Although some trials assessed the efficacy and safety of the α-blocker in facilitating renal and ureteral stones expulsion after extracorporeal shock wave lithotripsy (ESWL), the role of the α-blocker in facilitating upper urinary calculi expulsion after ESWL remain controversial.
To determine the efficacy and safety of the α-blocker in facilitating renal and ureteral stones expulsion after ESWL.
A literature search was carried out using the PubMed database, EMBASE and the Cochrane Library database to identify relevant studies. Two reviewers independently extracted data and assessed methodological quality. Pooled effect estimates were obtained using a fixed- and random-effects meta-analysis.
The meta-analysis included 23 RCTs, α-blocker significantly enhanced expulsion rate of upper urinary tract calculi after ESWL (P<0.00001; RR 1.21; 95% CI 1.12–1.31), significantly promoted steinstrasse expulsion (P=0.03; RR 1.25; 95% CI 1.03–1.53), significantly shortened the discharge time of upper urinary tract calculi (P=0.0001; MD -2.12; 95% CI -3.20–-1.04), significantly reduced the patient's pain VAS score (P=0.001; RR -1.0; 95% CI -1.61–-0.39). Compared with the control group, dizziness (P=0.002; RR 5.48; 95% CI 1.91–15.77), anejaculation (P=0.02; RR 12.17; 95% CI 1.61–91.99) and headache (P=0.04; RR 4.03; 95% CI 1.04–15.72) in the α-blocker group was associated with a higher incidence.
Citation: Li M, Wang Z, Yang J, Guo X, Wang T, Wang S, et al. (2015) Adjunctive Medical Therapy with α-Blocker after Extracorporeal Shock Wave Lithotripsy of Renal and Ureteral Stones: A Meta-Analysis. PLoS ONE 10(4): e0122497. https://doi.org/10.1371/journal.pone.0122497
Academic Editor: Xin Gao, Sun Yat-sen University, CHINA
Received: July 14, 2014; Accepted: February 22, 2015; Published: April 10, 2015
Copyright: © 2015 Li et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Data Availability: All relevant data are within the paper.
Funding: The authors have no support or funding to report.
Competing interests: The authors have declared that no competing interests exist.
Urolithiasis has plagued human beings for thousands of years . Urolithiasis is a disease that affects 8–15% of the population of Europe and North America . Extracorporeal shock wave lithotripsy (ESWL) was introduced by Chaussy et al in the 1980s . Today, about 80% of urinary tract stones are managed with ESWL. Initially a treatment for renal and upper ureteric stones, it soon became clear that ESWL could also be used to treat stones within the middle and distal ureter . ESWL produces fragmentation of the calculi using shockwaves and facilitates calculi elimination through the excretory pathway, is currently the initial treatment of choice for uncomplicated stones located in the upper urinary tract . Success rates of ESWL depend on the type of lithotripter used, stones size and location . In recent years, new treatments have been developed aiming to further improve the success rate after ESWL. Medical expulsion therapy, which includes α-blocker, and conventional analgesic and anti-inflammatory drugs, has shown promise in accelerating the spontaneous clearance of urinary stones as well as adjunctive treatment after ESWL for urinary stone .
More recent studies evaluated effect of α-blocker after ESWL on urinary stones clearance, but the evidence for their effectiveness in assisting stones clearance remained conflicting. A meta-analysis combining the studies reported to date would provide information about effect of α-blocker. The direction and magnitude of this effect will help in guiding decisions about clinical practice.
The literature search was undertaken according to the guidelines of the Centre for Reviews and Dissemination and Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) statement . An extensive PubMed, EMBASE, and The Cochrane Library search was performed including the following terms: α-blocker (or α-adrenergic antagonist, or α receptor antagonist, or tamsulosin, or doxazosin, or alfuzosin, or terazosin), and SWL (or ESWL, or shock wave lithotripsy, or shockwave lithotripsy, or ultrasonic lithotripsy, or lithotripter). We considered all publications in any language published before February 28, 2014.
The studies that met the following criteria were included: (1) RCTs; (2) patients with renal and/or ureteric calculi who were treated with ESWL; (3) α-blocker as an intervention compared with placebo or a control group; (4) Outcome measures that should be reported were clearance rate or pain (VAS) or expulsion time. Exclusion criteria were: trials in which combined intervention of α-blocker with other proven spasmolytics (e.g. corticosteroids, calcium channel blockers and phloroglucinol) were applied.
Data abstraction and quality assessment
The abstraction of data was conducted by two independent investigators. Discrepancies were resolved by discussion and simultaneous reference to the relevant literatures. The methodological quality of the included trials was evaluated using the Jadad quality scale : (1) randomization (the study was described as randomized); (2) double blinding (participant masking and researcher masking); (3) reporting of the number of dropouts and reasons for withdrawal; (4) allocation concealment; (5) generation of random numbers (by using computer, random numbers table, shuffled cards, or tossed coins). RCTs scored 1 point for each area addressed in the study design for a possible score between 0 and 5 (highest level of quality). The quality of all included studies was assessed by two investigators and the articles were classified as high-quality if their Jadad score ≥4 and low quality if their Jadad score ≤3. Disagreements regarding methodological quality were resolved with discussion between reviewers.
