115 research outputs found
Łącznotkankowe pozostałości po usuniętych elektrodach drogą przezżylną
We present a case report of fibrotic tissue reflecting lead course after percutaneous pacemaker lead extraction.
Kardiol Pol 2011; 69, 6: 619–62
LASER ULTRASONIC MEASUREMENT OF MECHANICAL DECAY IN LIMESTONE CAUSED BY FREEZETHAW CYCLES
In this article, an innovative new method of non-destructive testing for estimating the sensitivity of limestone is presented. An advantage of the laser ultrasonic structuroscopy method is the time and the quality, due to which less tests are necessary for an analysis of rock properties. Limestone is measured with an innovative structural control method, which shows a good qualitative and quantitative agreement with the basic structural analysis
Symptomatic cavernous hemangioma of fronto-parietal region of the brain in a young female patient – a case report
Introduction: Cavernous hemangioma is a bening blood vessel malformation that can be located in the central nervous system. Although most patients who are found to have a CNS hemangioma are asymptomatic, the entity can cause a wide spectrum of symptoms including severe ones like epileptic seizures, stroke, diplopia, dysfasia or cognitive functions’ disorders.
Case report: A 21-year-old female patient was admitted to the Department Of Neurology due to transient vision impairment, dysfasia, headache and tinnitus. Physical examination revealed no focal neurological signs. A brain MRI was performed. A cavernous hemangioma of 7-8 mm in size was found. The patient was examined by neurosurgeon as well, who did not qualify her for an immediate surgery.
Discussion: Although cavernous hemangiomas are often asymptomatic, sometimes they can be a causative factor of different neurological symptoms. One should always take into account a possibility of cerebral hemangioma presence in young patients that suffer from headaches, tinnitis or have impaired vision
Validation of the Polish language version of the SF-36 Health Survey in patients suffering from lumbar spinal stenosis
Introduction and objective. Patient-reported outcome (PRO) questionnaires have become the standard measure for
treatment effectiveness after spinal surgery. One of the most widely used generic PROs is the SF-36 Health Survey. The aim
of this study was to specifically focus on validating the SF-36 Health Survey to confirm that the tool is an acceptable and
psychometrically robust measure to collect HRQoL data in Polish patients with spinal stenosis.
Materials and Methods. Patients were eligible if they were above 18 years of age and had been qualified for spine surgery
of the lumbar region due to either discopathy or non-traumatic spinal stenosis. All patients filled-in the Polish version of
the SF-36 and a demographic questionnaire. Standard validity and reliability analyses were performed.
Results. 192 patients (83 women – 43.2%) agreed to take part in the study (mean age: 57.5±11.4 years). In 47 patients
(24.5%), using MRI, ossification of the ligamenta flava were found. Cronbach’s alpha coefficients showed positive internal
consistency (0.70–0.92). Interclass correlations for the SF-36 ranged from 0.72 – 0.86 and proved appropriate test-retest
reliability. Satisfactory convergent and discriminant validity in multi-trait scaling analyses was seen.
Conclusions. The Polish version of the SF-36 is a reliable and valid tool for measuring HRQoL in patients with spinal
stenosis. It can be recommended for use in clinical and epidemiological settings in the Polish population. However, caution
is warranted when interpreting the results of the ‘role limitations due to physical health problems’ and the ‘role limitations
due to emotional problems’ scales because of floor and ceiling effects
Telecommunications network design and max-min optimization problem, Journal of Telecommunications and Information Technology, 2005, nr 3
Telecommunications networks are facing increasing demand for Internet services. Therefore, the problem of telecommunications network design with the objective to maximize service data flows and provide fair treatment of all services is very up-to-date. In this application, the so-called maxmin fair (MMF) solution concept is widely used to formulate the resource allocation scheme. It assumes that the worst service performance is maximized and the solution is additionally regularized with the lexicographic maximization of the second worst performance, the third one, etc. In this paper we discuss solution algorithms for MMF problems related to telecommunications network design. Due to lexicographic maximization of ordered quantities, theMMF solution concept cannot be tackled by the standard optimization model (mathematical programme). However, one can formulate a sequential lexicographic optimization procedure. The basic procedure is applicable only for convex models, thus it allows to deal with basic design problems but fails if practical discrete restrictions commonly arriving in telecommunications network design are to be taken into account. Then, however, alternative sequential approaches allowing to solve non-convex MMF problems can be used
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