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Biomedical subjects

A P Disney

Publications and source records attributed to A P Disney.

At least 19 recordsLinked to original sources
PubMed2000

Distribution of primary renal diseases leading to end-stage renal failure in the United States, Europe, and Australia/New Zealand: results from an international comparative study.

This report notes the differences in the classification of the primary renal disease (PRD) used in different renal dialysis and transplant registries worldwide. The heterogeneity of coding systems complicates the comparative analysis of end-stage renal disease from different regions. Using data collected over two decades in the United States, Europe, and Australia/New Zealand, we present a method for reorganization of the classes of PRD that allows a straightforward comparison of retrospective data from these registries.

Adult↗
PubMed2000

Shoulder appearances at MR imaging in long-term dialysis recipients.

PURPOSE: To examine shoulder appearances at magnetic resonance (MR) imaging in long-term dialysis recipients. MATERIALS AND METHODS: Twenty-two chronic dialysis recipients underwent 1.0-T MR imaging with a combination of T1-, T2-, and T2*-weighted sequences. Rotator cuff tendon thickening was graded as present or absent by a musculoskeletal radiologist, who also measured the supraspinatus and subscapularis tendon thicknesses with electronic calipers. The long-axis dimension and location of focal osseous lesions, in addition to their T1, T2, and T2* signal intensities, were noted. RESULTS: Supraspinatus (n = 9) and subscapularis (n = 10) tendon thickening was frequently observed. Six (27%) of the 22 patients had combined thickening of the supraspinatus and subscapularis tendons without substantial involvement of the infraspinatus or teres minor tendons. These patients had undergone dialysis longer (median, 19.2 years; range, 16.3-22.8 years) than had the other patients (median, 11.7 years; range, 5.8-19.3 years; P: =.004). The 29 intraosseous lesions had high, intermediate, and low T2 signal intensity in six (21%), nine (31%), and 14 (48%) instances, respectively. CONCLUSION: Supraspinatus and/or subscapularis tendon thickening is common in chronic dialysis recipients. Bone lesions in such patients are of variable T2 signal intensity and usually subchondral or adjacent to the greater tuberosity.

Adult↗
PubMed1999

Cancer in patients on dialysis for end-stage renal disease: an international collaborative study.

BACKGROUND: Previous studies have suggested that the frequency of cancer is higher in patients with end-stage renal disease (ESRD) than in the general population, but have not established whether this increase is confined to certain cancers or to certain categories of ESRD patients. The aim of this study was to examine the risk of cancer in a large cohort of patients treated by dialysis but not transplantation. METHODS: We assembled a cohort of 831,804 patients who received dialysis during the period 1980-94 for ESRD in the USA, Europe, Australia, or New Zealand. We compared the observed frequency of cancer among these patients during 2,045,035 person-years of follow-up with the frequency of cancer in the respective background populations. FINDINGS: During average follow-up of 2.5 years, 25,044 (3%) of 831,804 patients developed cancer compared with an expected number of 21,185 (standardised incidence ratio 1.18 [95% CI 1.17-1.20]). We observed a higher risk of cancer in patients younger than 35 years (3.68 [3.39-3.99]), and the risk gradually decreased with increasing age. High risks were observed for cancer of the kidney (3.60 [3.45-3.76]), bladder (1.50 [1.42-1.57]), and thyroid and other endocrine organs (2.28 [2.03-2.54]). Excess cancers appeared in several organs for which viruses have been suspected as causative agents, whereas cancers of the lung, colorectum, prostate, breast, and stomach were not consistently increased. INTERPRETATION: The overall risk of cancer is increased in patients with ESRD, and the distribution of tumour types resembles the pattern seen after transplantation (although we have no data to make the comparison with skin cancer). The excess risk can largely be ascribed to effects of underlying renal or urinary-tract disease, or of loss of renal function, on the kidney and bladder, and to increased susceptibility to viral carcinogenesis. The relative risk, which is especially high in younger patients, gradually diminishes with age.

Adolescent↗
PubMed1998

Cutaneous necrosis from calcific uremic arteriolopathy.

