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Biomedical subjects

A Guyot

Publications and source records attributed to A Guyot.

29 records · Page 2Linked to original sources
PubMed1986

Diffusion of ofloxacin into the cerebrospinal fluid in patients with bacterial meningitis.

Ofloxacin diffusion into cerebrospinal fluid (CSF) was evaluated in nine patients with bacterial meningitis. Patients were under treatment with i.v. amoxicillin (100 mg/kg/day), and during the first five days they were also given oral ofloxacin, 200 mg b.i.d. On days 2 and 5, blood and CSF samples were collected for assays by both HPLC and microbiological techniques. Samples were obtained 2 h (n = 2), 4 h (n = 1), 6 h (n = 2), 8 h (n = 2) and 12 h (n = 2) after the ofloxacin dose respectively. Concentration in CSF was 50 to 60% of that in serum and there was no significant difference between results with the two assay techniques.

Adult↗
PubMed1985

[Bourneville's tuberous sclerosis of neonatal disclosure. Apropos of 2 cases].

A cardiac murmur was found in a newborn, after 12 hours of life. It was related to an intracardiac tumor, and we made the diagnosis of tuberous sclerosis. The same diagnosis was made in another patient, with a tumor diagnosed by obstetrical echography. In these two cases, seizures occurred rapidly during the evolution. In one case, the heredity was dominant, in the other one, it was a "de novo" mutation. It is unusual to diagnose tuberous sclerosis during the neonatal period, so we report these two cases.

Female↗
PubMed1985

[Complications of varicella as a function of the terrain. Apropos of 103 cases].

The complications of varicella have been studied in 103 cases of hospitalized children. The patients have been divided into two groups: group I comprises 94 previously healthy children; group II is made up of 9 children who have been treated by corticotherapy for a long time. The frequency of the complications is not statistically different between the two groups. On the other hand, all the fatal complications are observed in group II (3 deaths out of 9 patients). This investigation is in accordance with published data which allows us to characterize a high risk population for life threatening varicella: patients with congenital or acquired cell immunity deficiency. This group requires special therapy: vaccination, specific immunoglobulins and acyclovir.

Adolescent↗
PubMed1984

Adrenocorticotropin, calcitonin, and antidiuretic hormone as tumor markers in patients with bronchogenic carcinoma of various histological types.

We measured basal and dexamethasone-suppressed plasma ACTH in 246 patients with bronchogenic carcinoma (105 with small-cell carcinoma); in 138 of these patients (67 with small-cell carcinoma) basal and pentagastrin-stimulated serum calcitonin was also determined. In addition, in a subgroup of 120 patients (58 with small-cell carcinoma) plasma ADH with reference to plasma osmolality was also assayed. Non-suppressible plasma ACTH was found in 45% of patients with small-cell carcinoma but only in isolated cases of large-cell carcinoma, adenocarcinoma, and squamous-cell carcinoma. Serum calcitonin was increased in 28% of patients with small-cell carcinoma but only in few patients with other tumor types. Stimulation of calcitonin by pentagastrin was ineffective. Plasma ADH was inappropriately high in 47% of patients with small-cell carcinoma. Strikingly high also was the incidence of increased ADH concentrations in patients with large-cell (40%), adenocarcinoma (46%), and squamous-cell carcinoma (29%). By measuring plasma ACTH after dexamethasone suppression and ADH with reference to osmolality, the sensitivity of these tumor markers in detecting pathological hormone secretion is markedly increased. In small-cell carcinoma the simultaneous measurement of ACTH, ADH, and calcitonin gives a high yield of positive results (74%), indicating that this set of tumor markers is a promising aid in diagnosis and therapy control.

Adenocarcinoma↗
PubMedDate not supplied

Antimicrobial resistance of Neisseria gonorrhoeae in Liberia.

