By M. Elber. University of Memphis. 2018.
As far as the toilet itself is concerned buy aurogra 100mg fast delivery, there are a range of adaptations which may be of help: • Grab bars can be placed on adjacent walls if they are near enough discount 100mg aurogra overnight delivery. The number of different adaptations in this area is increasing rapidly discount aurogra 100 mg visa, so consult your occupational therapist, and look at other sources of information about such products. One of the most trying problems for people with MS is using toilet paper, for the manoeuvre involves considerable movement and dexterity. You might ﬁnd a wet cloth more useful than toilet paper, or you might consider using a squeezy bottle full of (warm! A bidet might be easier, although this may well not ﬁt into your toilet area, can be rather expensive to install, and would need ﬁtting to your water supply. Recently a portable toilet/bidet has been launched that might help people who are worried about travelling and having to deal with conventional, and therefore problematic, toilets elsewhere. You may ﬁnd a toilet that automatically washes and dries you where you are – this is the kind of development that could help many people with MS considerably. Finally, when you are out and about, you can obtain a special key from RADAR for public toilets for disabled people. Dressing aids The problem with dressing, or undressing for that matter, if you have limited movement and dexterity, is not just the difﬁculty but also the time 114 MANAGING YOUR MULTIPLE SCLEROSIS involved in doing them. Although you may be able to accomplish dressing now, in due course it can become such a frustrating and time- consuming process, that you have got little energy left to do anything else. As usual, it is a compromise between attempting to use all the traditional ﬁttings on clothing, and having some which are easier to do up or undo. Of course everyone wants to look good in the clothes they are wearing, and it is often a question of trying to balance being fashionable (or not being unfashionable! Women are in a slightly better position socially than men, in being able to use more accessories, such as jewellery or scarves, to complement whatever clothes they are wearing. In general, tight-ﬁtting clothes are harder to manage than looser ones, whatever kinds of ﬁxings are on them. Try: • large rather than small buttons; • trousers or skirts with elasticated waists; • dressing aids such as dressing sticks and button hooks. One of the trickiest problems for men is that of collars, ties and buttoned shirts. Most of the buttons on shirts can be left done up, so that the shirts can be slipped over the head, If this is a problem, buttonholes can be closed, then the buttons sewn on the outside of the shirt and Velcro strips placed behind them, so that when all the strips are closed it looks as though the shirt is buttoned in the traditional way. As far as ties are concerned, clip-on ones may be easier to use than the usual hand- tied ones or, alternatively, ties can be left already loosely tied and slipped over the head, and then tightened in place. Shoes and socks These cause real problems for people with MS, for they involve a range of movement, together with ﬁne dexterity, both of which can be compromised. One way forward is to investigate the possibility of different ways of tying your shoes. If you are able to reach your shoes, then there are Velcro shoe fastenings, and various devices to tighten laces, and you can learn single-handed tying techniques. If you cannot reach your shoes, then slip-on shoes are a better idea; you could convert your lace-up shoes into slip-ons with elastic laces, if the shoe tongue can be stitched into place. There are a range of other aids available to help pull on (and take off) socks and tights – these usually work through gripping the socks or tights with the end of a hand-operated long-handled tool. MOBILITY AND MANAGING EVERYDAY LIFE 115 Bed aids People with MS often ﬁnd it hard not so much getting into the bed but getting out of it again, in particular, getting up from low, and particularly soft, mattresses. You can try rolling onto your side and, facing the edge of the bed, try pushing yourself up with your underneath arm and, at the same time, swinging your legs over the bed. Once you are sitting up with your legs on the ground, it becomes easier to push up from the bed. There are some other things that you could try: • Cloth strips attached to the mattress will help you to pull yourself up. If these strategies do not work, you could consider a completely or partially electrically operated bed or mattress, but really you should seek advice from your occupational therapist, and/or Social Services Department before embarking on this expensive choice.
