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Search Results: 1 - 10 of 87374 matches for " Piotr W. Olejniczak "
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Botulinum Toxin Injections for Simple Partial Motor Seizures Associated with Pain
Edward C. Mader Jr.,Bruce J. Fisch,Nicole R. Villemarette-Pittman,Piotr W. Olejniczak,Michael E. Carey
Case Reports in Medicine , 2012, DOI: 10.1155/2012/295251
Abstract: Intractable epilepsy with painful partial motor seizures is a relatively rare and difficult disorder to treat. We evaluated the usefulness of botulinum toxin to reduce ictal pain. Two patients received two or four botulinum toxin (BTX) injections at one-to-two-month intervals. Patient 1 had painful seizures of the right arm and hand. Patient 2 had painful seizures involving the left foot and leg. Injections were discontinued after improved seizure control following resective surgery. Both patients received significant pain relief from the injections with analgesia lasting at least two months. Seizure severity was reduced, but seizure frequency and duration were unaffected. For these patients, BTX was effective in temporarily relieving pain associated with muscle contraction in simple partial motor seizures. Our findings do not support the hypothesis that modulation of motor end-organ feedback affects focal seizure generation. BTX is a safe and reversible treatment that should be considered as part of adjunctive therapy after failure to achieve control of painful partial motor seizures.
Typical Spike-and-Wave Activity in Hypoxic-Ischemic Brain Injury and its Implications for Classifying Nonconvulsive Status Epilepticus
Edward C. Mader Jr, Nicole R. Villemarette-Pittman, Sergei V. Kashirny, Lenay Santana-Gould and Piotr W. Olejniczak
Clinical Medicine Insights: Case Reports , 2012, DOI: 10.4137/CCRep.S9861
Abstract: Introduction: Typical spike-and-wave activity (TSWA) in the electroencephalogram (EEG) indicates idiopathic generalized epilepsy (IGE). IGE-related nonconvulsive status epilepticus (NCSE) is typically an absence status epilepticus (ASE). ASE and TSWA respond dramatically to benzodiazepines. Patients with no history of seizure/epilepsy may develop ASE “de novo” in the context of an acute brain disorder. However, we are aware of only one previous case of de novo ASE with TSWA in hypoxic-ischemic brain injury. Case presentation: A 65-year-old man, with congestive heart failure and history of substance abuse, survived cardiorespiratory arrest after 18 minutes of cardiopulmonary resuscitation. Post-resuscitation, the patient was in coma with intact brainstem function. Toxicology was positive for cocaine and marijuana. Eyelid myoclonus suggested NCSE, which was initially treated with lorazepam and fosphenytoin. EEG monitoring showed sustained TSWA confirming NCSE and demonstrating de novo ASE (the patient and his family never had seizure/epilepsy). The TSWA was resistant to lorazepam, levetiracetam, and low-dose midazolam; it was eliminated only with midazolam at a dose that resulted in burst-suppression (≥1.2 mg/kg/hour). Conclusion: This is an unusual case of TSWA and hypoxic-ischemic brain injury in a patient with no history of seizure/epilepsy. The TSWA was relatively resistant to benzodiazepines suggesting that cerebral hypoxia-ischemia spared the thalamocortical apparatus generating TSWA but impaired the cortical/thalamic inhibitory circuits where benzodiazepines act to suppress TSWA. Albeit rare, ‘post-hypoxic’ TSWA offers us some valuable insights for classifying and managing nonconvulsive status epilepticus.
