Ya-Wen Chuang

Taichung Veterans General Hospital, Taichung, Taiwan, Taiwan

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Publications (21)31.84 Total impact

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    ABSTRACT: Idiopathic membranous nephropathy (MN) is one of the most common causes of nephrotic syndrome in adults, and 25% of MN patients proceed to ESRD. Urokinase plasminogen activator (uPA) may play an important role in reducing renal fibrosis. This study was conducted to clarify the relationship between uPA gene polymorphisms and clinical manifestations of MN. We recruited 91 biopsy-diagnosed MN patients and 105 healthy subjects. Genotyping of uPA gene 3'-UTR T/C polymorphism was performed by polymerase chain reaction methods. The genotype distribution had no effect on the development of MN. Thirteen patients (15.9%; P = 0.008) acquired malignancies and seventeen (20.7%; P = 0.006) patients progressed to ESRD with the C/C genotype, but no patients with the T/C genotype did. In conclusion, we demonstrated that the presence of the uPA gene 3'-UTR C/C genotype was associated with ESRD as well as acquired malignancies in MN patients. These findings should prompt specific considerations for the treatment of MN patients to maintain a balance between treating disease entities and protecting the immune system from cancers.
    BioMed research international. 01/2014; 2014:425095.
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    ABSTRACT: OBJECTIVE: Peritoneal dialysis (PD) is an alternative treatment for elderly patients with end-stage renal disease (ESRD. In Taiwan, non-professional personnel are employed to provide assisted care for elderly patients. Whether assisted care is appropriate for elderly patients is unknown. The aim of this paper is to evaluate the outcomes of assisted care in a single center. METHOD: This is a retrospective cohort study in a single medical center. The outcomes were derived from the assessment of patient survival, technique survival and peritonitis incidence between self-care patients and assisted-care patients. RESULTS: From 1984 to 2010, there were 138 elderly PD patients at Taichung Veterans General Hospital, of which 70% were assisted-care patients and 30% self-care patients. The mean duration of PD survival was 49.2 months in self-care patients, which was significantly longer than the 17.0 months of assisted-care patients (P<0.05). Using the multivariate Cox proportion regression model to adjust for risk factors, it was found that self-care patients had a lower risk in both patient survival (Hazard Ratio 0.15; 95 % CI 0.2-0.94, P <0.05) and technique survival (Hazard ratio; 0.11 , 95% CI 0.1-0.9, P <0.05). Fluid overloading was the major cause of technique failure in assisted-care patients. Type of assistance was not a risk factor for PD-related peritonitis. CONCLUSION: Our elderly assisted care had patients had a poorer survival and technique survival rates than those of the self-care patients. We argue that this is because early recognition of medical deterioration and early medical intervention are necessary for a better outcome for elderly PD patients.
    Nephrology 04/2013; · 1.69 Impact Factor
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    ABSTRACT: Background: Upper gastrointestinal bleeding (UGIB) is a major cause of clinical bleeding among patients with end-stage renal disease (ESRD). This study aimed to investigate the association between mortality and UGIB in patients with uremia. Methods: From 2004 to 2010, a tertiary hospital-based retrospective cohort comprising 322 patients undergoing hemodialysis was investigated. All the patients were diagnosed with UGIB according to the International Classification of Diseases, 9th Revision (ICD-9) that included peptic ulcer bleeding, duodenal ulcer bleeding, and other symptoms. UGIB was required to be one of the first three discharge diagnoses. Rehospitalization within 3 days after discharge was regarded as the same course. Exclusion criteria were age <20 years, previous gastric resection or vagotomy, esophageal and gastric variceal bleeding, or gastric cancer within the first 2 years of the index hospitalization. Results: The all-cause in-hospital mortality rate of patients with UGIB undergoing hemodialysis was high, with the first-month mortality rate of 13.7%, sixth-month mortality rate of 26.7%, and first-year mortality rate of 27.0%. Using Cox regression models, we found that the high mortality rate of the UGIB group was significantly correlated with older age [adjusted hazard ratio (HR) = 1.02, 95% confidence interval (CI) = 1.01-1.04], female sex (adjusted HR = 1.62, 95% CI = 1.05-2.51), infection during hospitalization (adjusted HR = 1.85, 95% CI = 1.13-3.03), single episodic UGIB (adjusted HR = 2.00, 95% CI = 1.08-3.70), abnormal white blood cell (WBC) count (adjusted HR = 1.59, 95% CI = 1.03-2.45), and albumin level ≤3 g/dL (adjusted HR = 2.67, 95% CI = 1.51-4.72). Conclusion: In conclusion, patients with ESRD who are admitted with primary UGIB have a profoundly increased risk of all-cause in-hospital mortality during the follow-up period.
