J Clin Med Res
Journal of Clinical Medicine Research, ISSN 1918-3003 print, 1918-3011 online, Open Access
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Original Article

Volume 11, Number 3, March 2019, pages 208-212


A Retrospective Study of Kidney Stone Recurrence in Adults

Jianfeng Zenga, Shanyun Wangb, Liang Zhonga, Zhifeng Huanga, Ye Zenga, Dongxiang Zhenga, Weiwei Zouc, Haibiao Laia, d

aDepartment of Urology Surgery, Zhongshan Hospital of Traditional Chinese Medicine Affiliated With Guangzhou University of Chinese Medicine, Zhongshan City, China
bDepartment of Obstetrics and Gynecology, Zhongshan Hospital of Traditional Chinese Medicine Affiliated With Guangzhou University of Chinese Medicine, Zhongshan City, China
cDepartment of Anesthesiology, Zhongshan Torch Development Zone Hospital, Zhongshan City, China
dCorresponding Author: Haibiao Lai, Department of Urology Surgery, Zhongshan Hospital of Traditional Chinese Medicine Affiliated With Guangzhou University of Chinese Medicine, 3 Kangxin Road, Western District, Zhongshan City 528400, Guangdong Province, China

Manuscript submitted December 27, 2018, accepted January 24, 2019
Short title: Kidney Stone Recurrence
doi: https://doi.org/10.14740/jocmr3753

Abstract▴Top 

Background: Nephrolithiasis or kidney stone disease (KSD) is a common disorder worldwide. Despite the availability of a variety of effective management strategies, KSD recurrence remains a problem. In the present study, we investigated the KSD recurrence after the treatment of the first stone episode.

Methods: Medical records of all patients who had KDS treated in our department from January 2012 to January 2016 were retrospectively reviewed. A total of 146 patients who had KDS recurrence were identified. The demographic information, biochemical data, treatment methods, report of hydronephrosis severity and stone chemical compositions were collected and analyzed.

Results: We reported that: 1) Sixty four (43.8%) out of 146 patients with stone recurrence were overweight or obese; 2) Of all 146 patients with stone recurrence, 86 (58.9%) had hyperlipidemia, 77 (52.4%) had hyperuricemia and 64 (43.8%) had hyperglycemia; 3) Mini-invasive methods were mostly used for the treatment of the first stone episode; 4) The most chief complaint differed during the first episode and recurrence; 5) The number of patients who had grades 3 and 4 hydronephrosis was significantly lower during recurrence compared with that in the first stone episode; 6) Seventy nine (54.1%) patients with recurrence had stone of calcium oxalate.

Conclusions: Majority of patients with KSD recurrence have overweight/obesity, hyperlipidemia, hyperuricemia and hyperglycemia, indicating a role of metabolic disorders in stone recurrence. Mini-invasive methods are the mainstay for the management of the first stone episode. The degree of hydronephrosis is significantly reduced during stone recurrence, possibly due to increased awareness of the disease and thereafter the change of lifestyle in patients. Over half of recurrent stones are of calcium oxalate.

Keywords: Kidney stone disease; Recurrence; Metabolic disorders; Renal colic; Hydronephrosis; Calcium oxalate

Introduction▴Top 

Nephrolithiasis or kidney stone disease (KSD) is a common disorder estimated to affect approximately 10-12% of men and 5-6% of women in Western countries [1, 2]. In a cross-sectional study, Zeng et al investigated 12,570 individuals during 2013 and 2014, and revealed a prevalence rate of 6.4% in Chinese population [3]. KDS negatively impacts kidney function, which can result in chronic kidney disease and end-stage renal failure; it is also associated with increased risk of myocardial infarction, peripheral arterial disease and hypertension, leading to substantial financial loss resulting from lost work days and health-care costs [4-10]. Due to lifestyle changes such as lack of physical activity and dietary habits, and global warming, the incidence of KSD has been increasing worldwide in the past decades [1, 2, 11-18]. Genetic factors involving in the pathogenesis of kidney stones have also been recognized [19-22].

