By L. Onatas. John Jay College of Criminal Justice. 2018.
Dermoelectroporation controls the average pulse value by providing a continuous reversed polarity current female viagra 100 mg on line pregnancy early signs and symptoms. Varying the pulse shape according to the skin’s speciﬁc electrical impedance promotes the transdermal delivery of drugs as in classical iontophoresis buy female viagra 50mg free shipping womens health institute taos, despite the fact that the average current is zero. Moreover, macromolecules are transdermally delivered from an iontophoretic device. The absence of a temporary pH change allows the use of microdermabrasion before dermoelectroporation application. Pretreatment with microdermabrasion promotes the transdermal delivery rate and ensures repeatability as a result of the standardization of the thickness and permeability of the stratum corneum. The pulse shapes operate at a much lower energy and penetrate even under high skin-impedance conditions. A capacitor is charged to a value of some hundred volts and then discharged on the tissue to be electroporated. If the load is purely resistive, the voltage waveform obtained is an exponential decay curve. The maximum peak current occurs at the begin- ning of the discharge and the value is given by the ratio, charge voltage/load resistance. Unfortunately, the living skin has a signiﬁcant capacitance in parallel to the resistive load. This means that at the beginning of the discharge the resulting current is very high for a short period of time until the skin capacitance is charged to a value close to the voltage of the electroporation capacitor; then the exponential current decay curve occurs. Moreover, the skin impedance and the resulting current are functions of several variables—skin condition, pressure of the electrode on the skin, moisture, stratum corneum thickness, etc. This occurs despite the fact that the current in the in vivo applica- tion is a critical parameter, because skin damage occurs when the current density is too high. The electric circuit based on the capacitor is intrinsically unsafe because the peak value current is unpredictable. Strict international rules limit the maximum current density ROLE OF DERMOELECTROPORATION & 293 applicable to the skin and this limits the practical application of classical electroporation. For this reason the authors experimented with a different type of circuit that is intrinsically safe, verifying if transdermal transport of molecules and macromolecules occurs as in clas- sical electroporation despite the limited density of current. The circuit uses an inductor instead of a capacitor as a means to store energy and obtain a pulse with exponential decay equivalent to the one obtained by the circuit based on a capacitor. The circuit with the inductor is able to deliver a pure resistance with the same waveform of the circuit based on the capacitor. The advantage occurs when the load is a resistance in parallel with a capacitance as in the living skin. In this case, at the beginning of the discharge, the value of the current is the maximum value during the pulse. The voltage waveform is variable and depends on the characteristics of the load. The parameters chosen are 2 mA, maximum peak pulse current of 5 mA (value at the beginning of the discharge), and 2 a drug-soaked electrode surface of 3. Such values are capable on a 20 kX load to generate a peak voltage value of 200 V. To maximize the effect and add an iontophoretic transport mechanism, the pulses have been grouped in bursts at a frequency of 2200 Hz. The burst is composed of a sequence of negative and positive symmetric pulses and no direct current is applied. To avoid the stimulation of muscles under the electrode area, a novel electrode geometry has been chosen. The return electrodes are designed around the active electrode soaked with the ionic substance to be transder- mally delivered. In this way the current ﬂows only inside the dermis and no current ﬂows into the muscles under the skin. The treatment requires bimonthly or monthly sessions—a total of four to eight—of a procedure consisting ﬁrst of superﬁcial microdermabrasion intended for the removal of the corneus layer and for vascularization. These crystals are then used with a manual massage to promote further mechanical smoothing of the skin.
