By O. Ketil. Alma College.
In vitro proven neurontin 300mg, neurospheres can be differenti- isolated and expanded from fetal germ tissue ated by manipulations into the following cell ES cells and maintained for more than a year types: under the influence of neurotrophins (Geron 1 buy neurontin 400 mg lowest price. An astrocyte lineage by ciliary neuro- tain markers for GABA and tyrosine hydroxy- trophic factor (CNTF) order 800mg neurontin with mastercard, some of the BMPs generic neurontin 300 mg line, lase for monaminergic activity order neurontin 300mg without a prescription. The markers in multi- which offers another potential source of potent cells or precursors for neurons, oligo- cells for implantation. Over time, neural stem cells ers, and the type of stem that identifies a rose can change their propensity to encode neuro- as a rose. Until a definitive panel of genetic genesis over gliogenesis and may respond dif- and protein markers is developed, the poten- 98 Neuroscientific Foundations for Rehabilitation tial for ex vivo and in vivo manipulations of precursors. Neuronal precursors were identified by one PRECURSORS IN ADULT BRAINS investigator in the association cortices of adult Self-renewing cells have been found in all primates, including the prefrontal, inferior mammals in discrete regions of the brain,64 in- temporal, and posterior parietal cortices, but cluding the subgranular zone of the hip- not in sensory areas. The progeny of neural stem cells and exhibit robust LTP, so their contribution may represent a programmed developmental to memory processing may exceed their num- strategy for homeostasis and repair. At least some One of the challenges in reconstructing a are self-renewing multipotential stem cells ca- neural network with neuroblasts is the need pable, given the right signals, of providing the to get the cells to their proper position. Neuroblasts may be recruited, but not easily Retrain circuits, networks, and behaviors. New cells may not migrate, inte- grate, or even survive outside of what their re- These 3Rs evolved from nature, but they are ceptors perceive as a normal signaling envi- coming within the grasp of the rehabilitation ronment. This section examines po- unexpected tool for neural repair, and one of tential interventions. POTENTIAL MANIPULATIONS FOR NEURAL REPAIR Activity-Dependent Changes Clinicians may one day have methods to pro- at Synapses tect injured neurons and white matter, implant needed cells, regenerate axons, and manipulate The storage of information in the brain and the the CNS environment to guide axons to tar- development of neural circuits appear to depend gets. Researchers are still a long way from gen- upon enduring, activity-dependent changes in erating the cells and cues that may recreate the the efficacy of synaptic transmission (see Chap- complex cytoarchitectonic structures for func- ter 1). Table 2–2 lists relationship between learning and memory potential extrinsic manipulations for neural with changes in synaptic strength induced by repair. Unfortunately, the reach appropriate targets, must elaborate ter- dramatic results of highly controlled experi- minal arbors, and must form contacts with ments in homogenous animals, often carried other dendritic shafts and spines to make func- out in ways that do not parallel ischemia and tional connections. Signals from cells and the trauma in patients, have led to only one acute milieu will help support this morphologic feat, clinical intervention for spinal cord trauma and but activity-dependent processes, including one for stroke. Lessons from trying to translate rehabilitation, will consummate the new con- animal studies of neuroprotection into inter- nections into functional units. The building blocks for early school training paradigm and pharmacologic activa- achievement have been called the 3Rs: Read- tion of a cascade that produces dendritic ing, wRiting, and aRithmetic. Chapter 3 tations during childhood education in the 3Rs provides examples from functional imaging can be thought of as a build up of functional studies of cortical representational plasticity wiring driven by cerebral maturation and learn- that parallels changes in impairment and ing. Just as an enriched environment may in a sleeve to force the animal to use its af- lead to synaptogenesis in rodent cortex, an en- fected hand (see Chapters 5 and 9 about riched environment and task-specific behav- forced use strategies for hemiparetic pa- ioral learning after a cortical injury may lead to tients), the representation for the digits and growth of dendrites and dendritic spines and wrist still decreased in size compared to when improved behavior. Nudo and colleagues