By B. Kapotth. University of Texas at El Paso. 2018.
The alcoholism genes identified so antiprotozoal drugs such as metronidazole cheap 375 mg keftab free shipping, inhibit ALDH2 far—ALDH2 and ADH2—were discovered individually and thereby cause a flushing reaction after alcohol consump- but act additively when they co-occur (vide infra) order keftab 500mg mastercard. Therefore, the protective effect of ALDH2 genotypes To dissect the multiple genetic influences on alcoholism can be regarded as analogous to protection with disulfiram, vulnerability, it may be necessary or useful to consider sev- as this flushing reaction, severe in homozygotes but milder eral phenotypes representing different aspects of the disease. The allele frequency of the homogeneous clinical groups by severity (dependence or dominantly acting ALDH2-2 is 0. Cloninger (46) divided alcoholics on flushing after alcohol consumption. Their risk of alcoholism a clinical and genetic epidemiologic basis into type 1 (mi- is reduced about four- to tenfold. Approximately 10% of lieu-limited, later onset) and type 2 (early onset, male domi- Japanese are ALDH2-2/ALDH2-2 homozygotes. Thus far, nated, associated with ASPD), thus linking premorbid per- only one alcoholic ALDH2-2/ALDH2-2 homozygote has sonality with alcoholism vulnerability and identifying an been observed across a series of studies in which several alcoholism subtype, type II, with a stronger genetic predis- hundred alcoholics have been genotyped, and that individ- position. This classification is supported by a study involv- ual is the focus of a report (52). Tu and Israel underlying dimensions of liability for alcoholism, drug dis- (53) found that acculturation accounted for some of the orders, ASPD, MD, and GAD that are familially transmit- variance (7–11%) in alcohol consumption for SE Asian ted with moderate specificity: (a) chronic dysphoric symp- males born in North America, although the ALDH2 poly- toms of anxiety and depression, and (b) acting-out behaviors morphism predicted two-thirds of the alcohol consumption and harmful substance use. Also, there are large differences in the prevalence of alcohol dependence in populations that GeneticsOf Alcohol Metabolism have similar ALDH2 allele frequencies. The frequencies of At the present time, the genes for alcohol metabolism are the ADH2 and ALDH2 variants are similar, but the preva- the only genes that are known to have a major impact on lence of alcoholism is 2. Such endophenotypes may be influenced by AND ADH2 GENOTYPES AND THE RISK FOR variation at fewer genes. The brain is relatively inaccessible, ALCOHOLISM IN SOUTHEAST ASIANS (48) so it has been more difficult to obtain biochemical and ALDH2 ADH2 Protective Factor physiologic measures that identify more specific genetic sub- types as was done decades ago for certain other common, ∗2/∗2 ∗2/∗2, ∗1/∗2, or ∗1/∗1 High ∗ ∗ ∗ ∗ ∗ ∗ broadly defined diseases (e. Association studies 2/ 1 2/ 2 or 2/ 1 ∗ ∗ of candidate genes, although laborious, have far greater 1/ 1 ∗1/∗1 ∗2/∗2 power for untangling the genetics of complex diseases than ∗2/∗1 linkage analysis (60). New approaches, including TDT ∗1/∗1 None (transmission disequilibrium test) analysis (61,62) and eth- nic matching using informative markers (63), have been ADH, alcohol dehydrogenase; ALDH, aldehyde dehydrogenase. Korea, suggesting that there are interactions with other ge- Rodent Models: Quantitative Trait Locus netic and environmental factors (54). Analyses The ADH2 genotype has been shown to be an indepen- Rodent strains are inbred to produce large numbers of ge- dent factor contributing to the risk of alcoholism (50) and netically identical animals that can be maintained under acts additively with the ALDH2-2 variant (Table 99. A controlled