Browsing by Issue Date
Now showing items 21-40 of 3420
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Acute gastrointestinal complications after open heart surgery
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Publisher and Date:(Asia Publishing Exchange Pte Ltd, 2000)Retrospective analysis revealed that 24 of 4401 adult patients (0.5%) developed severe gastrointestinal complications after open heart surgery during a 3-year period from January 1995. There were 4 women (17%) and 20 men (83%). Mean age was 61.7 ± 2.02 years. Gastrointestinal bleeding (33.3%) mesenteric ischemia (20.8%) pancreatitis (20.8%) hepatic dysfunction (16.7%) and cholecystitis (16.7%) were the most common complications. Mortality was 41.7% (10 patients). During the same period mortality ...
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Sıçan tibia diafiz kırıklarında kalsiyum sülfatın kırık iyileşmesi üzerine etkileri
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Publisher and Date:(2001)Amaç: Kalsiyum sülfat dihidrat (KSD) geçen yüzyıldan beri kemik defektlerinin tamirinde osteokonduktif özelliği nedeniyle başarı ile kullanılan bir biyomalzemedir. Osteokonduktif ajanların kırık kaynamasında da faydalı olabileceği bilinmektedir. Çalışmamızda, KSD’nin kırık iyileşmesi üzerine etkilerini araştırdık. Çalışma planı: Çalışmada 44 adet Wistar cinsi erkek sıçan (ort. ağırlık 255 gr; yaş aralığı 4-6 ay) kullanıldı. Deneye katılan sıçanlar rastgele iki eşit gruba ayrıldı. Kontrol grubunda, ...
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Gonartrozlu olgularda artroskopik debridman ile birlikte intraartiküler sodyum hyaluronat uygulamalarımız ve sonuçlarımız
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Publisher and Date:(Türk Ortopedi ve Travmatoloji Derneği, 2001)Amaç: Diz eklemi dejeneratif değişikliklerinde artroskopik debridman sonrasi eklem içi sodyum hyaluronat uygulamasının klinik sonuçlarını değerlendirmek. Çalışma planı: Artroskopik incelemede medial femoralkondilde kondral patoloji saptanan 57 hastanın 57 dizindeartroskopik debridman uygulandı. Hastaların 19'u erkek, 38'i kadındı (ort. Yaş 56; dağılım 31-75). Outerbridge sıniflamasma göre 26 dizde 1-2. derece (grup A), 31 dizde 3-4. derece (grup B) kondral lezyon saptandı. Debridmanla birlikte ...
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Obstrüktif uyku apne sendromu'unda NCPAP tedavisine uyuma görsel ağırlıklı eğitimin katkısı
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Publisher and Date:(2001)Obstrüktif uyku apne sendromu tedavisinde cerrahi tedavi ile birlikte en sık kullanılan yöntem sürekli pozitif havayolu basıncı (Continuous Positive Airway Pressure: CPAP) ile yapılan tedavidir. CPAP cihazının tedavi seçeneği olarak hasta tarafından kabul edilmesi, gündüz aşırı uyku hali, hastalığın şiddeti, daha önce geçirilmiş cerrahi operasyon gibi birçok farklı nedene bağlıdır. Çalışmamızda, tedavinin kabulünü arttırmak açısından görsel ağırlıklı eğitimin etkileri 196 hasta üzerinde araştırıldı. ...
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Hücresel sinir ağları için gerilim kaynaklı hücre modelleri
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Publisher and Date:(AVES YAYINCILIK, 2001)Bu makalede, bağımsız ve bağımlı gerilim kaynağı tabanlı yeni bir Hücresel Sinir Ağı hücre devresi önerilmiştir. Bu modelde akım kaynaklı Chua ve Yang ‘ın klasik hücre devresinin aksine hücreler için denge noktaları dinamik birimdeki Rx ve Cx’ den bağımsızdırlar. Tam bir hücre devresi tasarlanıp kararlı ve kararsız durumlar için benzetimleri yapılmıstır. Önerilen modelin avantaj ve dezavantajları sonuçlar bölümünde tartışılmıştır.
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Parameter quantization effects in Gaussian potential function neural networks
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Publisher and Date:(World Scientific and Engineering Academy and Society, 2001)In hardware implementations of Gaussian Potential Function Neural Networks (GPFNN) deviation from ideal network parameters is inevitable because of the techniques used for parameter storage and implementation of the functions electronically resulting in loss of accuracy. This loss in accuracy can be represented by quantization of the network parameters. In order to predict this effect theoretical approaches are proposed. One-input one-output GPFNN with one hidden layer have been trained as function ...
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One-stage surgical correction of congenital thoracic lordosis - report of 2 cases
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Publisher and Date:(Taylor & Francis, 2001)
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New modification in otoplasty: Anterior approach
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Publisher and Date:(Lippincott Williams & Wilkins, 2001)After harvesting the conchal cartilage in a large series of secondary rhinoplasties using the anterior approach there was a marked improvement in the shape of the auricle with unnoticeable scarring hidden under the convolution of the antihelix. In this series of 250 cases there were no hypertrophic scars or keloid formations. Based on these favorable results a new modification of otoplasty was developed using only the anterior approach. Between 1992 and 2000 108 otoplasties were performed on 55 ...
