Vincent Lafay | PubMed Health

PubMed2006

Activity-based rate-adaptive pacemakers under hyperbaric conditions.

OBJECTIVES: The aim of this study was to test a variety of currently available activity-based rate-adaptive pacemakers under hyperbaric conditions. BACKGROUND: Sports divers with pacemakers can dive under certain circumstances. The rate response of activity-sensing pacing under hyperbaric conditions has rarely been evaluated. MATERIALS AND METHODS: We manufactured a miniaturized hyperbaric chamber. A pacemaker inside was kept close to the corresponding telemetry wand placed on top of the chamber. An inflation device for coronary balloon angioplasty was used to create hydraulic pressure. Group I pacemakers were exposed to a 30 msw/98 fsw/4 ATA and after a 1-month waiting period to 60 msw/197 fsw-depth/7 ATA. Group II was exposed to only one dive to 60 msw. The electrogram and event marker telemetry were used to monitor the pacing stimuli and measurements were made for case distortion. RESULTS: The baseline pacing rate did not change in 27 tests. Return to baseline was shown during 18 tests after transient sensor-driven rate. There was a sensor rate response to manual brief shaking during and following testing. A case distortion was shown in 15 of 29 tests at 60 m. CONCLUSIONS: Modern accelerometers showed no sensitivity to pressure on the pacemaker can at 30 msw/98 fsw and 60 msw/197 fsw but in some devices responded to pressure changes. There was no pacing dysfunction or suppression of the sensor response despite the high incidence of case distortion at 60 msw/197 fsw. As a general rule, diving should not be allowed at depths greater than 20 msw/65 fsw.

Diving↗

PubMed2002

[General practice consultation in a hospital emergency department. History, evaluation and prospects].

INSTALLATION OF A GENERAL MEDICINE CONSULTATION: In 1995, in reaction to an increase of more than 35% over three years, related essentially to out-patient consultations, the installation of a general medicine consultation (GMC) near the emergency unit reception area (EUR) was envisaged. The project, developed over 5 years and based on an epidemiological study, was finally set-up in January 2000. The aims of the GMC are to supply information to the patients, help them in their administrative rights, and their subsequent follow-up by an external physician; the benefits expected by the EUR is the re-concentration on heavier and more urgent pathologies. THE FUNCTION OF THE GMC: Exclusively reserved for CCMU 1 patients (level 1 of the clinical classification of emergency unit patients), the GMC relies on general practice, with the presence of general practitioners installed in the SAU (emergency unit) sector, a double admission method (either via the emergency unit, or directly), a means of payment for the consultation and the absence of priority access to the technical network of the hospital. A social services worker is present. RECRUITMENT: After 18 months of activity, the GMC had managed more than 4500 patients and the method of referral via the SAU, almost exclusive at the beginning, has been reduced to a minority. The patients are generally young; socially close to the underprivileged population surrounding the SAU, but not in a situation of precariousness. The four principle motives for consultation are benign traumas, ENT infections, dermatological affections and pain. A DYNAMIC STRUCTURE: The rapid progress in the context of general medicine, and the observations of the physicians and non-physicians participating in this experience, has progressively modified the aim and mission of this GMC, which is gradually becoming a real structure of permanent care. Its originality is its close link between the town and the hospital, whilst permitting the various actors to remain free and independent. The traditional system of permanent care is no longer adapted to our society, and we must rapidly find solutions. The vocation of the GMC is not to become a universal model, but this new experience opens new horizons for the future.

Adult↗