have developed a corti- The degree of functional improvement in cal injury model in the squirrel monkey that al- successful pellet grasping in the monkeys in lows the study of aspects of plasticity and the these experiments often did not differ sub- effects of rehabilitation training. The model is stantially from the level of success in hand- less a duplication of changes associated with grasping skill achieved by animals that did not stroke than a method to drive cortical repre- train and did not show reorganization in M1. The investigators resented in yet another portion of the sensori- perform tedious cortical microstimulation with motor cortices, probably the ventral premotor glass electrode penetrations into layer 5 of M1 area or cingulate motor cortex or both. They delineate the move- liminary work by Nudo and colleagues, the ment representations for the digits, wrist, and ventral premotor region for digital and wrist proximal arm of the monkeys. Such studies movements also expands in relation to the per- show that motor skills training with the digits centage of loss of the digital area in M1. In- as the monkeys grasp pellets in a small well deed, an increase in synaptogenesis is also leads to an expansion of the representation for found despite the loss of M1 inputs to the ven- the wrist and digits and a reduction in the rep- tral premotor area, perhaps arising from added resentation for the arm in M1 (see Chapter 1). Other investigators have found a rein- M1, within the representation for the digits. Animals that do not re- motor region is injected to block neurotrans- ceive any specific retraining to use the hand mission. Thus, evidence is accumulating to sug- to pick up food pellets evolved a 30% smaller gest that neuronal assemblies in spared regions representational map for the hand. From 10 to 12 hours of ing in poststroke patients adds to this evidence training and greater success in pellet retrieval (see Color Figure 3–5 in separate color insert). When prac- cortex, and retested the representational move- tice for grasping food pellets was delayed for ment map after the animals were given either 2 months after the digit region infarct, the skilled, unskilled, or no retraining for the hand map in the monkeys was larger than af- task. The untreated group Biologic Adaptations and Neural Repair 101 lost the motor map for both proximal and dis- stroke and continued for up to 9 weeks. Thus, in animal models, be- layer 5 pyramidal cells of the forelimb motor havioral and neural compensation are influ- cortex on the nonlesioned side had greater enced by the type of rehabilitation experience.
As you add foods back in order 300mg neurontin with amex, start with the healthiest carbs ﬁrst discount neurontin 100 mg online, the ones that are least likely to spike your blood sugar and send you on a binge neurontin 600 mg low cost. I recommend you eat your chosen carb later rather than earlier in the day discount 800mg neurontin with amex, but not past 3 P quality 600mg neurontin. Having fruit for breakfast, for example, will start your insulin levels off on the wrong foot and lead to cravings later on. This will help keep your motivation strong for the rest of the week, reduce cravings, and prevent bingeing. If you find yourself craving a particularly naughty food, reserve it for your cheat meal. Mindless eating—the demon that will definitely take you off track and undermine your hard work—is waiting for you at every turn. Research shows that the body will turn up the metabo- lism and burn off excess calories during occasional indulgences. So you can safely cheat once a week without seeing ill effects on your waistline. That said, cheating any more than one meal a week could have disastrous consequences. ULTIMATE BODY MAINTENANCE 239 TLFeBOOK SOUND BITES The more your food resembles something that grows in nature, the better. Raw foods are better than cooked because your body must work harder to break them down. Stick to the following Sound Bites when adding the A, B, C, D, E, and F foods back into your diet. ALCOHOL Alcohol is one of the trickiest foods to reintroduce to your diet. After the two- week Ultimate New York Body Plan, your body is like a clean, dry sponge. Finally, it contains far fewer calories and carbs than other types of alcohol. Reserve bread for your cheat meal, and even then, minimize it as much as possible. When having a sandwich, order it open-faced with just one slice of bread. When eating out, choose just one piece of bread from the basket and then send the basket away. Sourdough bread and whole grain bread will break down somewhat more slowly than other varieties, making them slight- ly better choices. STARCHY CARBS