A prospective, randomized multicenter study comparing APD and CAPD treatment.

OBJECTIVE: The goals for maintenance dialysis treatment are to improve patient survival, reduce patient morbidity, and improve patient quality of life. This is the first randomized prospective study comparing automated peritoneal dialysis (APD) and continuous ambulatory peritoneal dialysis (CAPD) treatment with respect to quality of life and clinical outcomes in relation to therapy costs. DESIGN: A prospective, randomized multicenter study. SETTING: Three Danish CAPD units. PATIENTS: Thirty-four adequately dialyzed patients with high or high-average peritoneal transport characteristics were included in the study.Twenty-five patients completed the study. INTERVENTIONS: After randomization, 17 patients were allocated to APD treatment and 17 patients to CAPD treatment for a period of 6 months. Medical and biochemical parameters were evaluated at monthly controls in the CAPD units. Quality-of-life parameters were assessed at baseline and after 6 months by the self-administered short-form SF-36 generic health survey questionnaire supplemented with disease- and treatment-specific questions. Therapy costs were compared by evaluating dialysis-related expenses. MAIN OUTCOME MEASURES: Quality-of-life parameters, dialysis-related complications, dialysis-related expenses. RESULTS: The quality-of-life studies showed that significantly more time for work, family, and social activities was available to patients on APD compared to those on CAPD (p < 0.001). Although the difference was not significant, there was a tendency for less physical and emotional discomfort caused by dialysis fluid in the APD group. Sleep problems, on the other hand, tended to be more marked in the APD group. Any positive effect of APD compared to CAPD on dialysis-related hospital days or complication rates could not be confirmed. With larger patient samples, it is possible, however, that a significant difference might have been achieved. The running costs for APD treatment were US $75 per day and for CAPD treatment US $61 per day. CONCLUSION: If APD treatment can help to keep selected patients vocationally or socially active, paying the extra cost seems reasonable.

Peritonitis incidence on a disconnect CAPD-system with or without the use of iodine clamp shields.

The purpose of the study was to review a single center's experience with the disconnect system for continuous ambulatory peritoneal dialysis (CAPD), and to evaluate peritonitis incidence with and without use of iodine-containing clamp shields. The retrospective review of patients using the disconnect system lasted from January 1991 throughout March 1993, evaluating the peritonitis incidence with and without use of iodine clamp shields. In the observation period, a total of 103 patients were evaluated. Of these, 42 patients were treated with iodine clamp shields until July 1992 and then were instructed not to use the iodine clamp shields, thus acting as their own controls. We found an overall peritonitis incidence of 0.411 episodes/patient/year (= 29.2 patient-months/episode) on disconnect CAPD-system (Baxter), in spite of the fact that more than 60% of our dialysis population is treated with peritoneal dialysis. We found no difference in peritonitis rates with or without the use of iodine clamp shields. Peritonitis rates with clamp shields were 0.400 episodes/patient/year and, without clamp shields, were 0.400 episodes/patient/year. The introduction of a disconnect system provided a system with low incidence of peritonitis. No difference in peritonitis rates was observed with or without the use of iodine clamp shields, allowing us to reduce the cost of treatment and to simplify training procedures.

PD-related infections of standard and different disconnect systems.

A review of 332 patients initiating continuous ambulatory peritoneal dialysis (CAPD) treatment from January 1988 throughout September 1993, with a total observation time of 5237 patient-months. Seven peritoneal dialysis (PD) systems were used, three of which were comparable regarding patient characteristics: standard system (Baxter) and two disconnect systems, Twinbag (Baxter) and Gemini (Gambro). The two disconnect systems were identical in principle, except that Twinbag used iodine as disinfectant of connections and Gemini used alcohol as disinfectant. We found a reduction of peritonitis rates in one of the disconnect systems--Twinbag (iodine) 0.42 episodes/patient/year--and a slight increase in another disconnect system--Gemini (alcohol) 1.17 epi/patient/yr--compared to standard system (iodine) 0.92 epi/patient/yr. An improvement of exit-site infections (ESI) and tunnel infections was seen in both disconnect systems (0.17 and 0.20 epi/patient/yr) compared to standard system (0.35 epi/patient/yr). Introduction of disconnect CAPD system reduced peritonitis rates in systems using iodine as disinfectant. Disconnect systems reduced ESI, probably due to less trauma to the catheter. We recommend the use of disconnect CAPD systems using iodine instead of alcohol as disinfectant.

Influence of infusion pump operation and flow rate on hemodynamic stability during epinephrine infusion.

