Biomedical subjects

John Hutson

Publications and source records attributed to John Hutson.

7 recordsLinked to original sources

PubMed2005

Preliminary report on the International Conference for the Development of Standards for the Treatment of Anorectal Malformations.

BACKGROUND: Anorectal malformations (ARM) are common congenital anomalies seen throughout the world. Comparison of outcome data has been hindered because of confusion related to classification and assessment systems. METHODS: The goals of the Krinkenbeck Conference on ARM was to develop standards for an International Classification of ARM based on a modification of fistula type and adding rare and regional variants, and design a system for comparable follow up studies. RESULTS: Lesions were classified into major clinical groups based on the fistula location (perineal, recto-urethral, recto-vesical, vestibular), cloacal lesions, those with no fistula and anal stenosis. Rare and regional variants included pouch colon, rectal atresia or stenosis, rectovaginal fistula, H-fistula and others. Groups would be analyzed according to the type of procedure performed stratified for confounding associated conditions such as sacral anomalies and tethered cord. A standard method for postoperative assessment of continence was determined. CONCLUSIONS: A new International diagnostic classification system, operative groupings and a method of postoperative assessment of continence was developed by consensus of a large contingent of participants experienced in the management of patients with ARM. These methods should allow for a common standardization of diagnosis and comparing postoperative results.

Anal Canal↗

PubMed2005

The role of hepatocyte growth factor in the humoral regulation of inguinal hernia closure.

BACKGROUND: Calcitonin gene-related peptide (CGRP) is proposed to indirectly cause inguinal hernia closure via hepatocyte growth factor (HGF). Studies have shown that CGRP and HGF cause processus vaginalis (PV) fusion in vitro. We localized the HGF receptor in the PV and tested whether CGRP was responsible for HGF release. METHOD: Hernial sacs collected from 20 children (15 males, 4 females, 1 XY female) undergoing inguinal hernia repair were immunohistochemically stained for HGF receptor (c-met). Parietal peritoneum was stained for comparison. Hernial sacs from another 16 children (12 males, 4 females), with each sac divided into 4, were cultured, with and without CGRP, for 24 and 48 hours. Hepatocyte growth factor content was then assayed in the culture medium (4/16 children) and tissue extracts (12/16 children), using enzyme-linked immunosorbent assay. Children were aged 1 month to 10 years. Data were analyzed using paired Student t tests. RESULTS: C-met localized to the PV epithelial surface in 17 of 20 hernial sacs and in the parietal peritoneum. Hepatocyte growth factor levels increased over time in 4 of 4 culture medium assays, with a significant difference in 1 of 4. Seven of 12 tissue extract assays had significant differences; however, 3 of 7 had decreased HGF levels. CONCLUSION: The presence of HGF receptors in the PV is consistent with a role for HGF in triggering epithelial-mesenchymal transformation during inguinal hernia closure. The presence of HGF receptors in the parietal peritoneum suggests that regulation of this process is complex. Enzyme-linked immunosorbent assay results indicate that, in a subset of patients, exogenous CGRP may be responsible for HGF elevation and potentially implicates deficient endogenous CGRP as one cause for inguinal hernia patency.

Calcitonin Gene-Related Peptide↗

PubMed2005

Cosmetic and anatomic outcomes after feminizing surgery for ambiguous genitalia.

BACKGROUND: Reports on anatomic and cosmetic outcomes after genital surgery for children with ambiguous genitalia are mixed, with recent reports using standardized assessments suggesting poor outcomes and that multiple operations may be required. METHODS: All children with ambiguous genitalia and who had feminizing surgery at the Royal Children's Hospital in Melbourne, Australia, were identified. Standardized genital assessment was undertaken at their clinical review after informed consent. Underlying diagnosis, number and type of procedures performed, and the expertise of the surgeon were recorded from their medical notes. RESULTS: Of 32 patients examined aged 13 to 33 years, 47% had congenital adrenal hyperplasia. Ten patients had initial surgery performed elsewhere. Overall, there were good anatomic and cosmetic outcomes for those initially treated at our institute by a specialized surgeon, although some required additional intervention in adolescence or adulthood. Initial surgery before or after 2 years of age did not significantly affect outcomes. Those patients who had only 1 operation (by a surgeon with special interest in intersex) had better cosmetic and anatomic outcomes than those patients who had multiple operations. CONCLUSIONS: Cosmetic and anatomic outcomes of surgery for ambiguous genitalia were generally good when undertaken by pediatric surgeons with specific expertise in intersex surgery.

Adolescent↗

PubMed2005

Pilot study using transcutaneous electrical stimulation (interferential current) to treat chronic treatment-resistant constipation and soiling in children.

