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Biomedical subjects

F Duval

Publications and source records attributed to F Duval.

At least 55 records · Page 3Linked to original sources
PubMed1987

Technical development of an implantable cochlear prosthesis in Canada.

A new cochlear implant device is currently being developed by a group of research teams in Canada. This is an update on the progress of this development, including a brief description of the cochlear electrode array, the implantable stimulator, and the software development for the speech processor.

Cochlear Implants↗
PubMed1984

[Does correction of reflux delay the development of renal insufficiency?].

Eighty patients have consulted for vesico-ureteric reflux over the past ten years, and the majority of them underwent surgery. Of these surgical patients, six presented with mild or acute renal failure. After a temporary aggravation of the renal failure, the antireflux procedure led to a prolonged stabilization of the renal function by eliminating the occurrence of acute recurrent pyelonephritis. Antireflux surgery would therefore seem justified and beneficial even in cases of renal failure.

Acute Kidney Injury↗
PubMed1982

[Pharyngolaryngectomy without nasogastric feeding tube nor tracheal cannula (author's transl)].

Thirty three patients have been operated with total laryngectomy (LT) or pharyngolaryngectomy (PLT) with or without Zadical neck dissection, without nasogastric feeding to be and in five cases without tracheal cannula (but connection of a large tracheostomy). The authors demonstrated that there is no increasement of pharyngeal fistua. The beginning of oral alimentation has been made between the 4th and the 6th postoperative day. Such a procedure is more comfortable for the patients and decrease the hospitalisation duration.

Adult↗
PubMed1978

[Spatial filtration in the nerve networks].

A simplified neuronal model leads to studies of multiunit nerve nets. Properties of spatial integration and differentiation are exhibited according to the structure of the interconnections. A spatial periodicity of nervous signal appears in nets with backward lateral inhibitions. It is a fundamental property of this structure.

Models, Neurological↗
PubMed1977

[Modeling of neuronal plasticity by studies of spatio-temporal behavior of neural structures].

In order to point out spatio-temporal filtering of nervous structures after previous studies of their spatial behaviour, we have built a new model of cell according to synaptic and membrane plasticity (it agrees with properties of integration, memory and synaptic fatigue). This model, intended to be produced in many units, is made with integrated circuits in "thick film" technology.

Action Potentials↗
PubMedDate not supplied

Disturbances in hypothalamo pituitary adrenal and thyroid axis identify different sleep EEG patterns in major depressed patients.

This study was aimed at investigating the relationships between sleep EEG abnormalities and hypothalamo pituitary adrenal (HPA) and hypothalamo pituitary thyroid (HPT) disturbances in major depressive disorder. Post dexamethasone (DXM) cortisol levels and the dual TSH response to 08:00 h and 23:00 h TRH administration were determined after a 2 weeks wash-out period in a group of 113 DSM-IV major depressed patients (72 females aged 44.3+/-13.0 and 41 males aged 45.7+/-11) who were consecutively admitted to undergo sleep EEG recordings. Post-DXM cortisolemia, 08:00 and 23:00 post-TRH TSH values, time spent in rapid eye movement sleep (REMS), in slow wave sleep (SWS), and in stage 2 as well as time awake after sleep onset were introduced in a principal component (PC) analysis. The four 3 PC scores explaining up to 74% of the data set were further calculated for each patients and used in a cluster analysis. A three-cluster solution was retained. Controlling for the effects of age and gender, patients belonging to these three clusters could clearly be differentiated on the basis of their neuroendocrine responses and on their sleep EEG profiles. Compared to the two other clusters, cluster I (n=26) patients showed the most severe sleep continuity disturbances. Post-DXM cortisol escape and sleep architecture disturbances (consisting of a shortening of REMS latency and a decreased SWS) identified patients belonging to cluster II (n=39). Patients in cluster III (n=48) had the lowest TSH response to TRH and the less marked sleep EEG alteration. Clinical or demographic variables were unable to differentiate the three clusters. Our results suggest that different biological dysfunctions could each underlie particular neuroendocrine and sleep EEG disturbances in major depression.

Administration, Topical↗