K-H Chen

Chang Gung Memorial Hospital, T’ai-pei, Taipei, Taiwan

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Publications (10)24.77 Total impact

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    ABSTRACT: This study revealed that low-dose aliskiren treatment could attenuate proteinuria by interrupting the renin-angiotensin system in mice with lupus nephritis, and the beneficial effect was beyond blood pressure control. An in and ex vivo fluorescence imaging (using a non-invasion in vivo imaging system) showed intense labeling of renin in the kidneys of female MRL/lpr mice. In the study, Alzet mini-osmotic pumps were implanted into 6-week-old female MRL/lpr mice. Pumps were filled with either phosphate-buffered saline or a solution of aliskiren dissolved in phosphate-buffered saline (20 mg/kg/day) and replaced at 28-day intervals. Mice were sacrificed at four and eight weeks. To label cells for DNA synthesis, bromodeoxyuridine (BrdU) (50 mg/kg) was injected intraperitoneally an hour prior to sacrifice. The level of renin inhibition was adequate, as aliskiren-treated mice demonstrated higher renal renin mRNA expression than controls (p < 0.05). Although there were no significant differences in the systolic blood pressure (control versus aliskiren-treated: 127.20 ± 4.44 mmHg versus 103.80 ± 7.40 mmHg, p > 0.05) and heart rate (control versus aliskiren-treated: 680.50 ± 11.71 versus 647.80 ± 13.90, p > 0.05) of both groups after eight weeks, there was significant reduction of inflammatory cytokines (transforming growth factor-beta1, regulated on activation normal T cell expressed, monocyte chemoattractant protein-1 and osteopontin, p < 0.05), reduction of innate immunity (toll-like receptor 7, p < 0.05), as well as a reduction of glomerular proliferation and inflammation (BrdU-, CD45-, CD3- and F4/80-positive glomerular cells, p < 0.01) after aliskiren infusion, which might translate into an improvement in proteinuria (control versus aliskiren-treated: 493.7 versus 843.7 mg/g, p < 0.01) or weight gain (control versus aliskiren-treated: 5.65 ± 1.61 versus 8.67 ± 0.97%, p < 0.05).
    Lupus 12/2012; 22(2). DOI:10.1177/0961203312471871 · 2.48 Impact Factor
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    ABSTRACT: Tolerance to the analgesic effect of opioids complicates the management of persistent pain states. We tested whether the intrathecal infusion of small interfering RNA (siRNA) against β-arrestin 2 would reduce tolerance to chronic morphine use and the severity of precipitated morphine withdrawal. Intrathecal β-arrestin 2 (2 μg siRNA per 10 μl per rat) was injected once daily for 3 days. Rats then received a continuous intrathecal infusion of morphine (2 nmol h⁻¹) or saline for 7 days. Daily tail-flick (TF) and intrathecal morphine challenge tests were performed to assess the effect of intrathecal β-arrestin 2 siRNA on antinociception and tolerance to morphine. Naloxone withdrawal (2 mg kg⁻¹) was performed to assess morphine dependence. In the daily TF test, the antinociception of intrathecal morphine was increased and maintained in rats receiving β-arrestin 2 siRNA compared with the control group (morphine alone). In the probe response test, rats receiving morphine infusion with β-arrestin 2 siRNA treatment showed a significant left shift in their dose-response curve, as measured by per cent maximal possible effect (MPE), such that the AD₅₀ was significantly decreased by a factor of 5.6 when compared with that of morphine-infused rats. In the naloxone-induced withdrawal tests, rats receiving β-arrestin 2 siRNA injection with morphine infusion showed a significant reduction in four of the six signs of withdrawal. We show here that intrathecal β-arrestin 2 siRNA in rats enhances analgesia and attenuates naloxone-induced withdrawal symptoms. This may warrant further investigation in the context of long-term use of intrathecal opioids for controlling chronic pain.
    BJA British Journal of Anaesthesia 09/2011; 107(5):774-81. DOI:10.1093/bja/aer291 · 4.35 Impact Factor
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    ABSTRACT: Dantrolene is the drug of choice in treatment of malignant hyperthermia. However, dantrolene is hepatotoxic; thus prolonged use is not recommended in patients with active hepatic disease such as acute hepatitis or active cirrhosis because it may result in fatal hepatic failure. Use of dantrolene in a patient with end-stage liver disease undergoing liver transplantation (LTx) in whom suspected malignant hyperthermia developed has been reported rarely. Its effect on the liver allograft, which has sustained cold, warm, and reperfusion injuries, is currently unknown. We report a case in which low-dose dantrolene administered intravenously during LTx was effective in treating hyperthermia, hypercapnia, and hyperkalemia. Furthermore, its reported hepatotoxic effect seemed to not affect recovery of the allograft after LTx.
    Transplantation Proceedings 04/2010; 42(3):858-60. DOI:10.1016/j.transproceed.2010.02.023 · 0.95 Impact Factor
