Infecciones asociadas a diálisis peritoneal en el paciente pediátrico: diagnóstico y tratamiento / Peritoneal dialysis-related infections in pediatric patients: diagnosis and treatment review

Resumen Las infecciones asociadas a diálisis peritoneal (DP), corresponden a la principal complicación de los pacientes pediátricos en esta terapia de reemplazo renal, disminuyendo la sobrevida de la membrana peritoneal y empeorando el pronóstico del paciente. El reconocimiento precoz y un tratamiento oportuno de éstas son fundamentales para preservar esta modalidad dialítica. Se presenta una revisión actualizada de la literatura científica, con el fin de entregar recomendaciones reproducibles en los distintos centros pediátricos que realizan diálisis peritoneal crónica en niños.

Peritoneal dialysis-related infections are the main complication in pediatric patients undergoing this renal replacement therapy, associating a high rate of morbidity, generating also a decreasing survival of the peritoneal membrane and worsening the patient outcome. We describe the recommended diagnostic and therapeutic modalities to treat dialysis-related in children.

A Case of Exit-Site Infection and Abscess by Mycobacterium Abscessus in a CAPD Patient / 영남의대학술지

Nontuberculous mycobacterial infections are a rare, but clinically important cause of infections in continuous ambulatory peritoneal dialysis (CAPD) patients. This is typically suspected when a patient does not respond to treatment with the usual antibiotics. We describe here a case of Mycobacterium abscessus exit site infection with abdominal wall abscess formation that was associated with CAPD, which required peritoneal catheter removal, surgical debridement of the abscess and long term antibiotic therapy.

A 15 year-review of peritoneal dialysis-related peritonitis: Microbiological trends and patterns of infection in a teaching hospital in Argentina / Peritonitis en diálisis peritoneal: características microbiológicas y patrones de infección a lo largo de 15 años en un hospital universitario en Argentina

This study reports the infectious peritonitis rates in 44 patients on peritoneal dialysis in three different systems over the last 15 years, covering clinical outcomes, exit-site infections, tunnel infections, causative microorganisms, and the history of susceptibility of organisms causing peritonitis, in order to establish our center-specific selection of empiric therapy. Two microbiological procedures were herein used: method A, where 100 ml of dialysate were centrifuged and cultured in standard media and into blood-culture bottles; and method B, where 10 ml were directly injected into blood-culture bottles. Swabs from the exit-site or tunnel were taken when purulent drainage was observed. There were 96 episodes of peritonitis during 110.43 patient-years (0.87 episodes/patient-year). Sensitivity of method A was 96.88% (93/96 episodes) versus 81.25% (78/96) of method B (p= 0.001). Gram stain sensitivity was 36.46%. The etiologic agents were 64 (56.64%) gram-positive cocci, 22 (19.47%) gram-negative fermentative rods, 20 (17.7%) gram-negative non fermentative rods, 5 (4.43%) yeasts, 1 (0.88%) micelial fungus, and 1 (0.88%) anaerobic rod. Fifty-five exit-site infections were documented (0.5 episodes/patient-year). Ceftazidime and imipenem showed excellent activity on gram-negative rods. There were 92.3% of methicillin-susceptible Staphylococcus aureus but only 33.3% of methicillin-susceptible coagulase- negative staphylococci; vancomycin was active against 100% of the gram-positive cocci. The clinical outcomes of peritonitis were 73 initial cure, 19 catheter removal and four related deaths. The empiric therapy in our center should be vancomycin plus ceftazidime or imipenem. Once the etiological agent and its susceptibility pattern are known, the deescalating therapy must be applied to avoid the emergence and spread of vancomycin-resistant microorganisms.

