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Papers by Mohammed Bennani
Journal of Mathematical Psychology, 1997
Distance models for three-way proximity data, which consist of numerical values assigned to tripl... more Distance models for three-way proximity data, which consist of numerical values assigned to triples of objects that indicate their joint (lack of) homogeneity or resemblance, require a generalization of the usual distance concept defined on pairs of objects. An axiomatic framework is given for characterizing triadic dissimilarity, triadic similarity, and triadic distance, where the term triadic implies that each element of the triple is treated on an equal footing. Two kinds of distance models are studied in detail: the Minkowski-p or M p model, which is based upon dyadic components and includes the perimeter model as an important special case, and several models based on presence absence variables. They are shown to satisfy the tetrahedral inequality, a condition that is characteristic for the present axiomatization. Two monotonically convergent algorithms are described that find weighted least squares representations of three-way proximity data under the Euclidean M 1 model and the Euclidean M 2 model. To enable a scalefree evaluation of the quality of the fit, an additive decomposition of the sum of squares of the dissimilarities is derived. As illustrated in one of the examples, distance analysis of three-way, three-mode tables is possible by a suitable manipulation of the least squares weights. ] 1997 Academic Press
Journal of Electrocardiology, 2008
Hemodialysis (HD) has been associated with an increase in the amplitude of QRS complexes. Experie... more Hemodialysis (HD) has been associated with an increase in the amplitude of QRS complexes. Experience in a single patient with multiple measurements has shown that HD leads also to augmentation of P-wave amplitude. The objective of this investigation was to evaluate electrocardiogram (ECG) changes with HD in a cohort of patients undergoing this procedure with particular emphasis on the P-wave and QRS complex changes. The sum of amplitudes of P waves (OP) and QRS complexes (OQRS) in millimeters in the 12 leads of the ECG, along with a host of other ECG parameters, body weight, blood pressure, heart rate, electrolytes, and hemoglobin/hematocrit were measured before and immediately after HD in 47 patients. Hemodialysis resulted in a loss of a mean of 3 kg of weight and an increase in the SigmaP, SigmaQRS, mean QRS duration, maximum P-wave duration, and P-wave duration measured in lead II, whereas the changes in mean P-wave and corrected QT interval durations were not statistically significant. Percentage change (Delta%) in SigmaP and SigmaQRS correlated poorly with Delta% in electrolytes, hematocrit, blood pressure, heart rate, and weight. Values for SigmaP and SigmaQRS vs weight were r = 0.105, P = .48 and r = 0.09, P = .51, respectively. The Delta% in SigmaP correlated well with Delta% in SigmaQRS (r = 0.42, P = .003). Alterations in P-wave amplitudes and duration commensurate with the ones affecting the corresponding QRS complexes occur in patients undergoing HD and indicate that evaluation of measurements in serial ECGs should take this into account. The mechanisms of these phenomena continue to be elusive, and whether they represent cardiac and/or extracardiac influences has not as yet been unraveled.
Revue Des Maladies Respiratoires, 2006
Revue Des Maladies Respiratoires, 2006
Revue Des Maladies Respiratoires, 2006
La tuberculose multifocale se voit essentiellement chez le sujet immunodéprimé, rarement chez le ... more La tuberculose multifocale se voit essentiellement chez le sujet immunodéprimé, rarement chez le sujet immunocompétent ; nous rapportons le cas d'une patiente présentant une tuberculose multifocale de localisation inhabituelle notamment palpébrale et d'évolution paradoxale. Observation : Patient âgée de 28 ans ayant une notion de contage tuberculeux récent positif ;a présenté il y a 10 mois des douleurs thoraciques gauches associés à l'apparition d'une tuméfaction au niveau de la paupière supérieure droite évoluant dans un contexte d'altération de l'état général. L'examen clinique retrouve en plus d'un épanchement liquidien gauche une tuméfaction de la paupière supérieure droite avec des signes inflammatoires en regard. La radiographie thoracique objective une pleurésie gauche, l'intradermoréaction à la tuberculine est positive à 22 mm, bacilloscopie positive à plusieurs examens.la ponction pleurale retrouve un liquide exsudatif riche en lymphocytes et la biopsie pleurale en faveur d'une tuberculose. La ponction de l'abcès palpébral ramène du caséum, très évocateur de tuberculose et la biopsie palpébrale retrouve de nombreux granulomes épithéloides compatible avec une origine tuberculeuse. Le diagnostic de tuberculose multifocale est retenu (pleurale et cutanée), un bilan à la recherche d'une immunodépression est resté négatif. La patiente mise sous traitement antibacillaire à base de streptomycine, rifampicine, isoniazide et pyrazinamide. L'évolution après 6 mois est marquée par la régression de la pleurésie avec pérsistance de l'abcés de la paupiére et apparition d'autrs abcés froids. Un comlément scanographique retrouve un aspect évocateur de tuberculose dorsale, sternale et hépatique et présence d'un tuberculome palpébrale.la patiente est remise sous traitement à base de streptomycine, rifampicine, isoniazide, pyrazinamide et ethambutol avec bonne évolution et régression des abcès froids.
