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Biomedical subjects

L Bardet

Publications and source records attributed to L Bardet.

At least 19 recordsLinked to original sources

[Role of health volunteers for patients with amyotrophic lateral sclerosis and their family].

In ALS Centers, the patient receives coordinated care from Health Volunteers and the medical team including specialized physicians, therapists and social workers. There are two types of volunteers: those who assist the patient in hospital, the Medical Volunteers (MV), and those who make home visits, the Home Volunteers (HV). Both are recruited and trained by the ARS and have a single motivation: help the patient's; they are emotionally and morally fully qualified to accomplish their task in accordance with the rules that have been set by the Association. The ALS patient is seen for the first time by the Medical Volunteer at the ALS Center, immediately after his or her disease has been diagnosed by the clinic's director. The MV takes the initiative for the dialogue, which he/she leads gently and tactfully. The discussion is aimed at gathering useful information to be put in the document: "Connaissance du malade" (knowledge of the patient), working out the patient's primary concerns and assessing the carer's commitment, in a friendly atmosphere. Finally the volunteer gives the guidebook, "Livret d'accueil" to the patient. After the conversation, the MV decides which confidential pieces of information are to be passed on to the medical staff with a view to sorting out problems; information is then set the HV who will provide follow up care for this patient. Long-term care management of ALS patients is achieved through three regular monthly appointments at the ALS Center. With the help of the document "Connaissance du malade" the MV keeps better in touch with the patient using the feedback from the HV about what has been going on in the interval between the two visits to the ALS Center. This collaboration enables appropriate follow up care for the patients with clearly-defined objectives: dealing with the patient's anxiety, understanding his/her position at the present time, his/her daily routine and needs, comforting, checking compliance with treatment, counselling and supporting the family, answering delicate questions. Thus, the Health Volunteer's mission contributes meaningfully to medical treatment. This approach likely helps the person affected by ALS to regain the initially deteriorated sense of belonging to the social body.

Amyotrophic Lateral Sclerosis↗

Effects of zinc supplementation on blood rheology during exercise.

We previously reported a higher blood viscosity at corrected hematocrit (45%) (explained by a higher value of erythrocyte rigidity) in football players with low serum zinc (Zn) and thus presumably Zn deficiency; subjects with low serum zinc had also an impairment in performance. This interventional study was undertaken in order to assess the effects of zinc supplementation (compared to placebo) on blood rheology and performance either at rest or during exercise. Ten male healthy volunteers (age: 26+/-1.3 yr; weight 67.9+/-2.24 kg; height 177+/-3 cm) received at random order either zinc (20 mg/day) and placebo, according to a double blind cross-over procedure, during seven days. In each case on the eighth day they performed a 25 min submaximal exercise-test. At rest blood viscosity at corrected hematocrit 45% (gamma = 1000 s(-1)) was lower after Zn (3.56+/-0.14 vs. 4.13+/-0.16 mPa.s, p = 0.009), explained by a lower RBC rigidity index 'k' according to Quemada's equation (1.65+/-0.07 vs. 1.84+/-0.08, p = 0.03). Hematocrit and plasma viscosity were unchanged, but RBC aggregation was decreased (laser retrodiffusion-derived aggregation time 'Ta' 3.52+/-0.51 vs. 2.75+/-0.59, p = 0.02). The increase in blood viscosity during exercise is lower after Zn than placebo. Blood viscosity at corrected hematocrit 45% remains unchanged during exercise after Zn, yet it increases after placebo. RBC rigidity index 'k' remains lower during exercise after Zn. The rating of perceived exertion (Borg's scale) at the 20th minute of exercise is lower after zinc (5.6+/-0.4 vs. 6.6+/-0.4, p = 0.008). This study confirms that Zn improves erythrocyte deformability, decreases the exercise-induced acute increase in blood viscosity, and improves exercise tolerance. Since Zn deficiencies are not unfrequent in sportsmen, these findings may be potentially relevant to sports nutrition.

Adult↗

[Rheology and occlusive arterial disease of the legs].

