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Biomedical subjects

N Bhattacharyya

Publications and source records attributed to N Bhattacharyya.

At least 19 recordsLinked to original sources

A rare case of diffuse neonatal hemangimatosis.

Diffuse neonatal hemangiomatosis (DNH) is a rare neonatal condition in which cutaneous and visceral hemangiomas coexist. If left untreated, DNH is usually fatal at an early age. We report a case of a 6-month-old male infant who was brought to our institution with hepatosplenomegaly and a history of anemia and thrombocytopenia since 1 month of age. Cytogenetic analysis and liver biopsy were normal and bone marrow aspirate was nondiagnostic. Congenital red blood cell abnormality was ruled out. Ultrasound confirmed an increase in size of the spleen from 5 to 15 cm, and magnetic resonance imaging demonstrated intense splenic enhancement consistent with a hemangioma or vascular malformation. Despite severe thrombocytopenia, an exploratory laparotomy was done and the patient underwent a splenectomy and omentectomy. The final pathology confirmed hemangiomatosis of the spleen and omentum. In the neonate with unexplained anemia and thrombocytopenia, DNH should be considered as part of the differential diagnosis. In our case, the patient not only exhibited no obvious cutaneous involvement, but also had rare splenic involvement. Although there are risks involved when operating on a thrombocytopenic patient, the benefits of operating on a patient with DNH far outweigh the risks, and operative intervention should proceed without delay.

Hemangioma↗

Paediatric immunisation: special emphasis on measles and MMR vaccinations.

The dictum, 'prevention is better than cure', is applicable to all ailments but it can be most easily followed for infectious diseases, increasing numbers of which are being contained by specific vaccinations since the first discovery of smallpox vaccine by Edward Jenner in 1796. Advances in immunology and laboratory techniques including cell culture, genetic engineering and animal experiments have contributed significantly to the production of more and more vaccines, used successfully in preventive programmes. Infectious diseases are widely prevalent in the developing countries. The child population is specially vulnerable to many of them. These infections contribute to high morbidity and mortality and immunisation programmes have been undertaken as preventive measures against them at the national level. Paediatricians and experts are actively engaged in formulating and improving these programmes as problems are faced in their implementation. Much new information is continuously being available in the literature, mostly in specialised journals. The general practitioners, particularly those serving in the remote and vast rural areas, are not likely to have access to these recent developments which they need for self-motivation in initiating the parents with confident advice to have their children properly immunised and also for tackling effectively any problem arising out of immunisation. This paper attempts to discuss the subject of paediatric immunisation with special emphasis being laid on measles and MMR vaccinations.

Adolescent↗

A novel role of XRCC1 in the functions of a DNA polymerase beta variant.

In the base excision repair pathway, wild-type DNA polymerase beta (WT polbeta) provides most of the gap filling synthesis. A truncated polbeta protein (polbetaDelta), expressed in primary colorectal and breast tumors and in a primary culture of renal cell carcinoma, inhibits the gap filling synthesis and DNA binding activities of WT polbeta. However, a purified recombinant polbetaDelta does not inhibit a purified WT polbeta. To determine the dominant inhibitory activity of polbetaDelta, we examined interactions of purified polbetaDelta with X-ray cross complementing group 1 (XRCC1), poly(ADP-ribose) polymerase (PARP), and apurinic endonuclease (Ape) proteins. All of these proteins interact with polbetaDelta in vitro and in vivo. The polbetaDelta protein can fill one nucleotide gap by inserting a base at the AP site, whereas a presumed binary complex of polbetaDelta and XRCC1 cannot. However, this binary complex not only suppresses gap filling synthesis activity of WT polbeta but also binds more strongly to gapped DNA than WT polbeta bound to XRCC1. These results are the first to suggest that XRCC1 is directly involved in the dominant negative activity of truncated polbeta, possibly leading to the genomic instability characteristic of tumor cells.

Animals↗

Impaired repair activity of a truncated DNA polymerase beta protein.

DNA polymerase beta (polbeta) is an essential enzyme for gap filling synthesis in damaged DNA template involved in base excision repair pathway. A truncated polbeta protein is expressed in primary colorectal and breast adenocarcinomas. To determine a possible alteration in the functions of the enzyme, a human cell line named HeLapolbetadelta expressing the truncated form of polbeta has been established. These cells revealed a significantly reduced level of repair activity evaluated by gap filling synthesis and polbeta activity. More importantly, the HeLapolbetadelta cells are hypersensitive to MNNG, a DNA alkylating agent. It appears from the responses that the gap filling synthesis of WT cells, a HeLa cell line overexpressing wild-type polbeta protein, was inhibited by HeLapolbetadelta protein.

