Biomedical subjects

C Coudert

Publications and source records attributed to C Coudert.

10 recordsLinked to original sources

PubMed2005

[Collaboration between general practitioners and pharmacists in the management of patients on high-dosage buprenorphine treatment. Prescribers' practices].

OBJECTIVES: This paper examines the collaboration between general practitioners (GPs) and pharmacists in the outpatient management of patients on high-dosage buprenorphine (HDB) treatment. METHODS: A telephone survey of a sample of HDB prescribers in southeastern France questioned them about their knowledge, practices, and opinions about HDB treatment in October 2002; data from the national health insurance fund and the national statistics institute completed the study. Logistic regression was used to investigate factors associated with collaboration with pharmacists. GPs' practices were compared to assess their correlation, if any, with this collaboration. RESULTS: 345 GPs participated in the study. Only 54% reported collaborating with dispensing pharmacists in managing patients on HDB, despite official guidelines encouraging it. Collaboration was independently related to training in addiction treatment, a favorable opinion of maintenance treatment by GPs, long experience in HDB prescription, and participation in a specialized medical network. CONCLUSION: Implementation of recommendations on physician-pharmacist collaboration requires additional training in addiction medicine for GPs and the encouragement of their participation in medical networks. On the other hand, increasing the constraints on GPs may negatively affect patients' access to care.

Adult↗

PubMed2005

Normative findings of electrically evoked compound action potential measurements using the neural response telemetry of the Nucleus CI24M cochlear implant system.

One hundred and forty-seven adult recipients of the Nucleus 24 cochlear implant system, from 13 different European countries, were tested using neural response telemetry to measure the electrically evoked compound action potential (ECAP), according to a standardised postoperative measurement procedure. Recordings were obtained in 96% of these subjects with this standardised procedure. The group results are presented in terms of peak amplitude and latency, slope of the amplitude growth function and ECAP threshold. The effects of aetiological factors and the duration of deafness on the ECAP were also studied. While large intersubject variability and intrasubject variability (across electrodes) were found, results fell within a consistent pattern and a normative range of peak amplitudes and latencies was established. The aetiological factors had little effect on the ECAP characteristics. However, age affected ECAP amplitude and slope of the amplitude growth function significantly; i.e., the amplitude is higher in the lowest age category (15-30 years). Principal component analysis of the ECAP thresholds shows that the thresholds across 5 electrodes can be described by two factors accounting for 92% of the total variance. The two factors represent the overall level of the threshold profiles ('shift') and their slopes across the electrode array ('tilt'). Correlation between these two factors and the same factors describing the T- and C-levels appeared to be moderate, in the range of 0.5-0.6.

Action Potentials↗

PubMed2004

[Prescription of high dose buprenorphine by general practitioners].

BACKGROUND: Since 1996, prescribing buprenorphine in high dosage as a drug maintenance treatment has been allowing French general practitioners to undertake drug addicts with a pharmacological support. In France, buprenorphine prescriptions seem to spread over general practitioners (buprenorphine was given to 74,300 patients in 2001). This paper assesses the different factors associated with buprenorphine prescription by general practitioners and with the different degrees of general practitioners' commitment in actually caring drug addicts with the help of buprenorphine. METHODS: Two representative samples of private general practitioners, either prescribing buprenorphine (345 over a population of 876) or not prescribing (355 over a population of 1380) have been questioned through a phone interview in the department of South-Eastern France in November and December 2002. Samples have been constituted with the help of a random stratified survey according to sex, age and volume of services (acceptance rate: 65.5%). Survey data have been completed with general practitioners' activity data from Health Insurance and local socioeconomic data from Insee. RESULTS: 37.5% of general practitioners have at least once prescribed buprenorphine during the considered period, but only 26% of the prescribers treated 75% of patients. Prescribers are most often men, younger than 49 years, working in the fixed fees sector and having group practice. They are also most often members of a health care network, trained for drug maintenance treatments and, from an individual point of view, have relatives suffering cancer, or having HIV, or hepatitis C, or who are drug addicts. Low socioeconomic status of the area where GPs exert seems to be particularly associated with general practitioners' prescription of buprenorphine. CONCLUSION: Data handled in this paper show that supply of substitutive treatments is concentrated among a reduced number of general practitioners and in particularly deprived geographic areas. Workload in deprived areas combined to great professional commitment in maintenance treatment reveals unexpected and unwanted specialisation behaviours by general practitioners, as well as more isolated behaviours by general practitioners who do not ask for particular training program or help by colleagues. These results question the consistency of the general framework of support to general practitioners proposed by health authorities with general practitioners actual practice and needs.

