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B Piraino

Publications and source records attributed to B Piraino.

At least 37 records · Page 2Linked to original sources
PubMed1997

Estimating the daily dialysate drain volume required in CAPD for a target peritoneal creatinine clearance by body water and peritoneal transport characteristics.

Stepwise logistic regression performed in 324 clearance studies in 194 patients identified daily drain volume normalized by body water (DV/V) and peritoneal solute transport type as the predictors of peritoneal creatinine clearance (CCrp) in continuous ambulatory peritoneal dialysis (CAPD). Solution of the regression model for DV/V provided DV/V values predicted to provide a desired CCrp at different probabilities. The ability of the predicted DV/V to detect desired CCrp values was tested in a new set of 359 clearance studies in 217 CAPD patients who had a peritoneal equilibration test within 12 months of the clearance study. No patient with low transport had a CCrp exceeding 54 L/1.73 m2 weekly. The following DV/V values detected CCr > or = 54 L/1.73 m2 weekly with a probability of at least 80%: for low-average transport, 0.406 L/L per 24 hours; for high-average transport, 0.339 L/L per 24 hours; for high transport, 0.241 L/L per 24 hours. Corresponding DV/V values for a CCrp of 60 L/1.73 m2 weekly were as follows: for high-average transport, 0.351 L/L per 24 hours; for high transport, 0.271 L/L per 24 hours. For high-average transport, maximal body surface area (BSA) estimates allowing a CCrp of 60 L/1.73 m2 weekly at a CAPD schedule of four daily exchanges with 3-L exchange volume and 1.5 L/24 hour ultrafiltration volume, and with the specified DV/V values were 2.03 m2 in women and 1.77 m2 in men. Corresponding BSA estimates for high peritoneal solute transport were 2.58 m2 in women and 2.21 m2 in men. The delivered dose of CAPD, expressed as DV/V, required to achieve a target CCrp can be calculated from multivariate statistical models taking into account the peritoneal solute transport type. Multiplication of the required DV/V by V provides an estimate of the required daily exchange volume. Maximal BSA estimates allowing a target CCrp can be calculated for each gender and peritoneal solute transport type.

Biological Transport↗
PubMed1996

A randomized trial of Staphylococcus aureus prophylaxis in peritoneal dialysis patients: mupirocin calcium ointment 2% applied to the exit site versus cyclic oral rifampin.

The objective of this study was to compare prophylaxis for Staphylococcus aureus infections in peritoneal dialysis patients using 600 mg cyclic oral rifampin for 5 days every 3 months versus mupirocin calcium ointment 2% applied daily to the exit site. The study design was a prospective randomized trial, controlling for S aureus nasal carriage. Eighty-two continuous ambulatory and continuous cyclic peritoneal dialysis patients (54% male, 71 % white, 34% insulin-dependent, mean prestudy time on peritoneal dialysis 1.2 years) were randomly assigned to cyclic rifampin (n = 41 patients) or daily exit site mupirocin prophylaxis (n = 41 patients). Mean follow-up was 1 year. S aureus catheter infection rates were 0.13/yr with mupirocin and 0.15/yr with rifampin (P = NS). Both rates were significantly lower than the center's historical rate (the period between 1983 and 1992) of 0.46/yr prior to the study (P < 0.001). S aureus peritonitis rates were 0.04/yr with mupirocin and 0.02/yr with rifampin (P = NS), both significantly lower than the center's historical rate of 0.16/yr (P < 0.02). Catheter loss due to S aureus infections was 0.02/yr with mupirocin and 0/yr with rifampin (P = NS), both significantly lower than the center's historical rate of 0.12/yr (P < 0.001). There were no side effects in patients using mupirocin, but 12% were unable to continue rifampin due to side effects. We conclude that mupirocin ointment at the exit site and cyclic oral rifampin are equally effective in reducing S aureus catheter infections. In addition, rifampin or mupirocin significantly reduced S aureus peritonitis and catheter loss due to S aureus infections. Mupirocin at the exit site provides an excellent alternative prophylaxis for S aureus infections, particularly in patients who cannot tolerate oral rifampin therapy.

Administration, Cutaneous↗
PubMed1996

Peritonitis associated with exit site and tunnel infections.