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    ABSTRACT: Our aim was to present the case of a pediatric biliary atresia patient who experienced rhabdomyolysis with severe cardiac arrhythmias associated with hyperkalemia, metabolic acidosis, and myoglobulinemia during liver transplantation. A 5-year-old girl, weighing 16.5 kg, with end-stage liver disease due to biliary atresia underwent living donor liver transplantation. A sudden onset of atrial fibrillation with rapid ventricular response was noted during the transplantation. The cardiac arrhythmia was associated with hyperkalemia, metabolic acidosis, and myoglobulinemia. Rhabdomyolysis was suspected. Hyperkalemia and metabolic acidosis were not corrected despite treatment with 10 mL of 50% glucose plus 6 U of regular insulin in 4 succeeding boluses and 110 mEq sodium bicarbonate before sending the patient to the intensive care unit. A corresponding decrease and normalization in serum potassium and correction of metabolic acidosis were noted as responses to a single dose of intravenous (20 mg) dantrolene. The patient was extubated 5 days after transplantation. The kidney function remained within normal limits during the rhabdomyolysis and the entire hospital stay. The patient was discharged 7 weeks later and is surviving with the original liver graft and satisfactory kidney function to date.
    Transplantation Proceedings 11/2008; 40(8):2821-2. DOI:10.1016/j.transproceed.2008.07.032 · 0.95 Impact Factor
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    ABSTRACT: We describe the anesthetic management in a 56-year old man with hepatocellular carcinoma and cirrhosis who underwent liver transplantation (LT). Pretransplantation workup showed a 3-cm wide by 10-cm long infrarenal abdominal aortic aneurysm (AAA) with chronic dissection. He subsequently underwent living donor LT. The total operative time was 12 hours. The systolic blood pressure was maintained at normal levels. Severe hypertension was not noted. Hypotension noted during the anhepatic phase was managed with increased volume infusion and small doses (0.1 mg) of intravenous phenylephrine. Metabolic acidosis and ionized hypocalcemia were corrected accordingly. Total blood loss was 460 mL. Blood or blood products were not given. The intravascular volume was replaced with 1400 mL of 5% albumin and 10,610 mL of crystalloid. Extubation was performed in the intensive care unit at 12 hours after the operation. The postoperative course was unremarkable. The patient is alive at 3 years after LT. Patients with AAA undergoing LT present a challenge to the anesthesiologist because among the risk factors for rupture, blood pressure is the only factor under his or her control during the operation. If blood loss can be kept to a minimum and hemodynamic stability achieved, a chronically small dissected AAA may not be a contraindication to LT.
    Transplantation Proceedings 11/2008; 40(8):2830-1. DOI:10.1016/j.transproceed.2008.08.042 · 0.95 Impact Factor
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    ABSTRACT: The aims of the study were to determine the effects of denervation on the function of the liver transplantation as a blood reservoir and to define its vulnerability to ischemic-reperfusion (I/R) injury after hemorrhagic shock. Hemorrhagic shock with a mean arterial blood pressure (MAP) of 40 to 50 mm Hg was induced by withdrawing blood at a rate of approximately 1 mL/min among 10 posttransplant denervated rats and 10 sham rats for 1 hour. The rats were then resuscitated by retransfusing the drawn blood with sacrifice under deep anesthesia at 1 hour after resuscitation. The total amount of blood required to achieve hemorrhagic shock was compared between groups as well as the vulnerability and reactions of the posttransplant denervated liver to I/R injury after hemorrhagic shock as assessed by gene expressions of c-jun, c-fos, tumor necrosis factor (TNF)-alpha, interleukin (IL)6, IL-10, and heat-shock protein 70 (HSP70). The volume of blood that had to be drawn to reach a MAP of 40 to 50 mm Hg was not significantly different between the groups. One hour of hemorrhagic shock followed by resuscitation resulted in significant increases in the genes expression of c-fos, TNF-alpha, IL-6, IL-10, and HSP70 in comparison to the control values, but no difference was observed between experimental and sham groups. We suggest that the function of the liver as a blood reservoir and the gene expressions of c-fos and pro- and anti-inflammatory cytokines, as well as the protective protein HSP70 in response to I/R injury, were not altered by liver transplantation.
    Transplantation Proceedings 10/2008; 40(7):2175-7. DOI:10.1016/j.transproceed.2008.07.098 · 0.95 Impact Factor
  • C-C Liang · J-T Fang · K-H Chen · C-C Hung · T-L Hwang · J-Y Huang
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    ABSTRACT: In continuous ambulatory peritoneal dialysis (CAPD)-related cases of fungal peritonitis, Candida parapsilosis (C. parapsilosis) has become as common as Candida albicans (C. albicans) in fungal isolates. This report describes a 74-year-old male CAPD patient who received bypass surgery for coronary artery disease, followed by an episode of bacterial peritonitis. The peritonitis was successfully treated with intraperitoneal antibiotics. However, C. parapsilosis peritonitis with concomitant pancreatitis and infected pseudocysts occurred one month later. Despite surgical drainage and intravenous administration of fluconazole, fungal peritonitis persisted. Finally, he died of nosocomial pneumonia. This case demonstrates the poor outcome of C. parapsilosis peritonitis, suggesting a more aggressive treatment in peritoneal dialysis patients.
    Clinical nephrology 07/2008; 69(6):461-3. DOI:10.5414/CNP69461 · 1.23 Impact Factor
