"26203",title:"Prof.",name:"Çiğdem Seçkin",middleName:null,surname:"Gürel",fullName:"Çiğdem Seçkin Gürel",slug:"cigdem-seckin-gurel"},{id:"36210",title:"Mr.",name:"Emrah",middleName:null,surname:"Öncü",fullName:"Emrah Öncü",slug:"emrah-oncu"},{id:"128103",title:"Prof.",name:"Emrah",middleName:null,surname:"Öncü",fullName:"Emrah Öncü",slug:"emrah-oncu"}]},{id:"16094",title:"Electromagnetic Waves and Human Health",slug:"electromagnetic-waves-and-human-health",signatures:"Feyyaz Ozdemir and Aysegul Kargi",authors:[{id:"24790",title:"Prof.",name:"Feyyaz",middleName:null,surname:"Ozdemir",fullName:"Feyyaz Ozdemir",slug:"feyyaz-ozdemir"},{id:"36228",title:"Dr.",name:"AYSEGUL",middleName:null,surname:"KARGİ",fullName:"AYSEGUL KARGİ",slug:"aysegul-kargi"},{id:"128104",title:"Dr.",name:"Aysegul",middleName:null,surname:"Kargi",fullName:"Aysegul Kargi",slug:"aysegul-kargi"}]},{id:"16095",title:"Image Resolution and Sensitivity Improvements of a Molecular Imaging Technique Based on Magnetic Nanoparticles",slug:"image-resolution-and-sensitivity-improvements-of-a-molecular-imaging-technique-based-on-magnetic-nan",signatures:"Yasutoshi Ishihara, Tsuyoshi Kuwabara and Naoki Wadamori",authors:[{id:"2895",title:"Dr.",name:"Yasutoshi",middleName:null,surname:"Ishihara",fullName:"Yasutoshi Ishihara",slug:"yasutoshi-ishihara"},{id:"39375",title:"Mr.",name:"Tsuyoshi",middleName:null,surname:"Kuwabara",fullName:"Tsuyoshi Kuwabara",slug:"tsuyoshi-kuwabara"},{id:"39376",title:"Dr.",name:"Naoki",middleName:null,surname:"Wadamori",fullName:"Naoki Wadamori",slug:"naoki-wadamori"},{id:"128105",title:"Prof.",name:"Tsuyoshi",middleName:null,surname:"Kuwabara",fullName:"Tsuyoshi Kuwabara",slug:"tsuyoshi-kuwabara"}]}]}]},onlineFirst:{chapter:{type:"chapter",id:"71663",title:"Adjuvant Drugs to Local Anesthetics",doi:"10.5772/intechopen.91980",slug:"adjuvant-drugs-to-local-anesthetics",body:'Local anesthetics (LA) are widely used in clinical practice for regional anesthesia or analgesia in various locations like central neuraxial blockade, peripheral nerve block, intravenously, and local infiltration. Infiltration with LA around the nerve produces analgesia by interrupting pain signals to the brain. The analgesic effect of a nerve block with LAs lasts only a few hours. Therefore, after surgery patients may suffer from moderate to severe acute pain. The duration of the action of LA can be prolonged by either increasing the dose or administering a continuous infusion of the drug, which can lead to dose-dependent side effects on the cardiovascular system and/or central nervous system (CNS) [1, 2]. The popularity of peripheral nerve blocks for surgical anesthesia as well as for postoperative analgesia has increased significantly due to anesthetists becoming more familiar with ultrasound-guided techniques. While the use of catheters for continuous infusions allows for sustained pain relief during the perioperative period, they can increase the challenges related to patient management, catheter displacement, and the potential for increased infection risk. In the case a long-acting LA or continuous block is used, sensory block is also associated with prolonged motor block in the postoperative period. Prolonged motor blockade in the postoperative period is undesirable as it leads to delayed mobilization of the patient and hence increased risk of complications.
The adjuvant drugs of regional LAs improve the quality and duration of anesthesia and analgesia and patient safety, thus increasing patient satisfaction and comfort [3, 4]. The aim of this chapter is to discuss the past, present, and future trends in the use of adjuvants, as well as their benefits and side effects.
Adjuvants are drugs which, when administered along with LA agents, may improve the latency of onset and duration of analgesia and counteract the undesirable effects associated with large doses of LAs. The use of adjuvant drugs has the potential to improve the efficacy of peripheral and central neuraxial blocks and decrease LA systemic toxicity by chiefly prolonging the duration of sensory block, enhancing motor blockade, and limiting the overall dose requirement of LAs. An ideal adjuvant should not only shorten the speed of onset of action of the LA drug but also reduce its dosage along with providing hemodynamic stability, optimal sedation, and minimum adverse effects.
