By A. Rocko. Southwestern University School of Law.
We have conducted short-term chronic experiments with intermittent current injec- tions via UEAs implanted into the auditory cortex (Rousche and Normann colospa 135 mg visa muscle relaxant medication prescription, 1999) 135 mg colospa visa spasms pronunciation. These experiments, and additional acute experiments conducted in sciatic nerves of cats (Branner et al. We ﬁnd that as little as 5 to 10 mA of current injection (delivered in a 200-ms, biphasic pulse) can evoke behavioral responses or muscle twitches. These current levels are regarded as modest, and pro- vide further evidence of the potential safety and e‰cacy of the UEA as a chronic neural interface. When detailed animal experiments have been performed, we will be in a position to use the UEA in basic human experimentation. Thus, the major barrier to the development of a cortically based visual neuropros- thesis is the demonstration that patterned electrical stimulation of the visual cortex evokes patterned, discriminable percepts. Evidence suggesting that this might be expected to be the case dates back to the early work on cortical electrical stimulation by Brindley (Brindley and Lewin, 1968), and Dobelle (Dobelle and Mladejovsky, 1974). They demonstrated that stimulation of a sequence of ﬁve electrodes in a line evoked the percept of a line. Clearly, this is a rather primitive pattern, but it sup- ports the hypothesis. On the other hand, the organization of the primary visual cortex into numerous superimposed maps makes it di‰cult to fully embrace this hypothesis without more detailed experimentation. Much basic experimentation will have to be conducted with human volunteers before these basic issues can be resolved. If patterned current injections do evoke discriminable patterned percepts in human volunteers, then signiﬁcant engineering problems must still be resolved. The problem of converting a video signal into patterns of electrical stimulation that evoke appro- priate percepts must be addressed. The results described in this chapter (and previ- ously demonstrated by others), allow us to anticipate two potential problems. First, the visuotopic organization of the primary visual cortex illustrated in ﬁgure 3. This suggests that the phosphene space evoked by an implanted electrode array is also not likely to be conformal. If this were the case, then in order to evoke the percept of a line, a complex pattern of electrode excitation would have to be e¤ected. This in turn would require that the signals produced by the video cam- era be remapped to produce a phosphene perceptual space that was conformally re- lated to the visual world encoded by the video camera (Eckmiller, 1997). Of course, if the perceptual nonconformality were not large, then the plasticity of the visual path- ways might be su‰cient to recreate a conformal perceptual space with time and training of the implanted subject. Finally, in order to produce useful visual percepts, one might be required to decompose a recorded video image into an image composed of sets of oriented lines located at speciﬁc points in the visual space. Once the input images are decomposed, a visual percept could be recreated by stimulating the neurons with the correct visuotopic location and the ap- propriately oriented receptive ﬁeld. This notion has been suggested by a number of basic visual neuroscientists and researchers working in the area of visual neuroprosthetics. However, there is little ev- idence to suggest that such a complex signal-processing scheme would be needed to evoke patterned percepts. First, in all the studies done to date on intracortical micro- stimulation, it has generally been observed that microstimulation evokes point per- cepts, not percepts of lines (Brindley and Lewin, 1968; Dobelle and Mladejovsky, 1974; Bak et al. Second, the suggestion is based upon the character of receptive ﬁelds, where the receptive ﬁeld of a neuron reﬂects its pre- synaptic organization. While it is indisputable that the optimum stimulus to excite a cortical complex cell will be a line of a particular orientation, such a line will also excite a complex pattern of activity in the visual cortex. It is this pattern of activity that will be interpreted by higher visual centers, not simply the ﬁring pattern of the Imaging 2-D Neural Activity Patterns 63 single recorded neuron. We believe that this question, as well as the feasibility of this approach to restoring lost visual function, can be fully answered only with human experimentation.
