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Biomedical subjects

S Bobin

Publications and source records attributed to S Bobin.

At least 37 records · Page 2Linked to original sources
PubMed1999

[The place of MRI in the study of cerebrospinal fluid fistulas].

Results of CT and MRI explorations in 8 patients with cerebrospinal fluid (CSF) fistulae are reported and compared with surgical findings in 7. Sensitivity of MRI (CISS and fast T2 spin-echo sequences) was excellent giving perfect correlations with surgical findings in 7/7 cases. CT and MRI were found to provide complementary information suggesting they should be used in combination as first intention explorations of suspected CSF fistulae. Computerized cisternography should be used if MRI is contraindicated or if a clinically and biologically proven CSF fistulae is not visualized by CT or MRI.

Adolescent↗
PubMed1999

Laryngotracheal manifestations of gastroesophageal reflux in children.

Gastroesophageal reflux is generally a benign condition, which resolves spontaneously, and which is usually manifested by digestive signs. More recently, laryngotracheal conditions such as laryngospasm, laryngomalacia and recurrent laryngitis, have been ascribed to gastroesophageal reflux. However, there is not a single common mechanism linking these two pathologies and different theories are postulated. Diagnosis of gastroesophageal reflux is based essentially on prolonged pH monitoring, where a negative result unfortunately cannot rule out reflux responsibility. Thus, in the end, in the face of a sufficient body of evidence, it is the effectiveness of the anti-reflux treatment which will make it possible to establish a link between gastroesophageal reflux and the laryngotracheal manifestations observed.

Apnea↗
PubMed1998

[Importance of antiproteases in the treatment of microsporidia and/or cryptosporidia infections in HIV-seropositive patients].

Diarrhea due to infection with Microsporidium (M) or Cryptosporidium (C) raises significant therapeutic challenges in HIV-infected patients. The usefulness of protease inhibitor therapy was evaluated in 20 HIV-positive patients with positive tests for M and/or C. There were 17 men and three women with a mean age of 42.5 years (range, 26-64 years). Two patients had category B disease and 18 category C disease according to the 1993 CDC classification scheme (CD4 count before therapy, 72/mm3; mean viral burden, 4.6 log). Seventeen patients had chronic diarrhea (due to M in 12 cases and to C in five), and the remaining three patients were asymptomatic M carriers. Clinical symptoms resolved after addition to the antiretroviral regimen of indinavir (n = 17) or saquinavir (n = 3). Mean weight gain was 10.5 kg. Karnofsky's index improved. Twelve patients, including one of the three who were asymptomatic at baseline, had negative follow-up stool cultures. The mean CD4 count increase was 125/mm3, and the mean viral burden decrease was 1.285 log. These data suggest that protease inhibitors may be capable of eradicating M and/or C infection refractory to other treatments. The reason for this effect may involve partial restoration of immune function due to inhibition of HIV replication.

AIDS-Related Opportunistic Infections↗
PubMed1997

Osteoid osteoma of the petrous bone.

We present a case of osteoid osteoma of the petrous bone presenting with progressive sensorineural hearing loss. CT showed a dense homogeneous mass at the promontory surrounded by a thin bony border. On MRI this lesion gave intermediate signal intensity on T1- and T2-weighted spin-echo images and enhanced intensely with gadolinium. Surgical removal and pathological study proved the diagnosis.

Adult↗
PubMed1997

Status of accelerated fractionation radiotherapy in head and neck squamous cell carcinomas.

Considerable interest has been shown in recent years about hyperfractionated and accelerated radiation therapy for head and neck squamous cell carcinomas. The first randomized trial showing an advantage for hyperfractionation in terms of tumor control was the European Organization for Research and Treatment of Cancer 22791 trial. More recently, accelerated radiotherapy has been tested in many studies showing that high total doses of radiation could be delivered in overall treatment time shorter than conventional radiation therapy. The benefit of accelerated radiation therapy has been reported in some recently completed randomized trials, which suggests that rapid repopulation of surviving tumor cells during radiation therapy is a major determinant to obtain cure in this type of cancer.

Carcinoma, Squamous Cell↗
PubMed1997

[Osteoid osteoma of the middle ear. Review of the literature apropos of the first described case].

