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Biomedical subjects

D Crawford

Publications and source records attributed to D Crawford.

At least 73 records · Page 4Linked to original sources
PubMed1996

Gender differences in adolescent weight and shape-related beliefs and behaviour.

OBJECTIVE: To describe the beliefs, attitudes and behaviours of North Queensland adolescents about weight, weight loss and body shape, and to examine the influence of gender. METHODOLOGY: A questionnaire was used to survey 791 year 8 adolescents from private schools in north Queensland. RESULTS: Only 41% of the girls and 54% of the boys were satisfied with their weight; 52% of the girls and 27% of the boys wanted to lose weight; 52% of the girls thought their thighs were too fat and 26% of the boys thought their stomachs were too fat. When surveyed, 35% of the girls and 22% of the boys were trying to lose weight. CONCLUSIONS: The weight loss drive, so prevalent in our culture, is already apparent among 12-14 year old schoolchildren. The challenge is to prevent obesity without encouraging an accompanying obsession with weight loss; however, good information, appropriately delivered, may be insufficient without a change in cultural expectations and assistance from the fashion and advertising industries.

Adolescent↗
PubMed1995

Treatment with finasteride following radical prostatectomy for prostate cancer.

OBJECTIVES: The objective of this study was to evaluate the effect of finasteride (10 mg/d) or placebo on serum prostate-specific antigen (PSA) and recurrence rates in men with detectable PSA levels after radical prostatectomy. METHODS: A total of 120 men, 48 to 89 years old, previously treated with radical prostatectomy for prostate cancer within the past 10 years, with serum PSA levels between 0.6 and 10.0 ng/mL, with no evidence of skeletal metastasis on bone scan, and with no previous androgen deprivation therapy, were treated with 10 mg finasteride or placebo in a double-blind fashion for 12 months. After the first year, all patients were treated with finasteride for an additional 12 months. Primary endpoints were serum PSA levels and recurrence rates defined as positive bone scan or positive biopsy. RESULTS: Patients treated with finasteride had a delayed increase in serum PSA compared with placebo of approximately 9 months in the first year and 14 months by the end of the second year. Patients with baseline PSA levels less then 1.0 ng/mL had no significant increase in serum PSA during the 2 years of treatment. Fewer recurrences were observed in the finasteride group, but these differences were not statistically significant. Finasteride was well tolerated, and side effects were balanced between treatment groups. CONCLUSIONS: The results of this study indicate that treatment with finasteride delays but does not prevent the rise in serum PSA observed in untreated patients with detectable PSA levels after radical prostatectomy. The reduction in local and distant recurrences in the finasteride group suggests that the effect on PSA reflects a direct effect on tumor growth without affecting the initial response to subsequent hormonal therapy. These data require confirmation by studies that are longer and larger, focused on demonstrating significant differences in progression rates and survival before the use of finasteride can be considered as an option for men with detectable PSA levels after radical prostatectomy.

Aged↗
PubMed1994

The behavioural epidemiology of weight control.

Excess body weight is associated with increased health risk, but there are also risks to health related to weight-control practices. While representative population data are available on the anthropometry of body weight and its sociodemographic correlates in Australia, less is known about the population prevalence and correlates of weight-control behaviours. We examine the prevalence of overweight and obesity, and low body weight, in the Australian population, using data from studies in which height and weight have been objectively measured; we describe the sociodemographic correlates of overweight and obesity; we outline relevant aspects of Australian health-system and private-sector approaches to body weight control; and we describe the findings of Australian studies of weight-control practices and related beliefs and attitudes. These findings relate mainly to women, particularly younger women, and little is known about the weight-control practices of Australian men. We suggest research which may promote a better understanding of weight-control practices in the Australian population.

Adult↗
PubMed1994

Olfactory function in Parkinson's disease subtypes.

Decreased olfactory function commonly occurs in idiopathic Parkinson's disease (PD), regardless of stage, treatment, or duration of disease. In the present study, we sought to determine whether different subtypes of PD, categorized according to well-defined clinical criteria, evidence different degrees of olfactory dysfunction. Significantly different scores on the University of Pennsylvania Smell Identification Test (UPSIT) were present between patients with benign PD and malignant PD (respective means [SD] = 22.51 [8.50] and 17.38 [6.29]) and between tremor-predominant PD and postural instability-gait disorder (PIGD)-predominant PD (23.43 [8.18] versus 17.35 [6.00]). No statistically significant differences in UPSIT scores were observed between young-onset and older-onset PD patients. Women outperformed men in most subtypes examined.