Peripheral occlusive arterial disease (P.O.A.D.) is one of the situations in which hemorheological abnormalities are usually described. However the clinical relevance of hemorheological measurements in angiologic practice remains to be defined. The aim of the study was to investigate whether hemorheological disturbances are associated with alterations in oxygen diffusion and prognosis of the arterial disease. Three groups of patients were included in this work. First, a study was realized on 160 nondiabetic P.O.A.D patients (suffering from intermittent claudication to critical limb ischemia) in order to evaluate the possible influence of hemorheological disturbances on oxygen diffusion in distal tissue. A control group of 30 subjects matched for age and sex was also studied. A second study was performed on 80 diabetic P.O.A.D. patients (stage III and IV of Leriche and Fontaine classification) to determinate if hemorheological parameters could be considered as prognostic factors in the P.O.A.D. course. Hemorheological parameters were determined on different devices: red blood cell (RBC) aggregation by Myrenne aggregometer, blood and plasma viscosities by MT 90 falling ball viscometer. Transcutaneous oxygen pressure was measured by Radiometer TCM2 oxygen monitor. Several rheological parameters of non diabetic patients suffering from P.O.A.D. were significantly higher than those of control group subjects : blood viscosity (p < 0.05), plasma viscosity (p < 0.001), erythrocyte rigidity index (p < 0.01) and fibrinogen level (p < 0.0001). In the nondiabetic patients TcPO2 was negatively correlated with RBC aggregation, erythrocyte rigidity index and hematocrit /viscosity ratio. The diabetic patients who needed major amputation (above or below knee) presented significantly increased hemorheological parameters (blood viscosity, RBC aggregation, RBC rigidity index, hematocrit/viscosity ratio, fibrinogen level) compared to diabetic who had not been major amputated (no amputation or only toes' amputation). Our finding suggests that hemorheological factors (1) may influence oxygen transfer to distal tissues by maldistribution of blood flow and (2) may have prognostic significance in chronic peripheral occlusive arterial disease.

Aged↗

Effects of zamic as a means for zinc supplementation in growing children.

We investigated the effects of zinc supplementation in case of moderate growth retardation in which GH treatment could not be used. Zamic (ZA, an association containing arginine, L-methionine, and zinc; from Aguettant pharmaceuticals) was compared with arginine aspartate (AA) (5 g) in a crossover randomized trial (6 mo of each treatment at random order over 1 yr). We present preliminary results of 24 children who completed the study (3 girls, 21 boys, age 9-13 yr). Subjects had to be prepubertal, with no GH deficiency diagnosed. In 15 subjects growth velocity was lower than 5 mm/mo: In this case ZA improved growth velocity (rising from 3.105 +/- 0.229 to 5.4 +/- 0.69 mm/mo p < 0.01), whereas the effect of AA was not significant. The increase in growth velocity was higher with ZA (+2.44 +/- 0.657 mm/mo) than AA (+0.438 +/- 0.450 mm/mo) p < 0.05. These results suggest that ZA is more efficient than AA, consistent with the hypothesis that zinc needs are increased in those children in this period of life.

Adolescent↗

Variations in oligosaccharides and lactose in human milk during the first week of lactation.

Variations in oligosaccharides and lactose in human milk were studied in 15 mothers during the first week of lactation. The neuraminyloligosaccharides and heavy neutral oligosaccharides increased slightly from days 2 to 5 postpartum and appeared to decrease until day 7. The lacto-N-difucohexaoses, lacto-N-fucopentaoses, and lacto-N-tetraose increased until day 5 and then decreased. Lactodifucotetraose and the fucosidolactoses decreased substantially until day 5 (p less than 0.05) and appeared to stablize in the following days. Lactose increased until day 5 (p less than 0.05) and continued to increase thereafter. Lactose was negatively correlated with total oligosaccharides (p less than 0.10). The fluctuations observed in total oligosaccharides from days 2 to 5 postpartum and their subsequent stabilization and regular decrease during lactation confirm the hypothesis of Kulski and Hartmann that mammary secretion occurs in three periods: colostrum for the first 36 h postpartum, transitional milk from days 2 to 5 postpartum, and mature milk after day 5. The oligosaccharide variations we found corresponded to those of other milk constituents observed by other authors. The significance of the oligosaccharide variations is discussed.

Adult↗

Discriminant carbohydrate components of human milk according to donor secretor types.

Because of the variability of human milk carbohydrate composition, we determined the discriminant carbohydrate components of the milk of 18 mothers according to their ABH and Lewis secretor types during the first week of lactation. Comparative chromatograms revealed that the presence of neuraminyloligosaccharides is linked to the ABH secretor groups, and that the absence of oligosaccharides with Lea or Leb specificity is linked to the Lewis nonsecretor types. The study of carbohydrate composition according to donor secretor types consisted of measuring 16 variables from 69 samples. Analysis of variance showed significant differences between groups: high levels of N-acetylneuraminic acid and low levels of galactose distinguished ABH secretors from nonsecretors (p less than 0.001). In the ABH secretor groups, A and H secretors had higher N-acetylglucosamine contents than B and AB secretors (p less than 0.001) and lower galactose levels (p less than 0.001). The Lewis secretor groups were distinguished by significantly higher fucose levels (p less than 0.001). The ABH(+)Le(a-b-) group had higher lactose contents than the other groups (p less than 0.01).