There are a variety of treatment options for KSD including open surgery, percutaneous nephrolithotomy, super-mini percutaneous nephrolithotomy, ureteroscopy, extracorporeal shock wave lithotripsy and conservative intervention/measures [23-28]. Despite satisfactory outcomes after intervention, the recurrence of KSD is dismally high [29-31]. A recent systematic review has shown that the prevalence rate of KSD in the south region of China is markedly higher than that in the north region [11]. In this study, we aimed to explore the recurrence of KSD in patients who were treated in our hospital that is located in South China.

Patients and Methods▴Top 

Patients

This study was approved by the Medical Research Review Committee of Zhongshan Hospital of Traditional Chinese Medicine. The requirement for informed consent was waived due to the retrospective nature of current study. Medical records of all patients who had KDS treated in our department from January 2012 to January 2016 were retrospectively reviewed. A total of 146 patients who had KDS recurrence after treatment of first stone episode were identified. The demographic information, biochemical data, treatment methods, severity of hydronephrosis report and stone chemical composition, were collected and analyzed.

Biochemical testing and analysis of stone composition

Blood cholesterol, uric acid and fasting glucose levels were detected routinely in our diagnostic laboratory. Stone chemical composition was analyzed using an automatic infrared spectrometer (Blue Maude Scientific Instrument Co., Ltd., Tianjin, China).

Assessment of severity of hydronephrosis

An alternative grading system was used to assess the severity of hydronephrosis [32]. Grade 0 (normal) suggests no hydronephrosis; grade 1 is defined as having dilatation of renal pelvis alone; grade 2 has dilatation of renal pelvis plus caliceal dilatation; grades 1 and 2 indicate mild hydronephrosis; grade 3 means moderate hydronephrosis where < 1/2 renal parenchymal loss is seen; and grade 4 is severe hydronephrosis, which has > 1/2 renal parenchymal loss.

Statistical analysis

Data normality was assessed by the Shapiro-Wilk test. Normally distributed continuous variables were presented as mean ± standard deviation (SD) and tested by Student’s t-test. Categorical variables were presented by numbers (percentages) and tested by Chi-square test. P < 0.05 was considered statistically significant.

Results▴Top 

A total of 3,985 patients had KSD treated in our department from January 2012 to January 2016. Of these patients, 146 (3.7%) including 100 males and 46 females had stone recurrence. The mean age of male patients was 39.4 ± 15.8 years, which was not significantly different than 41.5 ± 18.5 years of female patients. The distribution of the body mass index (BMI) of these 146 patients is shown in Figure 1. According to the criteria set for Chinese population, i.e., a BMI ≥ 24 kg/m2 is regarded as overweight or obesity [33], 64 (43.8%) patients are overweight or obese. Among these 146 patients, 86 had hyperlipidemia, 77 had hyperuricemia and 64 had hyperglycemia. The most-used procedure for the management of the first stone episode was percutaneous nephrolithotomy (65 cases) followed by conservative treatment (34 cases), extracorporeal shock wave lithotripsy (22 cases), super-mini percutaneous nephrolithotomy (20 cases), open surgery (four cases) and ureteroscopy (one case).

Figure 1.
Click for large image
Figure 1. Distribution of body mass index of patients with recurrent KDS. As shown in this figure, 64 patients had an abnormally high body mass index (BMI).

During the first stone episode the most chief complaint was renal colic (Fig. 2a), and in contrast, the most chief complaint for patients with recurrence was the symptom associated with infection (Fig. 2b). We compared the severity of hydronephrosis during the first stone episode and recurrence in those 146 patients, and found that the number of patients who had grades 3 and 4 hydronephrosis was significantly lower during recurrence compared with that during the first stone episode (Table 1). Chemical composition analysis showed that most recurrent stones were of calcium oxalate followed by calcium oxalate plus hydroxyapatite, calcium oxalate plus magnesium ammonium phosphate and uric acid plus calcium oxalate (Table 2).