The case of an osteoid osteoma of the middle ear in a 42 year old man is reported. No former case has now been reported in the literature for this localization. The suspected diagnosis of osteoid osteoma was based on the pain and the findings of bone computerize tomography. In our case, the osteoid osteoma was totally painless and the diagnosis was made after surgical findings by histological studies. Some clinical and imaging points, pathologic findings and differential diagnosis are also discussed.

Adult↗
PubMed1996

Potential doubling time and clinical outcome in head and neck squamous cell carcinoma treated with 70 GY in 7 weeks.

PURPOSE: To study the predictive value of pretreatment potential doubling time and labeling index, as measured by flow cytometry in patients with head and neck squamous cell carcinoma treated with conventional radiotherapy. METHODS AND MATERIALS: 70 patients with a squamous cell carcinoma of the oropharynx and 4 patients with another involved head and neck site were entered in this prospective study. The duration of the S phase (TS), the labeling index (LI), and the potential doubling time (Tpot) were obtained by flow cytometry measurements of a tumor biopsy obtained after i.v. injection of 200 mg bromodeoxyuridine to the patient. The treatment consisted of 70 Gy in 7 weeks, 2 Gy per fraction and five fractions per week. RESULTS: The mean and median LI were 7.7% (standard deviation, SD: 5.0) and 6.3%, respectively. The mean and median TS were 9.3 h (SD: 3.6) and 8.3 h, respectively. The mean and median Tpot were 5.6 days (SD: 5.4) and 4.6 days, respectively. No significant relationship was found between the Tpot or LI and the tumor stage (T), nodal status (N), histological grade, and the site of the primary within the oropharynx. The only parameter significantly associated with an increased risk of local relapse was the tumor stage (p < 0.001). The mean Tpot for the group of tumors that relapsed locally was 5.3 days (SD: 3.3), compared to 6.1 days (SD: 4.08) for those who did not relapse locally (NS). Two parameters were significantly associated with a decrease in disease-free (DFS) and overall survival, namely the tumor stage (p < 0.005, and p < 0.001, respectively, for DFS and overall survival) and nodal involvement (p = 0.02 and (p < 0.005, respectively, for DFS and overall survival). The TS, LI, DNA index, and Tpot were not significantly associated with local relapse, DFS, and survival, either in the univariate or in the multivariate analysis. CONCLUSIONS: The method used to evaluate tumor cell kinetics did not provide clinically relevant kinetic parameters for this type of cancer. The classic prognostic factors (tumor stage and nodal status) were strongly associated with clinical outcome.

Bromodeoxyuridine↗
PubMed1996

Electrophoretic and isoelectric focusing analysis of human recombinant alpha 2-HS glycoprotein produced in insect cells: analysis of the post-translational events.

Alpha 2-HS glycoprotein (AHSG) is a human serum glycoprotein synthesized by liver cells. It is a natural inhibitor of the insulin receptor tyrosine kinase activity. We produced this protein in insect cells by using a recombinant baculovirus expressing the whole coding sequence of the protein. By analyzing AHSG on isoelectric focusing and on sodium dodecyl sulfate (SDS) gels, followed by immunoblot, AHSG produced in insect cells was found to be phosphorylated and to possess the connecting peptide between the A and the B chains. The same features were found in the protein produced by Hep3B, a human liver cell line that synthesizes AHSG. By contrast, no phosphorylation could be detected in AHSG present in normal human plasma, and the connecting peptide was clipped. As the protein produced in insect cells is active on insulin receptors, in contrast to the plasma protein, our results suggest that the biological activity of the protein may be associated with its single chain form together with its phosphorylation.

Amino Acid Sequence↗
PubMed1996

[Accelerated radiotherapy: initial results in a series of locally very advanced carcinomas of the upper respiratory and digestive tracts].

From 1992 to 1993, 46 patients with very locally advanced (74% T4) head and neck carcinomas and extensive cervical involvement (82% N2-3) were treated at the Institute Gustave Roussy with a very accelerated radiotherapy regimen: 62 Gy in three weeks with two daily 1.75 Gy fractions. Early mucosal reactions were severe but manageable in this population of patients with frequent alteration of initial performance status. Nearly every patient experienced a grade 3 or 4 (WHO) mucositis and 80% required tube feeding. Follow-up is not sufficient to draw firm conclusion about late reactions but they do not seem different from those induced by conventional radiotherapy. The overall 2-year survival rate of 49.4% and loco-regional control rate of 67% seem superior to the results of conventional radiotherapy for such advanced tumors. These results have led to a multi-center randomized controlled trial comparing this regimen of accelerated radiotherapy with conventional fractionated radiotherapy.