We reviewed all episodes of peritonitis associated with exit site and/or tunnel infection (n = 87; rate, 0.1/yr; 13% of all peritonitis episodes) occurring from 1979 to 1995. The exit site or tunnel infection was diagnosed at the time or shortly after the patient presented with peritonitis in 66% of the episodes. In the other one third the exit site or tunnel infection was diagnosed a median of 40 days prior to the development of peritonitis. Staphylococcus aureus accounted for 52% of episodes. Pseudomonas aeruginosa was the next most common organism. In 63 (72%) of the episodes the catheter was removed to resolve the infection at a median of 8 days (range, 0 to 226 days) from the onset of peritonitis. Catheter removal after 5 days predominately for refractory peritonitis (n = 23; median time to removal, 8 days) or relapsing peritonitis (n = 11; median time to catheter removal, 103 days). Patients with relapsing peritonitis suffered two to four episodes prior to removal of the catheter. Patients with peritonitis associated with tunnel infection were more likely to lose their catheter than patients with peritonitis associated with exit site infection (86% v 58%), while Staphylococcus epidermidis infections were less likely to result in catheter loss compared with all other organisms (15% v 82%). After a protocol to reduce S aureus catheter infections was implemented in 1990, the rate of catheter-related peritonitis decreased from 0.14/yr to 0.05/yr due to a decrease in S aureus episodes. We conclude that peritonitis episodes associated with a tunnel infection infrequently resolve without catheter removal. Delayed catheter removal in such circumstances often results in refractory or relapsing peritonitis. Therefore, catheter removal should be done promptly. Antibiotic prophylaxis for S aureus can reduce catheter-related peritonitis.

Bacterial Infections↗
PubMed1996

Peritoneal catheter exit-site and tunnel infections.

Peritoneal catheter exit-site and tunnel infections may lead to peritonitis and catheter loss. Exit-site infections are diagnosed when there is pericatheter erythema and/or purulent drainage. Staphylococcus aureus is the most common cause of both exit-site and tunnel infections. S. aureus nasal carriage is an important risk factor for S. aureus catheter infections. Few other risk factors for catheter infections have been identified. Treatment of catheter infections consists of antibiotic therapy, often prolonged, as well as intensification of exit-site care. Refractory cases may resolve with revision of the tunnel and exit-site with removal of the superficial cuff, but some patients undergoing this procedure will develop peritonitis. Once peritonitis develops from a tunnel infection, the catheter should be replaced. Research on prevention of catheter infections has focused on three areas: antibiotic prophylaxis, exit-site care, and new catheter designs. Several antibiotic protocols, including intranasal mupirocin, cyclical oral rifampin, and exit-site mupirocin, are effective in decreasing S. aureus catheter infections and should be used more widely. New catheter designs may, in the future, prove to further diminish catheter infection and loss, but there are insufficient data at this time to show superiority of one catheter over another.

Catheters, Indwelling↗
PubMed1996

Peritonitis influences mortality in peritoneal dialysis patients.

Mortality remains high in peritoneal dialysis (PD) patients. Known risk factors for mortality include age, diabetes, race, initial albumin level, and cardiovascular disease. Peritonitis is reported to cause death in 1 to 6% of PD patients but has not been well studied as a risk factor for mortality. This study examined 516 adults with a total of 896 yr on PD at one center to determine if peritonitis influenced mortality. Time at risk began on Day 1 of training and ended at death, transplant, or 60 days after transfer to hemodialysis or intermittent peritoneal dialysis. The overall mortality rate was 17.4/100 patient yr. Survival was lower for whites, men, diabetic patients, and older patients. Independent risk factors for mortality (by Cox proportional hazards) were race, diabetes, increased age, and increased peritonitis rate. Use of the Y-set was not associated with decreased mortality. Peritonitis was a risk factor only in whites, nondiabetic patients, and those patients over the age of 60. For every 0.5/yr increase in the peritonitis rate, the risk of death increased 10% in whites, 11% in those patients who were over the age of 60, and 4% for nondiabetic patients. Mortality rates did not decrease over time (1979 to 1995), although peritonitis rates fell significantly (P < 0.001). Rates of Gram-negative and fungal peritonitis showed no trend over time. Peritonitis contributed to 25 of 158 (15.8%) of deaths. Gram-negative/fungal peritonitis accounted for 14 deaths (9.5% of all Gram-negative/fungal episodes) whereas Staphylococcus epidermidis accounted for only 1 death (0.5% of all S. epidermidis episodes) (P < 0.001). Cardiovascular disease was more common in those patients whose deaths were unrelated to peritonitis (P < 0.01), whereas an infectious cause was more common in those patients whose deaths were peritonitis-related (P < 0.001). In this study, peritonitis was a risk factor for death in whites, nondiabetic patients, and older patients. However, the Y-set did not improve survival, perhaps because it does not decrease Gram-negative/fungal peritonitis. To have an impact on survival, efforts are needed to reduce the peritonitis that results from these more serious pathogens.

Adult↗
PubMed1996

Exit-site care.