On MRI buy 100 mg aurogra fast delivery, acoustic neurinomas are usually isointense to slightly hypointense compared with the pontine tissue on all pulse sequences 100mg aurogra with amex. Enhancement is always evi- dent cheap 100 mg aurogra amex, and is homogeneous in approximately 70% of patients. Peritumoral edema can be seen in 30–35% of cases with larger lesions, and less frequently calcification, cystic change, and hemorrhage Facial nerve neuroma Very rare tumors, but may cause radiographic changes similar to those seen with acoustic neuroma Meningioma of the Meningiomas of the auditory canal may cause erosion Gasserian cavity of the canal, and usually extend to involve the poste- rior surface of the petrous apex Chordomas Vascular lesions – Aneurysm of the intracavernous or intrapetrous carotid artery – Arteriovenous malformation or occlusive disease of the anterior inferior cerebellar artery may cause erosion of the internal auditory canal, giving it a funnel-shaped appearance – Aneurysm at the origin of the internal auditory artery may cause erosion of the canal Tsementzis, Differential Diagnosis in Neurology and Neurosurgery © 2000 Thieme All rights reserved. The earliest radiographic sign is partial to complete destruction of the bony ridge or drum spur of the innermost portion of the roof of the external auditory canal in 80% of cases. The mastoid antrum is enlarged, and may often be sclerotic due to the associated chronic infection. A soft-tissue mass within the tympanic cavity, with de- struction or demineralization of the ossicular chain may also be seen. The latter radiographic changes may also be seen after involvement of the tympanic cavity by granulation tissue due to chronic inflamma- tion, in which case the two are indistinguishable using radiography. On CT scans, cholesteatomas appear as noninvasive, erosive, well-circumscribed lesions in the temporal bone, with scalloped margins. On MRI, they are usually hypointense on T1-weighted images and hyperintense on T2-weighted images Neoplasm – Metastases Hematogenous from the breast, lung, prostate, kid- ney, and other primary neoplasms with osteolytic metastases Tsementzis, Differential Diagnosis in Neurology and Neurosurgery © 2000 Thieme All rights reserved. Diseases Affecting the Temporal Bone 17 – Carcinoma of the This is associated with chronic otitis media in 30% of middle ear cases; pain and bleeding appear late. Bone destruction is seen in 12%, particularly in the temporal fossa of the temporomandibular joint – Glomus jugulare The jugular foramen is enlarged and destroyed; a very tumor vascular lesion – Nasopharyngeal tumor invasion – Rhabdomyosarcoma This is a tumor of children and young adults, and it has a predilection for the nasopharynx. May be very vascular, and may displace the posterior antral wall forward, thus stimulating angiofibroma. The signal intensity is similar to that of muscle on T1-weighted images, but becomes hyper- intense on T2-weighted images. Some contrast en- hancement is usual Dermoid cyst Granuloma Histiocytosis X Tuberculosis Rare; may be present without evidence of tuberculosis elsewhere. Lytic lesions, with no sclerotic margins Sphenoid wing Meningioma (CT, MRI) Benign bone neoplasm E. Tsementzis, Differential Diagnosis in Neurology and Neurosurgery © 2000 Thieme All rights reserved. Congenital Anomalies and Malformations Malformations of the occipital bone Manifestations of occip- These are ridges and outgrowths around the bony ital vertebrae margins of the foramen magnum. Although the bony anomaly occurs extracranially at the anterior margin, it is often associated with an abnormal angulation of the craniovertebral junction, resulting in a ventral compression of the cervicomedullary junction. This particular anomaly is frequently associated with pri- mary syringomyelia and Chiari malformation Basilar invagination – The term "basilar invagination" refers to the pri- mary form of invagination of the margins of the foramen magnum upward into the skull. The radio- graphic diagnosis is based on pathological features seen on plain films, CT, and MRI. Basilar invagina- tion is often associated with anomalies of the noto- chord of the cervical spine, such as atlanto-occipi- tal fusion, stenosis of the foramen magnum and Klippel–Feil syndrome; and with maldevelopments of the epichordal neuraxis such as Chiari malforma- tion, syringobulbia, and syringomyelia. It does not cause any symptoms or signs by itself, but if it is associated with basilar invagina- tion, then obstructive hydrocephalus may occur Condylar hypoplasia The elevated position of the atlas and axis can lead to vertebral artery compression, with compensatory scoliotic changes and lateral medullary compression Tsementzis, Differential Diagnosis in Neurology and Neurosurgery © 2000 Thieme All rights reserved. Abnormalities of the Craniovertebral Junction 19 Malformations of the atlas Assimilation or occipi- Occurs in 0. There is an increased incidence in patients with Down’s syndrome, spondyloepiphysial dysplasia, and Morquio’s syndrome – Hypoplasia/aplasia Segmentation failure of C2–C3 CT: computed tomography; MRI: magnetic resonance imaging. Developmental and Acquired Abnormalities These lesions may be misdiagnosed as: multiple sclerosis (31%), syrin- gomyelia or syringobulbia (18%), tumor of the brain stem or posterior fossa (16%), lesions of the foramen magnum or Arnold–Chiari malforma- tion (13%), cervical fracture or dislocation or cervical disk prolapse (9%), degenerate disease of the spinal cord (6%), cerebellar degeneration (4%), hysteria (3%), or chronic lead poisoning (1%). The chief complaints of patients with symptomatic bony anomalies at the craniovertebral junction are: weakness of one or both legs (32%), occipital or suboccipital pain (26%), neck pain or paresthesias (13%), numbness or tingling of fingers (12%), and ataxic gait (9%). Tsementzis, Differential Diagnosis in Neurology and Neurosurgery © 2000 Thieme All rights reserved.
