Analgesia - Revision history

PJ191219: /* Refinement of administration */

2024-04-17T13:05:17Z

Refinement of administration

PJ191219: /* Voluntary oral administration */

2024-04-17T13:02:25Z

Voluntary oral administration

AS191219 at 10:44, 15 April 2021

2021-04-15T10:44:45Z

AS191219 at 10:43, 15 April 2021

2021-04-15T10:43:53Z

AS191219 at 10:43, 15 April 2021

2021-04-15T10:43:07Z

Werenskjold at 22:14, 31 January 2021

2021-01-31T22:14:12Z

AS191219 at 14:55, 16 December 2020

2020-12-16T14:55:54Z

PJ191219 at 09:48, 27 March 2020

2020-03-27T09:48:37Z

PJ191219 at 09:36, 27 March 2020

2020-03-27T09:36:41Z

PJ191219 at 09:19, 27 March 2020

2020-03-27T09:19:08Z

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 ===Refinement of administration===
 Desired and undesired effects of analgetics can largely depend on the administration mode. Additionally, the choice of administration route and interval can affect the animal’s well-being.
-The selection of the administration mode needs to weigh the respective advantages and disadvantages. The decision should consider the frequency of handling and restraint necessary for repeated administration on one hand and the uncertainties in sufficient dosing associated with [[self-administration]] on the other hand. Repeated [[injections]] or [[Oral gavage|oral gavage]] of drugs require restraint of the animal, which can cause additional stress in small laboratory species<ref>{{Cite journal|last=Cinelli|first=Paolo|date=|title=Comparative analysis and physiological impact of different tissue biopsy methodologies used for the genotyping of laboratory mice|url=https://doi.org/10.1258%2F002367707780378113|journal=Laboratory Animals|volume=41:2|pages=|via=|df=2007}}</ref> and might increase existing pain.
+The selection of the administration mode needs to weigh the respective advantages and disadvantages. The decision should consider the frequency of handling and restraint necessary for repeated administration on one hand and the uncertainties in sufficient dosing associated with [[self-administration]] on the other hand. Repeated [[injections]] or [[Oral gavage|oral gavage]] of drugs require restraint of the animal, which can cause additional stress in small laboratory species<ref>{{Cite journal|last=Cinelli|first=Paolo|date=|title=Comparative analysis and physiological impact of different tissue biopsy methodologies used for the genotyping of laboratory mice|url=https://doi.org/10.1258%2F002367707780378113|journal=Laboratory Animals|volume=41:2|pages=|via=|df=2007}}</ref> and might increase existing pain. See also [[Refinement of oral gavage]].
 ====Depot formulations====