BACKGROUND: Chronic constipation in children may have organic or behavioral causes. The purpose of the present study was to investigate the effect of treatment with transcutaneous electrical stimulation (using interferential current) in children with chronic treatment-resistant constipation with proven organic disorders. METHODS: Eight children (7-16 years) with at least 4 years of chronic treatment-resistant constipation and soiling, who had failed diet, laxative treatment and behavioral therapy were given 1 month of transcutaneous electrical stimulation. The three most severe cases had appendicostomies with antegrade washouts every 2-3 days to prevent impaction and reduce their soiling. Children and carers kept a daily diary of bowel habits, recording number of spontaneous defecations, episodes of soiling, use of bowel washouts and medications. Transcutaneous stimulation using interferential current was applied three times per week for 3-4 weeks using four surface electrodes, two to the paraspinal area of T9-10 to L2 and one to either side of the anterior abdominal wall beneath the costal margin. Diaries were recorded for 1 month before, during, and after stimulation and for 2 weeks 3 months later. RESULTS: Transcutaneous electrical stimulation using interferential current stopped soiling in 7/8 children and increased the frequency of spontaneous defecations in 5/8. Defecations remained high and soiling low for 3 months in 3/6 children (with data). CONCLUSIONS: These results suggest that transcutaneous electrical stimulation using interferential current has a beneficial effect for children with chronic treatment-resistant constipation. Further trials using larger series of patients are needed to confirm this benefit, to determine the ideal stimulation parameters and to investigate why electrical stimulation might be effective.

Adolescent↗

PubMed2005

A long-term outcome study of intersex conditions.

CONTEXT: Clinical management of intersex conditions is controversial because the available evidence is limited and conflicting, with no long-term population based studies comparing matched controls. OBJECTIVE: To assess the long-term psychological, sexual and social outcomes of patients with intersex compared with two matched control populations. DESIGN, SETTING AND PARTICIPANTS: Three different aged-matched (18-32 years) patient groups completed a self-administered questionnaire of established quality of life and well-being inventories measuring physical' health, psychological adjustment and sexuality, following a mail-out to all identified patients. The intersex group (n = 50) and the Hirschsprung disease, a congenital disorder, control group (n = 27), were patients who had attended the Royal Children's Hospital, a tertiary centre, for their clinical care. The insulin dependent diabetes mellitus control group was recruited from an adult tertiary hospital. The study was conducted at the hospital-based Murdoch Childrens Research Institute. MAIN OUTCOME MEASURES: Psychological, sexual and social outcomes. RESULTS: The intersex group did not differ from controls on physical or mental health, depression, state anxiety, neuroticism, psychoticism or stressful life events. Intersex participants were satisfied with their overall body appearance, although intersex males were less satisfied than controls with the size (p <0.05) and appearance (p <0.01) of their sex organs. The intersex group was less likely to experience orgasm (p <0.05), tended to experience more pain during intercourse (p = 0.06), had more difficulties with penetration (p <0.01) and were less likely to have sexual activity several times or more a week (p <0.05) than the combined control groups. Intersex participants did not differ from controls in level of sexual desire or enjoyment of sexual activities. CONCLUSIONS: Most patients with intersex had positive psychosocial and psychosexual outcomes, although some problems were reported with sexual activity. These results overall suggest that a model of care including early genital surgery carried out at a centre of excellence with a multidisciplinary team can minimize long-term complication rates.

Adolescent↗

PubMed2005

The adsorption of cyanobacterial hepatoxins as a function of soil properties.

Cyanobacterial hepatotoxins present a risk to public health when present in drinking water supplies. Existing removal strategies, although efficient, are not economically viable or practical for remote Australian communities and developing nations. Bank filtration is a natural process and a potential low cost, toxin removal strategy. Batch studies were conducted in 12 texturally diverse soils to examine the soil properties influencing the adsorption of the cyanobacterial hepatotoxins, microcystin-LR and nodularin. Sorption isotherms were measured. Freundlich and linear isotherms were observed for both toxins with adsorption coefficients not exceeding 2.751 kg(-1) for nodularin and 3.81 kg(-1) for microcystin. Significant positive correlations were identified between hepatotoxin sorption and clay and silt contents of the soils. Desorption of toxins was also measured in three different soils. Pure nodularin and microcystin-LR readily desorbed from all soils.

Adsorption↗

PubMed2004

Gonadal dysgenesis with a difference.

We report here an exceptional clinical finding of a 46,XY phenotypic female with complete gonadal dysgenesis, but who was found unexpectedly to have absence of the uterus and posterior vagina. Extensive review of current and past literature failed to confirm other reports of this variant form of complete gonadal dysgenesis.

Amenorrhea↗