One-Year Mortality of Acute Kidney Injury in Patients with Acute Myocardial Infarction / 대한신장학회지

PURPOSE: Acute kidney injury (AKI) is a common complication during hospitalization and is an accepted risk factor for in-hospital mortality. However, the association of severity of AKI with the long-term risk of death is not well known. This study aimed to investigate the incidence and clinical significance of AKI in patients with acute myocardial infarction (AMI). METHODS: To examine the effect of the severity of AKI on 1-year risk of death following AMI, we performed an observational study of 1,224 patients admitted for AMI. We evaluated the association between AKI and all-cause mortality. Patients with maintaining hemodialysis treatment (n=7), and who died during hospitalization (n=71) were excluded. Remaining 1146 patients were divided into three groups according to the Acute Kidney Injury Network (AKIN) criteria (Stage-1, -2, and-3). The primary end point of the study was 1-year all-cause mortality after hospital discharge. The relation between the severity of AKI and 1-year mortality after AMI was analyzed. RESULTS: AKI was developed in 222/1,146 (19.3%) patients during the hospital stay. Adjusted hazard ratio for 1-year mortality was 3.064 (95% CI 1.618 to 5.803, p=0.001), 6.112 (95% CI 2.344 to 15.935, p<0.001) and 20.030 (95% CI 5.428 to 73.912, p<0.001) in stage-1, -2, and stage-3 AKI groups compared with that of no AKI group. CONCLUSION: The severity of AKI is strongly related to 1-year all cause mortality in patients with AMI.

Idiopathic Retroperitoneal Fibrosis Associated with a Horseshoe Kidney / 대한신장학회지

A case of a 52-year-old man with retroperitoneal fibrosis and a horseshoe kidney is presented. Horseshoe kidney is one of the most common renal anomalies and complicated with urinary tract infection, hydronephrosis, calculi, tumor of the renal pelvis, and other multiple congenital abnormalities. Idiopathic retroperitoneal fibrosis is a rare disease characterized by the presence of a retroperitoneal tissue, consisting of chronic inflammation and marked fibrosis, which often entraps ureters or other abdominal organs. The correlation between horseshoe kidney and retroperitoneal fibrosis has not been described. We report a rare case of idiopathic retroperitoneal fibrosis with horseshoe kidney disease demonstrating good response to steroid therapy.

A Case of Bronchiolitis Interstitial Pneumonitis / 결핵및호흡기질환

Bronchiolitis interstitial pneumonitis (BIP), an unclassified and newly described interstitial pneumonia, has a combined feature of prominent bronchiolitis, interstitial inflammation, and fibrosis. It is distinct from bronchiolitis obliterans or bronchiolitis obliterans organizing pneumonia (BOOP). BIP has a better prognosis than common cases of interstitial pneumonia. However, BIP has a poorer prognosis than BOOP. BIP's response to corticosteroids is not as successful as BOOP's response to this treatment. We encountered the case of a 31-year-old woman with BIP with an initial presentation of dyspnea and a cough that had lasted for 3 months. The patient's chest CT scan demonstrated patchy ground glass opacities and multiple ill-defined centrilobular nodules in both lungs, suggesting military tuberculosis or nontuberculous mycobacterial infection. A video-assisted thoracoscopic lung biopsy resulted in the diagnosis of BIP. Clinical symptoms, pulmonary lesions, and pulmonary function tests were improved after oral glucocorticoid therapy.

Diagnostic Performance of Fractional Excretion of Urea in Evaluating Patients with Acute Kidney Injury with Diuretics Treatment / 대한신장학회지

PURPOSE:Although fractional excretion of sodium (FENa) has been used to distinguish transient-acute kidney injury (T-AKI) from persistent-AKI (P-AKI), the availability of FENa in the diagnosis of T-AKI is reported low in patients with diuretics use. We compared the diagnostic performance of fractional excretion of urea (FEUrea) with that of FENa in patients with diuretics use. METHODS:One hundred seven AKI patients were classified as having T-AKIor P-AKI according to the clinical context. Each group was again subdivided according to exposure to diuretics. According to the cut off value generated by receiver operating characteristic (ROC) curves, sensitivity and specificity of FENa and FEUrea were compared with each other. RESULTS:The numbers of patients administered with diuretics were 67 out of total 107 AKI patients (63%), 27 out of 52 (52%) of T-AKI patients, and 40 out of total (65) 55 (73%) of P-AKI patients. When the cutoff value of T-AKI was defined as FENa < or =1.5 and FEUrea < or = 30 according to the ROC curves, sensitivity and specificity of FENa were 96% and 100% in non-diuretics group, and 63% and 98% in diuretics group, respectively. Sensitivity and specificity of FEUrea were 92% and 87% in non- diuretics group, and 96% and 83% in diuretics group, respectively. CONCLUSION:FEUrea is as good as FENa at distinguishing T-AKI from P-AKI in patients administered with diuretics.