Laparoscopic Radical Cystectomy: a 5-year review of a single institute's operative data and complications and a systematic review of the literature
Aboumarzouk, Omar M.;Drewa, Tomasz;Olejniczak, Pawel;Chlosta, Piotr L.;
International braz j urol , 2012, DOI: 10.1590/S1677-55382012000300006
Abstract: objective: we aim to evaluate our experience and results with laparoscopic radical cystectomy and conduct a systematic review of studies reporting on 50 or more procedures. materials and methods: between february 2006 and march 2011, a prospective study in a single institute on patients with bladder cancer who underwent laparoscopic radical cystectomy was conducted. a search of the cochrane library, pubmed, medline, and scopus databases was conducted for studies reporting on 50 or more laparoscopic radical cystectomy procedures to compare with our results. results: sixty men and five women underwent laparoscopic radical cystectomy during the 5-year study period. thirty-nine patients were submitted to ileal conduits, 24 to neobladders, and two patients to ureterocutaneostomies. the mean operative time was 294 ± 27 minutes, the mean blood loss was 249.69 ± 95.59 millilitres, the mean length of hospital stay was 9.42 ± 2 days, the mean morphine requirement was 3.69 ± 0.8 days. the overall complication rate was 44.6% (29/65). however, the majority of the patients with complications (90% (26/29)) had minor complications treated conservatively with no further surgical intervention needed. the literature search found seven studies, which reported on their institutions' laparoscopic radical cystectomy results of 50 or more patients. generally, our results were similar to other reported studies of the same calibre. conclusion: laparoscopic radical cystectomy is a safe and efficient modality of treatment of bladder cancer. however, it comes with a steep learning curve, once overcome, can provide an alternative to open radical cystectomy.
Mono-, bi- and tri- graphene layers deposited on conductive Au/Cr/SiO2/Si substrate studied by scanning tunnelling spectroscopy
Z. Klusek,P. Dabrowski,P. Kowalczyk,W. Kozlowski,P. Blake,M. Szybowicz,T. Runka,W. Olejniczak
Physics , 2008,
Abstract: Graphene devices require electric contacts with metals, particularly with gold. Scanning tunneling spectroscopy studies of electron local density of states performed on mono-, bi- and tri- graphene layer deposited on metallic conductive Au/Cr/SiO2/Si substrate shows that gold substrate causes the Fermi level shift downwards which means that holes are donated by metal substrate to graphene which becomes p-type doped. These experimental results are in good accordance with recently published density function theory calculations. The estimated positions of the Dirac point show that the higher number of graphene layers the lower Fermi level shift is observed.
Nanoscale Phenomena Occurring during Pyrolysis of Salix viminalis Wood
Aleksandra W. Cyganiuk,Roman Klimkiewicz,Andrzej Olejniczak,Anna Kucińska,Jerzy P. ?ukaszewicz
Journal of Materials , 2013, DOI: 10.1155/2013/206952
Abstract: Selective utilisation of unique properties of Salix viminalis wood enables preparation of materials of nanotechnologic properties. Thermal decomposition of lignin-cellulose organic matter results in the formation of a nanostructured porous carbon matrix (charcoal). Narrowed pore size distribution (PSD) in the subnanometer range allows to consider the charcoals as carbon molecular sieves (CMSs), which are capable of separating even chemically inert gases like neon, krypton, and nitrogen. High tolerance of Salix viminalis to heavy metal ions enables enriching living plant tissues with metal ions like lanthanum and manganese. Such ions may later form LaMnO3 with parallel transformation of plant tissues (organic matter) to carbon matrix using a heat treatment. In this way, one gets a hybrid material: a porous carbon matrix with uniformly suspended nanocrystallites of LaMoO3. The crystallites are in the catalytically active phase during the conversion of n-butanol to heptanone-4 with high yield and selectivity. 