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Hypnic headache secondary to a growth hormone-secreting pituitary tumour
Full text linkHypnic headache (HH) is a rare, benign, chronic
headache disorder, usually affecting aged people
and characterized by a close relation to sleep. It was
first described by Raskin in 1988 (1). Diagnostic
criteria for HH have been established, and HH is
included in the recent International Headache
Society (IHS) classification as a primary form of
headache (IHS classification 4.5) (2).
At the time of writing, > 100 cases have been
reported in the literature (for review see (3)). Furthermore,
several patients with this disorder have
been described in Italy (4–12). The pathophysiology
of HH remains unclear (13). In most instances,
even extensive neurological and neuroradiological
examinations will be normal (14). However, symptomatic
HH has been reported in relation to
obstructive sleep apnoea syndrome (15), arterial
hypertension (3), pontine stroke (16) and posterior
fossa meningioma (17). We report a case of HH in
an acromegalic patient with an intrasellar pituitary
adenoma
Migraine in Adolescents: Validation of a Screening Questionnaire
No full textBACKGROUND: Few studies in adolescents deal with the level of agreement between questionnaire and interview information in relation to headache symptoms.
OBJECTIVE: To evaluate the validity of a self-administered questionnaire on headache for use in epidemiological studies of Italian high school students.
METHODS: The questionnaire incorporated all items required for diagnosing migraine according to the criteria from the 2004 International Classification of Headache Disorders. The migraine diagnoses obtained from questionnaires were validated against the gold standard diagnoses by a headache specialist.
RESULTS: Out of 104 students answering the questionnaires, 93 (89.4%) participated in extensive semi-structured interviews by a neurologist. The chance-corrected agreement rate (kappa) was 0.66, which is considered good. The questionnaire-based migraine diagnosis had a sensitivity of 67.3%, specificity of 100%, positive predictive value of 100%, and negative predictive value of 73.3%.
CONCLUSIONS: The results indicate that our self-administered questionnaire may be an acceptable instrument in determining the prevalence of migraine sufferers in the northeast Italy adolescent population, useful in identifying subjects with "definite" migraine
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
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