A wide variety of adjuvant drugs have been used for both neuraxial and peripheral nerve blocks (Table 1). They can be broadly divided into non-opioids and opioids.
Opioids
|
Vasoactive agents
|
Alpha-2 adrenergic agonists
|
Steroids
|
Nonsteroidal anti-inflammatory drugs
|
Other agents
|
Classification of adjuvant drugs.
Current research is directed toward a search for agents and techniques which would prolong LA action while limiting its side effects and giving the patient its maximum benefit. These include techniques like the use of charged molecules to produce LA action (tonicaine and n-butyl tetracaine), newer delivery mechanisms for prolonged bioavailability (liposomal, cyclodextrin, and microsphere systems), and the use of other drugs (dextrans, adenosine, neuromuscular blockers) [3, 4].
While the use of LA adjuvants in regional anesthesia [5, 6] is in widespread clinical off-label use and has been subject to multiple clinical trials, we would like to emphasize on the fact that only a few adjuvants have been approved by the Food and Drug Administration (FDA), so absolute caution must be exercised while using these adjuvants.
Opioids are the most common and the earliest used LA adjuvants. Their use in neuraxial and peripheral nerve blocks has evolved greatly over the last 30 years. It is advisable to use specific opioids, at appropriate doses and routes of administration that result in a primarily spinal site of action rather than a systemic opioid [7]. Afferent noxious stimuli from peripheral tissues converge in the dorsal horn of the spinal cord, where the primary nociceptive neuron synapses with the interneurons and the second-order nociceptive neuron in the spinothalamic tract. Blockade of these opioid receptors by agonists helps to suppress afferent nociceptive input from pain sites by modulating the release of pain-pathway associated peptides [8]. Opioids produce analgesia by mimicking the actions at specific receptors of endogenous opioid peptides. These peptides are beta-endorphin, met-enkephalin, and dynorphin. The three main types of opiate receptors, each with its own subtypes, are mu (μ), delta (δ), and kappa (ĸ) [9]. The most important target for opioids is the μ-receptor (endorphin), and intrathecal opioids appear to selectively modulate C- and A-fibers with minimal impact on dorsal root axons. The enkephalins are the primary endogenous ligands of the delta receptor and are involved with spinal analgesia. Dynorphin is the ligand for the kappa receptor. Activation of the kappa receptor results in segmental spinal analgesia and sedation. Most of the mixed agonist–antagonist opioids like butorphanol bind to the kappa receptor.
The exact mechanism of action of opioids at peripheral nerve is still uncertain. Evidences have begun to support the presence of peripheral opioid receptors [10]. The possible mechanism of prolonged analgesia by peripheral opioid administration could be through direct binding at opioid receptors of dorsal nerve root aided by axonal flow, diffusion through brachial plexus sheath to extradural or subarachnoid space to dorsal horn, and central action after peripheral systemic uptake [11].
The first opioid to be used intrathecally was morphine with the initial clinical study published in 1979 [12]. Morphine being relatively less hydrophobic than other opioids remains in the CSF for a longer time and therefore occupies the rostral receptor sites for a longer duration than other opioids [13]. Consequently, morphine produces a long-lasting and adequate analgesia with intrathecal use [14]. However, this huge advantage is offset by the increased risk of adverse effects, especially postoperative respiratory depression [15], which remains a particular concern among anesthetists. Intrathecal and epidural morphine are associated with a high incidence of side effects like nausea, vomiting, pruritus, urinary retention, sedation, and delayed respiratory depression [13, 16]. The recommended dose for intrathecal administration is 50–300 μg, while as 2–5 mg of epidural loading dose is considered adequate. The risk of side effects increases exponentially with the increase in the dose [16, 17].
Pethidine (meperidine) is a lipophilic phenylpiperidine derivate that is 30 times more lipid soluble and 10 times less potent than morphine, leading to a faster onset and a shorter duration of action than morphine. Pethidine possesses some local anesthetic properties (motor and sensory fiber block) which lets it stand out from the rest of the opioid agents. Pethidine is a popular choice for obstetric analgesia used mainly in epidural analgesia during labor. Intrathecal use of pethidine is not recommended. The incidence of nausea, vomiting, and hypotension is more with pethidine than with morphine. Pethidine can be injected as a loading dose of 25–50 mg in the epidural space.