Cell Survival↗

Efficacy and quality-of-life impact of adult tonsillectomy.

OBJECTIVE: To determine the quality-of-life impact and overall efficacy of adult tonsillectomy for chronic tonsillitis. DESIGN: Cross-sectional survey analysis of patients at least 1 year after undergoing adult tonsillectomy. INTERVENTIONS AND OUTCOME MEASURES: The Glasgow Benefit Inventory was used to quantify the health benefit of tonsillectomy. Data were collected for demographics and antibiotic use, physician visits, and workdays missed due to chronic tonsillitis for the 12 months before and after tonsillectomy. RESULTS: Sixty-five patients returned completed surveys. Mean age was 27.3 years, and mean follow-up was 42.6 months. The improvements in the total score (+27.1), general health subscore (+34.7), social functioning subscore subscore (+14.4), and physical functioning subscore (+9.5) of the Glasgow Benefit Inventory were each statistically significant (P<.001), indicating a significant health benefit of tonsillectomy. Statistically significant decreases in mean weeks receiving antibiotics (-7.8 weeks), mean physician visits (-5.4), and mean workdays missed (-6.3 days) were noted after tonsillectomy (P<.001). CONCLUSIONS: Adult tonsillectomy provides a significant quality-of-life improvement for patients with chronic tonsillitis. Tonsillectomy also affords decreases in medical resource utilization and missed workdays after tonsillectomy. Such factors should be incorporated into decision making when considering tonsillectomy.

Adult↗

Benchmarks for mortality, morbidity, and length of stay for head and neck surgical procedures.

OBJECTIVE: To determine benchmarks and factors that influence morbidity, mortality, and length of stay (LOS) for head and neck surgical procedures. METHODS: A specific database for head and neck surgical procedures was extracted from the National Hospital Data Survey database for 1995 through 1997. Records of inpatient admissions for patients undergoing head and neck surgery were examined to determine demographics, incidence of medical complications, mortality, and LOS. Data were statistically examined for the influence of medical complications on mortality and LOS. RESULTS: A total of 3932 patients underwent head and neck procedures. The overall medical morbidity and mortality rates were 5.65% and 2.98%, respectively. The presence of a major medical complication increased the odds of death by 5.65 (P<.001). Postoperative pneumonia was the most common medical complication (3.26%) and was associated with a mortality rate of 10.94% (odds ratio for mortality, 4.4). Acute myocardial infarction and stroke were rare (combined incidence, 1.86%) and were not statistically associated with increased mortality. Procedures that involved the esophagus carried the highest mortality rate (8.38%). The overall mean LOS was 6.15 days. This increased to 17.7 days when a major medical complication occurred (P<.001). Increasing age was associated with increased rates of medical complications and mortality (P<.001). CONCLUSIONS: Medical complications in patients undergoing head and neck surgical procedures are associated with increased mortality rates and longer LOS. Mortality rates in head and neck surgery are low but may be improved by preventing medical complications.

Age Factors↗

Impact on quality of life of botulinum toxin treatments for spasmodic dysphonia and oromandibular dystonia.

OBJECTIVE: To determine the impact on quality of life of botulinum toxin treatments for common dystonias of the head and neck. DESIGN: Cross-sectional survey study of a patient cohort treated with botulinum toxin injections for spasmodic dysphonia (SD) or oromandibular dystonia (OMD). INTERVENTIONS AND OUTCOME MEASURES: The Glasgow Benefit Inventory was used to quantify the health benefit of treatment. Data were collected for demographics, time intervals relative to diagnosis, treatment duration, and frequency of injections. The groups were compared to determine whether differences existed in benefit from treatment. Correlation analysis was conducted for inventory scores and time intervals. RESULTS: A total of 23 patients (5 with OMD and 18 with SD) completed the questionnaire. The mean total benefit score was +38.04 (possible range, -100 to +100) for the whole group (P<.001). The OMD group derived a nonsignificantly smaller benefit (+21.67 vs +42.59) (P =.07). The mean subscores for the combined group were +39.67, +26.81, and +42.75 for the general, social support, and physical health subscores, respectively (P< or =.001). The difference in mean subscores between the 2 groups was not statistically significant, although patients with OMD had a lower social support subscore (+6.67 vs. +32.41). No correlation was found between duration of therapy or frequency of injections and the Glasgow Benefit Inventory score. CONCLUSIONS: Patients with OMD or SD derive considerable benefit when treated with botulinum toxin. The magnitude of benefit is largely independent of the time course of therapy. Treatment with botulinum toxin for these conditions is effective on the basis of quality-of-life criteria.