Neurology 61: 736–740 Kieseier BC generic female viagra 100 mg menopause natural remedies, Hartung HP (2003) Therapeutic strategies in the Guillain-Barre syndrome 50 mg female viagra otc breast cancer ornament. Semin Neurol 23: 159–168 292 Chronic inflammatory demyelinating polyneuropathy (CIDP) Genetic testing NCV/EMG Laboratory Imaging Biopsy +++ + – + + Fig. Sural nerve biopsy from a patient with chronic inflam- matory demyelinating poly- neuropathy. A Multiple inflam- matory cells in the endoneuri- um of the sural nerve (black ar- row). B Variation in myelin thickness in the presence of multiple onion bulbs (white ar- row). This is consistent with chronic demyelination and re- myelination Anatomy/distribution Demyelination and Wallerian degeneration of peripheral nerves may be fea- tures of CIDP, although the spectrum of pathological findings is wide and varied. Symptoms CIDP is characterized by progressive weakness and sensory loss. Clinical syndrome/ Exam reveals symmetric, proximal and distal weakness with sensory loss and signs areflexia. The course may be progressive, monophasic, or relapsing, and usually takes 12–24 months for symptoms to become noticeable. Autonomic and cranial nerve dysfunction is possible but not common. Pathogenesis 30% of patients have an antecedent event (viral infection, immunization, surgery). CIDP is believed to be an autoimmune disorder, with elements of both cell-mediated and humoral immunity. Diagnosis Laboratory: CSF protein is elevated with < 10 WBC/m3. Serum and urine protein electro- phoresis are used to exclude a monoclonal gammopathy. Distal latency exceeds 130% of the upper limit of normal in 2 or more motor nerves. There is evidence of unequivocal temporal dispersion or conduc- tion block on proximal stimulation, consisting of a proximal-distal amplitude ratio < 0. Imaging: Bone survey or scan is useful to exclude multiple myeloma. Nerve roots can appear enlarged, but imaging of the nervous system is only warranted when concomitant myelopathy is suspected. Biopsy: Nerves may on occasion show inflammatory infiltrate, with focal myelin loss on teased fiber analysis (Fig. Numerous other conditions can appear as a distal sensory motor neuropathy, Differential diagnosis including HIV neuropathies, hexacarbon abuse, porphyria, diphtheria, arsenic or lead intoxication, uremic polyneuropathy, diabetic polyradiculoneuropathy, and meningeal carcinomatosis. The diagnosis of a patient with idiopathic CIDP will require that numerous other conditions be excluded by examination and laboratory testing. Therapy – Once the patient is stable or improved, the prednisone is tapered to a q. The dose should be maintained at a steady state if the patient relapses. The chance for recovery is generally good with most patients showing response Prognosis to therapy. The course may be relapsing, especially when treatment is inade- quate. Treatment may be required for years to prevent relapses. Ad Hoc Subcommittee of the American Academy of Neurology AIDS Task Force (1991) References Research criteria for diagnosis of chronic inflammatory demyelinating polyneuropathies (CIDP): report from the Ad Hoc Subcommittee of the American Academy of Neurology AIDS Task Force. Neurology 41: 617–618 Hahn AF, Bolton CF, Zochodne D, et al (1996) Intravenous immunoglobulin in chronic inflammatory demyelinating polyneuropathy. A double blind placebo controlled, cross over study. Brain 119: 1067–1077 294 Hughes RA, Bensa S, Willison H, et al (2001) Randomized controlled trial of intravenous immunoglobulin versus oral prednisolone in chronic inflammatory polyradiculoneuropa- thy. Ann Neurol 50: 195–201 Kissel JT (2003) The treatment of chronic inflammatory demyelinating radiculoneuropathy. Semin Neurol 23: 169–180 Molenaar DSM, Vermeulen M, de Haan RJ (2002) Comparison of electrodiagnostic criteria for demyelination in patients with chronic inflammatory demyelinating polyneuropathy (CIDP).
These people become emotionally “ﬂat” the ventral amygdalofugal ﬁbers buy female viagra 50 mg cheap breast cancer jewelry, projecting to the dorso- and lose some hard-to-deﬁne human quality in their inter- medial nucleus (see Figure 75A and Figure 75B) female viagra 50 mg online womens health upland ca. In addition, such an individual may pathway brings “emotional” information to the thalamus. This pathway passes through the anterior limb of the treatment of pain in terminal cancer patients, as part the internal capsule, between the head of the caudate of the palliative care of an individual. After the surgery, nucleus and the lentiform nucleus (see Figure 26). The the individual is said to still have the pain but no longer ﬁbers course in the white matter of the frontal lobes. There may even be a reduced demand its extension to this prefrontal cortex, speciﬁcally the for pain medication such as morphine. Again, other orbital and medial portions of the frontal lobe; this has approaches to pain management are now used. Widespread areas of the limbic system and association cortex of the frontal lobe, PHINEAS GAGE particularly the medial and orbital portions, are involved with human reactions to pain, particularly to chronic pain, Phineas Gage has become a legendary ﬁgure in the annals as well as the human experiences of grief and reactions of the history of the brain. In brief, Gage was working on to the tragedies of life. CLINICAL ASPECT — PSYCHOSURGERY The steel peg is said to have penetrated the orbit and the frontal lobes, much like the surgical procedure described The projection of the dorsomedial nucleus to the prefron- above, emerging through the skull. He survived and lived tal cortex has been implicated as the key pathway that is on; his personality changes, which have been well docu- interrupted in a now-banned surgical procedure. Before mented, subsequent to this accident concur with those the era of medication for psychiatric disorders, when up described following a frontal lobotomy. The story of Phin- to one-half of state institutions were ﬁlled with patients eas showing a reconstruction of his injury and describing with mental illness, a psychosurgical procedure was the changes in his personality can be found in Kolb and Whishaw (see the Annotateed Bibliography). In addition, in humans, there is an internal state of discomfort to being HYPOTHALAMUS cold, or hungry, or thirsty, which we call an emotional response. Additional connections are required for the behavioral (motor) activities, and the accompanying psy- THE NEURAL HYPOTHALAMUS chological reaction requires the forebrain, as well as the This diagram, which is the same as Figure 