1,720,979 research outputs found
Difficoltà di gestione terapeutica in un caso di psoriasi e malattia di Charcot-Marie-Tooth
No full textDifficoltà di gestione terapeutica in un caso di psoriasi e malattia di Charcot-Marie-Tooth
No full textRisk of acute postoperative hypertension after topical photodynamic therapy for non-melanoma skin cancer
No full textBackground: Topical photodynamic therapy with methyl aminolevulinate (MAL-PDT) is a non-surgical treatment for actinic keratoses, Bowen's disease and basal cell carcinoma. MAL-PDT is particularly useful in elderly patients, who often present co-morbidities and/or in whom surgical excision could be contraindicated. MAL-PDT is generally well tolerated; the most frequent acute adverse events include pain and burning sensation localized to the treatment area. We describe our observation of the occurrence of acute postoperative hypertension (APH) and hypertensive crisis, after a MAL-PDT. Methods: BP measurement was taken twice at 2-min intervals, both before and shortly after the MAL-PDT session. APH was defined as an increase in systolic BP by more than 20% or an increase in diastolic BP to above 110mmHg. Hypertensive crisis was defined as a systolic BP ≥180mmHg or a diastolic BP ≥110mmHg, with or without acute target organ involvement. Results: Prevalence of post-MAL-PDT APH was 22%; 11% of patients developed hypertensive crisis after MAL-PDT, requiring immediate treatment. Conclusion: We highlight the importance of blood pressure measurement both before and after MAL-PDT session to identify high-risk patients and to prevent potentially severe organ involvement subsequent to hypertensive crisis
Difficoltà di gestione terapeutica in un caso di psoriasi e malattia di Charcot-Marie-Tooth
No full textLa terapia fotodinamica: indicazioni e controindicazioni. Esperienza della Clinica Dermatologica
Full text linkLa terapia fotodinamica (PDT) è una forma di trattamento non chirurgico applicabile a diversi tipi di tumori non cutanei (tumori gastrointestinali, cerebrali, broncopolmonari, endometriali e vescicali) e ad alcuni tumori e lesioni pretumorali della cute. Il principio su cui si basa la PDT è quello di una reazione fotodinamica in grado di distruggere selettivamente le cellule tumorali, ovvero un processo chimico mediato dalla luce (processo foto-chimico) che prevede l’assorbimento della luce da parte di una sostanza fotosensibile e la successiva formazione di specie reattive dell’ossigeno (ROS), in grado di distruggere la cellula nella quale si sono formati. Dalla fine degli anni ’90 la PDT cutanea è divenuta una valida opzione terapeutica per il dermatologo, e dopo il 2000 è entrata a far parte delle linee guida internazionali per il trattamento dei tumori cutanei non melanocitari (NMSC) quali la cheratosi attinica (AK), il carcinoma basocellulare superficiale (BCC), e recentemente anche il morbo di Bowen (BD).
La tollerabilità e i vantaggi per il paziente in confronto alle altre terapie ablative chirurgiche e non chirurgiche sono notevoli. La selettività per le cellule malate con risparmio del tessuto sano permette di avere una guarigione della lesione ulcerativa post-trattamento più rapida, di mantenere la funzione della cute, e di ottenere un risultato esteticamente molto più accettabile. Questi vantaggi sono particolarmente evidenti per le lesioni di ampie dimensioni o per lesioni multiple soprattutto al volto. Inoltre è utile per il trattamento di pazienti anziani o in scadenti condizioni generali o in terapia anticoagulante.
In questo lavoro, presentiamo l’esperienza della Clinica Dermatologica della Fondazione IRCCS Policlinico San Matteo di Pavia a distanza di circa un anno dall’introduzione della PDT per la terapia dei tumori cutanei non melanocitari: sono stati trattati 29 pazienti e, tenendo conto che alcuni soggetti presentavano più di una lesione e che in uno stesso paziente potevano essere contemporaneamente presenti lesioni di natura diversa (BD, BCC e/o AK), sono stati nel complesso trattati 4 BD, 21 BCC e 52 AK.
L’esperienza della Clinica Dermatologica conferma i dati riportati in letteratura sull’efficacia e i vantaggi di que-sto tipo di terapia: i risultati ottenuti sono più che soddisfacenti con una remissione clinica delle lesioni trattate maggiore del 90% del totale delle lesioni. Gli eventi collaterali sono stati scarsi e caratterizzati da dolore o bru-ciore localizzato all’area trattata e da aumento della pressione arteriosa durante la procedura.
In conclusione, la PDT si è rivelata una terapia efficace, nonché una valida alternativa nel trattamento dei NMSC
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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