    Renal Failure 01/2013; · 0.94 Impact Factor
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    ABSTRACT: Background: The blood and membrane contact during dialysis may elicit an immune reaction. The current study looked at the impact of different dialyzers on blood levels of cytokines. Methods: During the first month, randomly selected patients were treated with one dialyzer (PF-170H) and then crossed over to another dialyzer (FLX-18GW) during the next month. Pre- and postdialysis blood samples were assayed for interleukin (IL)-6, IL-10 and IL-18. Results: A significant drop of postdialysis systolic blood pressure (pre vs. post 156.4 ± 31.8 vs. 143.1 ± 24.8 mm Hg, p = 0.014) and diastolic pressure (80.7 ± 12.7 vs. 73.4 ± 10.9 mm Hg, p = 0.002) were found when patients were dialyzed with PF-170H. A significant increase of postdialysis IL-18 levels was found in both groups (pre vs. post 605.5 ± 278.6 vs. 690.6 ± 315.3 pg/ml, p = 0.016, for PF-170H and 556.4 ± 231.0 vs. 647.3 ± 282.6 pg/ml, p = 0.067, for FLX-18GW). There was a positive correlation between IL-6 and IL-10 levels (p < 0.0001). Conclusion: We demonstrated a significant increase of postdialysis serum IL-18 level when either dialyzer was used. There is a strong correlation between serum levels of IL-6 and IL-10. © 2013 S. Karger AG, Basel.
    Blood Purification 01/2013; 36(3-4):295-300. · 2.06 Impact Factor
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    ABSTRACT: Induction therapy with interleukin-2 receptor antagonist (IL2RA) is widely used for renal transplant recipients and this study aimed to examine the impact of IL2RA among Chinese renal transplant recipients. Two hundred and thirty-eight Chinese renal transplant recipients aged 18-65 years at the Taichung Veterans General Hospital from January 2004 to July 2009 were retrospectively studied to assess the influence of IL2RA on biopsy-proven acute rejection (BPAR) within 1 year. Secondary outcomes included acute rejection rate in the first 3 months, delayed graft function, post-transplant diabetes mellitus, and malignancy. Cox proportional hazard analysis was used for multivariate analysis. Of all the patients, 116 received IL2RA (basiliximab, n = 44; daclizumab, n = 72) and 122 had no induction therapy. The mean follow-up duration was 43.3 months (range, 1-79 months). Overall, 227 (95.4%) patients completed the 12-month follow-up period with a functioning graft. No difference of BPAR was observed between the two groups and the secondary outcomes were also similar. After adjusting potential covariates with Cox regression, IL2RA use still provided no benefit on BPAR. In conclusion, there is no benefit of IL2RA in decreasing BPAR was observed in our study. Routine use of IL2RA for adult Chinese kidney transplant recipients may not be as effective as we thought before. More research is still needed to elucidate the effect of IL2RA among Chinese kidney transplant recipients.
    Renal Failure 05/2012; 34(7):856-61. · 0.94 Impact Factor
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    ABSTRACT: A strong positive correlation between estimated glomerular filtration rate (eGFR) multiplied by follow-up time and memory function has been demonstrated previously. The purpose of this study was to investigate the factors affecting progression of cognitive dysfunction in the elderly with different levels of kidney function. In April 2002, a prospective study on progression of cognitive function was conducted on 356 elderly people. All participants received a comprehensive geriatric assessment, serum biochemical test, homeostasis model assessment (HOMA), and a genetic polymorphism study, including polymorphism of apolipoprotein E (APOE), Cystatin, C-reactive protein (CRP) and tumor necrosis factor (TNF). Lean body mass-adjusted eGFR was used to evaluate severity of chronic kidney disease (CKD), and a clinical dementia rating scale was used to assess cognitive dysfunction. Patients were stratified according to eGFR (≥49 mL/min and <49 mL/min). Using multivariate logistic regression models, older age (OR=1.27, 95% CI=1.00-1.61) was associated with a high risk for progression of cognitive function in patients with a relatively low eGFR. In patients with lower eGFR, higher mini-mental state examination (MMSE) scores (OR=0.23, 95% CI=0.10-0.54) were correlated with a low risk for progression of cognition, while in patients with higher eGFR, higher MMSE scores (OR=0.39, 95% CI=0.23-0.65) were less correlated with cognitive dysfunction. However, elevated serum plasminogen activator inhibitor-1 (PA1-1) was associated with a high risk for cognitive dysfunction (OR=1.06, 95% CI=1.01-1.11) in patients with a better eGFR. Age, MMSE score and serum PAI-1 were found to be factors that predicted cognitive dysfunction at different functional levels of CKD.