71, highlights limbic cortical areas (to be discussed with the limbic sys- the hypothalamus, one of the core structures of the limbic tem synthesis at the end of this section). The third ventricle is situated between part of the limbic system. They receive a direct input from the two diencephalic parts of the brain, (e. A number of nuclei that control is a prominent ﬁber tract, the medial forebrain bundle, the anterior pituitary gland are located in the medial group. Other directly with the posterior pituitary via the pituitary stalk ﬁber bundles connect the hypothalamus with the “limbic (see Figure 15A and Figure 15B). Stimulation of particular small ADDITIONAL DETAIL areas of the hypothalamus can lead to a variety of behav- The Habenula (not illustrated) iors (e. The habenular nuclei are a group of small nuclei situated Certain basic drives (as these are known in the ﬁeld at the posterior end of the thalamus on its upper surface of psychology), such as hunger (feeding), thirst (drinking), (see Figure 11). The pineal gland is attached in this region sex (fornication), and body temperature, are regulated (see Figure 9A). Many of the receptor mecha- There is another circuit whereby septal inﬂuences are nisms for these functions are now known to be located in conveyed to the midbrain. The ﬁrst part of the pathway is highly specialized hypothalamic neurons. The hypothala- the stria medullaris (note the possible confusion of termi- mus responds in two ways — as a neuroendocrine struc- nology), which connects the septal nuclei (region) with ture controlling the activities of the pituitary gland and as the habenular nuclei. The stria medullaris is found on the a neural structure linked to the limbic system. From the habenular nuclei, In its neural role there are small areas of the hypo- the habenulo-interpeduncular tract descends to the mid- thalamus that act as the “head ganglion” of the autonomic brain reticular formation, mainly to the interpeduncular nervous system, inﬂuencing both sympathetic and para- nucleus located between the cerebral peduncles (see mid- sympathetic activities. The response to hunger or thirst or brain cross-section, Figure 65B).
Back pain is predominantly a problem of the working age group buy female viagra 100mg fast delivery womens health 63031. The proportion of people in this age group is destined to fall (Figure 2 discount female viagra 100mg free shipping womens health 022013. However, with the overall increase in the world population even within this age group, and the trends outlined above in back pain prevalence, it seems likely that the burden of back pain (and of other regional and chronic pain conditions) is likely to rise. Changes in disease course Most episodes of back pain are self-limiting and not incapacitating. Over half of all episodes of back pain last less than one week and 90% of individuals have recovered within eight weeks. However, beyond this time recovery becomes less and less likely. Back pain that has persisted beyond 12 months is likely to be intractable. A number of developed countries have introduced guidelines for the management of acute back pain which are directed at the concept of early mobilisation and pain management using cognitive-behavioural therapy approaches. There is no evidence as yet that this has had any impact on the community burden of disease. Regrettably, the burden of back pain is set to increase, particularly if those in the less developed countries adopt the same attitude to pain as is prevalent in the more developed countries. Conclusions The burden of all four conditions highlighted in this chapter is likely to increase over the next few decades. Part of the increase will be due 34 FUTURE BURDEN OF BONE AND JOINT CONDITIONS to the absolute increase in the size of the world’s population, but more is attributable to changes in the age structure of the population. Given that these changes in population structure are probably inevitable, can anything be done to reduce the predicted burden of pain and disability? Some opportunities for primary and secondary prevention have been highlighted and will be developed in subsequent chapters of this book. Population based strategies require action by governments and education of the public about the likely benefits. None of these changes, particularly changes in lifestyle, can be mandated and so “ownership” of the policies by the community is essential. It has become the fashion to set targets for health improvement prior to the introduction of programmes of primary, secondary or tertiary prevention in the hope that these will motivate all concerned. In January 2000 the United States Department of Health and Human Services released Healthy People 2010, the nation’s health goals for this decade. The WHO for Europe has decided to be more focussed and has issued 21 targets for the twenty-first century;38 this also may be too many, and many regions have chosen to focus on only five to ten. The British Government has selected only four – cancer, coronary heart disease and stroke, accidents and mental illness. Musculoskeletal disorders are omitted from the focussed British approach, but this may be of no consequence if an overambitious approach would bring no gain. Many of the changes in lifestyle advocated for the prevention of cancer and heart disease would also benefit bone and joint health. It is important not to fall into the trap of thinking that improvements in musculoskeletal health can only be achieved in the context of such political plans. It remains to be seen whether target setting actually makes any difference to health. The Global Burden of Disease 1990 Project found that there are many parts of the world for which there are no data on musculoskeletal disorders occurrence, and this needs to be rectified. There is a particular need for information from South America and Africa. However, it is not necessary for every town to conduct its own survey, nor for every patient to be monitored intensively with multiple outcome measures. One anxiety about the enormous scope of the US plan38 is that it will divert resources from health improvement activities to the tracking of outcomes. Much is currently known about the effective primary, 35 BONE AND JOINT FUTURES secondary and tertiary prevention of musculoskeletal disorders and could be implemented within existing resources. Additional resources are needed and a proportion should be directed at the acquisition of further data, but the majority should be directed at alleviating and preventing the problem itself.
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