The prevalence and molecular characteristics of penicillinase-producing Neisseria gonorrhoeae (PPNG) and tetracycline-resistant N. gonorrhoeae (TRNG) were determined in 10 clinics in Monrovia, Liberia, to assess the likely effectiveness of the current standard treatment with penicillin or tetracycline. One hundred gonococcal strains were isolated from 146 urethral swabs and 261 cervical swabs and screened for susceptibility to ceftriaxone, penicillin, spectinomycin and tetracycline by the disk diffusion method; 83% were resistant to penicillin and 63% to tetracycline. Twenty-one strains from 18 men and 3 women with uncomplicated gonorrhoea were subjected to more detailed characterization. These 21 strains belonged to 5 auxotype/serovar classes; 86% were PPNG/TRNG. Three PPNG harboured the 4.4 MDa penicillinase plasmid and 16 the 3.2 MDa plasmid. All TRNG harboured the 25.2 MDa plasmid and their MICs for tetracycline were > 32 mg/L. They gave a PCR product which, according to its restriction pattern, corresponded to the American type tetM gene. By the agar dilution method, all strains exhibited intermediate resistance to sulphamethoxazole-trimethoprim (19:1) (co-trimoxazole) with MICs of 8-32 mg/L. All strains were susceptible to spectinomycin and ciprofloxacin. The MICs for gentamicin were 4-8 mg/L. The use of effective and affordable antimicrobial chemotherapy with either 500 mg ciprofloxacin or a single dose of gentamicin is discussed, with consideration of molecular biological, pharmacological and public health aspects.

Ceftriaxone↗
PubMedDate not supplied

Beneficial effect of post -thawing osmoconditioning on the recovery of cryopreserved coffee (Coffea arabica L.) seeds.

Osmoconditioning-controlled rehydration of seeds in a solution with low osmotic potential -has been shown to reinvigorate aged seeds. The present work aimed at investigating the effect of osmoconditioning on the germination of cryopreserved seeds of Coffea arabica, whose viability and vigour are drastically affected by cryopreservation. For cryopreservation, seeds were desiccated to 0.21 g H2O/g dw, cooled at 1 degree C/min to -50 degree C, then immersed rapidly in liquid nitrogen. After rapid rewarming, seeds were osmoconditioned for 1 to 6 weeks using solutions with osmotic potentials between -1 and -4 MPa. The time to produce half of the final percentage of normal seedlings, T50, was about three fold lower with osmoconditioned seeds than with non-osmoconditioned seeds (12-14 d vs 36 d). Moreover, after a 6-week osmoconditioning treatment with solutions with osmotic potential of -1 and -1.25 MPa, the percentage of seedlings recovered from cryopreserved seeds was 64-74%, against 13-16% only for cryopreserved seeds which were not osmoconditioned.

Journal Article↗
PubMedDate not supplied

[Giant axonal neuropathy. Apropos of a case].

A new case of giant axonal neuropathy is reported about an 11 years old boy born with the Robin anomalad. The diagnosis is based on a peripheral nerve biopsy. This new observation can be added to 12 others ones which have already been published to study the characteristics of this peripheral neuropathy. The etiology and physiopathology are unknown.

Axons↗
PubMedDate not supplied

[Lipoprotein lipase deficiency. Apropos of 2 cases].

Lipoprotein-lipase deficiency is an uncommon disease, inherited as an autosomal recessive pattern. The authors report two cases: the first one is a fourteen years old girl. It is revealed by abdominal pain; the diagnosis is detected by a milky plasma and confirmed by the enzyme activity which is dramatically decreased; the other one is a seven year old boy, who shows several pancreatitis but in whom the enzyme activity is not so low, perhaps because of genotypical difference.

Acute Disease↗
PubMedDate not supplied

[Polycystic kidney and Bourneville's tuberous sclerosis. Apropos of 2 cases].

Abdominal tumor is discovered in a 4 months old boy and a 2 years old another. The paraclinical exploration leads to the diagnosis of polycystic disease. But the clinical course permits to precise that the renal lesions are those of tuberous sclerosis. Indeed the children exhibit adenoma sebaceum at ages of 4 and 7 years.

Adenoma↗