In addition to acting on the spinal cord receptors and peripheral receptors, fentanyl is also reported to have a local anesthetic like action, but this requires a very high concentration (50 g/mL) which is not clinically feasible [18]. Fentanyl as an adjuvant to LA causes significant prolongation of duration of analgesia but delays the onset of both sensory and motor blockade compared to LAs alone [19]. The change in pH of the anesthetic solution resulting in slower penetration of nerve membrane by LA is considered to be responsible for this effect [20]. The recommended intrathecal dose is 10–25 μg, and the epidural loading dose is 50–100 μg. Fentanyl as adjuvant does not prolong motor block, so it allows early ambulation, thereby reducing the morbidity. The duration of action is 2–4 h, and the risk of respiratory depression is very low and of short duration [17].
A potent agonistic opioid was synthesized in the mid-1970s. A piperidine derivative is 6–10 times more potent than fentanyl, depending on the route of administration; it has been registered for intravenous, epidural, and subarachnoid administration. It is considered to be more lipid soluble than its counterparts, a better μ receptor ligand. It is an extremely potent opioid with a faster onset of action than its counterparts. Its use in clinical practice is limited by its short duration of action and high side effect profile. The recommended intrathecal dose is 2.5–10 μg, and epidural loading dose is 10–50 μg [17].
This opioid has intermediate lipid solubility. Due to its hydrophilicity, epidural hydromorphone can cross the blood-brain barrier faster and provide fast onset and modest duration of action.
Buprenorphine is a highly lipophilic partial opioid receptor agonist. It is also considered to have local-anesthetic-like capacity by blocking voltage-gated sodium channels. Buprenorphine and its metabolite nor-buprenorphine have been shown to act on κ and δ opioid receptors in addition to μ receptors which account for its antihyperalgesic effects. The risk of side effects like postoperative nausea and vomiting (PONV) is more with the use of perineural buprenorphine [21].
It is a diacetylated analogue of morphine with a potency of approximately 1.5–2 times that of morphine. This leads to a faster onset and slightly shorter duration of action than morphine. It is a lipophilic semi-synthetic opioid and is a prodrug that is converted to its active metabolites (morphine and 6-monoacetyl morphine) by deacetylation in the liver and neural tissues. The recommended intrathecal dose is 300–400 μg, and epidural loading dose is 2–5 mg [17, 22].
Tramadol is a weak centrally acting opioid. A potency ratio of oral morphine to oral tramadol has been reported to be between 1:4 and 1:10. It has been shown to have Na+ and K+ channel blocking properties and can block motor and nociceptive signals similar to that of LAs. The central and peripheral analgesic effects of tramadol have not been fully explained, but it is a selective agonist of μ-receptors. Tramadol also prevents reuptake of noradrenaline and enhances both serotonin and noradrenaline release. The monoaminergic activity of tramadol increases the inhibitory activity of the descending pain pathways, resulting in a suppression of nociceptive transmission at the spinal level [23].
Vasoactive drugs are the oldest adjuvants that have been used, although at the beginning their action was attributed more to the fact that their vasoconstrictor effect prolonged the anesthetic and analgesic results of LAs by decreasing the blood flow of the site where they were injected. Adrenaline was the first vasopressor used.
Epinephrine has been used along with LA in neuraxial and peripheral nerve blocks since Heinrich Braun first experimented with its use as a “chemical tourniquet” in the early 1900s [24]. Epinephrine potentiates the LA action. The substantia gelatinosa of the dorsal horn of the spinal cord houses alpha-2 adrenoreceptors wherein the epinephrine by its direct action mediates its antinociceptive properties resulting in presynaptic inhibition of transmitter release from Aδ and C fibers. Also its vasoconstrictive properties limit the systemic absorption of LA leading to prolonged duration of action. There are concerns about epinephrine being a potent vasoconstrictive agent can place the blood supply of the spinal cord at risk and may lead to ischemia of the spinal cord leading to permanent damage. Epinephrine is typically administered in doses of 0.2–0.3 mg [25].
Phenylephrine has a mechanism of action similar to that of epinephrine. It has vasoconstrictive abilities, thus limiting the uptake of LA and prolonging their duration of action. Phenylephrine in the dose of 2–5 mg prolongs both lidocaine and tetracaine spinal anesthesia to a similar extent as epinephrine. The use of phenylephrine has declined in popularity because of its association with transient neurologic symptoms (TNS) [26].
Alpha-2 adrenergic receptor agonists have recently been the focus of interest for their sedative, analgesic, perioperative sympatholytic, anesthetic sparing, and hemodynamic stabilizing properties. The central α-2-AR agonists inhibit nociceptive impulses by activating post-junctional α-2-adrenoceptors in the dorsal horn of the spinal cord. These receptors are located on primary afferent terminals (both at peripheral and at spinal endings), on neurons in the superficial lamina of the spinal cord, and within several brainstem nuclei responsible for analgesia. They block the conduction of C- and A-delta fibers and increase potassium conductance, thus intensifying conduction block. They also cause local vasoconstriction, thereby reducing vascular uptake of the LA from around the neural structures and in turn prolonging the duration of action [27, 28, 29].
