1,721,470 research outputs found
Endoscopic Surgery of the Lacrimal Drainage System
No full textThis manual covers all aspects of endoscopic surgery of the lacrimal drainage system. Step-by-step descriptions are provided of endoscopic dacryocystorhinostomy (DCR) and its use in revision surgery, accompanied by numerous helpful photographs and anatomical drawings. In addition, clear flow charts are included to aid in diagnostic and surgical decision making and identify surgical indications. Essential information is provided on anatomy, physiology and pathology and an individual chapter is devoted to imaging of the lacrimal drainage system. Further topics include lacrimal probes and stents, potential complications of surgery, and endoscopic DCR in the pediatric age group. This book will assist the practitioner in negotiating the steep learning curve involved in gaining the skills needed to perform endoscopic surgery of the lacrimal drainage system, which offers significant advantages in terms of avoidance of external incisions and maintenance of the lacrimal pump.
Il ruolo della famiglia nella genesi e nella gestione delle imprese degli immigrati
No full textLe analisi e le riflessioni contenute nel presente articolo intendono contribuire all’approfondimento della conoscenza del ruolo della famiglia nella genesi e nella gestione delle imprese degli immigrati. Nella prima parte dell’articolo è riportata una rassegna, inevitabilmente parziale, della letteratura sull’imprenditoria degli immigrati all’interno dei migration studies. Dato lo scarso rilievo assunto dal rapporto famiglia/impresa all’interno dei migration studies, per individuare un quadro teorico e un apparato concettuale utile all’obbiettivo della ricerca, si è fatto riferimento ad un secondo filone di studi, i family firm studies. All’interno di questi ultimi, si sono, quindi, individuate una specifica prospettiva, la family embeddedness perspective, e precise categorie di risorse famigliari (capitale sociale famigliare, capitale umano famigliare e capitale finanziario famigliare) utili per fare emergere le caratteristiche del rapporto famiglia/impresa degli immigrati. All’interno di tale prospettiva e attraverso l’operativizzazione di tali categorie, si è proceduto ad analizzare un database che raccoglie i dati rilevati attraverso 200 interviste strutturate face to face con altrettanti titolari d’impresa immigrati. I dati contenuti nel database hanno consentito di impostare due distinte traiettorie d’indagine: la rilevazione delle rappresentazioni che gli intervistati hanno del ruolo della loro famiglia nella genesi e nella gestione dell’impresa; l’individuazione delle modalità di utilizzo da parte degli immigrati dei diversi tipi di capitale famigliare. In particolare, gli obbiettivi specifici che sono stati perseguiti sono: in primo luogo, rilevare l’importanza che gli imprenditori immigrati attribuiscono alle risorse riconducibili al capitale famigliare nella fase di avviamento e nella gestione d’impresa; in secondo luogo, descrivere la relazione che intercorre tra l’importanza attribuita dagli imprenditori immigrati alle risorse riconducibili alla famiglia e l’importanza attribuita dagli stessi alle risorse riconducibili ad altri tipi di capitale; in terzo luogo, individuare gruppi di comportamento omogeneo rispetto all’utilizzo delle risorse riconducibili ai diversi tipi di capitale che la famiglia può fornire
A 1D CNN for high accuracy classification and transfer learning in motor imagery EEG-based brain-computer interface
Full text linkObjective.Brain-computer interface (BCI) aims to establish communication paths between the brain processes and external devices. Different methods have been used to extract human intentions from electroencephalography (EEG) recordings. Those based on motor imagery (MI) seem to have a great potential for future applications. These approaches rely on the extraction of EEG distinctive patterns during imagined movements. Techniques able to extract patterns from raw signals represent an important target for BCI as they do not need labor-intensive data pre-processing.Approach.We propose a new approach based on a 10-layer one-dimensional convolution neural network (1D-CNN) to classify five brain states (four MI classes plus a 'baseline' class) using a data augmentation algorithm and a limited number of EEG channels. In addition, we present a transfer learning method used to extract critical features from the EEG group dataset and then to customize the model to the single individual by training its late layers with only 12-min individual-related data.Main results.The model tested with the 'EEG Motor Movement/Imagery Dataset' outperforms the current state-of-the-art models by achieving a99.38¬curacy at the group level. In addition, the transfer learning approach we present achieves an average accuracy of99.46%.Significance.The proposed methods could foster the development of future BCI applications relying on few-channel portable recording devices and individual-based training
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
A retrospective study showing the misuse of prophylactic antibiotics in patients undergoing appendectomy and cholecystectomy
No full textObjective: The aim of this study was to assess the appropriateness of antibiotic prophylaxis in a sample of patients undergoing appendectomy and cholecystectomy. Background: Inappropriate use of antibiotics occurs in all medical specialties; incorrect antibiotic prophylaxis for surgical procedures has been shown to be one of the most serious misuses of these drugs. Methods: A retrospective review of antibiotic prophylaxis was conducted in 7 departments of surgery in an urban, public, university-affiliated, 2000-bed Italian general hospital. Prophylaxis was considered appropriate if it was performed at the induction of anesthesia and consisted of a single intravenous injection of an antibiotic recommended by the guidelines or, according to a less stringent criterion, if limited to 24-hour coverage. The charts of 138 patients who underwent surgery for appendectomy (n = 55) or cholecystectomy (n = 83) in 1997 were randomly selected for review from a total of 676 patients undergoing the procedures that year. Results: A total of 5 antibiotics were used for prophylaxis in appendectomy and 7 in cholecystectomy. Among the patients given antibiotics prophylactically, these drugs were used inappropriately in 63.6% of patients who underwent appendectomy and in 75% of those who underwent cholecystectomy. Reasons for inappropriateness were an excessive duration of treatment, incorrect timing of administration, inadequate antibacterial spectrum of the drug used, and unnecessary combination of 2 antibiotics. Conclusions: In this Italian general hospital, prophylactic use of antibiotics was inappropriate in the majority of patients undergoing appendectomy or cholecystectomy
Atlas of craniocervical Junction and cervical spine surgery
No full textAtlas of craniocervical Junction and cervical spine surger
Post-Covid-19 Airway Stenosis: Tracheal Resection-Anastomosis Using The Tritube® Ventilation
Full text link: We present a video of a tracheal resection and anastomosis performed on a patient affected by A-shaped tracheal stenosis. The condition was a consequence of a percutaneous tracheostomy following a Sars-Cov2 infection. Airways management during the surgery was obtained with the Tritube®, an innovative device with a very small lumen that combines stable lung parameters and good visualization of surgical field. Laryngoscope, 2023
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