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Bacterial Infections↗
PubMed1996

Recommendations for dietary protein intake in CAPD patients.

Protein malnutrition occurs in 41%-42% of peritoneal dialysis (PD) patients, indicating that the current intake of protein is inadequate in many patients. With an intake of protein > or = 1 g/kg/day, most continuous ambulatory peritoneal dialysis (CAPD) patients are in positive or neutral nitrogen balance, while with an intake below this there is considerable risk of negative nitrogen balance. Most CAPD patients are prescribed a diet containing 1.2 g/kg/ day protein or higher, yet the majority of patients have an intake lower than this. Several factors are associated with inadequate protein intake including older age, comorbidity, and loss of residual renal function when the dialysis regimen is inadequate. A minimum weekly Kt/V of 2.0 is needed to achieve a protein intake of 0.9-1.0 g/kg/day. Patients with peritonitis and a permeable membrane have increased losses of protein via the dialysate, and so are at risk for protein malnutrition. To prevent and treat protein malnutrition, routine assessment of both nutritional status and dialysis adequacy are needed. Patients with an adequate clearance (weekly Kt/V of 2.0 or higher, creatinine clearance of 60 L/week/1.73 m2), who are eating 1 g/kg/day and have no markers of malnutrition, including a normal serum albumin, require no intervention. Protein supplements can be prescribed to increase the protein ingestion to 1.2 g/kg/day or more, if the serum albumin is low, or if the patient is clinically malnourished with weight loss and decreased muscle mass. Gastro-paresis and esophagitis, common in PD patients, can be treated. If supplements, dietary counseling, and adequate dialysis regimen do not result in improvement of nutritional status, amino acid dialysate may be beneficial. One to two exchanges per day using amino acid dialysate converts the nitrogen balance from neutral to positive in malnourished CAPD patients. To use amino acid dialysate successfully, the physician must be sure that the clearance is adequate as the serum urea nitrogen rises; inadequate dialysis can result in uremia and decreased intake.

Adult↗
PubMed1995

Research directions in peritoneal dialysis infections.

There are many promising areas of research on peritoneal dialysis related infections. Improvements in connection technology, especially the Y set and CCPD, have led to a decrease in the rate of peritonitis due to Staphylococcus epidermidis. The search to find a more biocompatible dialysate that is less immunocompromising is underway; clinical trials examining peritonitis rates with these new formulations remain to be performed. Considerable progress has been made in elucidating peritonitis related to catheter infection, especially that due to Staphylococcus aureus. Nasal carriage has been identified as a risk factor for subsequent infections. Several prophylactic antibiotic approaches including rifampin, trimethoprim/sulfamethoxazole and mupirocin have shown promise in reducing these infections. Innovative catheter designs that decrease the risk of bacterial colonization are another investigative approach. The timing of both catheter removal and replacement for infection is controversial and requires further study. Lastly, much remains to be learned about peritonitis from an enteric source.

Anti-Bacterial Agents↗
PubMed1995

Effect of increasing exchange volume or frequency on CAPD efficiency.

We evaluated the effect of increasing the volume of all exchanges (group A), increasing exchange frequency (group B), or increasing nocturnal exchange volume alone (group C) on dialysis urea and creatinine clearances (DUrCl and DCrCl, respectively) and on KT/V in 20 continuous ambulatory peritoneal dialysis (CAPD) patients (25 maneuvers in 20 patients). The average duration of the maneuver was 4.5 +/- 2.1 months. In group A, a significant increase occurred in DCrCl and DUrCl. Residual renal function (RRF) decreased by an average of 0.5 mL/min (not significant, NS). In group B, DUrCl increased by 19% (NS). RRF decreased significantly from 2.5 +/- 1.0 mL/min to 1.0 +/- 0.6 mL/min. In group C no changes were noted in dialysate clearances or RRF. In all groups KT/V was maintained regardless of the maneuver employed and despite the changes in dialysis clearance observed in groups A and B. This stability is probably related to the significant decline in RRF for the group as a whole during the observation period. KT/V can be maintained as RRF declines with either increases in dialysate volume or exchange frequency. However, efforts to increase KT/V to higher mandated values will probably require changes in both dialysate volume and frequency.

Creatinine↗
PubMed1994

Infecting organisms in continuous ambulatory peritoneal dialysis patients on the Y-set.