Clonidine is an imidazole derivative with selective partial agonist properties which inhibit the nociceptive impulses by acting on the post-junctional alpha-2 adrenoreceptors in the dorsal horn of the spinal cord. In neuraxial blocks, it has a local effect leading to decreased sympathetic outflow, while in peripheral nerve blocks it prolongs the duration of analgesia by hyperpolarization of cyclic nucleotide-gated cation channels. Clonidine enhances and prolongs sensory and enhances motor blockade when used along with LA for epidural or peripheral nerve blocks [30]. The alpha-2 adrenergic agonists also enhance analgesia from intraspinal opioids by interactions with both pre- and post-synaptic receptors within the spinal cord.
Although there is no agreement on the doses of intrathecal clonidine [31], the most commonly used doses vary widely. The most recommended dose for intrathecal use is 15–150 μg, with the incidence of adverse effects (bradycardia, sedation, hypotension) increasing with doses above 150 μg. Clonidine can be used via epidural route with a bolus dose of 75–150 μg. In pediatric anesthesia, the use of clonidine (1 μg/kg) as an adjuvant along with LA for caudal blocks doubles the duration of analgesia when compared to LA alone but causes marked sedation [17].
Clonidine has been found to prolong the action of local anesthetics in peripheral blocks in the postoperative period. This effect of clonidine is dose-related. After brachial plexus block with mepivacaine, the minimum doses which significantly prolong analgesia and anesthesia are 0.1 and 0.5 μg/kg, respectively [32].
Dexmedetomidine is seven times more selective agonist to alpha-2 receptor than clonidine (seven times more specific for alpha-2 than alpha-1) but has a similar mechanism of blocking hyperpolarization-activated cation channels. When used as an adjuvant to LA for neuraxial block, dexmedetomidine leads to reduced onset time of sensory and motor block, increased duration of sensory block, and delayed recovery from motor blockade. It leads to prolongation of postoperative analgesia, decreased requirement of additional analgesics, delayed first rescue analgesic, and decreased postoperative shivering. Dose in spinal anesthesia varies from 3 to 15 μg as an adjuvant to LA [33]. For caudal epidural block, 1–2 μg/kg of dexmedetomidine along with bupivacaine can lead to prolonged analgesia without significant side effects [34].
The most common reported adverse effects are bradycardia and hypotension. Bradycardia due to dexmedetomidine is resistant to atropine, and higher doses are needed; although rare, even cardiac arrest can occur.
It has been shown that clonidine and dexmedetomidine administered orally, intramuscularly, and intravenously also prolong the anesthetic effect of intrathecal LA [35, 36, 37, 38, 39, 40].
Acute inflammation from tissue injury has an important role in surgical pain, and glucocorticoids may be useful for its anti-inflammatory effect. Johansson et al. [41] investigated the corticosteroid effect on the plantar nerve of rats finding that methylprednisolone suppresses transmission in thin unmyelinated C fibers but not in myelinated A-beta fibers. The effect was reversed when the corticosteroid was removed, suggesting a direct action in the membrane.
Dexamethasone-induced prolongation of peripheral nerve blockade following LA injection is commonly attributed to its anti-inflammatory action. It also improves the quality and duration of analgesia over LAs alone. This is thought to be mediated by its capacity to alter the release of inflammatory mediators, reduce ectopic neuronal discharge, and inhibit potassium channel-mediated discharge of nociceptive C fibers [41]. Its action on glucocorticoid receptor is considered to alter the functioning of ion channels and produce acidosis around the nerve cell, thereby reducing the concentration of LA required to produce blockade of signal transmission or trapping the highly ionized bupivacaine molecule into the neuronal cell. Studies using dexamethasone for postoperative pain relief have produced positive results mainly in surgery involving large amounts of tissue trauma. A systematic review and meta-analysis included 1695 patients distributed in 29 controlled clinical trials where dexamethasone 4 and 8 mg perineural was used as adjuvant to LA. These authors found that dexamethasone increased the mean (95% CI) duration of analgesia by 233 (172–295) min when injected with short- or medium-term action LA and by 488 (419–557) min when injected with long-term action LA, p < 0.00001 for both. However, these results should be taken with caution due to the great heterogeneity of results, with I2 exceeding 90% for both analysis. Meta-regression did not show an interaction between dose of perineural dexamethasone (4–10 mg) and duration of analgesia (r2 = 0.02, p = 0.54). There were no differences between 4 and 8 mg dexamethasone on subgroup analysis [42]. After reviewing the current literature, Wiesmann et al. [43] prefer a systemic application mode (intravenously) over a perineural route of dexamethasone administration as a complement to peripheral nerve blocks. A single dose of dexamethasone could be a useful complement to prolong peripheral nerve blocks. In a randomized controlled triple-blind crossover study in 24 male volunteers, the authors used ultrasound-guided ulnar nerve blocks (ropivacaine 0.75% wt/vol, 3 ml, with saline 1 ml with or without dexamethasone 4 mg) which were performed on three occasions in each volunteer along with an IV injection of saline 1 ml with or without dexamethasone 4 mg. The median [inter-quartile range (IQR)] duration of sensory block was 6.87 (5.85–7.62) h in the control group, 7.37 (5.78–7.93) h in the perineural group, and 7.37 (6.10–7.97) h in the IV group (P = 0.61). There was also no significant difference in block onset time between the three groups. Dexamethasone 4 mg had no clinically significant effect on the duration of sensory block provided by ropivacaine applied to the ulnar nerve [44]. The role of dexamethasone as an adjunct in peripheral nerve blockades is still unclear.