Stick to whole grain varieties such as quinoa, lentils, beans, brown rice, and slow-cooking oatmeal. Quinoa in particular is a wonder grain that contains a high amount of protein. Stay away from cups of ﬂavored yogurt, which are two banned foods in one because they contain so much sugar. Although chocolate milk is a big no-no, there are certain brands of cocoa mix that are unsweetened and taste rather delicious. FRUIT AND FAT Choose the lower carb and calorie varieties such as blueberries, strawber- ries, cantaloupe, kiwi, apples, and pears. Stay away from sweet tropical fruits such as papaya, mango, and pineapple. You may also have controlled servings of nuts— about 7 to 10 as a snack. You followed the workout program closely and adhered to the nutrition guidelines, and you are feeling pretty proud of yourself and your accomplishments. The things most difficult to achieve are often the most rewarding to savor. ULTIMATE BODY MAINTENANCE 241 TLFeBOOK One of my first makeovers, Michel, just last week told me that she recently put herself on a modified version of The New York Body Plan because she was feeling like she needed a little ﬁne-tuning. Remember, the Plan is yours for life: It is completely transportable and easy to follow. Sam, another makeover, came into the club today and announced that he has to buy new pants because he not only has maintained his impressive results but has continued to improve on them. Perky butts and sculpted muscles may be your initial motivation, but the ultimate prize is in the sculpting of your mind.
The main tions to the user regarding satisfaction discount 800 mg neurontin mastercard, willing- variable to deﬁne perfect use is adhering to the ness to recommend the method to others and to protocol requirement of not having further acts pay to have access to the method purchase 800 mg neurontin mastercard. Many side- of unprotected intercourse before the start of next effects of regular use contraceptives are reﬂected menses generic neurontin 100mg mastercard. Some of these discontinua- and thus is associated with a delay in the start tion reasons are related to the acceptability of the of menses buy discount neurontin 300 mg line, while levonorgestrel is not discount neurontin 600mg line. For long-acting hormonal provides women under both regimens with a dif- methods, for example, the main discontinuation ferential opportunity to violate the requirement, reason is disturbances in the menstrual bleeding and then the effects of treatment under perfect pattern, largely determined by cultural and social CONTRACEPTION 331 factors. An Egyptian study on the acceptability of pattern was contained in four indices: number once-a-month injectable contraceptives found dif- of bleeding/spotting episodes, mean length of ferences between women discontinuing and those episodes, mean length of bleeding-free intervals continuing in all measures of acceptability. The 90-day reference period method was OTHER ISSUES applied to diary data collected from women treated with Cyclofem, Mesigyna, a low-dose Vaginal Bleeding Patterns levonorgestrel-releasing ring and DMPA taking part in Phase III WHO clinical trials. Among Hormonal contraception is often associated with women using once-a-month injectable and the disturbances in the vaginal bleeding pattern. They may be tolerated by the woman, conducted to investigate the therapeutic effec- and this depends on cultural and behavioural tiveness of one or more treatments for bleeding patterns. An example is given by a trial com- can be achieved by direct questions to women, paring the bleeding pattern of untreated DMPA by their completing menstrual diaries or by 26 users with groups treated with ethinyl oestradiol measuring blood loss. The most used method of analysis of men- strual diaries is the reference period method,78 Equivalence Trials which was standardised by WHO using a 90-day reference period. The following difference in a conventional signiﬁcance test does 10 indices have been recommended:80 number not imply equivalence and a signiﬁcant difference of bleeding/spotting days, number of spotting may correspond to equivalence within a margin days, number of bleeding/spotting episodes, num- of clinical relevance (or margin of equivalence, ber of spotting-only episodes, mean, range and denoted by ). A conﬁdence interval for the maximum value of lengths of bleeding/spotting difference between the methods, on the absolute episodes, mean, range and maximum value or relative scale, on the other hand, is meaningful of lengths of bleeding-free intervals. Therefore no statement of 332 TEXTBOOK OF CLINICAL TRIALS an equivalence hypothesis with the speciﬁcation to detect uncommon but important