Se comunican las tasas de peritonitis infecciosa de 44 pacientes en tres sistemas diferentes de diálisis peritoneal durante los últimos 15 años. Se evaluaron evolución clínica, infecciones del sitio de salida y del túnel, y los microorganismos causales y su sensibilidad, a fin de seleccionar la mejor terapia empírica para nuestro centro. Se realizaron dos procedimientos microbiológicos, método A: 100 ml del dializado fueron centrifugados y cultivados por métodos convencionales y en frascos para hemocultivo; método B: 10 ml fueron directamente inoculados en frascos para hemocultivo. Los hisopados del sitio de salida y del túnel fueron realizados cuando se observó supuración. Se registraron 96 episodios de peritonitis en 110,43 paciente-años (0,87 episodios/paciente-año). La sensibilidad del método A fue 96,88% versus 81,25% del método B (p = 0,001). La sensibilidad de la coloración de Gram fue 36,46%. La distribución de los agentes etiológicos fue la siguiente: 64 (56,64%) cocos gram-positivos, 22 (19,47%) bacilos gram-negativos fermentadores, 20 (17,7%) bacilos gram-negativos no fermentadores, 5 (4,43%) levaduras, 1 (0,88%) hongo micelial, 1 (0,88%) bacilo anaerobio. Fueron documentadas 55 infecciones del sitio de salida (0,5 episodios/paciente-año). La ceftazidima y el imipenem mostraron una excelente actividad sobre los bacilos gram-negativos. La sensibilidad a meticilina fue de 92,3% para Staphylococcus aureus y 33,3% para estafilococos coagulasa negativos; la vancomicina fue activa frente al 100% de los cocos gram-positivos. La evolución clínica de las peritonitis fue: 73 curas, 19 remociones de catéter y cuatro muertes relacionadas. La terapia empírica en nuestro centro debería ser vancomicina más ceftazidima o imipenem. Una vez conocidos el agente etiológico y su sensibilidad, se debería aplicar la terapia de desescalonamiento para evitar la emergencia y diseminación de microorganismos resistentes a la vancomicina.

Prevalence of Staphylococcus aureus Nasal Carriage and CAPD-associated Infection / 대한신장학회잡지

BACKGROUND:Staphylococcu S. aureus (S. aureus) is one of the most important etiologic agents of CAPD-associated infection and the nasal carriage of S. aureus increases the risk of CAPD-associated infection. We evaluated the nasal carriage status of S. aureus in CAPD patients and the association between nasal carriage of S. aureus and CAPD-associated infection. METHODS:We did a retrospective study about 167 patients on CAPD who regularly visited outpatient department at Seoul National University Hospital, Seoul National University Boramae Hospital, Seoul National University Bundang Hospital. Nasal swab cultures for S. aureus were taken once between September of 2005 and February of 2006. RESULTS:Nasal swab culture showed that S. aureus nasal carriage rate was 22.2%. S. aureus nasal carrier group showed that increased incidence of exit site infection and peritonitis caused by S. aureus and all other causes of exit site infection, but these were statistically insignificant. In diabetic patients, S. aureus nasal carriage rate was 21.6%. The observation of these patients also showed that S. aureus nasal carriage insignificantly increased the incidence of exit site infection and peritonitis caused by S. aureus and all oth er causes of exit site infection. CONCLUSION:In our study, the S. aureus nasal carriers did not show significantly higher risk for development of exit site infection and peritonitis by S. aureus or all other causes of exit site infection.

The Effect of Catheter Revision on Intractable Exit Site Infection in CAPD Patients / 대한신장학회잡지

BACKGROUND: Continuous ambulatory peritoneal dialysis (CAPD) is an important method of renal replacement therapy in chronic renal failure, and reduction of dialysis-associated complication is essential to successful peritoneal dialysis. But catheter related infection is a major cause of catheter loss and transferring to hemodialysis. We use an unique catheter revision method for the treatment of intractable exit-site/tunnel infection in CAPD patients. METHODS: We reviewed 322 CAPD patients on the ESI/TI from May 1995 to January 2003 at Yeungnam University Hospital. Forty-four patients had exit-site infection more than one times. Prevalence of exit-site infection, kinds of causative micro- organism and results of catheter revision were analyzed retrospectively. RESULTS: Total follow-up was 5, 834 patient months. ESI occurred on 141 occasions in 44 patients out of 322 patients and cumulative incidence of ESI was 1 per 41.4 patient months. We started empiric antibiotic therapy with oral penicillinase- resistant penicillin and quinolones, thereafter adjusted antibiotics according to the results of culture and sensitivity. The most common organism responsible for ESI was Staphylococcus aureus (MSSA, 34.8%), followed by Pseudomonas aeruginosa (25.5%). Nineteen patients had to be treated with catheter revision to control intractable ESI/TI. With analysis of ten patients who showed relapsed ESI after catheter revision, 5 patients improved with antibiotic therapy and 3 patients improved with additional secondary revision, but remaining 2 patients showed removal of peritoneal catheter to treat combined peritonitis. CONCLUSION: Catheter revision technique can be regarded as an effective alternative method to treat intractable exit site/tunnel infection before removal of catheter in CAPD patients.