Several studies have demonstrated that the presence of COX-2 receptors in the dorsal horn of the spinal cord could regulate spinal nociceptive transmission [45]. Some studies suggest that administering a COX-2 antagonist directly on the central or peripheral nerve might have a better analgesic profile than intravenous administration of the same drug [46]. Basically COX-2 inhibitors reduce inflammation and pain sensation by inhibiting prostaglandin production. However, the role of COX-2 in the central nervous system is of more importance. Inflammation can induce COX-2 production and will lead to the release of prostanoids that sensitize the peripheral nociceptor terminals and produce localized hyperalgesia. It is hence thought that the administration of COX-2 antagonist on spinal or peripheral nerves may be a more effective mode of pain relief than the intravenous or intramuscular route. There are very less studies on this subject. Further research and studies need to be conducted to verify the use of NSAIDs as adjuvants.
Ketamine is a noncompetitive antagonist of NMDA receptor that has been shown to have local anesthetic properties. Ketamine acts on more than one region. It has actions at monoaminergic receptors, opioid receptors, voltage-sensitive calcium channels, and muscarinic receptors, in addition to local anesthetic actions through sodium channel blockade. Systemic ketamine causes central summation in the second-order pain neuron and decreases severe pain [3, 47, 48]. Epidural administration of ketamine at 0.5–1 mg/kg has been shown to reduce intraoperative and postoperative analgesic requirements without increased side effects [25]. Preservative-free S(+)-ketamine administered during caudal block for children at a dose of 0.5 mg/kg has been shown to extend analgesia time by several hours [17]. Intrathecal administration of ketamine is not recommended.
The risk of psychomimetic adverse effects such as hallucinations is a worrying factor for most anesthetists, limiting its use, but it can be easily overcome by using intravenous benzodiazepines as premedication prior to the block.
Midazolam, a water-soluble benzodiazepine, an indirect agonist of the gamma-aminobutyric acid (GABA) receptor, has been studied primarily as an adjuvant for neuraxial anesthesia. Addition of preservative-free midazolam to 0.5% hyperbaric bupivacaine for subarachnoid block in infraumbilical surgery has been found to prolong the duration of effective analgesia as compared to the same concentration of bupivacaine alone and delays the need for postoperative rescue analgesics without having any reported significant side effects or hemodynamic instability. The use of intrathecal midazolam also decreases the incidence of postoperative nausea and vomiting. A small diluted intrathecal dose (1–2.5 mg) of preservative-free midazolam is reported to have few systemic side effects and is free of short-term neurotoxicity [49]. An infusion of epidural midazolam at 10–20 μg/kg/h for up to 12 h is considered safe.
Neostigmine is an acetylcholinesterase inhibitor that can enhance analgesia by acting on muscarinic receptors and increasing endogenous acetylcholine at the nerve terminal. It produces spinal analgesia in the preclinical models. Intrathecal neostigmine produces analgesia by the inhibition of (endogenous spinal neurotransmitter) acetylcholine destruction via muscarinic and cholinergic receptors located at dorsal horn of spinal cord, substantia gelatinosa, and in lesser amounts at laminae III and V [50]. There is a high incidence of nausea and vomiting and prolongation of recovery from spinal anesthesia following intrathecal administration of neostigmine, implying that it may not be a useful additive for ambulatory spinal anesthesia. The dose of intrathecal neostigmine ranges from 10 to 50 μg with the side effects increasing as the dose rises.