Meta-analyses and forest plots were carried out by the use of Review Manager version 5.3 software. RR and 95% CI were calculated for the expulsion rate of stones and incidence of side effects during treatment. Weighted mean differences and 95% CI were for expulsion time and Pain. Heterogeneity was assessed using the I-square test. When heterogeneity was present (I-square >25%) the data was analyzed using the random-effects model, otherwise a fixed-effect was used. For all studies analyzed, a P-value of less than 0.05 was considered statistically significant. Publication bias was explored via a funnel-plot analysis. The Begg rank correlation and Egger weighted regression test methods were also used to statistically assess publication bias by Stata 12.0 (P<0.05 was consider as indicative of statistically significant publication bias). In case of heterogeneity, subgroup analysis was conducted according to dosage of drug, different stone size and location.
Study selection and characteristics
Our search strategy identified 236 studies, through an abstract review we excluded all references related to other topics, editorials, alternate study designs (ie observational studies), duplicate references, reviews and review articles, of which 24 were potentially relevant trials (Fig 1). One  was excluded for combined intervention of α-blocker with phloroglucinol (spasmolytic drug) resulting in a total of 23 RCTs [11–33] which met study criteria. The characteristics and results of the 23 included studies are summarized in Table 1.
The mean Jadad score of these 23 studies was 3.2, ranging from 1 to 5 points (Table 2). 8 of 23 RCTs met the Jadad criteria for high quality , , , -, , , . All of the studies included suggested randomization, and 14 studies reported the method of random sequences generation , -, , , -, . Double blinded method were used only in four studies , , , , we considered that the outcomes and their measurements may likely to be influenced by lack of blinding. In general, the methodological and report qualities of the included studies were good, but still not very ideal.
The expulsion rate of α-blocker for stones.
The expulsion rate was analyzed in 22 of the 23 studies. The expulsion rate of the α-blocker group was significant higher than that of the control group (P<0.00001; RR 1.21; 95% CI 1.12–1.31) (Fig 2). The expulsion rate of the tamsulosin 0.4mg group was analyzed in 16 of the 23 studies. The expulsion rate of the tamsulosin 0.4mg group was significant higher than that of the control group (P<0.00001; RR 1.28; 95% CI 1.16–1.42) (Fig 3), there was no significant difference in the expulsion rate between tamsulosin 0.2mg group and control group (P = 0.57; RR 1.09; 95% CI: 0.81–1.47) (Fig 3). The expulsion rate of the α-blocker group was significant higher than that of the control group both for renal stones (P<0.0001; RR 1.34; 95% CI 1.16–1.55) and ureteral stones (P = 0.002; RR 1.20; 95% CI 1.07–1.35) (Fig 4). The expulsion rate of the α-blocker group was significant higher than that of the control group both for lower ureteral stones (P = 0.008; RR 1.29; 95% CI 1.07–1.56) and upper ureteral stones (P = 0.005; RR 1.14; 95% CI: 1.04–1.25) (Fig 5). The expulsion rate of the α-blocker group was higher than that of the control group for 4–10 mm stones (P = 0.01; RR 1.10; 95% CI: 1.02–1.19), 10–20 mm stones (P<0.00001; RR 1.76; 95% CI: 1.47–2.10) and 10–30 mm stone (P = 0.006; RR 1.55; 95% CI: 1.14–2.12) (Fig 6). The expulsion rate of the α-blocker group was significant higher than that of the control group for steinstrasse (Fig 7) (P = 0.03; RR 1.25; 95% CI: 1.03–1.53).
The expulsion time of the α-blocker for stones.
The expulsion time of the α-blocker group was analysed in 12 of the 23 studies. The expulsion time of the α-blocker group was significant shorter than that of the control group for renal and ureteral stones (P = 0.0001; MD -2.12; 95% CI -3.20–-1.04) (Fig 8). The expulsion time of the tamsulosin 0.4mg group was analysed in 9 of the 23 studies. The expulsion time of the tamsulosin 0.4mg group was significant shorter than that of the control group (P<0.00001; MD -2.46; 95% CI -3.46–-1.46) (Fig 8). The expulsion time of the α-blocker group was significant shorter than that of the control group for ureteral stones (P = 0.002; MD -1.90; 95% CI -3.09–-0.72) (Fig 9). There was no significant difference in the expulsion time between α-blocker group and control group both for upper ureteral stones (P = 0.38; MD -2.13 95% CI -6.87–2.62) and lower ureteral stones (P = 0.26; MD -1.23; 95% CI -3.36–0.89) (Fig 9).