Adult↗
PubMed1994

The effect of human olfactory biopsy on olfaction: a preliminary report.

Normal human olfactory function is subject to a wide variety of factors. Although biopsy of human olfactory neuroepithelium has been reported by several researchers, there are no studies which have evaluated the effect of this procedure on olfactory function. In this retrospective study, we sought to determine if tissue removal from the olfactory cleft has an adverse influence on the sense of smell. Nineteen subjects underwent bilateral olfactory testing and subsequent endoscopic olfactory mucosal biopsy. All subjects were retested 6 weeks to 1 year after olfactory neuroepithelial biopsy. No statistical difference was found between olfactory tests performed before or after biopsy. These data suggest that biopsy of human olfactory neuroepithelium has no discernible adverse effect on the ability to smell.

Alzheimer Disease↗
PubMed1993

High-dose-rate brachytherapy in primary stage I and II vaginal cancer.

Thirteen patients with primary vaginal cancer were treated with external beam irradiation and high-dose-rate brachytherapy. Median age was 65 years old. Five tumors were stage I, 4 stage IIA, and 4 stage IIB. Twelve tumors were squamous and 11 were moderately or poorly differentiated. Median tumor diameter was 4 cm. Patients were treated with external beam irradiation (4500 cGy) and high-dose-rate brachytherapy (2000-2800 cGy in three to four fractions). All 13 patients had a complete response. Local control was achieved in 12 patients (92%) at a median follow-up of 2.6 years. No acute or chronic intestinal or bladder grade 3 or 4 toxicity was observed. Moderate to severe vaginal stenosis occurred in 6 patients (46%). Treatment of stage I and II primary vaginal cancer with external beam irradiation and high-dose-rate brachytherapy appears to produce a high response rate, local control, and survival with minimal complications.

Adult↗
PubMed1993

Olfactory testing differentiates between progressive supranuclear palsy and idiopathic Parkinson's disease.

Olfactory dysfunction occurs in most patients with idiopathic Parkinson's disease (PD). In this study, we sought to determine whether such dysfunction is also present in progressive supranuclear palsy (PSP), a condition which shares a number of motor symptoms with PD and is commonly misdiagnosed as PD. We administered the University of Pennsylvania Smell Identification Test, a standardized test of odor identification ability, to 21 PSP patients; 17 also received a forced-choice odor detection threshold test. We compared the olfactory test scores to those obtained from PD patients and normal controls matched to the PSP patients on the basis of age, sex, and smoking habits. Overall, the olfactory function of the PSP patients was markedly superior to that of the PD patients and did not differ significantly from that of the normal controls. There was no association in either the PSP or PD patient groups between (1) the olfactory test scores and (2) measures of motor symptom severity, disease stage, and medication usage. These findings demonstrate that patients with PSP and PD differ markedly in their ability to smell and suggest that olfactory testing may be useful in their differential diagnosis.

Aged↗
PubMed1993

Updated care guidelines for patients with automatic implantable cardioverter defibrillators.

Since its clinical introduction, AICD therapy has gained significant acceptance. Some physicians consider it the "gold standard" in treating malignant tachyarrhythmias associated with sudden cardiac death. As the technology and therapy application have grown, nursing responsibilities have evolved as well. And, with the forthcoming combinations of technology such as AICDs with antitachycardia pacing and bradycardia pacing, the sophistication of the therapy is expected to increase. However, the most critical role for nurses in AICD patient care remains education. Increased utilization has made AICD implants more common, but many patients still lack the initial information and acceptance needed for therapeutic success. Health-care professionals who continue to update and share their understanding of this life-saving technology make invaluable contributions to the care of these patients who have received a second chance at life.

Defibrillators, Implantable↗
PubMed1992

Anaesthesia for intraperitoneal hyperthermic perfusion.

Intraperitoneal hyperthermic perfusion is a method of regional chemotherapy shown to be effective in the prevention and treatment of peritoneal metastases. General anaesthesia for a patient who required this procedure is described. Guidelines for management are suggested, with particular emphasis on temperature control, fluid and electrolyte balance and postoperative care.

Acid-Base Equilibrium↗
PubMed1992

Humoral and cell surface interactions during gamma-irradiation leukemogenesis in vitro.