Analgesics, Opioid↗

PubMed2004

[Quality assessment in the follow-up of cervical pap smears showing cytological abnormalities].

The aim of this paper is to report on how AFAQAP guidelines regarding the technical and diagnostic levels of cervical smears as well as the ANAES guidelines relating to the clinical follow-up of abnormal smears are applied. The material upon which the study is based was collected from a series of cervical smears representing 10% of those paid for by the French Social Security over a one year period in the Bouches du Rhône district. It appears that the identification of the quality of the sampling done by the pathology lab was poor (21.5%). With respect to the clinical follow-up of abnormal smears, the number of patients with whom there was no follow-up was rather high (12%), the treatment methods were heterogeneous and the clinical care for high grade lesions was insufficient in some cases. We have highlighted the need for follow-up within a group of subnormal smears not usually classified as pathological, but whose neglect would lead to a detrimental rate of false negatives for the patients concerned.

Cervix Uteri↗

PubMed2002

Buprenorphine prescription by general practitioners in a French region.

Since 1996 French general practitioners (GPs) may prescribe sublingual buprenorphine tablets as maintenance treatment for opiate dependence. The computerised data management of the main French health reimbursement system now allows surveillance of the use of this drug, and how it is prescribed. The purpose of this study is to determine the profile of maintained patients, prescribed doses, associated psychotropic treatments and how practitioners prescribe these treatments. This study analyses the 11186 buprenorphine prescriptions electronically transmitted for reimbursement between September and December 1999 in a specific French region. It was found that the 2078 treated patients consumed a mean of 11.5 mg of buprenorphine per day and 12% of them procured prescriptions from more than two prescribers. 43% of maintained patients had an associated benzodiazepine prescription, mainly flunitrazepam, often on the same prescription form. 61% of patients had regular follow-up, others had occasional consultations (21%) and another 18% had deviant maintenance treatment (more than two prescribers or more than 20 mg per day of daily buprenorphine dose). Benzodiazepine consumption was much higher in the 'deviant group' (71.4%). 85% of buprenorphine prescriptions were made by GPs. 21% of GPs prescribed buprenorphine and 61% of those had only one or two maintained patients. Buprenorphine prescription by French GPs is a procedure with no particular requirements, allowing many patients to easily access maintenance treatments. However, a high risk of abuse exists, which demands extensive investigation and evaluation of these practices.

Administration, Sublingual↗

PubMed2001

Relationship between NRT measurements and behavioral levels in children with the Nucleus 24 cochlear implant may change over time: preliminary report.

OBJECTIVE: Response from spiral ganglion cells to electrical stimulation via the Nucleus 24 cochlear implant can be measured using the neural response telemetry system. The purpose of this study was to assess, in children, the correlation between the neural response threshold and the behavioral levels used for cochlear implant programming process. METHODS: The neural response telemetry test was administered to 23 children (mean age at implantation: 4 years) with the Nucleus 24 cochlear implant. Four intra-cochlear electrodes (electrodes 5, 10, 15 and 20) were tested. The neural response threshold at 3, 6, 9 and 12 months post-implantation was compared with the behavioral threshold and the maximum comfort level estimated during the same periods: a Pearson's correlation test was performed for each tested electrode. RESULTS: On apical electrodes, the correlation with the behavioral threshold remained significant from 3 to 12 months post-implantation (r ranging from 0.696 to 0.909, P<0.05), and the correlation with the maximum comfort level was also significant throughout the study period, except on electrode 15 at 9 months (tendency to significance). On basal and intermediate electrodes, statistical correlations were found only at some points of time; nonetheless, at 12 months post-implantation, a significant correlation with behavioral levels could be clearly demonstrated both on electrode 15 (r=0.914--0.778, P<0.05) and on electrode 10 (r=0.845--0.720, P<0.05). CONCLUSIONS: This preliminary study suggests that the correlation between the neural response threshold and behavioral levels may improve from the base towards the apex of the cochlea. However, a significant correlation can be demonstrated for all tested electrodes at 12 months post-implantation. During the first months post-implantation care must be exercised when interpreting neural response telemetry measurements: a positive test does not necessarily mean that the stimulus delivered to the acoustic nerve will be centrally processed with the result of an auditory perception.

Action Potentials↗

PubMed1999

Antimicrobial susceptibilities and serogroups of clinical strains of Clostridium difficile isolated in France in 1991 and 1997.