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Autonomic cardiac denervation reduces the incidence of atrial fibrillation after coronary revascularization
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Publisher and Date:(Lippincott Williams & Wilkins, 2001)
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Kalça kırıklı-çıkığı (Pipkin tip-IV) ile beraber görülen travmatik aort kapak rüptürü "Olgu sunumu"
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Publisher and Date:(2001)
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Açık kalp cerrahisi sonrası vertebral osteomiyelit mediastinitin önemli bir komplikasyonu
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Publisher and Date:(2001)
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The use of composite stentless valves with graft extension for the treatment of ascending aortic aneurysms
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Publisher and Date:(Elsevier Science Bv, 2001)
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Reconstruction of the superior labial sulcus in secondary bilateral cleft lip deformities: An inverted U-shaped flap
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Publisher and Date:(Lippincott Williams & Wilkins, 2001)A shallow buccal sulcus deformity following bilateral cleft lip repair is not rare. A variety of techniques are described for the secondary reconstruction of a deficient sulcus. Most of these are associated with a variable amount of contraction with subsequent obliteration of the sulcus. In this article an inverted U-shaped flap is described for the secondary reconstruction of the deficient sublabial sulcus. In these patients mobility of the upper lip was severely restricted so orthodontic treatment ...
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Removal of UroLume endoprosthesis using holmium : YAG laser
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Publisher and Date:(Mary Ann Liebert Inc Publ, 2001)A potential complication of UroLume endoprosthesis is migration which may necessitate removal of the stent. Stent removal may be associated with complications such as urethral injury bleeding and external sphincter trauma. We report a patient in whom a holmium:yttrium-aluminium-garnet (Ho:YAG) laser was used to cut the UroLume endoprosthesis into fragments which led to easy and uneventful stent removal.
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Patients with Myelodysplastic Syndromes benefit from therapy with Amifostine Pentoxifylline and Ciprofloxacin with Dexamethasone.
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Publisher and Date:(Amer Soc Hematology, 2001)
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Fault-tolerant training of neural networks in the presence of MOS transistor mismatches
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Publisher and Date:(IEEE-INST Electrical Electronics Engineers Inc, 2001)Analog techniques are desirable for hardware implementation of neural networks due to their numerous advantages such as small size low power and high speed. However these advantages are often offset by the difficulty in the training of analog neural network circuitry. In particular training of the circuitry by software based on hardware models is impaired by statistical variations in the integrated circuit production process resulting in performance degradation. In this paper a new paradigm of ...
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Electrical activity regulates AChR gene expression via JNK PKC zeta and Sp1 in skeletal chick muscle
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Publisher and Date:(Elsevier Science Bv, 2001)Electrical activity of myotubes represses nicotinic acetylcholine receptor (AChR) gene expression. This effect is mimicked by okadaic acid and blocked by tetrodotoxin (TTX) or staurosporine in cultured myocytes [Altiok et al. EMBO J. 16 (1997) 717-725]. In this study we investigated the mechanism of this repression. We show that addition of exogenous phospholipase D (PLD) and C inhibits AChR expression in a manner which parallels that of okadaic acid. Furthermore okadaic acid caused an increase ...
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Does off-pump coronary artery bypass surgery reduce mortality in high risk patients?
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Publisher and Date:(Forum Multimedia Publishing LLC., 2001)Background: The aim of this retrospective study was to compare outcome in two groups of patients who were classified according to their risk groups and underwent coronary revascularization with or without cardiopulmonary bypass. Material and Methods: Between January 1996 and July 2000 480 cases that underwent coronary artery bypass surgery (CABG) were included in a retrospective nonrandomized manner for study. Group I included 210 patients who were revascularized using off-pump techniques. Octopus ...
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A left pulmonary artery aneurysm secondary to pulmonary hypertension
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Publisher and Date:(2001)We report a case of pulmonary trunk aneurysm extending into the left pulmonary artery due to pulmonary hypertension secondary to mitral valve disease. The mitral valve was replaced with a bileaflet mechanical prosthesis. A Dacron graft interposed between main trunk and left pulmonary artery branch and right pulmonary branch attached to the graft in an end-to-side fashion. Early postoperative angiogram revealed a very successful treatment.
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The stability constants of the rare earth complexes with trimetaphosphoric acid
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Publisher and Date:(Soc Chimica Italiana, 2001)The stability constants of the complexes formed between the rare earth metal ions and the anion of trimetaphosphoric acid have been determined at a temperature of 20 degreesC and an ionic strength of mu =0.1 by the ion-exchange equilibrium method. The investigations indicate that stabilities of complexes increased from La to Lu.The highest and the lowest stability constant values (beta) were found to be 7.76 and 3.82 for Lu3+ and La3+ respectively.