Adult↗

Tissue eosinophilia in chronic sinusitis: quantification techniques.

OBJECTIVE: To ascertain the reliability of a proposed method for quantifying tissue eosinophilia in sinus mucosa. DESIGN: Prospective cohort study. INTERVENTIONS AND OUTCOME MEASURES: Pathology slides from patients undergoing endoscopic sinus surgery for chronic rhinosinusitis were independently assessed by 2 reviewers. Using a proposed systematic counting method, the degree of tissue eosinophilia was quantified. Disease severity was assessed by computed tomographic (CT) staging. Intrarater, interrater, and intrapatient reliability was determined using correlational reliability analysis. The degree of correlation between tissue eosinophilia and CT stage was determined. RESULTS: One hundred thirty-two slides from 65 patients were reviewed. The mean (SD) eosinophil density was 23.4 (37.2) eosinophils per high-power field. Only 12 patients (18%) had no eosinophils on histopathologic analysis. Strong intrarater (r> or =0.91 for each rater, P<.001) and interrater reliability (r> or =0.82 between raters, P<.001) was noted for the quantification method. A moderate degree of correlation was found between CT scan stage and degree of tissue eosinophilia (Spearman rho = 0.62, P<.001). CONCLUSIONS: The proposed method for quantifying tissue eosinophilia in sinus mucosa is reliable and valid. A relatively strong correlation exists between CT scan stage and tissue eosinophilia in chronic rhinosinusitis.

Chronic Disease↗

Academic otolaryngology in the new millennium: Are we falling behind?

OBJECTIVE: To determine if differences in publication rates have evolved over the past 3 decades for academic otolaryngologists. METHODS: Three random samples with 50 academic otolaryngologists each were studied. These otolaryngologists completed training in 1 of the 3 time periods (1970-74, 1980-84, 1990-94) studied. Articles published within the first 5 years after graduation were tabulated and statistically analyzed. RESULTS: Academic otolaryngologists graduating in the 1970s, 1980s, and 1990s averaged 8.7, 8.9, and 6.4 publications during their first 5 years of academic practice, respectively. The first 2 cohorts averaged 5.4 and 5.7 publications in the 4 major otolaryngology journals, versus 3.3 for 1990s graduates. Basic science publications increased for 1990s graduates over those of the 1970s and 1980s graduates. The percentage of first author articles remained stable. Despite these trends, only the drop in case reports was statistically significant (P = 0.023, ANOVA). CONCLUSION: Trends may be developing that predict decreasing publication rates for newly trained otolaryngologists entering academic practice.

Adult↗

Determination of the "incidental" Lund score for the staging of chronic rhinosinusitis.

OBJECTIVE: Determine normative values for the Lund score for computed tomographic (CT) scans of the paranasal sinuses. METHODS: Patients undergoing CT of the paranasal sinus region for nonsinusitis causes were evaluated and staged according to the Lund-MacKay system. Complete and near complete Lund scores were computed from these scans and the frequencies of incidental paranasal abnormalities were tabulated. RESULTS: A total of 199 patients who underwent CT scans of the internal auditory canals, pituitary, or orbits demonstrated adequate visualization of the paranasal sinuses. In 91 patients, the imaging was sufficient to compute a complete Lund score with a mean of 4.26 (95% CI, 3.43 to 5.10). In 130 patients, all sinuses were adequately imaged except for the ostiomeatal complex. For this near complete group, the mean prorated Lund score was 4.26 (95% CI, 3.55 to 4.97). Both of these scores differed significantly from an expected score of zero (P < 0.001). CONCLUSIONS: The Lund score in the general population is not 0. A Lund score ranging from 0 to 5 may be considered within an incidentally "normal" range, and should be factored into clinical decision-making.

Adolescent↗

Evaluation of post-tonsillectomy bleeding in the adult population.

A retrospective review of a consecutive series of 685 adult patients undergoing tonsillectomy was conducted. Determinations were made of the post-tonsillectomy bleeding rate, the need for intervention to control bleeding, and the blood transfusion rate. Statistical analysis was used to determine whether bleeding rates differed according to three criteria: gender, indication for tonsillectomy, and age. Post-tonsillectomy bleeding occurred in 35 patients (5.1%); five of these patients experienced bleeding during the first 24 hours postoperatively, and the remaining 30 experienced delayed bleeding. When it occurred, the mean time lapse between tonsillectomy and bleeding was 6.9 days (+/- 4.1). Twenty of the 35 patients (57.1%) required a procedure to control their bleeding, but no patient required a transfusion. There was no statistically significant difference in bleeding rates based on gender, the indication for surgery (chronic tonsillitis, obstructive sleep apnea syndrome, or to rule out neoplasia), and age. These results indicate that (1) post-tonsillectomy bleeding occurs in approximately 1 of 20 adults independent of individual patient characteristics, (2) more than half of patients who bleed are likely to require a procedure to control their hemorrhage, and (3) the need for transfusion is distinctly unlikely.