Calcific uremic arteriolopathy (calciphylaxis) is an uncommon complication of chronic renal failure that is associated with high morbidity and mortality. We report 16 patients (13 female) who presented between 1985 and 1996. All patients developed painful livido reticularis that progressed to cutaneous necrosis and ulceration (11 cases on the proximal extremities and five cases on the distal extremities). Two patients with predominately distal leg disease survived; the cause of death in the other 14 patients was sepsis (six patients), withdrawal from dialysis (three), cardiac arrest (three), and gastrointestinal hemorrhage (two). Mesenteric ischemia from intestinal vascular calcification occurred in two cases. Clinical factors identified included the use of warfarin therapy in seven cases and significant weight loss (>10% body weight) in seven cases in the 6 months preceding the development of calcific uremic arteriolopathy. Skin pathology was studied in 12 cases, with all showing calcific panniculitis and small vessel calcification. Electron microscopic spectral analysis of the mineral content of the calcific lesions in the subcutaneous tissue showed only calcium and phosphorous. In two cases, substitution of low molecular weight heparin for warfarin therapy resulted in clinical improvement. Current theories of pathogenesis and treatment are reviewed. This study confirms the high morbidity and mortality of calcific uremic arteriolopathy producing ischemic tissue necrosis while drawing attention to significant weight loss and warfarin therapy as risk factors for the development of ischemic tissue necrosis. Hyperbaric oxygen therapy warrants further study.

Adult↗
PubMed1998

Some trends in chronic renal replacement therapy in Australia and New Zealand, 1997.

The incident and prevalent rate of renal failure treatment shows a trend towards an older patient population, with more diabetics and non-Caucasoid patients. A concurrent increase in comorbid risk factors (mainly vascular) has influenced outcome results. Comparison of outcome should include allowance for the patient mix, and the trend to a trial of dialysis. Most patients have been dialysed at home or at free-standing (satellite centres). The dialysis prescription for haemodialysis has shown a trend to faster blood flow, longer hours, and more 'biocompatible' cellulose membranes. Most peritoneal dialysis has disconnection systems, and increasing daily volume of dialysate.

Australia↗
PubMed1997

Clinical applications of renal telemedicine.

In 1994, a telemedicine network was established linking the renal unit at The Queen Elizabeth Hospital to three satellite dialysis centres in South Australia. In the first two and a half years of operation, the telemedicine equipment was used on over 6000 occasions. Interviews were conducted with 18 medical, nursing and allied health staff and dialysis patients. The main finding was that the full range of staff, from surgeons and nephrologists to allied health staff and nurses, were able use the technology successfully for clinical purposes. A second finding was that the technology enabled staff to perform a wide range of clinical procedures, from routine outpatient consultations and monitoring infections to making decisions about retrieval or confirming decisions to operate. A third finding was that telemedicine enabled the renal unit to provide improved services in which teams of staff at the different sites cooperated in ways that were not possible before the telemedicine links became available.

Attitude of Health Personnel↗
PubMed1996

User adoption issues in renal telemedicine.

We carried out a longitudinal survey to evaluate the users' attitudes to the introduction of telemedicine into the dialysis units of a renal ward in South Australia. The first questionnaire was distributed to all members of staff involved with the introduction of the system. There were 44 responses (80%). Staff were fairly positive about the telemedicine system, and felt that it was easy to use and reliable. They also clearly felt that the confidentiality and privacy offered by the system in an open ward were unsatisfactory. A second questionnaire was distributed to all staff about six months later and there were 40 responses (66%). Of these, 22 could be matched with the responses from the first survey (a response rate of 50% from the first sample). There were no significant differences in the staff members' feelings between the two surveys, except in two cases: there were significant changes in staff opinion about the degree of confidentiality (P < 0.05) and privacy (P < 0.01) offered by the system, with attitudes becoming more positive in each case. The results indicate the need for dialogue with users, in order to address their concerns regarding the system and practical difficulties. This study highlights the importance of planning, effort, cooperation and an appropriate culture within a renal unit in order for telemedicine to be accepted.

Attitude to Health↗
PubMed1995

Demography and survival of patients receiving treatment for chronic renal failure in Australia and New Zealand: report on dialysis and renal transplantation treatment from the Australia and New Zealand Dialysis and Transplant Registry.