    Internal Medicine 01/2012; 51(1):29-35. · 0.97 Impact Factor
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    ABSTRACT: Variability of blood trough concentration (C0) in immunosuppressant leads to rejection and graft loss after kidney transplantation. The aim of this study is to prospectively investigate the change of within-patient variability among stable kidney transplant recipients with conversion from twice-daily Prograf to the same milligram-for-milligram daily dose of once-daily Advagraf. The mean age of 129 patients was 51.3±12.1 years. The conversion to Advagraf was administrated at 6.3±4.8 years after transplantation. The daily dose was changed from 4.7±2.0 mg to 4.9±2.1 mg after conversion. Only six patients increased daily dose by 16.7% to 25% to maintain target levels. The whole blood C0 of tacrolimus before conversion was 5.9±1.7 ng/mL. The mean C0 was significantly reduced after conversion to Advagraf; it was 4.9±1.5 ng/mL on the seventh day (P<0.001) and 5.4 to 5.5 ng/mL at 1 to 6 months (P<0.05). Forty-one (31.8%) patients have reduced C0 of more than 25% on the seventh day. The percent coefficient of variation of tacrolimus C0 more than 22.5% before conversion is associated with higher risk of reduced C0 after conversion (P<0.05). Compared with before conversion, less kidney transplant recipients have percent coefficient of variation more than 22.5% after conversion (3.1% vs. 17.4% with P<0.01). The results support that conversion from Prograf to Advagraf among kidney transplant recipient leads to a significantly lower C0 and within-patient variability of tacrolimus C0. The within-patient variability of C0 before conversion influences C0 on the sevent day after conversion to Advagraf.
    Transplantation 09/2011; 92(6):648-52. · 3.78 Impact Factor
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    ABSTRACT: Interleukin-1 (IL-1) is involved in the disease process of peritonitis. We hypothesize that IL-1 gene polymorphism may have an impact on the occurrence of peritonitis in uremic patients undergoing peritoneal dialysis (PD). Uremic patients were recruited for the study of IL-1β (-511) C/T gene polymorphism in 2002. These patients were then prospectively followed up to monitor their peritoneal membrane characteristics, biochemical parameters, occurrence of peritonitis and patient as well as PD technique survival. A total of 74 patients were enrolled in the study. During follow-up, at least one episode of peritonitis occurred in 36 patients. Compared with patients without peritonitis, the carriage of C allele in IL-1β gene polymorphism (C/C and C/T genotypes) was significantly associated with the occurrence of peritonitis (p = 0.013). This was further confirmed in the multivariate logistic regression analysis (odds ratio 8.18, p = 0.017). Carriers of C allele were associated with an increased risk of peritonitis.
    Blood Purification 06/2011; 32(3):156-60. · 2.06 Impact Factor
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    ABSTRACT: Although rare, renal amyloidosis is an important diagnosis that bares a significant morbidity and mortality. The purpose of this study was to present current single center experience in the past 28 years. A total of 6151 kidney biopsies were performed in our hospital from Jan. 1983 to Dec. 2010; 5844 were native kidney biopsies. Cases with a diagnosis of renal amyloidosis were identified through a search of our data bank and the clinical data were retrieved from medical charts. The patients were further classified as AL type and non-AL type. The trend of incidence was analyzed and the clinical features were compared. Risk factors that predict patient mortality were discovered by logistic regression analysis. Forty out of 5844 native kidney biopsies (0.68%) were identified as renal amyloidosis. Eighteen (45%) were of AL type. The mean age at diagnosis was 62.6 ± 13.4 years. Male was the predominant gender that was involved. Clinically, most (80%) have nephrotic range proteinuria (mean 24 hours urine protein: 6.9 ± 4.7 g). With a mean follow-up duration of 1155 day, the 1-year and 5-year patient survival were 42.9% and 17.9%, respectively. eGFR at biopsy was the sole predictive factor for patient survival. Senile patients with nephrotic syndrome should elicit the suspicion of renal amyloidosis. The incidence appeared to be increasing and the prognosis poor.
