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Biomedical subjects

G Stuart

Publications and source records attributed to G Stuart.

65 records · Page 4Linked to original sources

Pleomorphic xanthoastrocytoma: report of two cases.

Two cases of pleomorphic xanthoastrocytoma are presented to draw attention to this relatively benign variant of glioma. The circumscribed tumors, each with a cystic component, were located superficially, one in the mesial right temporal lobe and one in the right temporoparietal region. The patients were aged 12 and 14 years, and it is now almost 7 years since the onset of symptoms in the 12-year-old boy. The optimal plan of management is discussed.

Adolescent↗

Evidence that trypsin digestion exposes a channel in the sarcoplasmic reticulum membrane.

We present evidence that proteolytic digestion of sarcoplasmic reticulum membranes with trypsin exposes an ionophore that is capable of translocating calcium across the membrane of preloaded vesicles. Net transport of calcium appears to stop when the chemical potential of the ion on both sides of the membrane is equal. The temperature coefficient of steady-state leakage suggests that the ionophore is of the channel or pore type. We suggest that tryptic digestion exposes a channel in sarcoplasmic reticulum membranes through which calcium, and perhaps other ions as well, can diffuse down concentration gradients.

Adenosine Triphosphate↗

Improved survival of patients with glioma in the CT era.

At the RoyaL Brisbane Hospital, 143 patients with intracranial gliomas were analyzed in a retrospective study, to evaluate the impact of the CT scanner upon their diagnosis, management and survival. 95 were diagnosed before and 48 after CT became available. There was a significant reduction in the number of invasive diagnostic procedures performed in the CT era; cerebral angiograms by 67%, pneumoencephalograms by 82% and exploratory craniotomies by 65%. However, the total number of diagnostic investigations and the time taken to establish a diagnosis of glioma were not significantly decreased. Surgery was performed less frequently and with a lower complication and mortality rate than in the pre-CT era; there was a slightly increased use of chemotherapy. The number of patients having arteriography as a follow-up procedure was reduced by 80% and no follow-up pneumoencephalograms have been performed since CT was introduced. The average duration of hospitalization has remained unchanged. Survival times has increased significantly during this time, most markedly in the younger groups. The possible role of CT in this improvement is discussed.

Brain Neoplasms↗

Cerebral metastatic melanoma presenting as spastic paraparesis.

A case of bilateral deposits from melanoma in the posterior frontal parasagittal region of the brain is recorded. A mechanism to explain the mode of spread is suggested. C.T. head scanning in patients with disseminated malignancy should be considered prior to invasive investigations or major surgical procedures.

Adult↗

Immigrant status and gender effects on psychopathology and self-concept in adolescents: a test of the migration-morbidity hypothesis.

Evidence for a relationship between immigrant status and psychological morbidity (which we shall refer to as the "migration-morbidity" hypothesis) in adolescents is variable and inconclusive. The present study tests this hypothesis and also explores gender differences in self-reported psychopathology and self-concept measures. Native-born Australians, Australian-born adolescent children of immigrants, and immigrant and refugee adolescents are compared on a number of relevant measures. The results do not support the migration-morbidity hypothesis. However, Vietnamese refugee adolescents had poorer self-concept than the other groups.

Acculturation↗

Long-term follow-up confirms a survival advantage of the paclitaxel-cisplatin regimen over the cyclophosphamide-cisplatin combination in advanced ovarian cancer.

Two independent and consecutive randomized clinical trials, conducted by the American Gynecological Oncology Group and by an European-Canadian Intergroup, have shown superiority, in clinical response rate, progression-free survival, and overall survival, of a cisplatin-paclitaxel regimen over cisplatin-cyclophosphamide given as first-line chemotherapy for women with advanced epithelial ovarian cancer. The results of these studies, published with a median follow-up of about 3 years, have been updated with a 6.5-year follow-up: In each case, an 11% absolute gain in survival favoring the paclitaxel arm is shown; this advantage remains both statistically and clinically significant and supports a role for paclitaxel in frontline chemotherapy for advanced ovarian cancer.

Antineoplastic Combined Chemotherapy Protocols↗

First-line treatment of ovarian cancer FIGO stages IIb-IV with paclitaxel/epirubicin/carboplatin versus paclitaxel/carboplatin.

The objective of this study was to compare the safety and efficacy of carboplatin plus epirubicin and paclitaxel (TEC) to carboplatin and paclitaxel (TC), in the treatment of epithelial ovarian, peritoneal, or tubal carcinoma. Between March 1999 and August 2001, 887 patients were randomized to receive six to nine cycles of paclitaxel (175 mg/m2, 3 h intravenously) followed by carboplatin (AUC 5, Calvert formula) with or without epirubicin (75 mg/m2 intravenously prior to paclitaxel), on a 3-weekly schedule. The primary endpoint was progression-free survival. Demographic information: Residual disease <1 cm was reported on 41% of patients. At the end of treatment, 65% in the TEC and 55% in the TC arm had achieved a clinical complete response, and 18 and 25% a clinical partial response resulting in an overall response rate of 83% in the TEC and 80% in the TC arm, whereas 7 and 9% had progressive disease, respectively. The three-drug combination produced a markedly higher myelotoxicity, resulting in a higher frequency of febrile neutropenia (12.5% of the TEC and 1.5% of the TC patients) and a higher number of dose reductions and treatment delays. Cycle prolongation above seven days was seen in 7 and 5% of cycles in the TEC and TC arm, respectively. Stomatitis > or = grade 3 was also higher with TEC (4% TEC and 0.5% TC). Reductions in left ventricular ejection fraction of more than 15% after six courses were slightly more common with the TEC regimen (3% versus 1.5%), but the difference was not statistically significant (P = 0.2). In conclusion, treatment with the TEC combination produced a higher rate of complete responses than treatment with the TC combination. Toxicity was manageable. Long-term survival data are awaited.

Adult↗

Attending nurses.

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Consultants↗

Peritoneal dialysis.

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Acute Kidney Injury↗