Adolescent↗

Do maxillary sinus retention cysts reflect obstructive sinus phenomena?

OBJECTIVE: To determine the relation of maxillary sinus retention cysts (RCs) to ostiomeatal complex (OMC) obstruction and anatomic variation of the paranasal sinuses. METHODS: The results of 410 computed tomographic scans of the sinuses ordered by otolaryngologists in an academic center during a 1-year period were reviewed. Computed tomographic scans with maxillary sinus RCs were studied to determine cyst characteristics, the Lund score, OMC size and patency, and the presence of anatomic variations. Statistical analysis was conducted to determine the relation of RCs to these factors. RESULTS: The incidence of RCs was 12.4% (51 cases). The mean patient age was 41.3 years, with a female-male ratio of 2.4:1. Nine cases demonstrated bilateral cysts, allowing 42 unilateral cases to be analyzed with the nondiseased side as a control. The mean cyst size was 1.56 cm, and cysts were most commonly located inferiorly (30 [50%]) and were solitary (45 [88%]). The RC side had a higher mean Lund score than the control side (2.62 vs 1.93; P =. 008, Wilcoxon signed rank test). Of the cyst sides, 18 (43%) demonstrated OMC occlusion, vs 15 (36%) for the control side (P =.55, McNemar test). The mean OMC size was smaller for the cyst side vs the control side (0.77 vs 1.35 mm; P =.13). No association was found between RCs and concha bullosa or Haller cells (P =.45 and P =.39, respectively). CONCLUSIONS: Maxillary sinus RCs do not reflect persistent obstructive pathology of the OMC, and are not associated with potentially obstructive anatomic sinus variations. Consideration should be given to not scoring RCs as positive disease during Lund staging.

Adult↗

Defective DNA repair genes in a primary culture of human renal cell carcinoma.

PURPOSE: Genomic stability is maintained by error-free DNA replication, repair, and recombination. To determine if repair genes contribute to genomic instability, we used a newly established cell line RCC-AJR (from clear-cell renal cell carcinoma) to examine hMSH2 (a mismatch-repair gene) and the gene encoding DNA beta polymerase (polbeta; a known contributor to base-excision repair). METHODS: Coding sequences of hMSH2 and polbeta were amplified by the polymerase chain reaction (PCR) using RNA from RCC-AJR cells and matched normal kidney (NK) cells from the same patient. Nucleotide sequences of the PCR products were determined by the dideoxy-DNA method and direct sequencing. Expressions of repair genes were assayed by Western blotting. Microsatellite stability in RCC-AJR cells was assayed by alteration in (CA)n repeats. RESULTS: In the RCC-AJR cells, we detected (a) a deletion of 1476 bp encoding 492 amino acids of hMSH2 cDNA, (b) an 87-bp deletion in the polbeta coding sequence, (c) truncated forms of hMSH2 and polbeta proteins, and (d) microsatellite instability. CONCLUSIONS: This study provides evidence of alterations in hMSH2 and polbeta in the homogeneous cell population of an RCC-AJR tumor culture. The data indicate that repair genes may help preserve genomic stability in this cell line. We believe that this new primary RCC-AJR cell line will prove a useful model for investigating the cascade of genetic events in renal cells that leads to renal carcinogenesis.

Carcinoma, Renal Cell↗

Predictors of airway intervention in angioedema of the head and neck.

OBJECTIVE: Records of patients presenting with angioedema of the head and neck were analyzed to determine clinical factors that predict the need for airway intervention. METHODS: A review of patients with angioedema of the head and neck over a 10-year period was conducted. Data were collected regarding demographics, cause of edema, and sites of involvement. A logistic regression model was used to ascertain whether any clinical variables were significant in predicting the need for airway intervention. RESULTS: Review of 138 charts with an admitting diagnosis of angioedema yielded 66 cases of angioedema of the head and neck in 48 patients. Twenty-three (34.8%) patients required airway intervention. Logistic regression identified increasing age and angioedema involving the oral cavity/oropharynx as predictors of airway intervention; involvement of other sites, cause, and sex were not predictive. CONCLUSION: Location of edema and patient age predict which patients with angioedema of the head and neck are likely to require airway intervention.

Adult↗

Assessment of the airway in obstructive sleep apnea syndrome with 3-dimensional airway computed tomography.