    Internal Medicine 01/2011; 50(21):2511-7. · 0.97 Impact Factor
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    ABSTRACT: BACKGROUND: Renal amyloidosis is an unusual diagnosis in patients undergoing kidney biopsy. Knowledge of the clinical features and long-term outcomes is still very limited. The current study represents our single-center experience in the past 27 years. METHODS: Six thousands renal biopsies were performed between January 1983 and June 2010 at Taichung Veterans General Hospital. Of them, 720 cases were from renal allograft and 5280 were from native kidneys. A retrospective study via chart review was conducted to identify cases of renal amyloidosis. The clinical features as well as laboratory data at presentation and subsequent follow-up were retrieved and analyzed. RESULTS: Among 5280 cases of native kidney biopsies, 35 renal amyloidosis (0.66%) were identified. The mean follow-up duration is 1155 days. The incidence of renal amyloidosis among proteinuric patients appeared to be increasing. The male to female ratio was 24:11. Seventeen (48.6%) cases were of light chain amyloidosis (AL) type while the others were of non-AL types. The mean age was 61.7 ± 12.9 years, while the duration between apparent onset and kidney biopsy was 299.4 ± 312.2 days. Most of the cases (83.9%) had nephrotic-range proteinuria. The mean 24-hour urine protein was 7.4 ± 4.7 g (median: 6.48 g/day, 2.13-22.9 g/day), serum albumin, 2.39 ± 0.7 g/dL; total cholesterol, 327.5 ± 144 mg/dL; and triglyceride, 223.7 ± 150 mg/dL. Hematuria occurred in 40% of the cases. The eGFR at renal biopsy was 56.3 ± 28.2 mL/min. There was no obvious enlargement in renal size (right kidney: 102.7 ± 15.6 mm, left kidney: 107.9 ± 14.2 mm). The one-year and five-year patient survival was 42.9% and 17.9%, respectively. Logistic regression analysis revealed that eGFR was the only predictive factor for patient survival. CONCLUSION: Elderly patients with nephrotic syndrome should prompt the suspicion of renal amyloidosis, especially in those with nephritic syndrome and relatively low blood pressure. Given the increasing incidence and poor prognosis, early diagnosis and a search of the underlying etiology of amyloidosis are mandatory. (Acta Nephrologica 2011; 25: 113-118)
    Acta Nephrologica. 01/2011; 25(3):113-118.
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    ABSTRACT: The more support elderly people have from their family, the less likely they are to suffer from chronic diseases. The objective of this study is to investigate how family support affects the PA middle-aged and elderly people engage in before and after they suffer from chronic diseases. We interviewed 428 middle-aged and elderly people using a structured questionnaire to measure their aerobic PA. Eighteen percent of middle-aged and elderly people did participate in PA after suffering from chronic diseases. Using multivariate logistic regression models, we found that middle-aged and elderly people who rely on family members when they are sick (OR=1.87, 95%CI=1.08-3.25) and who are accompanied by family members (OR=2.09, 95%CI=1.20-3.62) when they are healthy are more likely to exercise. The more middle-aged and elderly people are supported by their family, the more likely they are to exercise. Strengthening family relationships should help reduce the prevalence of chronic diseases among middle-aged and elderly people.