@@ Line 27: / Line 27: @@
 ====Voluntary oral administration====
-Voluntary oral administration of analgesia is another promising approach that avoids the negative effects of handling. Several routes of oral administration have been described, such as mixing analgetics with flavored gelatin<ref>{{Cite journal|last=Liles|first=JH|date=|title=Influence of oral buprenorphine, oral naltrexone or morphine on the effects of laparotomy in the rat|url=|journal=Laboratory Animals|volume=32(2)|pages=149-61|via=|df=1998}}</ref>, Nutella<ref>{{Cite journal|last=Goldkuhl|first=R|date=|title=Plasma concentrations of corticosterone and buprenorphine in rats subjected to jugular vein catheterization.|url=https://doi.org/10.1258/la.2010.009115|journal=Laboratory Animals|volume=44(4)|pages=337-43|via=|df=2010}}</ref>, regular diet<ref>{{Cite journal|last=Molina-Cimadevila|first=MJ|date=|title=Oral self-administration of buprenorphine in the diet for analgesia in mice.|url=https://doi.org/10.1177/0023677214532454|journal=Laboratory Animals|volume=48(3)|pages=:216-24.|via=|df=2014}}</ref> or (sweetened) drinking water<ref>{{Cite journal|last=Sauer|first=M|date=|title=Buprenorphine via drinking water and combined oral-injection protocols for pain relief in mice.|url=https://doi.org/10.1016/j.applanim.2016.09.009|journal=Applied Animal Behaviour Science|volume=185|pages=|via=|df=dmy-all2016}}</ref>.
+Voluntary oral administration of analgesia is another promising approach that avoids the negative effects of handling. Several routes of oral administration have been described, such as mixing analgetics with flavored gelatin<ref>{{Cite journal|last=Liles|first=JH|date=|title=Influence of oral buprenorphine, oral naltrexone or morphine on the effects of laparotomy in the rat|url=|journal=Laboratory Animals|volume=32(2)|pages=149-61|via=|df=1998}}</ref>, Nutella<ref>{{Cite journal|last=Goldkuhl|first=R|date=|title=Plasma concentrations of corticosterone and buprenorphine in rats subjected to jugular vein catheterization.|url=https://doi.org/10.1258/la.2010.009115|journal=Laboratory Animals|volume=44(4)|pages=337-43|via=|df=2010}}</ref>, regular diet<ref>{{Cite journal|last=Molina-Cimadevila|first=MJ|date=|title=Oral self-administration of buprenorphine in the diet for analgesia in mice.|url=https://doi.org/10.1177/0023677214532454|journal=Laboratory Animals|volume=48(3)|pages=:216-24.|via=|df=2014}}</ref>, (sweetened) drinking water<ref>{{Cite journal|last=Sauer|first=M|date=|title=Buprenorphine via drinking water and combined oral-injection protocols for pain relief in mice.|url=https://doi.org/10.1016/j.applanim.2016.09.009|journal=Applied Animal Behaviour Science|volume=185|pages=|via=|df=dmy-all2016}}</ref> or the [[MDA (micropipette-guided drug administration) Method]].
 These studies in mice and rats have shown that several analgetics are efficient when administered orally and voluntarily. Nevertheless, oral self-administration has been criticized as being less effective than subcutaneous treatment in rats<ref>{{Cite journal|last=Thompson|first=AC|date=|title=Lack of analgesic efficacy in female rats of the commonly recommended oral dose of buprenorphine.|url=|journal=J Am Assoc Lab Anim Sci|volume=45(6)|pages=13-6|via=|df=dmy-all}}</ref>. Reduced bioavailability caused by metabolizing of the drug before it reaches systemic circulation is a known obstacle in this administration route<ref>{{Cite journal|last=Brewster|first=D|date=|title=The Systemic Bioavailability of Buprenorphine by Various Routes of Administration|url=|journal=J Pharm Pharmacol|volume=33(8)|pages=500-6|via=|df=1981}}</ref>. Moreover, latency to ingestion as well as the total amount ingested by the animals, especially during the resting phase, is difficult to anticipate and is clearly variable for each individual. Thus, voluntary ingestion protocols might be applicable only when pain is mild, or in combination with drug injections, at least during the resting phase of rodents.