Magnesium is an N-methyl-D-aspartate (NMDA) antagonist that plays a role in moderating calcium influx into neurons. Research has demonstrated that magnesium decreases peripheral nerve excitability and enhances the ability of lidocaine to raise the excitation threshold of A-beta fibers.
Intrathecal and epidural use of magnesium has shown variable results. It may prolong LA/opioid block in women in labor at a dose of 50 mg, but a very high dose of magnesium has been reported to produce transient neurological toxicity [17]. Farzanegan et al. compared the combination of bupivacaine 12.5 mg and morphine 2 mg versus bupivacaine 12.5 mg and morphine 2 mg and magnesium 50 mg versus placebo epidurally for postoperative analgesia after thoracotomy. These authors achieved better analgesia and lower consumption of postoperative morphine significantly in the magnesium group [51]. In preeclamptic parturients doses of 50 mg of intrathecal magnesium with epidural ropivacaine significantly prolonged postoperative analgesia compared with 1 mg intrathecal midazolam without any complications [52]. In a recent meta-analysis, 11 studies showed that the use of epidural magnesium as an adjuvant to bupivacaine is still controversial. Although epidural magnesium prolonged the time of the first rescue analgesic and reduced the number of patients who required rescue analgesics, as well as the requirement of these analgesics, further studies are needed to assess their usefulness [53].
Local anesthetic agents are usually packed at low pH to enhance their shelf life. In anesthetic practice, there has been considerable interest in studying the effect of pH on the onset, duration, and potency of blockade of LAs. It is proven that alkalinization of the LA improves the quality of block by influencing the portioning coefficient of anesthetic between aqueous solution and biological membranes [20]. Adding sodium bicarbonate to lidocaine decreases the latency of onset and enhances the depth of epidural blockade by increasing the concentration of non-ionized drug. The alkaline pH increases the extraneural amount of non-ionized LA, which is the form that diffuses through the lipid phase of the neural membrane leading to more rapid diffusion across perineural tissue barriers [54]. CO2 produced by the addition of bicarbonate and bicarbonate per se reduces the margin of conduction safety of the neural membrane. Moreover, CO2 penetrates into the nerve, where it may determine trapping of the active cationic form of LA by acidifying the axoplasm [55].
Movements of ions through the nerve membrane are considered one of the main steps in the process of excitation and propagation of nerve stimuli. A nerve impulse can be effectively blocked by accumulation of potassium ions outside the neuron [56]. Thus, administration of exogenous potassium chloride will reinforce and prolong the blockade produced by LA. The addition of potassium chloride to LA increases the extracellular concentration and depolarizes the nerve membrane and thus blocks the conduction of nerve impulses. Potassium chloride up to 4 mmol/l to isotonic solutions of lidocaine enhances the clinical effectiveness of the combination [57]. The addition of physiological amounts of potassium chloride shortens the latency period and prolongs the duration of the blockade.
Adenosine receptors are expressed on the surface of most cells. Five classes of adenosine receptors have been identified. The A1 and A2 receptors are present centrally and peripherally, with agonism of the A1 receptor leading to antinociceptive response and that of the A2 receptor being algogenic (i.e., activation results in pain). The diagnostic and therapeutic role for intrathecal adenosine in acute and chronic pain states is under investigation by several research groups. Intrathecal adenosine decreases the spontaneous and evoked pain intensity in patients with neuropathic pain involving hyperalgesia/dysesthesia/allodynia [58]. Its interaction along with spinal LA is just beginning to be studied.
Low molecular weight dextran (LMWD) was used as an adjuvant with LA as early as in the 1970s, but the efficacy of dextrans including LMWD remained controversial, as several studies reported an absence of any substantial difference in analgesic duration with their addition. That might have been due to poor techniques of regional anesthesia. The use of USG regional blocks has rekindled the use of LMWD as adjuvant. The addition of LMWD to a LA and epinephrine mixture when used as an infiltration anesthesia [59], or to a LA alone when performing a regional block [33], safely prolongs the effective action by reducing systemic absorption. More studies need to be conducted to elicit the exact mechanism and dosing ranges.
A word of caution regarding the use of additives in LAs is that only preparations without preservatives should be used, since these can be neurotoxic. Also, only adjuvants in clinically safe doses should be used in order to avoid getting the side effects due to excessive dosages.
Hence further research is required to find the exact mechanism of action and the safe dose of various adjuvants in order to avoid cardiovascular and neurological complications. The practice of making off-label use of drugs without getting FDA approval should be discouraged.