    Archives of gerontology and geriatrics 12/2010; 53(3):274-7. · 1.36 Impact Factor
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    ABSTRACT: The objective of this study was to determine the risk of renal failure in patients with under-recognized chronic kidney disease (CKD) in the self-pay standard medical screening program of health management centers. The abbreviated Modification of Diet in Renal Disease equation was used to calculate the estimated glomerular filtration rate (eGFR) of study subjects. Study subjects with eGFR less than 60 mL/min/1.73m(2) but with normal results of routine assessment, including serum creatinine, blood urea nitrogen, urinalysis and kidney ultrasound, were defined as having under-recognized CKD. Episodes of renal failure requiring dialysis within 2 years in subjects with stage 3 to stage 5 CKD were evaluated. A total of 15,817 subjects were recruited and 28.4% of subjects were identified by routine assessments as having a kidney problem. The prevalences of CKD 3A, 3B, 4 and 5 were 8.3%, 1.9%, 0.3% and 0.2%, respectively. All subjects with stages 4 and 5 CKD had abnormal serum creatinine levels, but 48.7% of 1,507 subjects with stage 3 CKD (stage 3A, n = 713; stage 3B, n = 21) had normal routine assessments. Subjects with under-recognized stage 3B CKD had the highest risk (20%) of developing renal failure compared to subjects with stages 3-5 CKD and abnormal results of routine assessments. Identifying subjects with CKD stage 3 by the eGFR equation, especially in stage 3B, is advantageous in detecting the risk of renal failure over the routine clinical assessment that is currently carried out by health management institutions in Taiwan.
    Journal of the Chinese Medical Association 10/2010; 73(10):515-22. · 0.75 Impact Factor
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    ABSTRACT: Elderly patients who are hospitalized with acute illnesses frequently have adverse outcomes. To maintain functional independence, the geriatric evaluation and management unit (GEMU) was established to provide the opportunity for functional recovery (FR). This study's aim was to investigate potential prognostic factors for functional improvement in a GEMU of Taichung Veterans General Hospital, Taiwan. A total of 117 elderly patients (age, 80.0+/-6.3 years, 84.6% males) were enrolled. A comprehensive geriatric assessment and functional status evaluation, including the functional reach test (FRT) and the timed up-and-go (TUG) test, were performed. FR was defined by a greater than 10% improvement in the Barthel Index (BI) before GEMU discharge. Lower BI (44.7+/-25.2 vs. 68.7+/-34.5, p < 0.001), lower instrumental activities of daily living (IADL) scores (1.8+/-1.5 vs. 3.5+/-2.6, p < 0.001), impaired FRT (83.3% vs. 63.5%, p = 0.028), and impaired TUG test (94.4% vs. 74.6%, p = 0.008) were predictive factors for functional improvement. On multivariate logistic regression, an impaired TUG test (Odds ratio = OR = 6.18, 95% confidence interval = 95% C.I. = 1.69-22.6, p = 0.006) was an independent variable associated with FR. The results indicate that elderly hospitalized patients, even with poor physical function, could benefit from geriatric integrated care delivered by a GEMU.
    Archives of gerontology and geriatrics 02/2010; 50 Suppl 1:S1-5. · 1.36 Impact Factor
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    ABSTRACT: Circulating levels of inflammatory and prothrombotic factors are elevated in the metabolic syndrome (MS) and linked with the occurrence of cardiovascular events. The aim of our study was to investigate the relationship between inflammatory and prothrombotic markers and the MS in elderly institutionalized residents. A total of 326 non-diabetic residents of Chuang-Hua Veterans Care Home (age: 79.9+/-4.1 years; 100% males) were enrolled. MS was diagnosed according to the AHA/NHLBI Scientific Statement criteria. Body fat percentage was measured by bioelectrical impedance analysis. Insulin resistance was calculated by homeostasis model assessment for insulin resistance (HOMA-IR). Inflammatory markers, including tumor necrosis factor-a (TNF-alpha), high sensitivity C-reactive protein (hsCRP), and plasminogen activator inhibitor-1 (PAI-1), were determined using ELISA. Elderly residents with the MS had higher systolic and diastolic blood pressures (both p < 0.001) and higher HOMA-IR (p < 0.001), hsCRP (p = 0.008), and PAI-1 levels (p < 0.001) than those without the MS. On multivariate logistic regression analysis, PAI-1 was an independent risk factor for the MS. Of the MS components, elderly residents with higher waist circumferences and higher levels of plasma fasting glucose, and triglyceride (TG), and lower levels of high density lipoprotein (HDL) had higher PAI-1 levels than those without the above components.