← Older revision		Revision as of 10:44, 15 April 2021
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	These studies in mice and rats have shown that several analgetics are efficient when administered orally and voluntarily. Nevertheless, oral self-administration has been criticized as being less effective than subcutaneous treatment in rats<ref>{{Cite journal\|last=Thompson\|first=AC\|date=\|title=Lack of analgesic efficacy in female rats of the commonly recommended oral dose of buprenorphine.\|url=\|journal=J Am Assoc Lab Anim Sci\|volume=45(6)\|pages=13-6\|via=\|df=dmy-all}}</ref>. Reduced bioavailability caused by metabolizing of the drug before it reaches systemic circulation is a known obstacle in this administration route<ref>{{Cite journal\|last=Brewster\|first=D\|date=\|title=The Systemic Bioavailability of Buprenorphine by Various Routes of Administration\|url=\|journal=J Pharm Pharmacol\|volume=33(8)\|pages=500-6\|via=\|df=1981}}</ref>. Moreover, latency to ingestion as well as the total amount ingested by the animals, especially during the resting phase, is difficult to anticipate and is clearly variable for each individual. Thus, voluntary ingestion protocols might be applicable only when pain is mild, or in combination with drug injections, at least during the resting phase of rodents.		These studies in mice and rats have shown that several analgetics are efficient when administered orally and voluntarily. Nevertheless, oral self-administration has been criticized as being less effective than subcutaneous treatment in rats<ref>{{Cite journal\|last=Thompson\|first=AC\|date=\|title=Lack of analgesic efficacy in female rats of the commonly recommended oral dose of buprenorphine.\|url=\|journal=J Am Assoc Lab Anim Sci\|volume=45(6)\|pages=13-6\|via=\|df=dmy-all}}</ref>. Reduced bioavailability caused by metabolizing of the drug before it reaches systemic circulation is a known obstacle in this administration route<ref>{{Cite journal\|last=Brewster\|first=D\|date=\|title=The Systemic Bioavailability of Buprenorphine by Various Routes of Administration\|url=\|journal=J Pharm Pharmacol\|volume=33(8)\|pages=500-6\|via=\|df=1981}}</ref>. Moreover, latency to ingestion as well as the total amount ingested by the animals, especially during the resting phase, is difficult to anticipate and is clearly variable for each individual. Thus, voluntary ingestion protocols might be applicable only when pain is mild, or in combination with drug injections, at least during the resting phase of rodents.

		+	--PJirkof 09:01, 27 March 2020 (UTC)
		+	<references />

−	There are a lot of links on the Norecopa website to [https://norecopa.no/more-resources/anaesthesia-and-analgesia general resources on anaesthesia and analgesia], and to resources [https://norecopa.no/species/fish/anaesthesia-and-analgesia specifically for fish]. [[User:AS191219\|AS191219]] ([[User talk:AS191219\|talk]]) 10:43, 15 April 2021 (UTC)<br />

−	--~~PJirkof 09~~:01, ~~27 March 2020~~ (UTC)	+	There are a lot of links on the Norecopa website to [https://norecopa.no/more-resources/anaesthesia-and-analgesia general resources on anaesthesia and analgesia], and to resources [https://norecopa.no/species/fish/anaesthesia-and-analgesia specifically for fish]. [[User:AS191219\|AS191219]] ([[User talk:AS191219\|talk]]) 10:43, 15 April 2021 (UTC)
−	~~<references />~~

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-There are a lot of links on the Norecopa website to [https://norecopa.no/more-resources/anaesthesia-and-analgesia general resources on anaesthesia and analgesia], and to resources [https://norecopa.no/species/fish/anaesthesia-and-analgesia specifically for fish].<br />
+There are a lot of links on the Norecopa website to [https://norecopa.no/more-resources/anaesthesia-and-analgesia general resources on anaesthesia and analgesia], and to resources [https://norecopa.no/species/fish/anaesthesia-and-analgesia specifically for fish]. [[User:AS191219|AS191219]] ([[User talk:AS191219|talk]]) 10:43, 15 April 2021 (UTC)<br />
 --PJirkof 09:01, 27 March 2020 (UTC)
 <references />

@@ Line 31: / Line 31: @@
 These studies in mice and rats have shown that several analgetics are efficient when administered orally and voluntarily. Nevertheless, oral self-administration has been criticized as being less effective than subcutaneous treatment in rats<ref>{{Cite journal|last=Thompson|first=AC|date=|title=Lack of analgesic efficacy in female rats of the commonly recommended oral dose of buprenorphine.|url=|journal=J Am Assoc Lab Anim Sci|volume=45(6)|pages=13-6|via=|df=dmy-all}}</ref>. Reduced bioavailability caused by metabolizing of the drug before it reaches systemic circulation is a known obstacle in this administration route<ref>{{Cite journal|last=Brewster|first=D|date=|title=The Systemic Bioavailability of Buprenorphine by Various Routes of Administration|url=|journal=J Pharm Pharmacol|volume=33(8)|pages=500-6|via=|df=1981}}</ref>. Moreover, latency to ingestion as well as the total amount ingested by the animals, especially during the resting phase, is difficult to anticipate and is clearly variable for each individual. Thus, voluntary ingestion protocols might be applicable only when pain is mild, or in combination with drug injections, at least during the resting phase of rodents.
 <br />
 --PJirkof 09:01, 27 March 2020 (UTC)
 <references />