The difference in VAS (visual analogue scale, VAS) score between the α-blocker group and control group showed statistical significance (P = 0.001; MD -1.0; 95% CI -1.61–-0.39) (Fig 10).
Proportion of patients with renal or ureteral colic of the α-blocker group was significant less than that of control group during treatment (P<0.00001; RR 0.3; 95% CI 0.22–0.40) (Fig 10).
Incidence of side effects during treatment.
The frequencies of any adverse event are shown in Fig 11, compared with the control group, dizziness (P = 0.002; RR 5.48; 95% CI 1.91–15.77), anejaculation (P = 0.02; RR 12.17; 95% CI 1.61–91.99) and headache (P = 0.04; RR 4.03; 95% CI 1.04–15.72) in the α-blocker group was associated with a higher incidence.
Publication bias analysis
The distribution of the studies using traditional funnel plot (Fig 12) showed asymmetrical distribution of effect estimate, which suggested the possibility of publication bias. Egger weighted regression analysis (p = 0.027) also showed presence of publication bias. But the Begg rank correlation statistic (p = 0.428) showed no evidence of publication bias.
This meta-analysis suggested that α-blocker significantly enchanced the expulsion rate of upper urinary tract calculi and steinstrasse, shortened stones expulsion time, reduced the pain of patients. Side effects of α- blocker was light and few.
This meta-analysis included 23 RCTs -, with 979 patients in experimental group, 933 patients in control group. Heterogeneity existed in expulsion rate of upper urinary tract calculi, the reason for heterogeneity might relate to ESWL energy and frequency, the location and the size of the stones. When separately analyzed ureter calculi, renal stones, 4–10 mm stones, we did not observe heterogeneity.
We observed a significant improvement in the success rates for the adjuvant use of α-blockers for ureteral stones, upper and lower ureteral stones, renal stones, 4–10 mm stones, 10–20 mm stones, 10–30mm stones. α-blocker could significantly promote steinstrasse discharge. A previous meta-analysis  excluded steinstrasse, our meta-analysis for the first time showed that α-blockers could significantly promoted steinstrasse discharge.
Our meta-analysis from studies suggested that α-blockers could significantly shorten the discharge time of upper urinary tract stones and ureteral stones, but there was heterogeneity among these studies. The reason for heterogeneity might relate to difference of drug treatment time, ESWL energy and frequency, the location and the size of the stones. α-blocker shorten upper and lower ureteral stones discharge time, but without statistical significance, which might be related to the size and location of the stones.
Tamsulosin was used as adjuvant therapy in 20 studies, of which 18 was tamsulosin 0.4mg -, -, -, -, -, , of which 2 was tamsulosin 0.2mg, one of which was from Japan , another of which was from South Korea . Tamsulosin 0.4 mg significantly promoted the discharge of upper urinary tract stones, significantly shorten the discharge time of stones. However, tamsulosin 0.2 mg could not significantly promote the ureteral stones expulsion, however, the result only from two studies, this need a large number of clinical trials to confirm.
α-blockers can significantly reduce the patient's pain and the proportion of patients with renal colic. In some studies, a total VAS score was 100points, in some studies, a total VAS score was 10 points, in order to facilitate statistical analysis, we took 100 points as the total score of data conversion into total score of 10 points data.
Side effect of α-blockers was light and few, the common side effects were headache, dizziness, majority of which was mild dizziness, anejaculation. In the treatment group, one patient experienced delay ejaculation, one patient experienced abnormal ejaculation, one patient experienced retrograde ejaculation, one patient experienced postural hypotension, two patients experienced diarrhea, four patients experienced rhinitis. With regarding to nausea with or without vomiting, four patients experienced in the treatment group, five patients experienced in control group.
The characteristic of this meta-analysis was statistically analyzed the effect of α-blockers on steinstrasse and on different location and size stones.
The shortcoming of this meta-analysis was that there were heterogeneities among studies. The heterogeneities might relate to different duration of treatment, different stone size and location, different ESWL energy and frequency among studies. Most of the included trials failed to describe detail information about randomization and allocation concealment. Lack of blinding procedures in RCTs can also exaggerate the conclusions of these trials. In addition, publication bias should also not be ignored because both the funnel plot and Egger’s test showed the possibility of publication bias, even though the Begg’s test showed no evidence of publication bias. Further assessment of α-blockers needs to be taken by large-scale clinical studies which employ rigorous methodologies. So the results need to be interpreted cautiously. But on the whole, to some extent, the results of this meta-analysis will help clinicians to make some right clinical decisions. As more and more clinical trials take, conclusions will be more credible.
Conceived and designed the experiments: CPY JHL XLG ZQY. Performed the experiments: MCL TW JY. Analyzed the data: MCL TW SGW. Contributed reagents/materials/analysis tools: MCL TW ZYW. Wrote the paper: MCL ZYW.
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