reactions, can- of the margin of equivalence had been formu- not last long enough to identify long-term effects lated, nor had the sample size been calculated and the experimental group cannot be compared with the objective to demonstrate equivalence. In only a few cases was an equivalence either has no risk compared to a placebo. Another hypothesis stated with a clear speciﬁcation of the limitation of RCTs as a strategy at this stage of margin of equivalence. However, like other regimens containing oestrogen, it is asso- Systematic reviews on contraceptive methods are ciated with side-effects like nausea and vom- available in the Cochrane Library. A systematic review more effective, and it was recommended as a was included in the list if it included comparisons better alternative to the Yuzpe regimen. Another of efﬁcacy, side-effects or acceptability of these example is a trial establishing the equivalence methods or effectiveness of treatments for bleed- between a single dose and a split dose of 1. Subfer- Introductory trials are ﬁeld studies to assess tility trials were not included. The title and if acceptability, effectiveness, continuation of use, necessary the abstract were examined to assess side-effects and service-related needs of a method whether the review was eligible. The 22 reviews in speciﬁc populations, in the context of family 61 satisfying these criteria are listed in Table 20. Such studies The authors conducted 46 meta-analyses with dif- might involve 1000 to 5000 subjects. Strategies for post-registration surveillance of contraceptive drugs are reports The author is greatful to Dr TMM Farley for of adverse reactions, large-scale experimental useful discussions regarding the structure of the studies, formal epidemiological studies and indi- chapter, and to Dr P D Grifﬁn for proof-reading rect correlational studies. Post- The UNDP/UNFPA/WHO/World Bank Spe- registration RCTs are costly, lack sufﬁcient power cial Programme of Research, Development CONTRACEPTION 333 Table 20. Systematic reviews in The Cochrane Database of Systematic Reviews addressing efﬁcacy or side-effects of contraceptive methods Method Stage Review OCs Complete review Biphasic versus monophasic oral contraceptives for contraception Complete review Biphasic versus triphasic oral contraceptives for contraception Protocol Triphasic versus monophasic oral contraceptives for contraception Protocol Skin patch and vaginal ring versus combined oral contraceptives for contraception Protocol Comparison of acceptability of low-dose oral contraceptives containing norethisterone Injectables Protocol Treatment of vaginal bleeding irregularities induced by progestin-only contraceptives Implants Protocol Subdermal implantable contraceptives versus other forms of reversible contraceptives as effective methods of preventing pregnancy EC Complete review Interventions for emergency contraception IUDs Complete review Frameless versus classical intrauterine device for contraception Complete review Hormonally impregnated intrauterine systems (IUSs) versus other forms of reversible contraceptives as effective methods of preventing pregnancy Barrier Complete review Condom effectiveness in reducing heterosexual HIV transmission Complete review Diaphragm versus diaphragm with spermicides for contraception Complete review Sponge versus diaphragm for contraception Protocol Cervical cap versus diaphragm for contraception Protocol Female condom for preventing heterosexually transmitted HIV infection in women Protocol Non-latex versus latex condoms for contraception Lactational Protocol Lactational amenorrhoea for family planning amenorrhoea Sterilisation Complete review Minilaparotomy and endoscopic techniques for tubal sterilisation and Research Training in Human Reproduc- 6. A tion, Department of Reproductive Health and randomized, double-blind study of six combined Research, WHO, Geneva, Switzerland, supported oral contraceptives. A randomized, double-blind study of two combined REFERENCES and two progesterone-only oral contraceptives. Committee for Proprietary Medicinal Products Contraception (1982) 25: 243–52. Contraceptive failure in the induced by 50 mcg and 30 mcg estrogen/proges- United States: a critical review of the literature. International Collaborative Post-Marketing Sur- in family planning: medical eligibility criteria, veillance of Norplant. Koetsawang S, Ji G, Krishna U, Cuadros A, Agents for Fertility Regulation. Microdose intravaginal phase III comparative study of two hormonal con- levonorgestrel contraception: a multicentre clinical traceptive preparations given once-a-month by trial. Contraception (1989) 40(5): Acting Systemic Agents for Fertility Regulation.