← Older revision		Revision as of 22:14, 31 January 2021
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−	Pain in animal experimentation is a major welfare issue, which must be minimized for ethical and legal reasons. Additionally, unrelieved pain may have substantial and poorly controllable effects.	+	Pain in animal experimentation is a major welfare issue, which must be minimized for ethical and legal reasons. Additionally, unrelieved pain may have substantial and poorly controllable effects.

	Pain management includes the choice of anesthesia and analgesia agents, their dose, administration method, duration and frequency of treatment, and a pain-monitoring scheme for each individual animal.		Pain management includes the choice of anesthesia and analgesia agents, their dose, administration method, duration and frequency of treatment, and a pain-monitoring scheme for each individual animal.

@@ Line 3: / Line 3: @@
 Pain management includes the choice of anesthesia and analgesia agents, their dose, administration method, duration and frequency of treatment, and a pain-monitoring scheme for each individual animal.
-The optimal analgesia protocol should relieve pain reliably and lack side effects that might hamper science and animal welfare. In case of surgical or painful procedures, preventive analgesia, defined as pre-, intra- and post-operative analgesia, must be planned to efficiently cover the temporal development of pain and the estimated intensity.
+An optimal analgesia protocol should relieve pain reliably and lack side effects that might hamper science and animal welfare. In case of surgical or painful procedures, preventive analgesia, defined as pre-, intra- and post-operative analgesia, must be planned to efficiently cover the temporal development of pain and the estimated intensity.
 <br />

@@ Line 24: / Line 24: @@
 ====Depot formulations====
-To overcome these problems, and to assure continuous and stress-free administration of analgesia, depot formulations of analgesia for mice and rats have been developed for different drugs (109). These formulations, due to their long release duration, significantly reduce the necessary frequency of drug administration. Respective formulations can on one hand limit the number of necessary injections and associated distress and can on the other hand result in a slow increase in plasma concentrations avoiding high peak concentrations. Thereby adverse effects can be limited, which occur in a concentration-dependent manner. According to recent reports sustained release formulations can improve the tolerability of buprenorphine in rats (112).
+To assure continuous and stress-free administration of analgesia, depot formulations of analgesics have been developed for different drugs<ref>{{Cite journal|last=Foley|first=PL|date=|title=Current options for providing sustained analgesia to laboratory animals.|url=https://doi.org/10.1038/laban.590|journal=LabAnim|volume=43|pages=|via=|df=2014}}</ref>. These formulations, due to their long release duration, significantly reduce the necessary frequency of drug administration. Respective formulations can on one hand limit the number of necessary injections and associated distress and can on the other hand result in a slow increase in plasma concentrations avoiding high peak concentrations.
 ====Voluntary oral administration====
-Voluntary oral administration of analgesia is another promising approach that avoids the negative effects of handling. Several routes of oral administration have been described, such as mixing analgetics with flavored gelatin (113), Nutella (114), regular diet (115) or (sweetened) drinking water (116). These studies in mice and rats have shown that several analgetics are efficient when administered orally and voluntarily. Nevertheless, oral self-administration has been criticized as being less effective than subcutaneous treatment in rats (117). Reduced bioavailability caused by metabolizing of the drug before it reaches systemic circulation is a known obstacle in this administration route (118). Moreover, latency to ingestion as well as the total amount ingested by the animals, especially during the resting phase, as well as gastrointestinal motility is difficult to anticipate and is clearly variable for each individual. Thus, voluntary ingestion protocols might be applicable only when pain is mild, or in combination with drug injections, at least during the resting phase of rodents (116).
+Voluntary oral administration of analgesia is another promising approach that avoids the negative effects of handling. Several routes of oral administration have been described, such as mixing analgetics with flavored gelatin<ref>{{Cite journal|last=Liles|first=JH|date=|title=Influence of oral buprenorphine, oral naltrexone or morphine on the effects of laparotomy in the rat|url=|journal=Laboratory Animals|volume=32(2)|pages=149-61|via=|df=1998}}</ref>, Nutella<ref>{{Cite journal|last=Goldkuhl|first=R|date=|title=Plasma concentrations of corticosterone and buprenorphine in rats subjected to jugular vein catheterization.|url=https://doi.org/10.1258/la.2010.009115|journal=Laboratory Animals|volume=44(4)|pages=337-43|via=|df=2010}}</ref>, regular diet (115) or (sweetened) drinking water (116).
 <br />
 --PJirkof 09:01, 27 March 2020 (UTC)