A high- Overall trusted colospa 135mg spasms from anxiety, this herb may be useful in clients who refuse es- fat diet increases the risks of gallbladder disease and per- haps other problems; cigarette smoking increases risks of trogen or have conditions in which estrogen is contraindicated buy colospa 135 mg mastercard muscle relaxant of choice in renal failure. These are most likely to occur in women older than 35 years of age who take oral contraceptives, Choice of preparation depends on the reason for use, desired women who are postmenopausal who take combined route of administration, and duration of action. Conjugated estrogen/progestin hormone replacement therapy, and estrogen (eg, Premarin) is a commonly used oral estrogen women or men who take large doses for cancer. Nursing Diagnoses The choice of combination contraceptive product may be • Disturbed Body Image in women, related to effects of determined by the progestin component. Some progestins are hormone deﬁciency states more likely to cause weight gain, acne, and changes in blood • Disturbed Body Image in men, related to feminizing effects lipids that increase risks of myocardial infarction or stroke. Progestins with minimal an- • Risk for Injury related to increased risks of hypertension drogenic activity are desogestrel and norgestimate; those and gallbladder disease with intermediate activity include norethindrone and ethy- Planning/Goals nodiol; norgestrel has high androgenic effects. In addition, there are long-acting progestin contraceptive preparations The client will: such as IM depot medroxyprogesterone (Depo-Provera) that • Be assisted to cope with self-concept and body image lasts 3 months per injection, intrauterine progesterone that lasts changes 1 year, and levonorgestrel subcutaneous implants (Norplant) • Take the drugs accurately, for the length of time prescribed that last 5 years. In one regimen, the drug is progestin combination, help the client take it accurately. These regimens more and vitamin D in the diet and adequate weight-bearing ex- closely resemble normal secretion of estrogen and avoid pro- ercise to maintain bone strength and prevent osteoporosis. Evaluation • Interview and observe for compliance with instructions Effects of Estrogens and Oral for taking the drugs. Contraceptives on Other Drugs • Interview and observe for therapeutic and adverse drug effects. These drugs may interact with several drugs or drug groups to increase or decrease their effects. Estrogens may decrease the effectiveness of sulfonylurea PRINCIPLES OF THERAPY antidiabetic drugs (probably by increasing their metabolism); warfarin, an oral anticoagulant (by increasing hepatic produc- Need for Continuous Supervision tion of several clotting factors); and phenytoin, an anticon- vulsant (possibly by increasing ﬂuid retention). Estrogens Because estrogens, progestins, and hormonal contraceptives may increase the adverse effects and risks of toxicity with cor- are often taken for years and may cause adverse reactions, ticosteroids, ropinirole, and tacrine by inhibiting their metab- clients taking these drugs need continued supervision by a olism. Ropinirole and tacrine should not be used concurrently health care provider. These examinations should be repeated at least an- drugs is taken concurrently with an oral contraceptive, in- nually as long as the client is taking the drugs. Contra- CHAPTER 28 ESTROGENS, PROGESTINS, AND HORMONAL CONTRACEPTIVES 419 CLIENT TEACHING GUIDELINES Hormone Replacement Therapy General Considerations ✔ Combined estrogen–progestin therapy may increase blood ✔ Estrogen replacement therapy relieves symptoms of meno- sugar levels in women with diabetes. This effect is attrib- pause and helps to prevent or treat osteoporosis. However, a well-done study ✔ Apply skin patch estrogen (eg, Estraderm) to clean, dry reported in 2002 concluded that risks of adverse effects skin, preferably the abdomen. Press the patch tightly for with estrogen–progestin combinations are greater than 10 seconds to get a good seal and rotate sites so that at previously believed. Women with an intact uterus who are least a week passes between applications to a site. Fluid re- symptoms of menopause) should discuss their individual tention and edema may occur and produce weight gain. CLIENT TEACHING GUIDELINES Oral Contraceptives General Considerations ✔ Avoid pregnancy for approximately 3 to 6 months after ✔ Seek information about the use of oral contraceptives. These inserts provide ✔ See a health care provider every 6 to 12 months for blood information about safe and effective use of the drugs. Cigarette smoking increases ✔ Take about the same time every day to maintain effective risks of blood clots in the legs, lungs, heart, or brain. If you forget to take one pill, take it as soon as ✔ Several medications may reduce the effectiveness of you remember. If you do not remember until the next oral contraceptives (ie, increase the likelihood of preg- scheduled pill, you can take two pills at once. These include several antibiotics (eg, ampicillin, miss two pills in a row, you may take two pills for the clarithromycin and similar drugs, rifampin, penicillin V, next 2 days.