OBJECTIVE: The goal was to evaluate 3-dimensional airway CT for upper airway assessment in obstructive sleep apnea syndrome (OSAS). DESIGN: Airway CT was obtained and 3-dimensional airway models were constructed prospectively for 40 patients with OSAS and 10 controls. Airway dimensions were correlated with polysomnography, and comparison was made between patients with and without OSAS. RESULTS: OSAS patients had a mean respiratory distress index of 51.9 events per hour. The mean minimum cross-sectional area (XSA) in the neutral position was 67.1 mm(2). Minimum XSA decreased in both the inspiratory and expiratory phases to 16.3 mm(2) and 15.0 mm(2), respectively (P<0.001). Complete airway obstruction occurred in 1 or more phases of respiration in 28 patients. Neither airway XSA nor length of obstruction correlated with sleep apnea parameters. No statistically significant differences in airway dimensions were found between OSAS and control patients. CONCLUSIONS: Airway CT demonstrates dynamic airway obstruction in OSAS but does not correlate well with clinically important disease parameters.

Adult↗

Increased female authorship in otolaryngology over the past three decades.

OBJECTIVE: To identify changing trends in female authorship and publication in the otolaryngology literature. METHODS: All articles published in the four major otolaryngology journals in each of the years 1978, 1988, and 1998 were reviewed. The authorship panel of each article was examined for number of authors, gender, educational degree category, and subspecialty area of publication. Data were analyzed for trends in female authorship and the association of gender with the other design variables. RESULTS: A total of 2,463 articles were analyzed. The average percentage of female authorship increased from 4.1% in 1978 to 8.7% in 1988 and 12.4% in 1998, and the percentage of articles with a female "first author" increased from 3.2% to 7.4% and 11.4% for the same years, respectively. Each of these increases was statistically significant (P < .001). The weighted rank of female authorship also increased from 0.063 to 0.164 and 0.243 for the same years, respectively (P < .001). With respect to subspecialty publication, women were first authors of 14.7% of articles concerning pediatric otolaryngology but accounted for 9.9% or less of the first authors in the other subspecialty areas (P < .001). Female authors were also much more likely to be nonphysicians (P < .001) than men. CONCLUSIONS: There has been a significant trend toward increased female authorship in the otolaryngology literature. A significant portion of this is accounted for by nonphysician female authors, and female authorship tends to be concentrated in pediatric otolaryngology.

Analysis of Variance↗

Transcriptional regulatory sequences within the first intron of the chicken apolipoproteinAI (apoAI) gene.

Previous studies demonstrated that the -82 to +87 nucleotides (nt) 5'-upstream region of the chicken apolipoprotein (apoAI) gene are necessary for maximum reporter chloramphenicol acetyl transferase (cat) gene activation in chicken hepatocarcinoma (LMH) cells [Bhattacharyya, N., Chattapadhyay, R., Oddoux, C., Banerjee, D., 1993. Characterisation of the chicken apolipoprotein A-I gene 5'-flanking region. DNA Cell Biol. 12, 597-604]. The -82 to +87nt contain the 5'-untranslated nt, part of the first intron, and the upstream regulatory sequences. In this study, we examined the role of the first intron in the transcriptional regulation of the chicken apoAI gene. Six different reporter cat gene constructs with or without part of the first intron were prepared and transfected into LMH, normal rat kidney (NRK) and human hepatocarcinoma (HepG2) cells. Cell extracts were prepared from each transfected cell line, and CAT activities were measured. All three cell-lines readily expressed CAT, indicating that transcriptional regulatory sequences are present within the first intron region of the chicken apoAI gene. In an enhancer assay, the first intron containing cat construct exhibited a 5.4-fold increase of reporter activity in NRK cells when compared to a SV 40 promoter containing cat plasmid, suggesting the presence of a moderate enhancer element within +29 to +87nt of the first intron. DNase I protection assays, electrophoretic mobility shift assays and binding experiments with nuclear proteins isolated from different chicken tissues and LMH cells showed interaction with +29 to +87nt. Nuclear proteins isolated from tissues like liver and intestine, that actively express apoAI gene, failed to interact with +29 to +87nt, whereas nuclear proteins isolated from tissues that are less active in apoAI gene expression readily interacted with this region. To show the binding of the LMH-specific trans-acting factors to the +50 to +68nt intron region, DNA-affinity chromatography step was performed by using 3H-labeled nuclear proteins. These studies demonstrate that the first intron region of the apoAI gene interacts with trans-acting proteins and plays an important role in transcriptional regulation of the apoAI gene.

Animals↗