environmental conditions and intercrossed when pilot study found that the ADH2-2 allele accounts for 20% required. The neurobiology of reinforcement and reward to 30% of the alcohol intake variance between two groups of was elucidated largely through behavioral and anatomic light-drinking and heavy-drinking Israeli Jews, and suggests studies in rodents. Several behavioral traits in rodents are that the relatively high frequency of the ADH2-2 allele continuous and polygenic. Each of the multiple genes re- might contribute to the generally perceived lower levels of sponsible for such quantitative traits is termed a quantitative alcohol consumption and increased sensitivity to alcohol trait locus (QTL). Several QTLs may influence one trait, observed among Jews (55,56). In one report, The knockout of an individual gene in the mouse can reveal the presence of ADH2-3 in African-American mothers a potential role for the equivalent (homologous) gene in the drinking during pregnancy was associated with a lower rate human. Several QTLs for alcohol-associated behaviors have been identified in mice by using recombinant inbred strains that differ widely with respect to many alcohol-related traits, and DETERMINING THE GENETIC BASIS OF by follow-up studies using interstrain crosses and congenics. VULNERABILITY TO ALCOHOLISM The behaviors for which QTLs have been mapped include acute and chronic alcohol withdrawal sensitivity, alcohol Genetic analysis of complex disorders is complicated by the consumption, and alcohol-associated hypothermia. Buck et fact that any single gene is likely to account for only a small al. To detect subtle genetic effects, large genes influencing alcohol withdrawal severity can be as- samples are needed. The four methods (59) most widely signed to QTLs on mouse chromosomes 1, 4, and 11. The used are (a) linkage analysis: the inheritance pattern of phe- locus on chromosome 11 accounted for 12% of the genetic notypes and genotypes are elucidated in pedigrees; (b) allele variability in withdrawal liability and was near the genes for sharing methods: affected relatives are compared to detect the 2, 1, and 6 subunits of GABAA receptors. Further- excess genotype sharing; (c) association (case-control) stud- more, a 2 subunit polymorphism has now been found to ies: unrelated affected and unaffected individuals are com- be genetically correlated with alcohol withdrawal severity in pared; (d) analysis of inbred, transgenic, and gene-knockout mice (65). QTLs for alcohol-induced hypothermia, alcohol animals (principally mice and rats). An alternative approach is to employ an endopheno- ships between different phenotypes indicate that the same type as a trait specific marker, e. On Serotonin is involved in behavioral inhibition and is a target chronic exposure to alcohol they show less evidence of toler- for the pharmacologic treatment of alcoholism. These mice also work harder to self-administer cocaine serotonin reuptake inhibitors play a limited role in modify- and show an increased locomotor response, behaving as if ing craving for alcohol and also modify other comorbid already sensitized to the drug (69). The dopamine-related genes that have been knocked out Pathologically low levels of serotonin may contribute to in mice are the DRD4 dopamine receptor, which is located impulsivity and ASPD; for example, a group of criminal, at the site of one of the alcohol QTLs, the D1 and D2 alcoholic Finns was shown to have low cerebrospinal fluid dopamine receptors, the dopamine transporter, and (CSF) 5-hydroxyindolacetic acid (5-HIAA), the lowest lev- VMAT2 (the vesicular transporter). The DRD4 knockout els being found in those who had committed impulsive mice appear to be supersensitive to ethanol, cocaine, and crimes (75).