ABO Blood-Group System↗

Diurnal variations and within the feed in lactose and oligosaccharides of human milk.

Variations of lactose and oligosaccharides in human milk were studied during the day and the feed, by dialysis, chromatography on Bio-gel P-2 column, paper chromatography, colorimetric analysis and gas chromatography. Progressive changes were found during the day, but not during the feed. A diurnal variation in milk lactose was seen, which was the inverse of the oligosaccharides. Significant negative correlations between lactose and oligosaccharides were seen in the afternoon and evening (p less than 0.05). The minimal mean value of lactose at 19.00 h is 58.64 +/- 5.28 g/l and the maximal mean values of oligosaccharides was 17.93 +/- 2.28 g/l. The data are discussed with regard to other milk constituents and to their possible physiological relevance.

Acetylglucosamine↗

[Determination of micro-quantities of serum lithium by atomic absorption spectrophotometry. Significance and applications].

The dilution of serum and the ionic components having an usual effect upon the lithium assay is examined about their influences in the determination of lithium microquantities. These are discussed according to the technique selected as well as the normal ionic variations that may be come across in serums. The method was applied to determination of serum lithium rate in a group of old subjects. The got lithium distribution is unsymmetrical at lower rates and no influence of age or sex was obvious.

Aged↗

Variations of lactose and oligosaccharides in milk from women of blood types secretor A or H, secretor Lewis, and secretor H/nonsecretor Lewis during the course of lactation.

Variations of lactose and oligosaccharides in human milk were studied over a 3-month lactation period by dialysis, chromatography on Bio-gel P-2 column, paper chromatography, colorimetric analysis and gas chromatography. Milk samples were collected from donors of various blood and secretor types. An increase in the concentration of lactose was noted: 59.25 +/- 1.61 to 72.17 +/- 1.35 g/l for the group of secretor A secretor Lea Leb individuals, and from 62.25 +/- 1.35 to 73.15 +/- 3.45 g/l for the group of secretor H secretor Lea Leb individuals. A decrease in the concentration of oligosaccharides was also found: from 16.71 +/- 0.99 to 7.90 +/- 1.29 g/l and from 18.51 +/- 0.74 to 7.33 +/- 0.65 g/l, respectively, for these same groups. In secretor H nonsecretor Lewis individuals, the concentration of lactose increased from 67.97 +/- 3.09 to 77.42 +/- 1.88 g/l, and the concentration of oligosaccharides decreased from 13.27 +/- 0.40 to 3.47 +/- 0.33 g/l. Analysis of oligosaccharide composition by chromatography showed that variations are in relation to the secretor Lewis type. All oligosaccharides decreased equally throughout the lactation period, regardless of the blood group. The decrease was more rapid, however, in the nonsecretor Lewis individuals. In these individuals, the absence of certain oligosaccharides is not compensated by an overproduction of the other oligosaccharides present or by biosynthesis of structurally different oligosaccharides. The origin of these oligosaccharides is discussed.

ABO Blood-Group System↗

[A simple hemolytic plate method for complement activity estimation (author's transl)].

The previous single radial haemolysis method is simplified for complement activity assay in human serums. The proceeding a "one point" test is described. This new technique is remarkable by its simplicity and rapidity. A study of the precision shows tha possibility of to make use of this simple "one point" hemolytic plate method.

Complement System Proteins↗

[A study of the single radial haemolysis optimization for complement haemolytic activity assay (author's transl)].

The experimental conditions for single radial haemolysis are analysed in order to optimize the haemolytic plate method for the assay of human total complement. The amount of haemolytic antibody used for sensitization of red cells, the concentration of sensitized sheep erythrocytes, the thickness of agarose layer, and the diameters of wells all exercise an influence on the area of haemolysis. The effects of these parameters are investigated with a view to obtaining the clearest reading and greatest sensitivity of the haemolytic activity plate method, and at the same time verifying the validity of the assay and the precision of the human serum haemolytic titres. This work reports the optimal experimental requirements with regard to the factors studied for minimizing the sources of error in complement haemolytic plate assay.

Complement System Proteins↗

[Hepatocyte changes in experimental iron overloading. An ultrastructural and microanalytic study].

In this paper the ultrastructural changes in hepatocytes which were experimentally induced by oral and parenteral iron overloading in Sprague-Dawley rats fed on a steatogenous U.A.R. 2-13 diet are analysed. The changes in the mitochondria consisted of flocculation, vesiculation and crystolysis. The R.E.G. showed marked phenomena of dilatation degranulation and fragmentation. The lysosomes became more numerous and increased their content of ferric macromolecules. Degenerative nuclear phenomena were also seen. A microanalytic study of the cellular organelles and nucleus was done relating the cellular lesion and the intracellular distribution of the iron.

Animals↗