Disconnect systems for performing continuous ambulatory peritoneal dialysis (CAPD) use a flush-before-fill technique that should theoretically reduce the peritonitis caused by touch contamination. However, little information about the infecting organisms in CAPD-related infections using disconnect systems is available. We performed a retrospective matched-case controlled study to define the organisms responsible for the peritonitis and catheter infections seen in CAPD patients using the Y-set without disinfectant. One hundred nineteen patients who began CAPD on the Y-set were matched with 119 patients who began CAPD on the standard spike system. Patients were matched for age, sex, race, insulin dependence, and time on CAPD. Infection data were prospectively collected for all patients. Peritonitis, exit site, and tunnel infection rates (expressed as number of episodes per patient-year) were all significantly lower in the Y-set patients (0.56 v 0.94, 0.68 v 1.08, and 0.14 v 0.22, respectively). The lower peritonitis rate in the Y-set patients compared with that found in the standard spike system patients was due to a reduction in Staphylococcus epidermidis (0.17 v 0.26, P = 0.02), polymicrobial (0.014 v 0.06, P = 0.01), other gram-positive (0.007 v 0.09, P = 0.001), and sterile (0.10 v 0.19, P = 0.008) peritonitis. Rates of Staphylococcus aureus and gram-negative peritonitis were not different among the two groups. S epidermidis (0.12 v 0.23, P = 0.0014) and gram-negative (0.12 v 0.18, P = 0.04) exit site infection rates were also lower in the Y-set patients.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1994

Managing Staphylococcus aureus catheter infection in continuous ambulatory peritoneal dialysis patients.

A case of Staphylococcus aureus catheter infection in a patient on peritoneal dialysis is presented and discussed by nephrologists, a social worker, a nurse specializing in the care of peritoneal dialysis patients, and the patient involved. The focus of the multidisciplinary case discussion concerns the management of S aureus catheter infections, including catheter removal, psychosocial issues and the patient's response to the need for catheter removal, the risk factors and prevention of S aureus catheter infections in peritoneal dialysis patients, and exit site care practices.

Adult↗
PubMed1994

A comparison of clearances on tidal peritoneal dialysis and intermittent peritoneal dialysis.

OBJECTIVES: To compare the small molecule clearances on tidal peritoneal dialysis (TPD) and intermittent peritoneal dialysis (IPD), controlling for dialysate flow rate. DESIGN: Alternating 8-hour treatments on IPD and TPD (2 of each in 6 patients), each treatment separated by 3 or more days [patients returning to continuous ambulatory peritoneal dialysis (CAPD) in the interim] were performed. IPD treatments consisted of 15 exchanges with 2 L/exchange for a total of 30 L/treatment. TPD treatments consisted of 29 exchanges, with an initial fill volume of 2 L, followed by 1 L tidal volume for the subsequent exchanges (reserve volume of 1 L) for a total of 30 L/treatment. PATIENTS: Six patients, with a mean dialysate/plasma (D/P) creatinine as determined by the peritoneal equilibration test (PET) of 0.64 +/- 0.10, were studied. Four had a low-average D/P creatinine, while 2 had a high-average D/P creatinine. MEASUREMENTS: Urea nitrogen, creatinine, phosphate, and potassium clearances on TPD and IPD were compared using the paired t-test. RESULTS: The dialysate flow rates were 3.7 +/- 0.1 L/hour for IPD and 3.8 +/- 0.2 L/hour for TPD. The mean dialysate dextrose was 1.9 +/- 0.5 g/dL for both. The creatinine clearances were 9 +/- 2 versus 10 +/- 3 mL/minute, the urea nitrogen clearances 19 +/- 3 versus 20 +/- 3 mL/minute, and phosphate clearances 10 +/- 3 versus 11 +/- 3 mL/minute for IPD and TPD, respectively (all not different). The ultrafiltration rates were 2.9 +/- 0.9 mL/minute on IPD and 3.3 +/- 1.6 mL/minute on TPD (not different). On both IPD and TPD the clearances of urea nitrogen, creatinine, and phosphate for the 2 patients with high-average D/P creatinine were higher than for the 4 patients with low-average D/P creatinine. CONCLUSIONS: When the dialysate flow rate is controlled and a TPD prescription of 1 L reserve and tidal volumes is used, the small molecule clearances on IPD are similar to those on TPD.

Blood Urea Nitrogen↗
PubMed1994

Careful patient selection and dialysis prescription are required for effective nightly intermittent peritoneal dialysis.

