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Biomedical subjects

M Magnier

Publications and source records attributed to M Magnier.

15 recordsLinked to original sources
PubMed1990

[In vitro test of piezoelectric lithotripsy with ultrasound detection using an EDAP LT 01 lithotripser].

200 in vitro shots were performed with an EDAP LT 01 system in order to test the sensitivity of the various urinary stones to lithotrity and to study the action of the various shot parameters. All calculi do not have an equally favorable reaction to lithotrity. The deciding factor is neither their hardness, nor their chemical composition, nor their crystallizing shape, but rather the architecture ruling the arrangement of the crystallins forms in the calculus. The most important shot parameter is the power of the system, which conditions its efficiency. However, the shooting method, and more specifically the setting of the shot rate, allows adjusting the shots according to the desired results. The lithotriters will only be improved, ie. made more effective and less traumatic, if these experiments are continued.

Humans↗
PubMed1989

[Extracorporeal lithotripsy of biliary lithiasis. 160 patients treated with an EDAP apparatus].

Since February 1987, we have been using extracorporeal lithotripsy for certain cases of chronic biliary lithiasis, using an EDAP lithotripter. The technique is reserved for patients with less than four radiotransparent, or partially calcified calculi, less than 25 mm in size, within the context of a functioning gall bladder with no evidence of lithiasis in the C.B.D. Dissolution of the fragments after lithotripsy is ensured by bile salts, this treatment being continued for at least 3 months after the gall bladder has been completely cleared. 160 patients were treated using a total of 181 treatment sessions. Hospitalisation lasted on average 3 days, 1/5th of the patients suffered right hypochondrial pain and nausea for 24 hours. 17% of patients showed a transient elevation in alkaline phosphatase and 12% an elevation in amylase after the procedure. The rate of gall bladder clearance was 24% at 1 month, 40.7% at 3 months ans 50% at 1 year. 11 cholecystectomies were carried out (6.8%), 8 of which were essential. Bile duct migration occurred in 2 cases and produced oedematous pancreatitis in one case. Recurrent lithiasis was noted in 4 cases between 6 and 18 months after gall bladder clearance. 75% of cured patients had a single, radiotransparent stone less than 20 mm in diameter.

Adult↗
PubMed1987

[Surgical complications of renal transplantation in children. Retrospective study of 372 cases].

On the basis of a personal series of 372 cases of renal transplantation performed in children, half of whom presented congenital urinary tract malformations, the authors report 110 complications (29.6%). The most frequent complications were urological (14.2%), consisting essentially of fistulae (8.9%) and stenoses (3%). These were followed by vascular complications (6.4%) generally in the form of stenoses (4.8%) and rarely thromboses (1.1%). The authors also report the various local complications which were infectious (wall abscess, suppuration of the renal compartment), haemorrhagic (haematomas) or stones (stones forming on non-resorbable sutures) as well as 5 cases of lymphocele. The prophylaxis of these complications depends on the care taken in collection of the graft (en bloc removal of both kidneys), the restoration of the continuity of the urinary tract (as much as possible Lich-Gregoire extravesical uretero-vesical reimplantation), the vascular anastomoses (vascular dissection limited to a strict minimum), the choice of suture material (resorbable synthetic suture material) and the prevention of infection by systematic pre-, intra- and post-operative antibiotic therapy.

Child↗
PubMed1987

[Urinary diversions and intestinal grafts in renal transplantation in children. Report of 8 cases].

In a series of 400 transplantations, 8 children presented a severe lesion of the lower urinary tract requiring an intestinal graft to divert the urine or to replace the useless bladder: 4 cases of posterior urethral valves and 4 cases of neurogenic bladder. Four permanent urinary diversions and 4 bladder enlargements, including 3 temporary diversions, were performed. The sigmoid colon was used in 5 cases and the ileum was used in 3 cases. The preparation of the intestinal graft was always performed prior to the transplantation. The uretero-intestinal anastomosis included an antireflux device in 3 of the 8 cases. There were no deaths in this series. Three occlusions and 2 lymphoceles occurred in the immediate post-transplantation period, but were corrected by re-operation. Two cases of calculi occurred in the long term, one of which required operation. Moderate stenosis of the renal artery in one case resulted in systemic hypertension which was well controlled by medical treatment. An episode of acute pyelonephritis resolved rapidly with antibiotic treatment. Two cases of acidosis were corrected by salt supplementation. There was one case of early graft rejection on the 15th day and a delayed rejection after 18 months, leading to removal of the transplant. At the present time, 6 renal grafts function normally (75%) with a follow-up of 1 to 8 years.

Adolescent↗
PubMed1976

[Demonstration in Japanese quails of genetic differences in survival from hypoxia].

164 quails (Coturnix coturnix japonica; 94 males and 40 females), 27-55 days old and belonging to 9 families, each family being issued from a different couple of parents, were submitted to an acute nitrogen hypoxia which resulted in an overall mortality of 43.29%. The fact that a high statistically significant (p less than 0,001) heterogeneity was pointed out in these different families supports the existence of a genetic component of resistance towards hypoxia.

Animals↗
PubMed1975

[Influence of recent modification of behavioral relationships of male and female OF1 mice on resistance to nitrogen or carbon monoxide hypoxia].

A decrease of resistance to hypoxia is obtained in OF1 mice, 24 hours after an hyperactivity resulting from a grouping by 13 of male or female mice previously isolated. Besides, this decrease is statistically significant in an acute nitrogen hypoxia but not in an acute carbon monoxide poisoning. In both hypoxias, in mice of same age the males are less resistant than females.

Age Factors↗
PubMedDate not supplied

Perspectives in chronobiology of air pollution.

In a series of experiments, male and female Sprague Dawley rats, kept in light (L) from 06(00) to 18(00) alternating with darkness (LD 12:12) inhaled different concentrations of carbon monoxide (50-1,700 ppm) at each of two test times, 12 h apart. A decrease in flow of CO2 (VCO2) resulting from CO inhalation was greater in the active dark (D) than resting light (L) span. Experimental hypoxic mortality of male and female mice also shows circadian variations, being greater in the D than in the L span. Moreover, a difference of mortality was observed betwen hypoxic exposures performed at 12(00) (in LD or DL) and hypoxic exposures performed at 00(00) (in LD or DL). Such results await tests of any extent to which they model responses of human beings to air pollution. In human beings any external environmental circadian, circaseptan and circannual variations in air pollution as such may serve to variable extent as socioeconomic synchronizers of innate rhythms with a corresponding frequency, rather than as solely generators of time patterns in any physiopathologic response to air pollution.

Air Pollution↗