Adult↗
PubMed1995

Structure of Saccharomyces cerevisiae alpha-agglutinin. Evidence for a yeast cell wall protein with multiple immunoglobulin-like domains with atypical disulfides.

alpha-Agglutinin of Saccharomyces cerevisiae is a cell wall-associated protein that mediates cell interaction in mating. Although the mature protein includes about 610 residues, the NH2-terminal half of the protein is sufficient for binding to its ligand a-agglutinin. alpha-Agglutinin20-351, a fully active fragment of the protein, has been purified and analyzed. Circular dichroism spectroscopy, together with sequence alignments, suggest that alpha-agglutinin20-351 consists of three immunoglobulin variable-like domains: domain I, residues 20-104; domain II, residues 105-199; and domain III, residues 200-326. Peptide sequencing data established the arrangement of the disulfide bonds in alpha-agglutinin20-351. Cys97 is disulfide-bonded to Cys114, forming an interdomain bond between domains I and II. Cys202 is bonded to Cys300, in an atypical intradomain disulfide bond between the A and F strands of domain III. Cys227 and Cys256 have free sulfhydryls. Sequencing also showed that at least two of three potential N-glycosylation sites with sequence Asn-Xaa-Thr are glycosylated. At least one of three Asn-Xaa-Ser sequences is not glycosylated. No residues NH2-terminal to Ser282 were O-glycosylated, whereas Ser282, and all hydroxy amino acid residues COOH-terminal to this position were modified. Therefore O-glycosylated Ser and Thr residues cluster in the COOH-terminal region of domain III, and the O-glycosylation continues into a Ser/Thr-rich sequence that extends from domain III to the COOH-terminal of the full-length protein.

Agglutinins↗
PubMed1995

[Contribution and role of the scanner in the preoperative evaluation of chronic otitis. Radiosurgical correlation apropos of 85 cases].

High resolution computed tomography (CT) is today the best imaging to study chronic middle ear diseases. In a retrospective analysis of 85 chronic otitis media (cholesteatoma or not), the authors emphazise the diagnostic value of CT scan, its preoperative's role and the radiologic imaging of cholesteatoma. In our study, the radiosurgical correlation rate is 0.6 regarding positive diagnosis in chronic otitis or cholesteatoma. The malleus and incus analysis is correct, but stapes is not observed in 40% of cholesteatoma. The correlation of surgical and radiographic findings is excellent regarding the scutum, the horizontal semicircular canal (> 0.7), the tegmen (= 0.6), bad for the canal of facial nerve (< 0.5). The actual extent of chronic otitis media lesions is overestimated by CT scan in 70% of cases. The correlation's rate is reliable for epitympanum and aditus. To conclude, the preoperative CT is necessary in those cases: closed eardrum cholesteatoma, single functional ear, clinical complications and doubtful diagnosis.

Adolescent↗
PubMed1994

Twice daily cefpodoxime proxetil compared with thrice daily amoxicillin/clavulanic acid for treatment of acute otitis media in children.

A total of 260 children, 3 months to 11 years old (median age 24 months), with acute otitis media (AOM) received either cefpodoxime proxetil (CP) 8 mg/kg/d b.i.d. or amoxicillin/clavulanic acid (ACA) 40/10 mg/kg/d t.i.d. for 8 days. A significant difference in clinical cure rates was observed between the CP group 71/118 (60%) and the ACA group 42/105 (40%), p = 0.003. At the follow-up visit (20-30 days after the start of treatment), significant advantages were recorded with the CP vs. ACA therapy, in terms of satisfactory clinical response [90/111 (81%) vs 60/94 (63.8%), p = 0.005] residual middle ear effusion (14.4% vs 28.7%, p = 0.01) and normal tympanometry (78% vs 61.4%, p = 0.017). Compliance and adverse event frequency were the same in both treatment groups. The higher clinical cure rate and equivalent safety profile of CP indicates that it is an acceptable alternative to ACA for the treatment of AOM in children.

Acute Disease↗