Locoregional anesthesia is increasingly used as it has demonstrated efficacy, safety, and low costs. Patients and surgeons have realized its enormous advantages. Although the use of LA in the management of locoregional anesthesia, postoperative pain, and chronic pain is limited by its duration of action and dose-dependent adverse effects that mainly affect the cardiovascular and CNS systems, this has been improved with the use of various LA adjuvant drugs. Adjuvants are medications that work synergistically with LAs to improve the onset, duration, and quality of anesthesia-analgesia in regional techniques, as well as greatly reducing the use of opioid analgesics.
The arsenal of adjuvants has developed from adrenaline, opioids, to a large group of non-opioid medications with various mechanisms of action. Opioids are the most commonly used adjuvants and range from morphine, fentanyl, and sufentanil to hydromorphone, buprenorphine, and tramadol with very different results. Its use has been limited by its adverse effects such as respiratory depression, nausea, vomiting, and pruritus, especially with its neuraxial use. Other adjuvants include alpha-2 agonists such as clonidine and dexmedetomidine, midazolam, NMDA antagonists including ketamine and magnesium, neostigmine, sodium bicarbonate, and nonsteroidal anti-inflammatory drugs. Concern regarding the safety profile of these adjuvants is due to their potential neurotoxicity and neurological complications that may limit their use and require further investigation.
The authors declare no conflict of interest.
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\n\nOut of all of the publishing options available to researchers, why choose to contribute your research to an IntechOpen Edited Volume? The reasons are simple. IntechOpen has worked exceptionally hard over the past years to fine tune the Open Access book publishing process and we continue to work hard to deliver the best for all of our contributors. The quality of published content is of utmost importance to us, followed closely by speed, and of course, availability and accessibility. To view current Open Access book projects that are Open for Submissions visit us here.
\n\nQUALITY CONTENT
\n\nOver the years we have learned what is important. What makes a difference to the researchers that work with us, what they value. Something that is very high not only on their lists, but our own, is the quality of the published content.
\n\nOur books contain scientific content written by two Nobel Prize winners, two Breakthrough Prize winners and 73 authors who are in the top 1% Most Cited.
\n\nWith regular submission for coverage in the single most important database, the Book Citation Index in the Web of Science™ Core Collection (BKCI), and no rejected submissions to date, over 43% of all Open Access books indexed in the BKCI are IntechOpen published books.
\n\nIn addition to BKCI, IntechOpen covers a number of important discipline specific databases as well, such as Thomson Reuters’ BIOSIS Previews.
\n\nACCESS
\n\nThe need for up to date information available at the click of a mouse is one thing that sets IntechOpen apart. By developing our own technologies in order to streamline the publishing process, we are able to minimize the amount of time from initial submission of a manuscript to its final publication date, without compromising the rigor of the editorial and peer review process. This means that the research published stays relevant, and in this fast paced world, this is very important.
\n\nYOUR WORK, YOUR COPYRIGHT
\n\nThe utilization of CC licenses allow researchers to retain copyright to their work. Researchers are free to use, adapt and share all content they publish with us. You will never have to pay permission fees to reuse a part of an experiment that you worked so hard to complete and are free to build upon your own research and the research of others. The Edited Volume helps bring together research from all over the world and compiles that research into one book - accessible for all. The research presented in chapter one can inspire the author of chapter three to take his or her research to the next level. It is about sharing ideas, insights and knowledge.
\n\nCan collaboration be inspired by a publishing format? At IntechOpen, the answer is yes. The way the research is published, the way it is accessed, it’s all part of our mission to help academics make a greater impact by giving readers free access to all published work.
\n\nOur Open Access book collection includes:
\n\n3,332 OPEN ACCESS BOOKS
\n\n107,564 INTERNATIONAL AUTHORS AND ACADEMIC EDITORS
\n\n113+ MILLION DOWNLOADS
\n\nPUBLISHING PROCESS STEPS
\n\nSee a complete overview of all publishing process steps and descriptions here.
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\n\nTo view current Open Access book projects that are Open for Submissions visit us here.
\n\nNot sure if this is the right publishing option for you? Feel free to contact us at book.department@intechopen.com.