  • C-C Hung · C-T Chang · C-C Lee · K-H Chen · C-C Yu · C-H Wu · J-Y Huang · M-S Wu · C-W Yang
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    ABSTRACT: The population of elderly patients entering chronic dialysis programmes is increasing. Elderly patients are susceptible to malnutrition and have multiple complicating disorders in addition to uraemia. Selecting appropriate dialysis modality is particularly critical in elderly patients. Continuous ambulatory peritoneal dialysis (CAPD) has many advantages to elderly patients; however, the clinical outcome varies for elderly CAPD patients. In comparison with Westerners, Southeast Asians have a small body mass index and may be more suited to CAPD therapy. To identify the prognostic predictors in elderly Southeast Asian patients, this historical cohort study analysed 144 patients aged > or = 65 years at initiation of CAPD. A group of haemodialysis (HD) patients aged > or = 65 years was utilised as the control group. Survival curves for patient and technique were derived from Kaplan-Meier analysis and were further analysed by Cox-Mantel log-rank test. To elucidate the impact of individual factors on patient survival, various significant univariables were further subjected to multivariate analysis. No significant increase existed for relative risk of technique failure in elderly patients compared with younger patients. This analytical data indicates that CAPD was as good as HD for elderly uraemic patients regarding to the patient survival. Diabetes, dependent patients, low albumin levels and previous HD history were significant poor prognostic factors for survival of elderly CAPD patients. In conclusion, CAPD is an effective modality of renal replacement therapy for Southeast Asian elderly patients. The technique survival was not affected by patient age.
    International Journal of Clinical Practice 03/2007; 63(2):254-60. DOI:10.1111/j.1742-1241.2006.01216.x · 2.54 Impact Factor
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    ABSTRACT: We have previously shown that leptospiral membrane lipoprotein preparation (LMLP) extracted from pathogenic Leptospira santarosai serovar Shermani stimulates the secretion of pro-inflammatory mediators in renal tubule epithelial cells, and implicated its role in the initiation of tubulointerstitial nephritis. Renal tubulointerstitial injury is characterized by inflammatory cell infiltrate; however, the stimuli for leukocyte recruitment are not fully understood. Initial studies by cytokine protein array analysis revealed significant upregulation of neutrophil-chemoattractant keratinocyte-derived chemokine (CXCL1/KC) at nanogram range of LMLP stimulation in cultured murine proximal tubule cells (PTCs). As PTCs express Toll-like receptors (TLRs), this study investigated the roles of TLR signaling pathways in PTCs stimulated by LMLP and its relation to CXCL1/KC secretion. The LMLP stimulated the early secretion of CXCL1/KC and enhanced the level of TLR2 mRNA expression in PTCs through time- and dose-dependent effect. The LMLP-stimulated secretion of human growth-related oncogene alpha, a functional homolog to murine KC, in TLR-defective human embryonic kidney 293 cells transiently transfected with TLR2-expressing plasmids and the response was augmented by coexpression of TLR1 and TLR2. Moreover, silencing of TLR2, myeloid differentiation factor 88, and TNF receptor-associated factor 6 with specific small interfering RNA significantly reduces the response caused by LMLP in PTCs. The LMLP-stimulated CXCL1/KC secretion was also significantly reduced by pre-incubating PTCs with a specific p38 inhibitor. These results indicate that LMLP stimulates the production of CXCL1/KC to recruit polymorphonuclear neutrophils at the site of inflammation through a TLR2-mediated pathway in renal tubule cells.
    Kidney International 06/2006; 69(10):1814-22. DOI:10.1038/sj.ki.5000362 · 8.52 Impact Factor
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    K-H Chen · C-C Liu · C-H Yang · C-H Wang · A M Concejero · H-N Luk · B Jawan
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    ABSTRACT: Pregnancy is often considered a contraindication to living related liver donation. There are serious medical and ethical considerations if a pregnant woman insists on undergoing partial hepatectomy to save her sick child. Herein we report a case of living related liver donation from a pregnant woman at 18 weeks of gestation to her 1-year-old child with decompensated cirrhosis due to biliary atresia. The left lateral segment of the liver was harvested for donation. Meticulous surgical technique and anesthetic management were mandatory in assuring a successful outcome. While this isolated case demonstrated that living related liver donation can be performed successfully with a pregnant donor, it should be undertaken only when there is absolutely no other donor and the recipient is in urgent need.
    International Journal of Obstetric Anesthesia 05/2006; 15(2):149-51. DOI:10.1016/j.ijoa.2005.10.003 · 1.83 Impact Factor

Publication Stats

58 Citations
24.77 Total Impact Points

Institutions

  • 2006–2012
    • Chang Gung Memorial Hospital
      • Division of Nephrology
      T’ai-pei, Taipei, Taiwan
  • 2011
    • National Sun Yat-sen University
      • Department of Biological Science
      Kao-hsiung-shih, Kaohsiung, Taiwan
  • 2007–2010
    • Chang Gung University
      Hsin-chu-hsien, Taiwan, Taiwan