Glycopeptides (vancomycin and teicoplanin) and metronidazole are the drugs of choice for the treatment of Clostridium difficile infections, but trends in susceptibility patterns have not been assessed in the past few years. The objective was to study the MICs of glycopeptides and metronidazole for unrelated C. difficile strains isolated in 1991 (n = 100) and in 1997 (n = 98) by the agar macrodilution, the E-test, and the disk diffusion methods. Strain susceptibilities to erythromycin, clindamycin, tetracycline, rifampin, and chloramphenicol were also determined by the ATB ANA gallery (bioMérieux, La Balme-les-Grottes, France). The MICs at which 50% of isolates are inhibited (MIC(50)s) and MIC(90)s of glycopeptides and metronidazole remained stable between 1991 and 1997. All the strains were inhibited by concentrations that did not exceed 2 microgram/ml for vancomycin and 1 microg/ml for teicoplanin. Comparison of MICs determined by the agar dilution method recommended by the National Committee for Clinical Laboratory Standards and the E test showed correlations (+/-2 dilutions) of 86. 6, 95.9, and 99% for metronidazole, vancomycin, and teicoplanin, respectively. The E test always underestimated the MICs. Strains with decreased susceptibility to metronidazole (MICs, >/=8 microgram/ml) were isolated from six patients (n = 4 in 1991 and n = 2 in 1997). These strains were also detected by the disk diffusion method (zone inhibition diameter, </=21 mm); they belonged to nontoxigenic serogroup D (n = 5) and toxigenic serogroup H (n = 1). Decreased susceptibility to erythromycin (MICs, >/=1 microgram/ml), clindamycin (MICs, >/=2 microgram/ml), tetracycline (MICs, >/=8 microgram/ml), rifampin (MICs, >/=4 microgram/ml), and chloramphenicol (MICs, >/=16 microgram/ml) was observed in 64.2, 80.3, 23.7, 22.7, and 14.6% of strains, respectively. Strains isolated in 1997 were more susceptible than those isolated in 1991, and this trend was correlated to a major change in serogroup distribution. Periodic studies are needed in order to detect changes in serogroups and the emergence of strains with decreased susceptibility to therapeutic drugs.

Adult↗

PubMed1998

[Digital multi-filter auditory prosthesis: study of its efficiency in function of number of filters and their programming].

We designed a prototype of a 7-filter digital auditory prosthesis table prototype. For each of these filters frequency band width, amplification and compression were programmable in order to adapt these parameters to the deaf patient's audiometric particularities. We compared the hearing improvement it was possible to obtain either with the 3-analogue-filter auditory prosthesis Triton 3004 from Siemens, or with our prototype as a function of the number of filters (3, 4 or 7) and their frequency band width programmability. We tested 21 patients suffering from middle or severe neurosensory hearing loss. This study allows to demonstrate that to overpass the present analogue T004 device a 7 programmable-width-filter strategy seems to be the most appropriate. Further studies benefiting with material improvement of our prototype and finer audiometric adjustment of filter strategies as well as long term clinical studies have to be carried out.

Acoustic Stimulation↗

PubMedDate not supplied

Auditory performances of a 3-4-7 programmable numeric filter hearing aid.

We designed a non-portable prototype seven-filter digital auditory hearing aid. For each of the filters, frequency bandwidth, amplification and compression were programmable in order to adapt these parameters to the deaf patient's audiometric characteristics. We compared the hearing improvement it was possible to obtain either with the three-analogue filter auditory prosthesis Triton 3004 hearing aid from Siemens or with our prototype as a function of the number of filters (three, four or seven) and their frequency bandwidth programmability. We tested 21 patients suffering from moderate to severe sensorineural hearing loss. This study allowed us to demonstrate that a seven programmable-width filter strategy seems to be more effective than the present analogue T004 device. Further studies with improvement of our prototype and finer audiometric adjustment of filter strategies, together with long-term clinical studies, need to be carried out.

Acoustic Stimulation↗

PubMedDate not supplied

Inner ear pressure in Menière's disease and fluctuating hearing loss determined by tympanic membrane displacement analysis.

Menière's disease and fluctuating hearing loss are related to labyrinthine fluid pressure variations. The development of a new indirect method of analysis of the tympanic membrane displacement during the stapedial reflex, using the Marchbanks Measurements System (MMS 10), allows us to study inner ear fluid pressure during these pathological conditions. In this study, measurements with this method were made in four groups of patients: a control group with normal hearing (n=7), stable sensorineural hearing loss (n=9), fluctuating hearing loss (n=8), and Menière's disease (n=25). Results show, first, a good relationship between the recording of negative curves, suggesting a high pressure, and the acute episodes of fluctuating hearing loss; and, secondly, in the case of Menière's disease two types of situation: positive and negative curves suggesting normal and high pressures, respectively.

Adult↗