Journal of Mathematical Psychology, 1997
Distance models for three-way proximity data, which consist of numerical values assigned to tripl... more Distance models for three-way proximity data, which consist of numerical values assigned to triples of objects that indicate their joint (lack of) homogeneity or resemblance, require a generalization of the usual distance concept defined on pairs of objects. An axiomatic framework is given for characterizing triadic dissimilarity, triadic similarity, and triadic distance, where the term triadic implies that each element of the triple is treated on an equal footing. Two kinds of distance models are studied in detail: the Minkowski-p or M p model, which is based upon dyadic components and includes the perimeter model as an important special case, and several models based on presence absence variables. They are shown to satisfy the tetrahedral inequality, a condition that is characteristic for the present axiomatization. Two monotonically convergent algorithms are described that find weighted least squares representations of three-way proximity data under the Euclidean M 1 model and the Euclidean M 2 model. To enable a scalefree evaluation of the quality of the fit, an additive decomposition of the sum of squares of the dissimilarities is derived. As illustrated in one of the examples, distance analysis of three-way, three-mode tables is possible by a suitable manipulation of the least squares weights. ] 1997 Academic Press
Journal of Electrocardiology, 2008
Hemodialysis (HD) has been associated with an increase in the amplitude of QRS complexes. Experie... more Hemodialysis (HD) has been associated with an increase in the amplitude of QRS complexes. Experience in a single patient with multiple measurements has shown that HD leads also to augmentation of P-wave amplitude. The objective of this investigation was to evaluate electrocardiogram (ECG) changes with HD in a cohort of patients undergoing this procedure with particular emphasis on the P-wave and QRS complex changes. The sum of amplitudes of P waves (OP) and QRS complexes (OQRS) in millimeters in the 12 leads of the ECG, along with a host of other ECG parameters, body weight, blood pressure, heart rate, electrolytes, and hemoglobin/hematocrit were measured before and immediately after HD in 47 patients. Hemodialysis resulted in a loss of a mean of 3 kg of weight and an increase in the SigmaP, SigmaQRS, mean QRS duration, maximum P-wave duration, and P-wave duration measured in lead II, whereas the changes in mean P-wave and corrected QT interval durations were not statistically significant. Percentage change (Delta%) in SigmaP and SigmaQRS correlated poorly with Delta% in electrolytes, hematocrit, blood pressure, heart rate, and weight. Values for SigmaP and SigmaQRS vs weight were r = 0.105, P = .48 and r = 0.09, P = .51, respectively. The Delta% in SigmaP correlated well with Delta% in SigmaQRS (r = 0.42, P = .003). Alterations in P-wave amplitudes and duration commensurate with the ones affecting the corresponding QRS complexes occur in patients undergoing HD and indicate that evaluation of measurements in serial ECGs should take this into account. The mechanisms of these phenomena continue to be elusive, and whether they represent cardiac and/or extracardiac influences has not as yet been unraveled.
Revue Des Maladies Respiratoires, 2006
Revue Des Maladies Respiratoires, 2006
Revue Des Maladies Respiratoires, 2006
La tuberculose multifocale se voit essentiellement chez le sujet immunodéprimé, rarement chez le ... more La tuberculose multifocale se voit essentiellement chez le sujet immunodéprimé, rarement chez le sujet immunocompétent ; nous rapportons le cas d'une patiente présentant une tuberculose multifocale de localisation inhabituelle notamment palpébrale et d'évolution paradoxale. Observation : Patient âgée de 28 ans ayant une notion de contage tuberculeux récent positif ;a présenté il y a 10 mois des douleurs thoraciques gauches associés à l'apparition d'une tuméfaction au niveau de la paupière supérieure droite évoluant dans un contexte d'altération de l'état général. L'examen clinique retrouve en plus d'un épanchement liquidien gauche une tuméfaction de la paupière supérieure droite avec des signes inflammatoires en regard. La radiographie thoracique objective une pleurésie gauche, l'intradermoréaction à la tuberculine est positive à 22 mm, bacilloscopie positive à plusieurs examens.la ponction pleurale retrouve un liquide exsudatif riche en lymphocytes et la biopsie pleurale en faveur d'une tuberculose. La ponction de l'abcès palpébral ramène du caséum, très évocateur de tuberculose et la biopsie palpébrale retrouve de nombreux granulomes épithéloides compatible avec une origine tuberculeuse. Le diagnostic de tuberculose multifocale est retenu (pleurale et cutanée), un bilan à la recherche d'une immunodépression est resté négatif. La patiente mise sous traitement antibacillaire à base de streptomycine, rifampicine, isoniazide et pyrazinamide. L'évolution après 6 mois est marquée par la régression de la pleurésie avec pérsistance de l'abcés de la paupiére et apparition d'autrs abcés froids. Un comlément scanographique retrouve un aspect évocateur de tuberculose dorsale, sternale et hépatique et présence d'un tuberculome palpébrale.la patiente est remise sous traitement à base de streptomycine, rifampicine, isoniazide, pyrazinamide et ethambutol avec bonne évolution et régression des abcès froids.