1. Introduction Thermal treatment of biomass (including wood) is usually seen as an ordinary technological process. However, in some cases, this process may trigger some phenomena, which, doubtlessly, should be regarded as a part of widely understood nanotechnology, because of the properties of materials obtained during pyrolysis. The current research is aimed to prove that the terms “nanomaterial,” “nanotechnology,” “nanoscale” should not be exclusively considered in relation to artificial, synthetic materials obtained by sophisticated methods. We demonstrate on selected examples that nanoscale effects are achievable by particular treatments of natural products and/or by utilisation of phenomena, which occur in living plants. The presented examples relate to the plant called Salix viminalis. Salix viminalis is one of so-called short-rotation coppice [1], planted as an easily renewable source of energy [2]. There are almost no other cases of utilising Salix viminalis beside those related with energy or phytoremediation [3] of water and soil. Apart from its proved high tolerance to heavy metal ions, Salix viminalis grows very fast in the mild climate zone, yielding hard wood in large quantities per a single hectare of crop area [4]. The high agricultural yield of Salix viminalis may considerably reduce the cost of products obtained from this material, provided that proposed methods are implemented in the industrial use. 1.1. Carbon Molecular Sieves Carbon molecular sieve (CMS) is often defined as a carbonaceous material of a narrowed pore size
Commentary on the superconducting and magnetic properties of the ruthenocuprates
Klamut Piotr W
PMC Physics B , 2010, DOI: 10.1186/1754-0429-3-2
Abstract: Presented in this commentary is a short discussion of the superconducting and magnetic properties of selected compounds of ruthenocuprates, with an emphasis given to the RuSr2GdCu2O8 compound. The ruthenocuprates, which form derivative class in the cuprate family, continue raising interest for there evidenced presence of magnetic ordering in the sublattice of Ru ions, which in polycrystalline samples of RuSr2GdCu2O8 sets at Tm ≈ 132 K, and at low temperatures may become simultaneous with the superconducting phase (Tc,max ≈ 50 K)-all that in the crystal structure derived from well known REBa2Cu3O7 cuprate superconductor. While several here invoked recent results advocate for an intrinsically inhomogeneous nucleation of superconductivity within this structure, the formed superconducting phase carries potential of maintaining substantial anisotropy with then interesting consequence for probing the cuprate characteristic superconductivity in these compounds. PACS Codes: 74.72.-h, 74.25.Ha, 74.81.-g
Poincaré inequalities and rigidity for actions on Banach spaces
Piotr W. Nowak
Mathematics , 2011,
Abstract: The aim of this paper is to extend the framework of the spectral method for proving property (T) to the class of reflexive Banach spaces and present a condition implying that every affine isometric action of a given group $G$ on a reflexive Banach space $X$ has a fixed point. This last property is a strong version of Kazhdan's property (T) and is equivalent to the fact that $H^1(G,\pi)=0$ for every isometric representation $\pi$ of $G$ on $X$. The condition is expressed in terms of $p$-Poincar\'{e} constants and we provide examples of groups, which satisfy such conditions and for which $H^1(G,\pi)$ vanishes for every isometric representation $\pi$ on an $L_p$ space for some $p>2$. Our methods allow to estimate such a $p$ explicitly and yield several interesting applications. In particular, we obtain quantitative estimates for vanishing of 1-cohomology with coefficients in uniformly bounded representations on a Hilbert space. We also give lower bounds on the conformal dimension of the boundary of a hyperbolic group in the Gromov density model.
Group Actions on Banach Spaces
Piotr W. Nowak
Mathematics , 2013,
Abstract: We survey the recent developments concerning fixed point properties for group actions on Banach spaces. In the setting of Hilbert spaces such fixed point properties correspond to Kazhdan's property (T). Here we focus on the general, non-Hilbert case, we discuss the methods, examples and several applications.
On coarse embeddability into $\ell_p$-spaces and a conjecture of Dranishnikov
Piotr W. Nowak
Mathematics , 2004, DOI: 10.4064/fm189-2-2
Abstract: We show that the Hilbert space is coarsely embeddable into any $\ell_p$ for $1\le p<\infty$. In particular, this yields new characterizations of embeddability of separable metric spaces into the Hilbert space.
Remarks on quasi-isometric non-embeddability into uniformly convex Banach spaces
Piotr W. Nowak
Mathematics , 2005,
Abstract: We construct a locally finite graph and a bounded geometry metric space which do not admit a quasi-isometric embedding into any uniformly convex Banach space. Connections with the geometry of $c_0$ and superreflexivity are discussed.
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