Catheter Ultrasonography as a Tool in the Diagnosis of Tunnel Infection in CAPD Patients / 대한신장학회잡지

In CAPD patients, exit site infection and peritonitis are occasionally not improved due to undetected tunnel infection. The diagnosis of tunnel infection is mainly based on the clinical symptoms and signs which seem insensitive for early diagnosis and timely intervention. We examined usefulness of catheter ultrasonography(USG) as a tool in the diagnosis of tunnel infection in various kinds of infectious complications in CAPD patients. Positive result was defined by the presence of hypoechoic area more than 2mm in diameter along the subcutaneous catheter tunnel. 26 USG were performed in 23 patients who represented normal in 4 cases, exit site infections in 6 cases, tunnel infections in 2 cases, peritonitis in 10 cases and 4 cases of combined infections. The mean age was 53.6 years and mean duration of CAPD and break-in period were 16.7 months and 24.7 days respectively. Positive USG findings were noted in 13 cases(50%). High rate of positive finding was observed in clinically suspected exit site infection (80.3%), tunnel infection(100%) and combined infections (75%). Positive results were most commonly observed near the external cuff area. The most common causative organism was S. aureus followed by Pseudomonas and CNS infections. S. aureus infection most likely resulted in positive sonographic findings and catheter loss despite of antibiotic treatment. We conclude that USG is a sensitive tool for the diagnosis of tunnel infections and tunnel infection caused by S. aureus is at high risk of catheter loss.

Catheter Ultrasonography as a Tool in the Diagnosis of Tunnel Infection in CAPD Patients / 대한신장학회잡지

In CAPD patients, exit site infection and peritonitis are occasionally not improved due to undetected tunnel infection. The diagnosis of tunnel infection is mainly based on the clinical symptoms and signs which seem insensitive for early diagnosis and timely intervention. We examined usefulness of catheter ultrasonography(USG) as a tool in the diagnosis of tunnel infection in various kinds of infectious complications in CAPD patients. Positive result was defined by the presence of hypoechoic area more than 2mm in diameter along the subcutaneous catheter tunnel. 26 USG were performed in 23 patients who represented normal in 4 cases, exit site infections in 6 cases, tunnel infections in 2 cases, peritonitis in 10 cases and 4 cases of combined infections. The mean age was 53.6 years and mean duration of CAPD and break-in period were 16.7 months and 24.7 days respectively. Positive USG findings were noted in 13 cases(50%). High rate of positive finding was observed in clinically suspected exit site infection (80.3%), tunnel infection(100%) and combined infections (75%). Positive results were most commonly observed near the external cuff area. The most common causative organism was S. aureus followed by Pseudomonas and CNS infections. S. aureus infection most likely resulted in positive sonographic findings and catheter loss despite of antibiotic treatment. We conclude that USG is a sensitive tool for the diagnosis of tunnel infections and tunnel infection caused by S. aureus is at high risk of catheter loss.

The Effects of Catheter Revision and Mupirocin on Exit Site Infection/Peritonitis in CAPD Patients / 대한신장학회잡지

BACKGROUND: Exit site/tunnel infection causes con-siderable morbidity and technique failure in CAPD patients. We presently use a unique revision method for the treatment of refractory ESl/TI in CAPD patients and mupirocin prophylaxis for high risk patients. MTEHODS: We reviewed one hundred-thirty nine CAPD patients about the ESI/TI from Qctober 1993 to February 1999 at Yeungnam University Hospital. At the beginning of the ESI, we usually started medications with rifampicin and ciprofloxacin and then changed the antibiotics according to the sensitivity test. If the ESI had persisted and there were TI symptoms(purulent discharge, abscess lesion around exit site), we performed catheter revision(external cuff shaving, disinfection around tunnel and new exit site on opposit direction) with a combination of proper antibiotics. We applied local mupirocin ointment at the exit site three times per week to the 34 patients who had the risk of ESI starting from October 1998. RESULTS: The total follow-up was 2401 patient months (pt.mon). ESI occurred on 105 occasions in 36 out of 139 patients, and peritonitis occurred on 112 occasions in 67 out of 139 patients. Cumulative incidence of ESI and peritonitis was 1 per 23.0 pt.mon and 1 per 21.6 pt.mon. The most common organism responsible for ESI was Staphylococcus aureus (26 of 54 isolated cases, 43%), followed by Methicillin resistant S. aureus (MRSA)(13 cases, 24%). Seven patients (5: MRSA, 2: Pseudomonas) had to be treated with a revision to control infection. Three patients experienced ESI relapse after revision. One of them improved with antibiotics, while another needed a second revision and the remaining required catheter removal due to persistent MRSA infection with reinsertion at the same time. But, there was no more ESI in these 3 patients who were received management to relapse (The mean duration : 14.0 months) The rates of ESI were more reduced after using mupirocin than before (l per 12.7 vs 34.0 pt.mon, p<0.01). CONCLUSION: In summary, revision technique can be regarded as an effective method for refractory ESI/TI before catheter removal. Also local mupirocin ointment can play a significant role in the prevention of ESI.