There were 7,059 (403 per million) Australian patients and 1,341 (388 per million) New Zealand patients receiving renal replacement treatment at the end of 1992. Fifty-three percent and 50%, respectively, were dependent on a functioning transplant, 87% and 80%, respectively, from a cadaver donor. In Australia the majority of dialysis patients depended on hemodialysis (68%) and continuous ambulatory peritoneal dialysis (CAPD) (31%); 68% of patients were dialysing at home or in a satellite (free-standing) facility. The majority (62%) of home dialysis patients used CAPD treatment. In New Zealand there were 44% of patients on hemodialysis; 83% dialyzed at home and the majority (65%) used CAPD treatment. Few dialysis units (five of 71) in Australia were "for-profit" facilities; there was none in New Zealand. Universal health care has been available for renal replacement treatment for 20 years. The annual incidence of new patients increased steadily during the past 10 years, to 61 per million (Australia) and 69 per million (New Zealand) in 1992. There were disproportionate numbers of indigenous Australian Aboriginals (51%), New Zealand Maoris (30%), and Polynesian Pacific Islanders (11%) compared with their distribution in the general population. There was a considerable increase in elderly and diabetic patients during the period from 1983 to 1992: in Australia, 25% of patients were over 65 years of age and 14% of patients were diabetic, and in New Zealand, 16% of patients were over 65 years of age and 25% of patients were diabetic. The renal transplantation rate has remained unchanged since 1983 at 27 per million in Australia, but has increased markedly from 20 to 33 per million in New Zealand. The annual transplantation rate was 20% to 30% of those patients aged 15 to 64 years who were likely to be transplanted. The multifactorial analysis of risk factors for survival of dialysis patients showed age, male gender, CAPD treatment, Aboriginal race, and diabetic or analgesic nephropathy to be associated with lower rates of survival. Deaths were commonly due to a cardiac cause (43%), mostly myocardial infarction, or to infection (17%) or withdrawal from treatment (14%). The overall death rate was 12% of patients at risk in 1992. Multifactorial analysis of risk factors for graft survival in transplanted patients showed patient age, diabetic nephropathy, donor age, single-drug regimen, and low transplant activity (operations) at a center to be associated with lower rates of survival.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗
PubMed1994

Renal graft thrombosis. A survey of 134 consecutive cases.

Despite overall improved graft survival, renal graft thrombosis (RGT) remains an important cause of graft loss. Of 6153 consecutive renal transplants (RTx), 134 index cases of graft loss from RGT were reported to the Australian and New Zealand Dialysis and Transplant Registry between 1980 and 1992. Two groups were selected for comparison: (1) institutional controls (n = 127), the previous RTx at the same institution as each index case; and (2) graft controls (n = 107), the contralateral cadaveric donor kidney of each index case. RGT cases that coincidentally occurred in control groups were deleted from those groups (6 of institutional controls, 2 of graft controls). RGT within the first 30 days after RTx occurred in 1.9% of all RTx and was constant from 1980 to 1992. In contrast, RGT caused an increasing proportion of early (within 30 days of RTx) graft losses (P = 0.01). The cumulative occurrence of RGT in those who thrombose was 62.6%, 83.7%, 90.2%, and 93.5% at 2, 7, 14, and 30 days after RTx, respectively. By comparison, with the control groups, no association with RGT was demonstrated for recipient age or sex, primary renal disease, type of dialysis, treatment with CsA, degree of HLA mismatch, panel reactive antibody levels, perfusion solution and perfusion technique, or immunosuppressive therapy. There was a significantly increased incidence of RGT with both extremes of donor age, female donors, and prolonged total ischemic time.

Adolescent↗
PubMed1994

Trends in the incidence of end-stage renal failure due to hypertension and vascular disease in Australia, 1972-1991.

BACKGROUND: Despite the known protective effects upon renal function of lowering blood pressure in primary chronic renal disease, diabetes and malignant hypertension, the number of patients entering dialysis and transplantation programmes with renal failure due to hypertension or vascular disease remains high. AIMS: To analyse the trends in incidence of arteriopathic end-stage renal failure. METHODS: Calculation of mean annual age- and sex-specific rates (by decade) and truncated age-standardised rates for entry into Australian end-stage renal failure programmes in the period 1972-1991. Statistical analysis by chi-squared test, assuming a Poisson distribution of cases. RESULTS: End-stage renal failure attributed primarily to hypertension or vascular disease fell to less than half its former level over the period of observation in persons aged 15-54 years. This change has occurred only in the diagnostic category 'malignant hypertension'. Trends in persons aged 55 years and over are more difficult to analyse because of changing criteria for entry into renal failure programmes, but there has been no indication of any fall in incidence. CONCLUSIONS: The aetiology and pathology of arteriopathic renal failure is diverse, with different patterns in young and old adults. The formerly common pathology in young adults is largely preventable by modern antihypertensive therapy, while arteriopathic renal disease in older persons is not.

Adolescent↗
PubMed1994

The prognosis for end-stage renal failure in spinal cord injury and spina bifida--Australia and New Zealand, 1970-1991.