When you lift your heels 135mg colospa visa back spasms x ray, you are stimulating six of the main Qi channels in the body cheap 135mg colospa mastercard muscle relaxant on cns, al- lowing a free flow of energy. When finished with this piece, stand quietly and breathe for a minute or so, re- maining calm and aware of your body. Adaptations As with the 18-Movement Qigong Form, adapta- tions for the Eight Pieces of Brocade are quite simple. There is actually a separate Seated Eight Pieces of Bro- cade Qigong Form, but it is a bit more advanced than Photo 74. When performing the Eight Pieces of Brocade sitting down, be aware of the body alignment and posture. The first movement that may cause problems is Form 5, Sway the Head and Swing the Tail, as it is difficult to lean over to the side of a chair without losing your balance. The horseback riding stance for Form 7, Screw the Fists With Fiery Eyes, can be accomplished while seated by simply spreading the legs apart as far as is com- fortable, remembering to keep the feet parallel and flat. TLFeBOOK Q igong E xercises / 109 Form 8, Lift Your Heels, becomes problematic when seated. Again, more information on seated adaptations will be forthcoming in Chapter 8. With the principles in mind, however, you will enter into the magi- cal world of healing and relaxation, of spiritual cleansing, and of greater everyday optimism. Remem- ber that the feet should be parallel in order to reduce the stress on the ankles and knees, and although you may normally walk splayfooted, at least for the duration of these exercises try to indulge my taste in foot alignment. The knees should be slightly bent, not as if you are being crushed under a two- ton weight, but comfortably. The main idea is to get away from locking the knees, a common practice in many people. Recall that energy will not flow through a locked joint, and that relaxation is practically impossible to achieve if you are holding tension in your joints. The best way to determine the proper amount of knee bend is to first lock the knees. Then slowly unlock them until the feeling of tension be- hind the knee disappears. The pelvic girdle should be tilted slightly upward and forward, in order to straighten out the lower spine and keep the buttocks from protruding. This helps maintain an even balance and allows the energy to flow throughout the pelvic area. Each little bit of tension that you hold in the shoulders is transmitted throughout the arms and upper chest area, so make sure you relax. The elbows should be slightly bent, the wrists loose, and even the fingers should show a slight curl inward. The head should be lifted up and supported as if a string were pulling upward on the very crown of your head. This further strengthens and straightens the spine, and ensures good posture and alignment. Tuck the chin in slightly, as most people have a tendency to lift their chins along with their heads. The end result of this alignment procedure should be that your gaze is level and calm, with a feeling that your spine is totally at ease and that your upper-body weight is flowing downward through your legs into the ground. Finally, remember to keep the tongue gently touching on the upper palette of the mouth, just behind the front teeth. The most important reason for this unusual tongue placement is again related to energy flow—it bridges two of the main en- ergy channels and allows the Qi to flow in a circuit throughout the body. Remember also periodically during these exercises to stop and check your align- ment and posture. In time, with repeated checking and conscientious practice, these alignment principles will become second nature. Basic Stepping Exercises Cat Stepping Time to brush off that old cat and start stepping out again!