OBJECTIVE: To evaluate the adequacy of dialysis in patients on nighttime intermittent peritoneal dialysis (NIPD). DESIGN: Retrospective review of prospectively collected data. PATIENTS: Seven patients on NIPD. MEASUREMENTS: The fast peritoneal equilibration test (PET) was used to determine peritoneal membrane permeability for small solutes. Adequacy of dialysis measured by 24-hour collections of dialysate and urine for weekly KT/V and creatinine clearance in liters/week/1.73 m2 was assessed in patients with (n = 3) and without (n = 4) residual renal function and evaluated in concert with the patient's clinical status. Outcome for each patient was also noted. RESULTS: Five of the patients had a high-average dialysate/serum creatinine by PET ( > 0.66). Despite a weekly KT/V of 1.7 or more, four of the seven patients on NIPD were uremic and either transferred to hemodialysis or continuous cycling peritoneal dialysis (CCPD). A fifth patient had a KT/V of 1.4 and was also uremic on NIPD. The patient who was clinically well and continued on NIPD had significant residual renal function. CONCLUSIONS: NIPD should be restricted to patients with high-average dialysate/serum creatinine as determined by PET and residual renal function or those with high dialysate/serum creatinine. Extended dialysis time and large volumes of dialysate are required for successful NIPD in patients without residual renal function. Accepted parameters of dialysis adequacy used for patients on continuous peritoneal dialysis are not appropriate for intermittent forms of peritoneal dialysis.

Creatinine↗
PubMed1994

A comparison of infection rates among older and younger patients on continuous peritoneal dialysis.

OBJECTIVE: To determine if peritoneal dialysis-related infection rates are higher in older patients compared with younger patients. DESIGN: A retrospective review of prospectively collected data. Control adult patients were matched with older study patients for race, sex, insulin dependence, connection device, and time on dialysis. SETTING: A university-based peritoneal dialysis program which includes patients from a Veterans Administration Hospital outpatient dialysis program. PATIENTS: Infection rates of 103 patients 60 years of age (older patients) were compared with 103 matched control patients 18-49 years of age (younger patients). MAIN OUTCOME MEASURES: Rates of peritonitis, exit site and tunnel infection expressed as episodes/patient/year (episodes/year) and the infecting organisms for each were examined. Outcomes, including catheter removal and the cause for removal, transfer to another dialysis modality and the reason for such, death and transplantation were also assessed. RESULTS: Mean time on peritoneal dialysis was the same in each group (20 +/- 21 months in the older and 18 +/- 17 months in the younger patients). The overall peritonitis rates were the same in the two groups (0.95/year in the older and 0.89/year in the younger patients), but the older patients had a higher rate of S. epidermidis peritonitis (0.28/year vs 0.13/year, p = 0.0001). S. aureus peritonitis rates were similar (0.16/year in older and 0.17/year in younger patients). Older patients had fewer exit-site infections (0.80/year versus 1.2/year, p = 0.0001) and, specifically, lower rates of S. aureus exit-site infections (0.23/year vs 0.47/year, p = 0.0001). Tunnel infections were also less common in older patients (0.15/year vs 0.23/year, p = 0.008), but S. aureus tunnel infection rates were similar (0.05/year and 0.09/year). Catheter infection was the most common reason for catheter removal in both patient groups (35% of catheters in the older and 44% of catheters in the younger patients, p = NS). More catheters were removed form older patients because of dementia or the loss of mechanical skills required to perform peritoneal dialysis exchanges (15% vs 5%, p = 0.04). CONCLUSIONS: Older age per se is not associated with higher peritonitis rates, but the use of disconnect systems should be encouraged in older patients and their mental and physical skills monitored to avoid S. epidermidis peritonitis. The lower rates of S. aureus catheter infection in older patients requires further study.

Adolescent↗
PubMed1993

Loss of residual renal function in patients on peritoneal dialysis.

We performed a retrospective chart review of 32 patients on peritoneal dialysis (PD) for longer than 5 months (range 5-64 months) in an attempt to identify risk factors influencing the preservation of renal function. Residual renal function (RRF) was evaluated by measurement of creatinine clearance (Ccr) from 24-hour urine collections. Risk factors examined included age and Ccr at start of PD, presence of diabetes, mean arterial pressure (MAP), diastolic blood pressure (DBP), and peritonitis rate. Multiple regression analysis was performed to determine the correlation of these factors to the rate of decline of Ccr. Loss of RRF in all patients was 0.3 mL/min/month (median 0.2, range 0.04-1.7). The contribution of RRF to total Ccr was 39% (range 12%-72.5%). Patient age, presence of diabetes, MAP, DBP, peritonitis rate, and Ccr at the start of PD had no influence on the rate of RRF loss. Nine patients in the study (28%) had been on PD longer than 2 years and still had significant renal function (mean Ccr 3.3 mL/min), which was 40% of their total weekly Ccr. These results show that PD patients can maintain RRF for extended periods and that RRF contributes substantially to their weekly Ccr. The risk factors evaluated did not influence the rate of renal function loss.

Adult↗