Linda Uttley

Limitations of Kinetic Models as Predictors of Nutritional and Dialysis Adequacy in Continuous Ambulatory Peritoneal Dialysis Patients

Nutrition has been shown to predict clinical outcome in continuous ambulatory peritoneal dialysis (CAPD) patients. However, despite the positive relationship between KT/V (urea) and the normalised protein catabolic rate, the ability of urea kinetic modelling to predict clinical outcome or nutrition remains inconclusive. We have evaluated the relationship between nutrition and achieved dialysis in a cross-sectional study of 147 stable CAPD patients on dialysis for a mean period of 22 months. Protein-energy malnutrition was present in 22-32% of the study population. 39 and 41% of the population failed to achieve suggested adequacy targets of 50 liters/week for total creatinine clearance and a weekly KT/V (urea) of 1.7, respectively. Severely malnourished patients had significantly greater normalised clearance and adequacy values than well-nourished patients. Intrinsic actual peritoneal clearance bore no relation to patient size. The subsequent normalisation of this value by a component of patient mass results in a mathematical bias against well-nourished or obese patients. This may explain the failure of such adequacy values to reflect outcome and argues against accepting such values as measures of dialysis well-being.

Quality of Life in CAPD, Transplant, and Chronic Renal Failure Patients with Diabetes

Although quality of life (QoL) is an important outcome measure, there are few studies of QoL in diabetic patients. We performed a cross-sectional study to assess QoL in such patients comparable for age, sex, and co-morbidity. Patients. Group CAPD: DM (n = 19, 12 males), diabetic CAPD patients; group CAPD: no DM (n = 26, 15 males) CAPD patients without diabetes; group TXP (n = 20, 10 males), diabetic transplant patients; and group CKD: DM (n = 20, 11 males), diabetics with chronic kidney disease. Two valid QoL instruments were used: a generic one (SF-36) and one that is disease-specific (RQLP). Results. As a whole, CAPD patients scored badly as far as concerned the physical domain, but with a good mental adaptation. Diabetic CAPD patients exhibited worse QoL for physical functioning, energy, vitality, leisure activity, and eating/drinking limitations. Diabetic transplant patients exhibited the best QoL. The RQLP instrument had better discriminative power for domains such as eating/drinking, treatment effects, and psychosocial aspects. Using analysis of co-variance and adjusting for age, sex, and co-morbidity, QoL differences disappeared. In conclusion, diabetic CAPD patients exhibited the worst QoL though with a satisfactory mental adaptation, a renal-specific instrument had better discriminative power, and the prevention of co-morbidity is likely to improve QoL in such patients.

Home CAPD Nurse—An Asset to a CAPD Program

In the Manchester region the home care nurse provided a valuable service for the patients by maintaining the vital link between home and hospital and achieving a significant reduction in the number of hospital visits. Her role made the out patient treatment of peritonitis more practicable and furnished immediate and close contact during times of difficulty for the patient. Her unique position allows insight into the patient’s family and social situation, giving the ability to envisage and resolve problems sooner than a hospital based team would be able. Patient reaction consistently indicated, particularly from the more vulnerable patients, that the provision of a home nurse was a welcome facility. We feel that the home CAPD nurse is an invaluable member of the CAPD team in any CAPD program but more so in a large one undertaking care of all types of patients but in particular those deemed high risk.