It is effective only when liver glycogen is pres- epinephrine buy colospa 135 mg visa spasms prednisone, growth hormone buy 135mg colospa fast delivery spasms in intestines, and cortisol) work to restore and ent. Some clients cannot respond to glucagon because glycogen maintain blood glucose levels. Glucagon and epinephrine, the stores are depleted by such conditions as starvation, adrenal insufﬁ- dominant counter-regulatory hormones, act rapidly because they ciency, or chronic hypoglycemia. The hyperglycemic effect of are activated as soon as blood glucose levels start declining. People with diabetes who develop hypoglycemia may have Caution is needed in the treatment of hypoglycemia. Although impaired secretion of these hormones, especially those with type the main goal of treatment is to relieve hypoglycemia and restore the 1 diabetes. The client having a hypoglycemic re- cretion of epinephrine also occurs in people who have been action should not use it as an excuse to eat high-caloric foods or treated with insulin for several years. Health care personnel caring for the client creases tachycardia, a common sign of hypoglycemia, and may should avoid giving excessive amounts of glucose. Posthypoglycemia Care The Conscious Client Once hypoglycemia is relieved, the person should have a snack or Treatment of hypoglycemic reactions consists of immediate ad- a meal. Slowly absorbed carbohydrate and protein foods, such as ministration of a rapidly absorbed carbohydrate. For the conscious milk, cheese, and bread, are needed to replace glycogen stores in client who is able to swallow, the carbohydrate is given orally. In addition, the episode needs to include: be evaluated for precipitating factors so that these can be mini- • Two sugar cubes or 1 to 2 teaspoons of sugar, syrup, honey, mized to prevent future episodes. Repeated episodes mean that the or jelly therapeutic regimen and client compliance must be re-evaluated • Two or three small pieces of candy or eight Lifesaver candies and adjusted if indicated. Glitazones tion increases or restores the effectiveness of circulating insulin and results in increased uptake of glucose by pe- • These drugs, pioglitazone and rosiglitazone, are also ripheral tissues and decreased production of glucose by called thiazolidinediones or TZDs and insulin sensitizers. The drugs stimulate exercise or in combination with insulin, metformin, or receptors on muscle, fat, and liver cells. The drugs lower blood sugar by decreasing absorption or production of glucose, by increasing secretion of insulin, or by increasing the effectiveness of available insulin (decreasing insulin resistance). They are also con- should be skipped; if a meal is added, a drug dose traindicated in clients who are hypersensitive to them. Glitazones increase plasma volume and may cause HERBAL AND DIETARY fluid retention and heart failure. In people who did not With most herbs and dietary supplements, even the commonly take a glitazone, 2. Thus, anyone with diabetes who Meglitinides wishes to take an herbal or dietary supplement should consult • Nateglinide and repaglinide are nonsulfonylureas that a health care provider, read product labels carefully, seek the lower blood sugar by stimulating pancreatic secretion of most authoritative information available, and monitor blood insulin. Described • They can be used as monotherapy with diet and exercise below are some products that reportedly affect blood sugar and or in combination with metformin. They are metabolized in the liver; Blood Glucose Levels metabolites are excreted in urine and feces. After a dose of 2 mg is reached, increase dose in increments of 2 mg or less at 1- to 2-week inter- vals, based on blood glucose levels. In combination with insulin, PO 8 mg once daily with the ﬁrst main meal. Alpha-Glucosidase Inhibitors Acarbose (Precose) Delays digestion of carbohydrate foods PO, initially 25 mg, three times daily with ﬁrst bite when acarbose and food are present of main meals; increase at 4- to 8-week intervals in gastrointestinal (GI) tract at the to a maximum dose of 50 mg three times daily same time (for patients weighing under 60 kg) if necessary, depending on 1-h postprandial blood glucose lev- els and tolerance. Clients weighing more than 60 kg may need doses up to 100 mg three times daily (the maximum dose). Miglitol (Glyset) Delays digestion of carbohydrates in the PO, initially 25 mg three times daily with the ﬁrst GI tract bite of each main meal, gradually increased if necessary. Maximum dose, 100 mg three times daily Biguanide Metformin (Glucophage) Older adults are at higher risk for devel- PO, initially 500 mg twice daily, with morning and opment of lactic acidosis, a rare but evening meals; increase dose in increments of potentially fatal reaction. Thus, smaller 500 mg/d every 2–3 weeks if necessary, up to a doses and monitoring of renal function maximum of 3000 mg daily, based on patient are recommended.
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