OBJECTIVE: To determine whether variations in the flow rate of epinephrine solutions administered via commonly available infusion pumps lead to significant variations in blood pressure (BP) in vivo. DESIGN: Prospective, randomized, crossover study with factorial design, using infusion pumps with four different operating mechanisms (pulsatile diaphragm, linear piston/syringe, cyclic piston-valve, and linear peristaltic) and three drug delivery rates (1, 5, and 10 mL/hr). SUBJECTS: Two healthy, mixed-breed dogs (12 to 16 kg). INTERVENTIONS: Dogs were made hypotensive with methohexital bolus and continuous infusion. BP was restored to normal with constant-dose epinephrine infusion via two pumps at each rate. MEASUREMENTS: Femoral mean arterial pressure (MAP) was recorded every 10 secs. Pump-flow continuity was quantitated in vitro using a digital gravimetric technique. Variations in MAP and flow continuity were expressed by the coefficient of variation; analysis of variance was used for comparisons. RESULTS: The mean coefficients of variations for MAP varied from 3.8 +/- 3.1% (linear piston/syringe) to 6.1 +/- 6.6% (linear peristaltic), and from 3.4 +/- 2.2% (10 mL/hr) to 7.9 +/- 6.6% (1 mL/hr). The coefficients of variation for in vitro flow continuity ranged from 9 +/- 8% (linear piston-syringe) to 250 +/- 162% (pulsatile diaphragm), and from 35 +/- 44% (10 mL/hr) to 138 +/- 196% (1 mL/hr). Both the type of pump and infusion rate significantly (p < .001) influenced variation in drug delivery rate. The 1 mL/hr infusion rate significantly (p < .01) influenced MAP variation. Cyclic fluctuations in MAP of < or = 30 mm Hg were observed using the pulsatile diaphragm pump at 1 mL/hr. CONCLUSION: Factors inherent in the operating mechanisms of infusion pumps may result in clinically important hemodynamic fluctuations when administering a concentrated short-acting vasoactive medication at slow infusion rates.

Relationship between pain severity and serum beta-endorphin levels in postoperative patients.

STUDY OBJECTIVE: To examine the relationship among postoperative pain severity, serum beta-endorphin level, and serum morphine level in pediatric patients after posterior spinal fusion with instrumentation. DESIGN: A prospective study. SETTING: University-based medical center. PATIENTS: Ten patients age 13-17 years admitted for posterior spinal fusion with instrumentation. INTERVENTIONS: Each subject was administered an initial dose of intravenous morphine 100 micrograms/kg, followed by a constant infusion of 50 micrograms/kg/hour. The primary physician was allowed to titrate the dosage as required to meet the patient's requirement for analgesia. Whole blood was obtained for the analysis of serum morphine and beta-endorphin levels preoperatively, after the initial morphine dose, 24 hours after initiation of the infusion, and before any change in dosage. At each blood sampling time, pain severity ratings were obtained from the subject, nurse, and parent using a 10-point linear scale. MEASUREMENTS AND MAIN RESULTS: No statistical difference between serum beta-endorphin values preoperatively and after the initial dose of morphine was observed; mean values were 68 and 60 pg/ml, respectively. The relationships between serum beta-endorphin level and pain scores were statistically significant only for self (subject) pain scores (p = 0.014, r = 0.30). Mean serum morphine level was 21.9 ng/ml for patients with self pain scores of 4 or less. CONCLUSION: The clinical usefulness of serum beta-endorphin as a measure of pain severity was not established under the experimental conditions of this study.

Cost, resource utilization, and severity of illness in intensive care.

The relationship between health care resource use and severity of illness is important to hospitals providing care to sicker patients, so we investigated the relationship between resource utilization, cost, and severity of illness in 229 consecutive patients admitted to a pediatric intensive care unit. Resources measured included length of stay and number and cost of laboratory and imaging studies. Pediatric intensive care unit and daily mortality risks (assessed by the Physiologic Stability Index and the Dynamic Risk Index) were stratified as very low risk (less than 1%), low risk (1% to 2.5%), moderate risk (2.5% to 5.0%), and high risk (greater than 5%). Increasing daily resource use was directly related to increasing gradations of severity of illness. For very low, low-, moderate-, and high-risk patient days, the daily numbers of diagnostic studies were (mean +/- SEM) 20.1 +/- 0.6, 31.4 +/- 1.1, 37.7 +/- 1.6, and 43.0 +/- 1.8, respectively. Total resource use, including diagnostic tests and length of stay, also increased with pediatric intensive care unit mortality risk. Diagnostic testing and corresponding costs were significantly higher for infants who died in the pediatric intensive care unit than for survivors on a day-by-day basis as well as for the entire stay in the care unit. We conclude that there is a direct, positive relationship between resource use, cost, and gradations of severity of illness that, if accounted for, would result in more equitable health care reimbursement.

Resource use, efficiency, and outcome prediction in pediatric intensive care of trauma patients.

To study the impact of trauma patients on Pediatric Intensive Care Units (PICUs), 164 trauma patients' data from 1,075 consecutive admissions to five PICUs were reviewed. Resource use (Therapeutic Intervention Scoring System [TISS] points) and mortality risks (Physiologic Stability Index [PSI] and Pediatric Risk of Mortality [PRISM] scores) were obtained daily for all patients. Trauma patients constituted 15.2% of all PICU patients, and used 14.9% of patient care days and 14.5% of TISS points. Efficiency of trauma patient care was 75% overall compared to 79% overall for nontrauma patients (p less than 0.001). Trauma patient mortality was 9.8%. Tests for goodness of fit showed the PSI and PRISM scores to be accurate outcome predictors for trauma patients (PSI: chi 2 (4) = 2.852, p greater than 0.50; PRISM: chi 2 (4) = 1.216, p greater than 0.50). Trauma patients are a minority of PICU patients and deaths. Their resource use is proportional to their numbers, although less efficient than for nontrauma patients. PSI and PRISM are accurate mortality risk predictors for trauma patients.