A Cartesian coordinate system (x1 effective 100 mg aurogra, e x2 aurogra 100 mg lowest price, x3) that is attached to the center of mass of 1 O a slender rod generic aurogra 100 mg with amex. Let us il- lustrate this definition by considering the case of a ball falling from a height h. Both the velocity and the gravitational force are in the same di- rection, and therefore the power produced must be positive. The veloc- ity of a ball falling a distance d is given by the equation v 5 (2 g d)1/2 in which v is the speed of the spherical ball and d is the distance of the fall. Thus we obtain the following equation for the power produced by gravity: P 5 mg [2 g (h 2 y)]1/2 in which y is the height of the falling ball at time t and h is the height from which it is falling. Note that the power produced by gravity is not constant but increases with the falling distance. The power exerted by gravity is negative when a ball moves upward in the opposite direction of the gravitational acceleration. Next consider the power produced by the ground reaction force acting on a spherical ball rolling without slip down an inclined plane (see Fig. Because the ball does not slip, the velocity of the point of applica- tion of the ground force (point A) is zero. The power of external forces and couples acting on a rigid body is given by the following equation: P 5S(F? Let us express the velocity of the point of application of F in terms of the velocity of the center of mass and the angular velocity of the body: v 5 vc 1 v 3 r Using this expression in Eqn. Energy Transfers in which SF denotes the resultant force and (SMc) is the resultant mo- ment about the center of mass. According to Newton’s laws of motion, the resultant external force acting on an object is equal to the product of the mass and the acceleration of the center of mass of the object: (SF)? Using the principle of conservation of angular momentum, we can express the resultant external moment in terms of the angular accel- eration and angular velocity. For the planar motion studied in Chapter 4: SMc 5 Ic a in which Ic is the mass moment of inertia with respect to an axis that passes through the center of mass. Although we have derived this equation for a rigid body whose plane of motion is parallel to a plane of symmetry of the body, it can be shown that even in the most general three-dimensional motion, mechanical power of ex- ternal moment acting on a rigid object is equal to the time derivative of the part of the kinetic energy associated with rotation around the cen- ter of mass. Integrating this equation with respect to time, we arrive at the following relation: T2 5 T1 1 W1-2 (8. A sphere of radius a is released from rest and rolls without sliding down an inclined plane (see Fig. Thus, the in- crease in kinetic energy must be equal to the work done on the ball by the gravitational force: T 5 (1/ ) m (v)2 1 (1/ ) (2/5) ma2 (v/a)2 5 0. In this equation, the vector v represents the velocity of the point of application of force F. The position vector connecting the origin O of the inertial reference frame E to the point of application of the force F is termed r and is represented in terms of its projections to the axes of the coordinate system as follows: r 5 x1 e1 1 x2 e2 1 x3 e3 In the following, we present expressions for the work done by various types of forces that are commonly associated with human movement and motion. Work Done by the Gravitational Force The gravitational force acting on a body with mass m is equal to 2mg e2. Gravity does positive work when the body moves downward and negative work when the body moves upward. In the case of conservative forces, the work is expressible in terms of a scalar function V that is called the potential energy: W1-2 5 V(t1) 2 V(t2) (8. The work done by the gravitational force can be expressed as the difference in potential energy between time points t1 and t2: W1-2 52Vg2 1 Vg1 (8. For example, when a ball rolls on a planar surface, the normal force acting on the ball creates no work and therefore does not affect the kinetic energy of the rigid body. If there is no relative movement between the interacting surfaces, the displace- ment is zero, and hence there is no work done by the frictional force. This is important because the frictional forces that enable us to walk or run do zero work during these activities because they act on a point of zero ve- locity. If, however, one body moves relative to the other at the point of contact, friction contributes to the work done by external forces. Work Done by the Spring Forces Consider a spring with spring constant k and force-free length Lo.