Renoprotective effect of deflazacort in IgA nephropathy with proteinuria / 대한내과학회지

BACKGROUND/AIMS: Steroid therapy is reported to improve the clinical outcome of IgA nephropathy. In addition, recent studies have revealed that deflazacort has fewer side effects than prednisolone. This study examined the effect of steroids and compared the clinical efficacy of deflazacort and prednisolone in patients with IgA nephropathy. METHODS: We retrospectively reviewed 136 patients with biopsy-proven IgA nephropathy who received deflazacort (n=50), prednisolone (n=29), or neither (n=59), and in whom blood pressure was controlled with angiotensin converting enzyme inhibitors or angiotensin receptor blockers. The mean duration of steroid administration was 9.5+/-9.1 months. The initial clinical status and change in the amount of protein in the 24-hour urine were compared among the three groups. RESULTS: The baseline characteristics (age, blood pressure, serum creatinine level, initial protein in the 24-hour urine, and creatinine clearance) did not differ significantly among the groups. The decrement of protein in the 24-hour urine was higher in the deflazacort and prednisolone groups, as compared with the control group (4.4+/-5.4, 4.2+/-1.5, and 2.1+/-3.1 g/day, respectively, p=0.013). The increment in the creatinine clearance was higher in the deflazacort and prednisolone groups, as compared with the control group (11.5+/-16.4, 12.3+/-26.2, and 4.8+/-14.91.3+/-0.9, respectively, p=0.009). There were no significant differences in the above parameters between the deflazacort and prednisolone groups. CONCLUSIONS: Steroid therapy reduces urinary protein excretion in IgA nephropathy, and the clinical efficacy of deflazacort and prednisolone was found to be similar.

Continuous renal replacement therapy for the treatment of acute kidney injury

BACKGROUND/AIMS: Continuous renal replacement therapy (CRRT) has been widely used for treating critically ill patients with acute kidney injury (AKI). Whether CRRT is better than intermittent hemodialysis for the treatment of AKI remains controversial. We sought to identify the clinical features that can predict survival for the patients who are treated with CRRT. METHODS: We analyzed the data of 125 patients who received CRRT between 2005 and 2007. We identified the demographic variables, the underlying diagnoses, the duration of CRRT, the mean arterial blood pressure (ABP) and the Simplified Acute Physiology Score (SAPS) II. The classification/staging system for acute kidney injury (AKI) was applied to all the patients, who were then divided into stage 1-3 subgroups. RESULTS: The average age of the patients was 61.414.3 years and the mortality rate was 60% (75 of 125 patients). The survivors had a significantly higher mean ABP and a higher mean serum bicarbonate level, which were measured the day after CRRT, than the nonsurvivors (86.723.7 vs. 69.224.6 mm Hg, respectively, 21.43.5 vs. 16.45.4 mmol/L, respectively,; p<0.05 for each). The stage 3 AKI patients showed the worst parameters for the SAPS II score and the serum levels of creatinine and blood urea nitrogen. The mortality rate was higher for the stage 3 subgroup than the other groups (70.5%, p<0.05). CONCLUSIONS: The patients with AKI and who require CRRT continue to have a high mortality rate. A higher mean ABP and a higher serum bicarbonate level measured the day after CRRT may predict a more favorable prognosis. The staging system for AKI can improve the ability to predict the outcomes of CRRT patients.

The Maternal and Fetal Adrenal Effect of 1 cycle Dexamethasone on women with Preterm Labor / 대한산부인과학회잡지

OBJECTIVE: The aim of this study was to determine whether 1 cycle of dexamethasone administration to women at risk of preterm delivery causes adrenal suppression METHODS: Nonpregnant ten control subjects were checked baseline cortisol and stimulated cortisol level after low-dose (1 microgram) ACTH stimulation test. Ten women at risk of preterm delivery had two weekly low-dose (1 microgram) ACTH stimulation tests with the first one at admission. Immediately after the first ACTH stimulation test, we gave each women a 5 mg dexamethasone dose intramuscularly and repeated it 12 hours later for two days. Serum cortisol levels were measured before (baseline) and 30 minutes after ACTH administration. RESULTS: All ten subjects had normal baseline and stimulated cortisol levels for the first ACTH stimulation test. The adrenal suppressed Group was composed of 5 patients. But the remainders was not suppressed. Mean baseline serum cortisol levels decreased from 38.52 microgram/dL (before dexamethasone) to 33.26 microgram/dL (1 week after 1 cycle of dexamethasone) in adrenal suppressed Group. The mean stimulated cortisol levels also decreased from 46.40 microgram/dL (before dexamethasone) to 45.02 microgram/dL (1 week after 1 cycle of dexamethasone) in adrenal suppressed Group. CONCLUSIONS: Antenatal administration of 1 cycle dexamethasone produced slightly adrenal suppression, but no adrenal insufficiency, in some women at risk of preterm delivery and may be harmless to maternal and fetal adrenal function.