The IIB performed before surgery in children undergoing appendicectomy showed better 80 | Ultrasound Blocks for the Anterior Abdominal Wall pain scores and less analgesic consumption for 6 hours (Courrèges 1996) purchase 125mg keftab otc. The reduced pain and postoperative morphine consumption effects of ultrasound-guided TAPB in appendicectomy may last for 24 hours (Niraj 2009 (2)) order keftab 750mg. TAPB for laparoscopic appendicectomy in children has been shown to offer no important clinical benefit over local anesthetic port-site infiltration (Sandeman 2011). Ultrasound-guided TAPB has also been evaluated in patients scheduled for major orthopedic surgery and anterior iliac crest harvest for autologous bone graft, with pain abolished for the first 48 hours (Chiono 2010). Upper Abdominal Surgery TAPB is an effective method of blocking the sensory afferents supplying the anterior abdominal wall. However, the classical TAPB may not reliably produce analgesia above the umbilicus (Shibata 2007). The subcostal TAPB involves injection immediately inferior to the costal margin. It has been reported to provide analgesia for incisions extending above the umbilicus (Hebbard 2008). A further development of the subcostal TAPB is the possibility to place a catheter along the oblique subcostal line in the TAM plane for continuous infusion of local anesthetic (Niraj 2011, Hebbard 2010). An ultrasound-guided technique with a Tuohy epidural needle and catheter may be used in this case. Bowel surgery TAPB in adults undergoing large bowel resection via a midline abdominal incision resulted in a significant reduction of pain scores and morphine requirements for the first 24 postoperative hours (21. Other Abdominal Surgery Procedures | 81 TAPB employed for laparoscopic colonic-rectal resections reduces overall postoperative morphine (31. In a retrospective analysis of patients undergoing laparoscopic colonic-rectal resection, an ultrasound-guided TAPB significantly reduced time to the resumption of diet and postoperative hospital stay (Zafar 2010). Ultrasound-guided TAPB in patients undergoing laparoscopic cholecystectomy was associated with a significant reduction in the administration of intraoperative sufentanyl and postoperative morphine (10. Kidney surgery TAPB may reduce pain scores and morphine requirements in patients undergoing renal transplant (Jankovic 2009 (2)). Pain scores and intraoperative opioid need may be reduced for 12 hours (Mukhtar 2010). Kidney transplant recipients receiving IIB and block of T11 to 12 intercostal nerves show reduced postoperative pain and total morphine consumption (12. Subcostal bilateral TAPB with catheters compared to epidural analgesia in adult patients undergoing elective open hepatic-biliary or kidney surgery, provided no significant differences in pain scores at rest and during coughing at 8, 24, 48 and 72 h after surgery. Tramadol consumption was significantly greater in the TAP group (Niraj 2011). After the flap resection, the fibers of the EOM and IOM are separated until the TAM is visualized and local anesthetic is injected bilaterally. Similarly, patients receiving a combination of intercostal, iliohypogastric, ilioinguinal and pararectus blocks for abdominoplasty, showed successful long-term relief of pain and a significantly reduced recovery time, allowing the patient to return to normal activities and work much sooner (Feng 2010). Abdominal Midline Surgery Savino Spadaro, Tommaso Mauri The rectus sheath block (RSB) is safe, easy to learn and perform, and provides the anesthesiologist with another method for effective and long-lasting analgesia for common day-case procedures. The RSB has been described both in adults and in children. Although regional anesthesia techniques are commonly used for postoperative pain control in children, there have been few studies investigating the efficacy of RSB. The technique is recommended for midline laparoscopy where it provides effective analgesia. The onset of analgesia is usually evident within five to ten minutes and provides excellent operative conditions with muscular relaxation (Smith 1988). In children, RSB is a simple block that provides intra- and postoperative analgesia for umbilical, paraumbelical and epigastric hernia repair. Another potential use of RSB is for analgesia after pyloromyotomy. In adults, the RSB may be an alternative to epidural anesthesia for some surgical procedures (Azemati 2005). The RSB has also been described as particularly useful to improve postoperative analgesia after midline laparotomy for umbilical or epigastric hernia repair in high risk patients. However, a pilot study failed to demonstrate the advantage of RSB over infiltration for umbilical hernia repair (Isaac 2006). Local Anesthetics, Pharmacokinetics and Adjuvants Amedeo Costantini The action of local anesthetics is elicited through a specific block of the sodium channels in the peripheral and central nervous system. They block both nerve impulse generation and propagation. Local anesthetics have a particularly high level of activity in the central nervous system and the cardiovascular system. When using local anesthetics for regional anesthesia blocks, patient safety procedures such as a safe vein access, oxygen availability, intensive care equipment, adequate monitoring, immediate availability of general anesthesia, and a sterile procedure should be assured according to national and international guidelines (Bertini 2006). Guidelines for an adequate postoperative pain treatment strategy and management of local anesthetic systemic toxicity must be also taken into account (Savoia 2010, Neal 2010). Dose, Concentration and Volume Correlations The concentration is defined as the mass of a constituent (the local anesthetic) divided by the volume of the mixture (volume of solution) (Table 12.