What specific intervention or other manoeuvre was being considered and what was it being compared with? It is tem pting to take published statem ents at face value but rem em ber that authors frequently m isrepresent (usually sub- consciously rather than deliberately) what they actually did and overestim ate its originality and potential im portance buy cheap aurogra 100mg online. If you had an incurable disease for which a pharm aceutical com pany claim ed to have produced a new wonder drug order 100mg aurogra fast delivery, you would m easure the efficacy of the drug in term s of whether it m ade you live longer (and cheap aurogra 100 mg on line, perhaps, whether life was worth living given your condition and any side effects of the m edication). You would not be too interested in the level of som e obscure enzym e in your blood which the m anufacturer assured you was a reliable indicator of your chances of survival. The m easurem ent of sym ptom atic (for exam ple, pain), functional (for exam ple, m obility), psychological (for exam ple, anxiety) or social (for exam ple, inconvenience) effects of an intervention is fraught with even m ore problem s. The m ethodology of developing, adm inistering and interpreting such "soft" outcom e m easures is beyond the scope of this book. Controls received neither" "W e m easured the use A system atic literature U noriginal study of vitam in C in the search would have found prevention of the num erous previous studies com m on cold" on this subject (see section 8. Rem em ber that what is im portant in the eyes of the doctor m ay not be valued so highly by the patient, and vice versa. System atic bias is defined by epidem iologists G eoffrey Rose and D avid Barker as anything which erroneously influences the conclusions about groups and distorts com parisons. They should, as far as possible, receive the sam e explanations, have the sam e contacts with health professionals, and be assessed the sam e num ber of tim es using the sam e outcom e m easures. Randomised controlled trials In a RCT, system atic bias is (in theory) avoided by selecting a sam ple of participants from a particular population and allocating them random ly to the different groups. Non-randomised controlled clinical trials I recently chaired a sem inar in which a m ultidisciplinary group of students from the m edical, nursing, pharm acy, and allied professions were presenting the results of several in-house research studies. All but one of the studies presented were of com parative but non-random ised design – that is, one group of patients (say, hospital outpatients with asthm a) had received one intervention (say, an educational leaflet), while another group (say, patients attending G P surgeries with asthm a) had received another 64 ASSESSIN G M ETH OD OLOG ICAL QU ALITY Target populations (baseline state) Allocation Selection bias (system atic Intervention group Control group differences in the com parison groups attributable to incom plete random isation) Performance bias (system atic Exposed to Not exposed to differences in the care intervention intervention provided apart from the intervention being evaluated) Exclusion bias (system atic Follow up Follow up differences in withdrawals from the trial) Detection bias (system atic Outcomes Outcomes differences in outcom e assessm ent) Figure 4. I was surprised how m any of the presenters believed that their study was, or was equivalent to, a random ised controlled trial. In other words, these com m endably enthusiastic and com m itted young researchers were blind to the m ost obvious bias of all: they were com paring two groups which had inherent, self selected differences even before the intervention was applied (as well as having all the additional potential sources of bias listed in Figure 4. As a general rule, if the paper you are looking at is a non- random ised controlled clinical trial, you m ust use your com m on sense to decide if the baseline differences between the intervention and control groups are likely to have been so great as to invalidate any differences ascribed to the effects of the intervention. Cohort studies The selection of a com parable control group is one of the m ost difficult decisions facing the authors of an observational (cohort or case-control) study. Few, if any, cohort studies, for exam ple, succeed in identifying two groups of subjects who are equal in age, gender m ix, socioeconom ic status, presence of co-existing illness, and so on, with the single difference being their exposure to the agent being studied. In practice, m uch of the "controlling" in cohort studies occurs at the analysis stage, where com plex statistical adjustm ent is m ade for baseline differences in key variables. U nless this is done adequately, statistical tests of probability and confidence intervals (see section 5. The best outcom e (in term s of prem ature death) lies with the cohort who are m oderate drinkers. But can we assum e that teetotallers are, on average, identical to m oderate drinkers except for the am ount they drink? As we all know, the teetotal population includes those who have been ordered to give up alcohol on health grounds ("sick quitters"), those who, for health or other reasons, have cut out a host of additional item s from their diet and lifestyle, those from certain religious or ethnic groups which would be underrepresented in the other cohorts (notably M uslim s and Seventh D ay Adventists), and those who drink like fish but choose to lie about it. The details of how these different features of "teetotalism " were controlled for by the epidem iologists are discussed elsewhere. Case-control studies In case-control studies (in which, as I explained in section 3. A good exam ple of this occurred a few years ago when a legal action was brought against the m anufacturers of the whooping cough (pertussis) vaccine, which was alleged to have caused neurological dam age in a num ber of infants. A control was an infant of the sam e age and sex taken from the sam e im m unisation register, who had received im m unisation and who m ay or m ay not have developed sym ptom s at som e stage.
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