BACKGROUND: The outcome of patients with end-stage renal failure (ESRF) and spinal cord injury or disease has not been clearly documented. AIMS: The aim of this study was to define the prognosis and social consequences for patients with spinal cord injury or spina bifida (SB) treated for ESRF in Australia and New Zealand from 1970 to 1991. METHODS: Fifty patients (two groups: 25--spinal cord injury, 25--SB) were identified retrospectively by questionnaire to individual renal units. Additional information was obtained from the Australia and New Zealand Dialysis and Transplant Registry. Dialysis and transplant history, degree of disability and cumulative survival with integrated treatment were compared between the two groups. RESULTS: Haemodialysis was the most common form of treatment (75.8% of total treatment time in the spinal cord injury group and 66.1% in the SB group). Home or self-care dialysis for a period of more than six months was achieved in 68% of patients in each group. Ten year cumulative survival with integrated treatment was statistically better in the SB group (p < 0.01). In the 42% of all patients who underwent renal transplantation cumulative patient survival was 94% at one year and 82% at five years, with allograft survival being 73% and 70% respectively. In conclusion ESRF and spinal cord injury or SB has a good prognosis in the longer term with an integrated approach to treatment.

Adult↗
PubMed1994

Trends in incidence of end-stage renal failure in Australia, 1972-1991.

Age-specific and cumulative incidence rates were calculated for entry into Australian end-stage renal failure programmes from 1972 to 1991, as a result of all causes, or from analgesic nephropathy, glomerulonephritis, hypertension and vascular disease, or diabetes. Three different trends were demonstrated. A rising recorded incidence of renal failure occurred throughout the period of observation in those aged 0-4 years (all causes) and in those aged 55 years and over (all categories, least in analgesic nephropathy) principally attributable to a falling fraction of patients not accepted for treatment. Falling incidence rates indicating a real reduction in the burden of disease were seen for analgesic nephropathy (at least up to the age of 64 years) and hypertension and vascular disease (only up to the age of 54 years). In young adults the unchanging incidence of renal failure due to all causes, glomerulonephritis and diabetes probably reflect nearly complete acceptance rates into end-stage renal failure programmes, and therefore approximate the true burden of disease. In end-stage renal failure, age-specific or age-standardized cumulative rates are required to distinguish rising or falling incidence of disease from trends due to changing medical practice.

Adolescent↗
PubMed1994

The risk of ano-genital malignancies in dialysis and transplant patients.

The incidence of anogenital malignancies is greatly increased in patients who have received a renal transplant, but this has not been well studied in patients receiving maintenance dialysis. Our aim was to assess the incidence of these malignancies in patients on dialysis and compare these to transplanted patients. The age standardized incidence ratio (SIR) for anogenital malignancies was calculated by comparing the observed number of malignancies to the expected number. The expected number was calculated by multiplying the age specific incidence rates for each malignancy by the person years at risk in 5-year age cohorts. Of 15,820 patients in the Australia and New Zealand data base, 8,215 had received a renal transplant. A total of 39,750 person years at risk were contributed by patients who had received a renal transplant, while 29,276 person years at risk were contributed by dialysis patients who had not received a renal transplant. For dialysis patients, vulval cancer occurred more commonly than expected (2 observed, 0.48 expected) giving a SIR of 4.2 (95% confidence interval = 0.4-11.9). Cervical cancer occurred less commonly with a SIR of 0.74 (95% Cl = 0.07-2.11). No cases of either anal or penile cancer occurred although these are rare tumors, with only 0.13 and 0.23 cases expected respectively. In transplant recipients 44 anogenital malignancies occurred while 4.3 could have been expected. The SIR ranged from 3.3 (95% Cl 1.7-5.8) for cervical cancer to 55.8 (95% Cl 35.8-83.0) for vulval cancer. To investigate the possible effect of chronic uremia before dialysis began, SIR was calculated to include an additional 24 months of observation before dialysis.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1993

Parathyroidectomy in the treatment of patients with chronic renal failure: a 10-year review.

The technique and outcome of surgery for the manifestations of secondary hyperparathyroidism are described. Forty-seven patients were analysed retrospectively over a 10-year period. Total parathyroidectomy and autotransplantation to the forearm was performed in all but five patients. Improvement occurred in 87 per cent of patients and there were no graft failures. Of six deaths, none was related to surgery. Four patients had recurrent hyperparathyroidism, three being graft dependent and one requiring re-exploration of the neck. Total parathyroidectomy and autotransplantation is a safe and effective approach. The major management problem was graft hyperplasia, seen in three of the 47 patients and managed by simple excision.

Adolescent↗
PubMed1993

Paecilomyces variotii in peritoneal dialysate.

Four cases of peritonitis caused by the filamentous fungus Paecilomyces variotii in patients on continuous ambulatory peritoneal dialysis are reported. Removal of the Tenckhoff catheter and antifungal chemotherapy led to resolution of symptoms in all cases. Possible contaminating events are discussed, and reported infections with P. variotii are reviewed.

Adult↗