Figure 2.
Click for large image
Figure 2. Chief complaint during the first stone episode and recurrence. As shown in this figure, the most chief complaint was renal colic for patients with first stone episode (a). In contrast, the most chief complaint for patients during recurrence was the symptom associated with infection (b).

Table 1.
Click to view
Table 1. Number of Patients Who Had Different Grades of Hydronephrosis in the First Stone Episode and Recurrence
 

Table 2.
Click to view
Table 2. Stone Composition in Recurrent KSD
 
Discussion▴Top 

In this study, we retrospectively reviewed medical records and identified 146 cases of stone recurrence in a total of 3,985 patients from January 2012 to January 2016. We reported that: 1) Sixty four (43.8%) out of 146 patients with stone recurrence were overweight or obese; 2) Of all 146 patients with stone recurrence, 86 (58.9%) had hyperlipidemia, 77 (52.4%) had hyperuricemia and 64 (43.8%) had hyperglycemia; 3) Mini-invasive methods were mostly used for the treatment of the first stone episode; 4) The most chief complaint differed during the first episode and recurrence; 5) The number of patients who had grades 3 and 4 hydronephrosis was significantly lower during recurrence compared with that during the first stone episode; 6) Seventy nine (54.1%) patients with recurrence had stone of calcium oxalate.

Varied recurrence rates of KSD have been reported from study to study but are dismally high. In a retrospective study, Rule et al observed that KSD recurrence rates at 2, 5, 10, and 15 years were 11%, 20%, 31%, and 39%, respectively [30]. By following up of 300 consecutive patients for 7 to 17 years, Trinchieri et al reported a 27% symptomatic stone recurrence [34]. Vaughan et al looked at a random sample of incident symptomatic kidney stone formers consisting of 3,364 patients, and found that the stone recurrence rates per 100 person-years were 3.4 after the first episode, 7.1 after the second episode, 12.1 after the third episode, and 17.6 after the fourth or higher episode [35]. Our observational period ranges from 2 - 6 years, but the data on the number of episodes for each individual are not available, making it difficult to compare our results with Vaughan’s. Nevertheless, a recurrence rate of 3.7% observed by us is low, which probably is due to the education we provided that increased patients’ awareness of dietary role in the prevention of KSD recurrence and thereafter the change of lifestyle.

In 146 patients who had KSD recurrence, 100 (68.5%) are males, which is in line with the finding that KSD occurs more frequently in men than in women [11, 36, 37]. Obesity has been found associated positively with KSD. Taylor et al revealed that the risk factor for KSD for men with a BMI of 30 or greater versus those with a BMI of 21 to 22.9 was 1.33, and the risk factor for the same categories of BMI in older and younger women was 1.90 [16]. Increased BMI as a risk factor for kidney stones has also been demonstrated by others [38, 39]. In our series, 43.8% patients had abnormally high BMI, supporting the notion that BMI is a risk factor for KSD. The links between metabolic syndrome and KSD has been established [40]. Diabetic patients have a higher risk of suffering from KSD [14]. In our series, 43.8% of patients had hyperglycemia. Additionally, half patients had hyperuricemia and approximately 60% of patients had hyperlipidemia. These findings suggest that control of metabolic disorders might be pivotal for the prevention of KSD recurrence.

In our practice, we recommend patients change diet, do more exercise, lose weight and take more fluids, which might contribute to the low recurrence rate observed in this study. This is a retrospective study and the inherent bias might overestimate the results. Additionally, the sample size is small, which might limit the generalizability of our findings. These are the limitations of this study.

Conclusions

In conclusion, the majority of patients with KSD recurrence have overweight/obesity, hyperlipidemia, hyperuricemia and hyperglycemia, indicating a role of metabolic disorders in stone recurrence. These data suggest that life style modification and dietary intervention are important in the prevention of KSD recurrence. Mini-invasive methods are the mainstay for the management of the first stone episode. The degree of hydronephrosis is significantly reduced during stone recurrence, possibly due to increased awareness of the disease and thereafter the change of lifestyle in patients. Over half of recurrent stones are of calcium oxalate.

Funding Disclosure

There is no funding received for this study.

Conflict of Interest

None.


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