To analyze whether C-reactive protein (CRP) predicts the need for urgent urinary diversion in patients with renal colic and urolithiasis. CRP may help in the differential diagnosis of complicated hydronephrosis.
Prospective study done on 110 consecutive patients with renal colic secondary to upper urinary tract calculi admitted in the emergency room. Clinical and analytical data were collected. Criteria for emergency drainage had been established in advance, based on the risk of sepsis, renal failure, persistence of pain, and findings on computed tomography scan. CRP was blindly determined using immunoturbidimetric assay on the Integra 700 analyzer. Statistical analysis included Mann-Whitney test, Cox multivariate analysis, and receiver operating characteristic curves, to determine optimum cut-off points to decide drainage based on laboratory data.
Mean CRP value was 47.6 mg/L (CI, 31.4-63.8), 139.6 mg/L (CI, 13-183.1) in 29 patients treated with diversion and 14.67 mg/L (CI, 6.7-22.5) in the control group (P <.001). Age, sex, rate of patients with hypertension, history of cardiovascular disease, leukocyte total count, and serum creatinine differed between groups (P <.05). Regression analysis revealed CRP (P <.0001) and age (P = .0001) were predictive of urinary diversion. Receiver operating characteristic analysis revealed 68.4% area under the curve for creatinine, 68.8% for leukocytosis, and 86.8% for CRP. A cut-off point for CRP of 28 mg/L achieved optimum sensitivity (75.8%) and specificity (88.9%) for determining the decision for drainage.
Determination of CRP in patients with renal colic due to urolithiasis provides an objective and useful parameter for deciding placement of urinary stent, which is even more valuable than leukocytosis or seric creatinine level.
"Yoshimura et al.  reported that age, gender, and performance status were associated as risk factors for emergency drainage in patients with upper urinary tract calculi. In another study, age and a high CRP level were associated as useful parameters for deciding upon emergency drainage in patients with renal colic due to upper urinary tract calculi . Regarding surgical decompression, Mokhmalji et al.  reported that percutaneous nephrostomy might be superior to ureteral stents for the diversion of hydronephrosis due to urinary calculi. "
[Show abstract][Hide abstract] ABSTRACT: Acute pyelonephritis (APN) with obstructive uropathy is not uncommon and often causes serious conditions including sepsis and septic shock. We assessed the risk factors for septic shock in patients with obstructive APN associated with upper urinary tract calculi.
We retrospectively studied 69 patients with obstructive APN associated with upper urinary tract calculi who were admitted to our hospital. Emergency drainage for decompression of the renal collecting system was performed for empirical treatment in cases of failure of initial treatment and for severe cases. We assessed the risk factors for septic shock by multivariate logistic regression analysis.
Overall, 45 patients (65.2 %) underwent emergency drainage and 23 (33.3 %) patients showed septic shock. Poor performance status and the presence of diabetes mellitus (DM) in the septic shock group were more common than in the non-septic shock group (p = 0.012 and p = 0.011, respectively). The platelet count and serum albumin level in the septic shock group were significantly lower than in the non-septic shock group (p = 0.002 and p = 0.003, respectively). Positive rates of midstream urine culture and blood culture in the septic shock group were significantly higher than in the non-septic shock group (p = 0.022 and p = 0.001, respectively). Multivariate analysis showed that decreases in the platelet count (OR 5.43, p = 0.014) and serum albumin level (OR 5.88, p = 0.023) were independent risk factors for septic shock.
Patients with obstructive APN associated with upper urinary tract calculi who have decreases in platelet count and serum albumin level should be treated with caution against the development of septic shock.
World Journal of Urology 09/2013; 32(3). DOI:10.1007/s00345-013-1166-4 · 2.67 Impact Factor
"Inflammatory responses in the proximal part of the ureter due to a ureteral stone may increase serum CRP levels, and indirect identification of the degree of inflammation may be used to predict the spontaneous passage rate and thus may be helpful in treatment selection. In a prospective study of ureteral stone patients with colicky pain, Angulo et al.  noted that in consideration of sensitivity and specificity, serum CRP levels of 2.8 mg/dL were the standard for initiating aggressive treatment. In the present study as well, when CRP levels were less than 0.4.9 mg/dL, ureteral stone removal rates were high, which suggests that conservative management may be preferred when CRP levels are low. "
[Show abstract][Hide abstract] ABSTRACT: A ureter obstruction caused by a ureteral stone results in inflammatory changes in the proximal submucosal layer and prevents the spontaneous passage of the ureteral stone. Accordingly, we analyzed the relationship between the spontaneous passage rates of ureteral stones less than 8 mm in size and serum C-reactive protein (CRP) levels and neutrophil percentages.
A total of 187 patients who were diagnosed with ureteral stones less than 8 mm in size and were managed consecutively at Keimyung University Dongsan Medical Center from January 2001 to January 2011 were retrospectively analyzed. Ureteral stone removal was defined as no ureteral stone shown in an imaging test without any treatment for 8 weeks after diagnosis. The patients were divided into three groups according to the levels of serum CRP and into two groups according to neutrophil percentage. The associations between these factors and ureteral stone passage rates were then examined.
The ureteral stone passage rates of the low serum CRP level group, the medium serum CRP level group, and the high serum CRP level group were 94.1% (159/169), 70% (7/10), and 50.0% (4/8), respectively. The passage rates of ureteral stones in the group with a normal neutrophil percentage and in the group with a higher neutrophil percentage were 94.5% (121/128) and 83.1% (49/59), respectively (p=0.011).
Measuring serum CRP levels and neutrophil percentages in patients with small ureteral stones of less than 8 mm is useful in predicting whether the stone will be spontaneously passed. When the serum CRP level and neutrophil percentage of a patient are high, aggressive treatment such as extracorporeal shock wave lithotripsy should be considered.
Korean journal of urology 09/2013; 54(9):615-8. DOI:10.4111/kju.2013.54.9.615
"Performance status, age, and sex were reported to be independent risk factors for emergency drainage to treat APN with upper urinary tract calculi . In another study, a high CRP level and old age were found to be independent predictors of the need for urinary diversion, and CRP was shown to be an objective and useful parameter for the selection of stenting in patients with renal colic . Our study revealed that poor performance status was a significant risk factor for septic shock associated with upper urinary tract calculi. "
[Show abstract][Hide abstract] ABSTRACT: Acute pyelonephritis (APN) is a common complication of ureteral obstruction caused by urolithiasis, and it can be lethal if it progresses to septic shock. We investigated the clinical characteristics of patients undergoing emergency drainage and assessed risk factors for septic shock.
A retrospective study was performed of 98 patients (101 events) requiring emergency drainage at our urology department for obstructive APN associated with upper urinary tract calculi from January 2003 to January 2011. Clinical characteristics were summarized, and risk factors for septic shock were assessed by logistic regression analysis.
Objective evidence of sepsis was found in 64 (63.4%) events, and 21 events (20.8%) were categorized as septic shock. Ninety-six patients recovered, but 2 patients died of septic shock. Multivariate analysis revealed that age and the presence of paralysis were independent risk factors for septic shock.
APN associated with upper urinary tract calculi is a severe disease that should be treated with caution, particularly when risk factors are present.
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