    Archives of gerontology and geriatrics 12/2009; 49 Suppl 2:S41-5. · 1.36 Impact Factor
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    ABSTRACT: This study investigated the relationship between hyperuricemia (HUC) and the components of the metabolic syndrome (MS) among elderly institutionalized men. In addition, this study explored the relationship between HUC and serum inflammatory markers. A total of 333 participants from Chang-Hua Veterans Care Home were enrolled. The MS was defined using a modified ATP III definition issued in 2004 by the Bureau of Health Promotion, Department of Health, ROC (Taiwan). The participants' mean age was 78.6+/-3.9 years, and their mean serum uric acid level was 6.9+/-1.7 mg/dl. The prevalence of HUC was 46.2% (n = 154). The prevalence of the MS was 38.4% (n = 128). HUC was correlated with components of the MS, including waist circumference (WC), triglyceride (TG), and high density lipoprotein cholesterol (HDL-C) but it was not related to blood pressure (BP) and fasting plasma glucose (FPG). Moreover, increased serum creatinine, albumin, prealbumin, and body fat were also associated with HUC. The plasma activator inhibitor-1 (PAI-1) levels were significantly elevated in the HUC group, but serum interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-alpha), serum intercellular cell adhesion molecule-1 (sICAM-1), serum levels of vascular cell adhesion molecule-1 (sVCAM-1), and P-selectin were not related to HUC. HUC in elderly men may represent poorer renal function, better nutritional status, and increased body fat.
    Archives of gerontology and geriatrics 12/2009; 49 Suppl 2:S46-9. · 1.36 Impact Factor
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    ABSTRACT: The incidence of ischemic stroke increases with age, and it has a great impact on patients' functional independence. The aim of this study was to analyze the clinical features, laboratory findings, and stroke subtypes in different age subgroups and identify the predictive factors for functional independence 6 months after stroke. A total of 533 patients with first-ever ischemic stroke were enrolled in this study. They were divided into two subgroups: more than 80 years old (n = 108) and less than 80 years old (n = 425). Patients aged 80 years or over had higher frequencies of heart disease and atrial fibrillation, and lower frequencies of dyslipidemia, alcohol drinking, and a family history of ischemic stroke. Significantly lower body mass index, serum albumin levels, and lipid profiles, including total cholesterol, low-density lipoprotein, and triglyceride levels, but higher severity of initial neurologic deficit, and higher rates of mortality and complications during hospitalization were noted in patients aged over 80 years. The multivariate logistic regression analysis showed that higher serum total cholesterol level, less severity of neurologic deficit at admission, and absence of a history of diabetes mellitus were predictive of functional independence 6 months after stroke.
    Archives of gerontology and geriatrics 12/2009; 49 Suppl 2:S26-31. · 1.36 Impact Factor
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    ABSTRACT: Pulmonary hypertension (PH) is an overlooked cardiovascular morbidity in patients undergoing haemodialysis. Inflammation has been demonstrated to play a significant role with certain types of PH in non-uraemic patients, but studies analysing the mechanisms in dialyzed patients with PH are rare. Hence, we investigated systemic and local inflammation biomarkers associated with PH in uraemia patients to elucidate the potential mechanism. A cross-sectional study was conducted in which 97 haemodialysis patients were initially evaluated in our hospital. Twelve inflammatory cytokines were measured using a cytometric beads assay in patients with and without PH. FE(NO) (fractional exhaled nitric oxide) was checked by a chemiluminescence analyser in patients with and without PH as well as by normal controls. Thirty-nine eligible patients were enrolled. Compared to patients without PH (group A), patients with PH (group B) had significantly higher serum levels of hs-CRP, IL-1beta, TNF-alpha and IL-6. FE(NO) was also measured. Though the pre-dialysis FE(NO) levels were elevated in both groups; group B patients had significantly higher pre-dialysis FE(NO) levels than group A patients (39.9 +/- 16.7 versus 31.8 +/- 10.3, P = 0.045). The post-dialysis FE(NO) levels returned to normal in group A while the remaining were significantly higher in group B (30.3 +/- 10.3 versus 20.1 +/- 10.9, P = 0.003). Our study revealed that dialyzed patients with PH had a significantly higher level of airway FE(NO) as well as serum levels of acute phase reactive protein and cytokines, including IL-1beta, TNF-alpha and IL-6. A chronic inflammation might play an important role in the pathogenesis of PH in patients undergoing haemodialysis.