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I am also a member of the team in charge for the supervision of Ph.D. students in the fields of development of silicon based planar waveguide sensor devices, study of inelastic electron tunnelling in planar tunnelling nanostructures for sensing applications and development of organotellurium(IV) compounds for semiconductor applications. I am a specialist in data analysis techniques and nanosurface structure. 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After obtaining a Master's degree in Mechanical Engineering, he continued his PhD studies in Robotics at the Vienna University of Technology. Here he worked as a robotic researcher with the university's Intelligent Manufacturing Systems Group as well as a guest researcher at various European universities, including the Swiss Federal Institute of Technology Lausanne (EPFL). During this time he published more than 20 scientific papers, gave presentations, served as a reviewer for major robotic journals and conferences and most importantly he co-founded and built the International Journal of Advanced Robotic Systems- world's first Open Access journal in the field of robotics. Starting this journal was a pivotal point in his career, since it was a pathway to founding IntechOpen - Open Access publisher focused on addressing academic researchers needs. Alex is a personification of IntechOpen key values being trusted, open and entrepreneurial. Today his focus is on defining the growth and development strategy for the company.",institutionString:null,institution:{name:"TU Wien",country:{name:"Austria"}}},{id:"19816",title:"Prof.",name:"Alexander",middleName:null,surname:"Kokorin",slug:"alexander-kokorin",fullName:"Alexander Kokorin",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/19816/images/1607_n.jpg",biography:"Alexander I. Kokorin: born: 1947, Moscow; DSc., PhD; Principal Research Fellow (Research Professor) of Department of Kinetics and Catalysis, N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow.\r\nArea of research interests: physical chemistry of complex-organized molecular and nanosized systems, including polymer-metal complexes; the surface of doped oxide semiconductors. He is an expert in structural, absorptive, catalytic and photocatalytic properties, in structural organization and dynamic features of ionic liquids, in magnetic interactions between paramagnetic centers. The author or co-author of 3 books, over 200 articles and reviews in scientific journals and books. He is an actual member of the International EPR/ESR Society, European Society on Quantum Solar Energy Conversion, Moscow House of Scientists, of the Board of Moscow Physical Society.",institutionString:null,institution:{name:"Semenov Institute of Chemical Physics",country:{name:"Russia"}}},{id:"62389",title:"PhD.",name:"Ali Demir",middleName:null,surname:"Sezer",slug:"ali-demir-sezer",fullName:"Ali Demir Sezer",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/62389/images/3413_n.jpg",biography:"Dr. Ali Demir Sezer has a Ph.D. from Pharmaceutical Biotechnology at the Faculty of Pharmacy, University of Marmara (Turkey). 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Focus of his research activity is drug delivery, physico-chemical characterization and biological evaluation of biopolymers micro and nanoparticles as modified drug delivery system, and colloidal drug carriers (liposomes, nanoparticles etc.).",institutionString:null,institution:{name:"Marmara University",country:{name:"Turkey"}}},{id:"61051",title:"Prof.",name:"Andrea",middleName:null,surname:"Natale",slug:"andrea-natale",fullName:"Andrea Natale",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:null},{id:"100762",title:"Prof.",name:"Andrea",middleName:null,surname:"Natale",slug:"andrea-natale",fullName:"Andrea Natale",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"St David's Medical Center",country:{name:"United States of America"}}},{id:"107416",title:"Dr.",name:"Andrea",middleName:null,surname:"Natale",slug:"andrea-natale",fullName:"Andrea Natale",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Texas Cardiac Arrhythmia",country:{name:"United States of America"}}},{id:"64434",title:"Dr.",name:"Angkoon",middleName:null,surname:"Phinyomark",slug:"angkoon-phinyomark",fullName:"Angkoon Phinyomark",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/64434/images/2619_n.jpg",biography:"My name is Angkoon Phinyomark. I received a B.Eng. degree in Computer Engineering with First Class Honors in 2008 from Prince of Songkla University, Songkhla, Thailand, where I received a Ph.D. degree in Electrical Engineering. My research interests are primarily in the area of biomedical signal processing and classification notably EMG (electromyography signal), EOG (electrooculography signal), and EEG (electroencephalography signal), image analysis notably breast cancer analysis and optical coherence tomography, and rehabilitation engineering. I became a student member of IEEE in 2008. During October 2011-March 2012, I had worked at School of Computer Science and Electronic Engineering, University of Essex, Colchester, Essex, United Kingdom. In addition, during a B.Eng. I had been a visiting research student at Faculty of Computer Science, University of Murcia, Murcia, Spain for three months.\n\nI have published over 40 papers during 5 years in refereed journals, books, and conference proceedings in the areas of electro-physiological signals processing and classification, notably EMG and EOG signals, fractal analysis, wavelet analysis, texture analysis, feature extraction and machine learning algorithms, and assistive and rehabilitative devices. I have several computer programming language certificates, i.e. Sun Certified Programmer for the Java 2 Platform 1.4 (SCJP), Microsoft Certified Professional Developer, Web Developer (MCPD), Microsoft Certified Technology Specialist, .NET Framework 2.0 Web (MCTS). 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