Structure of histamine H3 receptor negatively coupled to phosphoinositide the human histamine H1 receptor gene purchase keftab 750mg. Biochem J 1998;335: turnover in the human gastric cell line HGT1 750mg keftab overnight delivery. Stable expression in chinese hamster ovary cells high-voltage–activated calcium channels in neurons dissociated 1 reveals the interaction with three major signal transduction from the rat tuberomammillary nucleus. Cloning and func- activity of the histamine H receptor reveals inverse agonism of tional expression of the human histamine H3 receptor. Eur J Pharmacol 2000;387: Pharmacol 1999;55:1101–1107. In: cerebral expression of the guinea pig histamine H3 receptor: Schwartz JC, Haas HL, eds. Subclassification of hista- Wiley Liss, 1992:161–177. The histamine mode in cat and guinea pig LGNd by histamine: possible cellular H3 receptor: a target for new drugs. Amsterdam: Elsevier, 1998: mechanisms of histaminergic control of arousal. Mechanisms of antihistamine-induced 3 and primate [ H]N -methylhistamine binding differ from that sedation in the human brain: H1 receptor activation reduces a of rodents. Three histamine amino acids in the third transmembrane domain. Br J Pharmacol receptors (H1,H2 and H3) visualized in the brain of human 2000;131 :1247–1250. Mapping of hista- ity of native H receptors regulates histamine neurons in brain. Cholinergic nucleus basalis graphic localization in rat brain. Distribution of hista- cortical activation and wakefulness in the cat. J Neurosci 1996; mine H3-receptor binding in the normal human basal ganglia: 16:1523–1527. Molecular cloning of a Eur J Neurosci 1999;11:449–456. Subunit-specific potentiation of recombinant N- USA 1991;88:429–433. Naunyn Schmiedebergs Arch Pharmacol 1991;343: H1 receptor–mediated facilitation of NMDA responses. Histamine phase shifts turnover via muscarinic and nicotinic receptors in the brain. J the hamster circadian pacemaker via an NMDA dependent Neurochem 1990;55:1899–1904. Naunyn Schmiedebergs Arch Pharma- mouse hippocampus. Carter McRee R, Terry-Ferguson M, Langlais PJ, et al. A persistent sodium current nists on neuronal histamine release in the striatum of rats sub- in acutely isolated histaminergic neurons from rat hypothala- jected to acute and chronic treatments with methamphetamine. Okakura-Mochizuki K, Mochizuki T, Yamamoto Y, et al. En- tribute to spontaneous activity in rat tuberomammillary neu- dogenous GABA modulates histamine release from the anterior rons. Glutamatergic current in histaminergic tuberomammillary neurons of the rat regulation of histamine release from rat hypothalamus. Annu Rev of histamine release in rat hypothalamus and hippocampus by Pharmacol Toxicol 1977;17:325–339. Modulation of hista- is caused by a mutation in the hypocretin (orexin) receptor 2 mine synthesis and release in brain via presynaptic autoreceptors gene. GABA -receptor–me- clock in a manner similar to light. B diated control of GABAergic inhibition in rat histaminergic 84. Impaired locomotor activity thalamic slices in vitro. Methods Find Exp Clin Pharmacol 1992; and exploratory behavior in mice lacking histamine H1 recep- 14:35–40. Role of the central histaminergic neuronal system 65. Human histamine in the CNS toxicity of the first generation H1-antagonists. Prog N-methyltransferase pharmacogenetics: common genetic poly- Neurobiol 1997;52:145–157.
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