@@ Line 8: / Line 8: @@
 ===Pre-emptive analgesia===
-Pre-emptive analgesia is the administration of an analgetic drug before the nociceptive insult to reduce sensitization of the pain pathways. This procedure is recommended when pain is expected during and after surgical or other invasive procedures because many anesthesia agents, such as isoflurane, do not induce analgesia. Pre-emptive analgesia has the potential to be more effective than a similar analgetic treatment initiated after surgery and to reduce the required analgesia dose.
+Pre-emptive analgesia is the administration of analgesia before the nociceptive insult to reduce sensitization of the pain pathways. This procedure is recommended when pain is expected during and after surgical or other invasive procedures because many anesthesia agents, such as isoflurane, do not induce analgesia. Pre-emptive analgesia has the potential to be more effective than a similar analgetic treatment initiated after surgery and to reduce the required analgesia dose.
 <br />
@@ Line 17: / Line 17: @@
 Multimodal analgesia is a concept that involves different classes of analgetics and/or different sites of drug administration. Administering a combination of two or more drugs with well-established, possibly complementary, pharmacokinetics and mechanism of action has been shown to result in a synergistic or additive effect.
-=== Refinement of administration ===
+<br />
-Desired and undesired effects of analgetics and anesthetics can largely depend on the administration mode. Additionally, the choice of administration route and interval can affect the animal’s well-being.
-The selection of the administration mode needs to weigh the respective advantages and disadvantages. The decision should consider the frequency of handling and restraint necessary for repeated administration on one hand and the uncertainties in sufficient dosing associated with self-administration on the other hand (109). Repeated injections or oral gavage of drugs require restraint of the animal, which can cause additional stress in small laboratory species (110) and might increase existing pain. This may be a substantial confounder of experimental data and may increase inter- and intra-animal variation (111).
+===Refinement of administration===
-==== Depot formulations ====
+====Depot formulations====
 To overcome these problems, and to assure continuous and stress-free administration of analgesia, depot formulations of analgesia for mice and rats have been developed for different drugs (109). These formulations, due to their long release duration, significantly reduce the necessary frequency of drug administration. Respective formulations can on one hand limit the number of necessary injections and associated distress and can on the other hand result in a slow increase in plasma concentrations avoiding high peak concentrations. Thereby adverse effects can be limited, which occur in a concentration-dependent manner. According to recent reports sustained release formulations can improve the tolerability of buprenorphine in rats (112).
-==== Voluntary oral administration ====
+====Voluntary oral administration====
 Voluntary oral administration of analgesia is another promising approach that avoids the negative effects of handling. Several routes of oral administration have been described, such as mixing analgetics with flavored gelatin (113), Nutella (114), regular diet (115) or (sweetened) drinking water (116). These studies in mice and rats have shown that several analgetics are efficient when administered orally and voluntarily. Nevertheless, oral self-administration has been criticized as being less effective than subcutaneous treatment in rats (117). Reduced bioavailability caused by metabolizing of the drug before it reaches systemic circulation is a known obstacle in this administration route (118). Moreover, latency to ingestion as well as the total amount ingested by the animals, especially during the resting phase, as well as gastrointestinal motility is difficult to anticipate and is clearly variable for each individual. Thus, voluntary ingestion protocols might be applicable only when pain is mild, or in combination with drug injections, at least during the resting phase of rodents (116).