    Nephrology Dialysis Transplantation 02/2009; 24(6):1946-51. · 3.37 Impact Factor
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    ABSTRACT: Hypokalaemia is a relatively common complication in uraemic patients undergoing continuous ambulatory peritoneal dialysis (CAPD). The hazards of hypokalaemia are multiple and have been correlated with patient morbidity and mortality. Whether it is associated with increased risk of peritonitis remains to be addressed. We retrospectively analysed our CAPD patients who had complicating peritonitis in a 2-year period. The influence of hypokalaemia on the clinical features of peritonitis was assessed. From September 2003 to August 2005, 140 unselected patients undergoing CAPD treatment and followed up in our hospital were recruited for the study. Hypokalaemia was defined as a serum potassium level <3.5 mmol/l. The impact of hypokalaemia on several clinical parameters, including the nutrition status, dialysis adequacy, occurrence of peritonitis and the etiologic pathogens, was analysed. During the study period, 462 determinations (23.6%) were below quantity <mmol/l. The overall peritonitis rate was 30.6 patient-month per episode (total 64 episodes). The prevalence of peritonitis was significantly higher in patients with hypokalaemia (6.9%) compared to those without hypokalaemia (2.1%, P < 0.001). Hypokalaemia was also associated with lower serum albumin (P < 0.001), serum phosphate (P < 0.001), total serum cholesterol (P = 0.049) and normalized protein nitrogen appearance (P < 0.001). There was no correlation between serum potassium level and daily PD exchange volume, total Kt/V, urine volume or daily ultrafiltration volume. The peritoneal equilibration test was not significantly different between patients with and without hypokalaemia. When the aetiologic organisms of peritonitis were grouped according to their usual site of colonization, Enterobacteriaceae appeared to be much more prevalent than epidermal microorganisms (53.1% versus 18.8%, P = 0.004) in the hypokalaemia group. However, this was not the case in patients with normal serum potassium. CAPD patients with hypokalaemia are associated with a higher prevalence of peritonitis and poor nutritional status. Enterobacteriaceae were the predominant organisms causing peritonitis in the group with hypokalaemia. This unique and novel finding implies the translocation of these organisms from intestinal mucosa into the peritoneal cavity. A pathogenic mechanism linking malnutrition and hypokalaemia is also proposed.
    Nephrology Dialysis Transplantation 12/2008; 24(5):1603-8. · 3.37 Impact Factor
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    ABSTRACT: We have previously demonstrated that hypokalaemia is a risk factor for enteric peritonitis in CAPD patients. The underlying mechanism is unclear, and there have been no similar reports. We hypothesized that hypokalaemia may result in dysmotility of the intestinal tract and in turn cause bacterial overgrowth and subclinical translocation of enteral bacteria. Uraemic patients undergoing CAPD in our hospital were enrolled in the study. Hypokalaemia was defined as a serum potassium (K) level < or = 3.5 mEq/L despite treatment for 1 month. A breath hydrogen test (BHT) was performed to detect if intestinal bacterial overgrowth was present. Blood samples were also collected for the study of inflammatory cytokines, including interleukin 1 (IL1), IL2, IL6, IL8, TNF-alpha and gamma-IFN. A total of 68 patients were recruited. Hypokalaemia was present in 18 cases (26.5%, group 1), while 50 cases (group 2) had normal serum K levels. A higher prevalence of abnormal BHT was found in group 1 (27.8%), compared with group 2 (8.0%, P = 0.048). There was a trend towards a higher prevalence of abnormal BHT in diabetes mellitus (DM) patients with hypokalaemia (80.0%) compared with normal kalaemia (22.2%, P = 0.09), while no similar trends were found in non-DM hypokalaemic patients (7.7 versus 4.9%). When comparisons were made among different subgroups, patients with DM and hypokalaemia had a significantly higher prevalence of abnormal BHT compared to non-DM, normokalaemic patients (P < 0.0004) and non-DM, hypokalaemic patients (P = 0.008). Multivariate logistic regression analysis revealed that DM was an independent risk factor for abnormal BHT (odds ratio: 12.39, 95% CI: 2.25-68.20, P = 0.004). There was no significant difference in serum albumin, Kt/V, weekly creatinine clearance, pattern of peritoneal equilibrium test, C-reactive protein and various inflammatory cytokines between the two groups. CAPD patients with hypokalaemia may have intestinal bacterial overgrowth. While both DM and hypokalaemia might contribute to this abnormality, only DM appeared to be the independent risk factor.
    Nephrology Dialysis Transplantation 11/2008; 24(4):1289-92. · 3.37 Impact Factor