Gamma-irradiation of plateau phase cultures of the clonal murine bone marrow stromal cell line D2XRII followed by cocultivation of a clonal interleukin 3 (IL-3) (granulocyte-macrophage colony-stimulating factor (GM-CSF)-dependent hematopoietic progenitor cell line FDC-P1JL26 results in a significant increase in "cobblestone islands" of attachment and emergence of subclonal factor-independent malignant sublines. Biochemical purification of conditioned medium from irradiated D2XRII cells yielded a 75,000-dalton glycoprotein termed leukemogenic stromal factor (LSF) that was neutralized by a polyclonal antiserum to murine macrophage colony-stimulating factor (M-CSF). A monoclonal antibody to the murine M-CSF receptor (c-fms) neutralized the biological activity of this molecule in a manner comparable to its effect on recombinant human or murine M-CSF. FDC-P1JL26 parent cells were positive for Ly5, MEL-14, mGR, VLA-4, PGP-1 (CD44), and Thy1.2. After culture in LSF, Thy1.2, MEL-14, and mGR became undetectable; however, significant cell surface MAC-1 antigen and c-fms (M-CSF receptor) were expressed. Neither line was positive for Ly6, Ly22, I-CAM-1, or B220 antigen. LSF-precultured FDC-P1JL26 cells transferred as single cells to microwell culture with 5000-cGy-irradiated D2XRII cells revealed a 60-fold increase in frequency of cobblestone island formation and evolution of factor-independent subclones compared to the parent line. Both parent and LSF-precultured cells became factor independent at a 100-fold lower frequency if kept in suspension in LSF in the absence of stromal cells. Antiserum to M-CSF or monoclonal antibody to the murine M-CSF receptor (c-fms) did not inhibit or displace cobblestone island formation by either clone of FDC-P1 on irradiated stromal cells indicating a mechanism of binding not involving the M-CSF receptor. However, anti-serum to the M-CSF receptor inhibited growth of one factor-independent subclone. In separate studies, a subclone of IL-3-dependent 32Dc13 cells, expressing the transfected murine c-fms protooncogene but not the parent 32Dc13 cell line or another subclone expressing the transfected gene for the human M-CSF receptor, showed adherence and became factor independent when cocultivated with irradiated D2XRII stromal cells. Thus, irradiated stromal cells bind M-CSF receptor-positive hematopoietic progenitor cells and induce c-fms-dependent factor-independent tumorigenic subclones. The cellular interactions in this model may be relevant to gamma-irradiation leukemogenesis in vivo.

Animals↗
PubMed1991

A tumor necrosis factor (TNF) receptor-IgG heavy chain chimeric protein as a bivalent antagonist of TNF activity.

Using a multistep polymerase chain reaction method, we have produced a construct in which a cDNA sequence encoding the extracellular domain of the human 55-kD tumor necrosis factor (TNF) receptor is attached to a sequence encoding the Fc portion and hinge region of a mouse IgG1 heavy chain through an oligomer encoding a thrombin-sensitive peptide linker. This construct was placed downstream from a cytomegalovirus promoter sequence, and expressed in Chinese hamster ovary cells. A secreted protein, capable of binding TNF and inactivating it, was produced by the transfected cells. Molecular characterization revealed that this soluble version of the TNF receptor was dimeric. Moreover, the protein could be quantitatively cleaved by treatment with thrombin. However, the monovalent extracellular domain prepared in this way has a greatly reduced TNF inhibitory activity compared with that of the bivalent inhibitor. Perhaps because of its high affinity for TNF, the chimeric protein is far more effective as a TNF inhibitor than are neutralizing monoclonal antibodies. This molecule may prove very useful as a reagent for the antagonism and assay of TNF and lymphotoxin from diverse species in health and disease, and as a means of deciphering the exact mechanism through which TNF interacts with the 55-kD receptor.

Animals↗
PubMed1990

Sociodemographic determinants in Australia of the intake of food and nutrients implicated in cancer aetiology.

In recent years, there has been a growing awareness of the role that diet can play in the promotion, retardation or amelioration of the cancer process. This has led to the development of dietary guidelines for cancer prevention by health authorities in several Western societies. However, there is still limited information about the sociodemographic determinants of intake of foods and nutrients of interest in many of these countries. A study of the dietary intake of a random sample of residents of the State of Victoria in Australia showed that women, those in the older age groups and in the higher occupational ranks, had diets more in line with current recommendations for cancer prevention--the most marked differences being between men and women. However, the sociodemographic differences were relatively small compared with the low rate of overall compliance with the guidelines.

Adolescent↗