The Type and Outcome of Exit-Site Infection in CAPD Patients / 대한신장학회잡지

Exit-site infection(ESI) is a troublesome catheter related complication of CAPD that may lead to peritonitis and require catheter removal, ESI is variably defined and classified. The rate of ESI and the outcome of treatment are also variably reported in literature. We conducted a retrospective study of 58 episodes of ESI(40 patients) between August 1997 and February 1999, and evaluated the episodes and types of ESI, organism isolated from ESI and their sensitivity, outcome of ESI, number and reason for catheter loss, and the current modality. The mean age was 48.9+/-11.5 years(31-70) and the male to female ratio was 22:18. The mean duration of CAPD before ESI was 34.1+/-29.6 months (1.5-114.2), and diabetic nephropathy was the cause of ESRD in 17.5% of cases. The types of catheter were two-cuff, coiled Tenckhoff in 17 patients, two-cuff, coiled swan-neck in 10 patients, two-cuff, straight swan-neck in 10 patients, and two-cuff, straight Tenckhoff in 3 patients. According to Twardowski's classification, acute infection in 33 patients and chronic infection in 25 patients were noted. Causative organisms of ESI were S. aureus, S. epidermidis, Pseudomonas, and E. cali in diminishing order of frequency. S. aureus was the most common organism in acute infection, and S. epidermidis was the most common organism in chronie infection. The mean duration of CAPD before ESI was 27.6+/-27.2 months in acute infection, and 42.8+/-30.8 in chronic infection (p<0.05). The duration of antibiotic treatment was 19.9+/-14.4 days in acute infection, and 42.7+/-27.2 days in chronic infection(p<0.05). In acute infection, peritonitis developed in 2 patients and 1 catheter was removed. In chronic infection, peritonitis developed in 1 patient and the catheter was removed. Three patients had the external cuff shaved due to persistent ESI which was unresponsive to antibiotics and local care. By the end of the study, 36 patients(90%) were still on CAPD, 2 patients(5%) had transferred to hemodialysis, and 2 patients(5%) had died. The cause of death was peritonitis in 1 patient, and cachexia in the other patient. In conclusion, exit-site infection responded relatively well to conservative treatment. However, exit-site infection is one of the major causes of catheter failure in CAPD. Therefore, careful exit-site care and examinations are needed.

The Effects of Catheter Revision and Mupirocin on Exit Site Infection/Peritonitis in CAPD Patients / 영남의대학술지

BACKGROUND: Exit site/tunnel infection causes cosiderable morbidity and technique failure in CAPD patients. We presently use a unique revision method for the treatment of refractory ESI/TI in CAPD patients and mupirocin prophylaxis for high risk patients. MATERIALS AND METHODS: We reviewed 139 CAPD patients about the ESI/TI from October 1993 to February 1999 at Yeungnam University Hospital. At the beginning of the ESI, we usually started medications with rifampicin and ciprofloxacin and then changed the antibiotics according to the sensitivity test. If the ESI had persisted and there were T1 symptoms(purulent discharge, abscess lesion around exit site), we performed catheter revision(external cuff shaving, disinfection around tunnel and new exit site on opposit direction) with a combination of proper antibiotics. We applied local mupirocin ointment at the exit site three times per week to the 34 patients who had the risk of ESI starting from October 1998. RESULTS: The total follow-up was 2401 patient months(pt. mon). ESI occurred on 105 occasions in 36 out of 139 patients, and peritonitis occurred on 112 occasions in 67 out of 139 patients. The total number of incidences of ESI and peritonitis was 1 per 23.0 pt.mon and 0 per 21.6 pt.mon. The most common organism responsible for ESI was Staphylococcus aureus(26 of 54 isolated cases, 48%), followed by the Methicillin resistant S. auresu(MRSA) (13 cases, 24%). Seven patients(5: MRSA, 2: Pseudomonas) had to be treated with a revision to control infection. Three patients experienced ESI relapse after revision. One of them improved with antibiotics, while another needed a second revision and the remaining required catheter removal due to persistent MRSA infection with re-insertion at the same time. But, there was no more ESI in these 3 patients who were received management to relapse (The mean duration: 14.0 months). The rates of ESI were significantly reduced after using mupirocin than before(1 per 12.7 vs 34.0 pt.mon, p<0.01). CONCLUSION: In summary, revision technique can be regarded as an effective method for refractory ESI/T1 before catheter removal. Also local mupirocin ointment can play a significant role in the prevention of ESI.