They are especially useful in children containing a wax matrix (eg neurontin 300mg free shipping, Slow-K) are effective and better for treatment of diarrhea and may prevent severe ﬂuid and tolerated by most clients than liquid formulations neurontin 300 mg without a prescription. The amount given must be carefully tions of KCl must be diluted before administration to prevent prescribed and calculated to avoid excessive intake buy cheap neurontin 400 mg line. They hyperkalemia neurontin 600mg without prescription, cardiotoxicity generic neurontin 100mg online, and severe pain at the injection should not be used in severe circumstances in which IV ﬂuid site. Dosage must be individualized according to serum potas- and electrolyte therapy is indicated. They must be used cau- sium levels; the usual range is 20 to 60 mEq per 24 hours. They should not be mixed with other electrolyte-containing ﬂuids, such as milk or fruit juices. Sodium Preparations Sodium chloride (NaCl) injection is available in several con- centrations and sizes for IV use. However, deﬁciencies and excesses may be equally How Can You Avoid This Medication Error? Jean Watson, a postoperative patient, has a low serum potassium • Clients with other nutritional deﬁciencies are likely to on her second postoperative day (2. Cur- deﬁciencies are likely to be multiple, with overlapping rently, she has 1000 cc 5% D/. Measures to increase urine output, such as forc- blood cells, hemoglobin, and hematocrit. Reduced val- ing ﬂuids, help to increase output of some minerals in the ues may indicate iron deﬁciency anemia, and further urine and therefore prevent excess states from developing. Next, use oral mineral supple- chloride, and potassium; carbon dioxide content, a ments. Use parenteral supplements only for clear-cut indi- measure of bicarbonate, is also assessed. The use values is sodium, 135 to 145 mEq/L; chloride, 95 to of tap water is contraindicated because it is hypotonic and 105 mEq/L; potassium, 3. For the same reason, only small amounts of ice chips or Nursing Diagnoses water are allowed per hour. Clients often request ice chips • Imbalanced Nutrition: Less Than Body Requirements or water frequently and in larger amounts than desirable; related to mineral–electrolyte deﬁciency the nurse must explain the reason for the restrictions. Planning/Goals • Interview and observe for signs of mineral–electrolyte The client will: deﬁciency or excess. Nutritionists • Take mineral–electrolyte drugs as prescribed usually recommend dietary intake of nutrients rather than phar- • Avoid adverse effects of drug preparations maceutical supplements. In addition, some studies indicate that the people most likely to take dietary supplements are those Interventions who have an adequate diet. In deciding whether to take min- Implement measures to prevent mineral–electrolyte disorders: eral supplements or advise clients to take them, health care • Promote a varied diet. A diet adequate in protein and calo- providers should consider the following factors: ries usually provides adequate minerals and electrolytes. An exception is iron, which is often needed as a dietary • In general, recommended daily doses should not be ex- supplement in women and children. For age and gender groups contain different amounts of clients able to eat, foods high in iron may delay onset of some minerals (eg, postmenopausal women need less iron deficiency anemia, foods high in potassium may iron than younger women). This should be considered prevent hypokalemia with diuretic therapy, and salty in choosing a product. For people rary use in the presence of deﬁciency or a period of unable to eat, IV fluids and electrolytes are usually increased need (eg, pregnancy). In general, oral food intake or tube feeding is taken otherwise because of the risk of accumulation and preferable to IV therapy. CHAPTER 32 MINERALS AND ELECTROLYTES 483 CLIENT TEACHING GUIDELINES Mineral Supplements General Considerations Self- or Caregiver Administration ✔ The best source of minerals and electrolytes is a well- ✔ Take iron preparations with or after meals, with ap- balanced diet with a variety of foods. A well-balanced diet proximately 8 oz of fluid, to prevent stomach upset. Do contains all the minerals needed for health in most peo- not take iron with coffee or other caffeine-containing ple. An exception is iron, which is often needed as a di- beverages, because caffeine decreases absorption. Note that herbal (Take iron and caffeine preparations at least 2 hours preparations of chamomile, feverfew, and St.
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