Predictors and Cost Comparison of Subsequent Urinary Stone Care at Index Versus Non-Index Hospitals.

OBJECTIVE: To examine the effects of care fragmentation, or the engagement of different health care systems along the continuum of care, on patients with urinary stone disease. METHODS: All-payer data from the 2016 Healthcare Cost and Utilization Project (HCUP) State Databases from Florida (FL) and New York (NY) were used to identify a cohort of adult patients with an emergency department visit for a diagnosis of urolithiasis, who subsequently re-presented to an index or non-index hospital for renal colic and/or urological intervention. Patient demographics, regional data, and procedural information were collected and 30-day episode-based costs were calculated. Multivariable logistic and gamma generalized linear regression were utilized to identify predictors of receiving subsequent care at an index hospital and associated costs, respectively. RESULTS: Of the 33,863 patients who experienced a subsequent encounter related to nephrolithiasis, 9593 (28.3%) received care at a non-index hospital. Receiving subsequent care at the index hospital was associated with fewer acute care encounters prior to surgery (2.5 vs 2.7; P <.001) and less days to surgery (29 vs 42; P < .001). Total episode-based costs were higher in the non-index setting, with a mean difference of $783 (Non-index: $13,672, 95% CI $13,292-$14,053; Index: $12,889, 95% CI $12,677 - $13,102; P < .001). CONCLUSION: Re-presentation to a unique healthcare facility following an initial diagnosis of urolithiasis is associated with a greater number of episode-related health encounters, longer time to definitive surgery, and increased costs.

Contemporary Assessment of the Economic Burden of Upper Urinary Tract Stone Disease in the United States: Analysis of One-Year Health Care Costs, 2011-2018.

Background: The U.S. health care landscape has witnessed numerous changes since implementation of the Affordable Care Act coupled with rising prevalence of upper urinary tract stone disease (SD). Data on the economic burden of SD during this period are lacking, providing the objective of our study. Materials and Methods: Adults diagnosed as having SD from 2011 to 2018 were identified from PearlDiver Mariner, a national all-payer database reporting reimbursements and prescription costs for all health care encounters. Patients undergoing operative and nonoperative care were identified. Time trends in annual expenditures were evaluated. Multivariable analysis evaluated determinants of spending. Results: A total of $10 billion were spent on SD management between 2011 and 2018 (median overall annual expenditure = $1.4 billion) among 786,756 patients. Inpatient, prescription, and outpatient costs accounted for 34.7%, 20.7%, and 44.6% of expenditures, respectively. Seventy-eight percent of patients were managed nonoperatively (total cost = $6.9 billion). The average overall cost per encounter was $13,587 ($17,102 for surgical vs $11,174 for nonsurgical care). Expenditures on inpatient care decreased significantly over time, while expenditures on prescriptions and outpatient care increased significantly. On multivariable analysis, a higher Charlson Comorbidity Index (CCI) was associated with higher spending, while associations for age, insurance, and region varied by treatment modality. Conclusions: The economic burden of SD management is substantial, dominated by expenditure on nonoperative management and outpatient care. Expenditures for prescription and outpatient care are rising, with the only consistent predictor of higher spending being CCI. Spending variation according to demographic, clinical, and geographic factors was evident.

Qualitative Assessment of Medical Information on YouTube: A Multilingual Comparison of Common Urological Conditions.

INTRODUCTION: Patients nowadays often search video-sharing platforms for online patient education materials. Since previous assessments of urological videos were limited to English, we systematically assessed the quality of videos on treatment of benign prostatic hyperplasia (BPH), prostate cancer (PCa), and urinary stone disease (USD) in 4 different languages on YouTube using validated instruments. METHODS: The search for videos on YouTube addressing treatment options of BPH, PCa, and USD was performed in October 2020 in -English, French, German, and Italian. Assessed parameters included basic data (e.g., number of views), grade of misinformation, and reporting of conflicts of interest. Quality of content was analyzed using the validated DISCERN questionnaire. Data were analyzed using descriptive statistics. RESULTS: A total of 240 videos (60 videos in each language) were analyzed. Videos on USD in English had the highest number of views (median views 271,878 [65,313-2,513,007]). The median overall quality of videos assessed showed a moderate quality (2.5-3.4 points out of 5 points for DISCERN item 16). Median total DISCERN score of all videos divided by language showed very similar results: English (39.75 points), French (38 points), German (39.5 points), and Italian (39 points). Comparing the different diseases, videos about BPH showed the highest median scores, especially in German language (median score 43.25 points). CONCLUSIONS: Videos concerning the treatment of BPH, PCa, and USD have a low to moderate quality of content, with no differences seen between the languages assessed. These findings further support the notion of improved patient information materials on video platforms such as YouTube.

Extracorporeal shock wave lithotripsy versus ureteroscopy for management of pediatric nephrolithiasis in upper urinary tract stones: multi-institutional outcomes of efficacy and morbidity.

INTRODUCTION: As the incidence of pediatric nephrolithiasis rises, understanding the efficacy and morbidity of surgical treatment options is critical. Currently, there are limited comparative data assessing shock wave lithotripsy (SWL) and ureteroscopy (URS) outcomes in children. OBJECTIVE: The objective of this study was to compare stone clearance, 30-day emergency department visits, and the number of general anesthetics required per stone treatment for both modalities. STUDY DESIGN: A multi-institutional retrospective review of children presenting for either URS or SWL between 2000 and 2017 was performed. Stone clearance, need for retreatment, the number of anesthetics, as well as the number and reason for emergency room visit were captured and compared between groups. Multivariate statistical analysis accounting for age, stone location, stone diameter, pre-intervention stent, and provider volume was performed for adjusted analysis. RESULTS: A total of 84 SWL and 175 URS procedures were included. Complete stone clearance and rates of residual stone fragments <4 mm after final procedure for SWL were 77.0% and 90.8% and for URS were 78.5% and 91.7%, respectively. Retreatment rates for both procedures were not significantly different (17.9% SWL vs. 18.9% URS, P = 0.85). Children who underwent SWL had lower rates of emergency room visits for infections (0% vs. 5.1%, P = 0.03) and flank pain (3.6% vs. 10.9%, P = 0.05) and required fewer general anesthetics per treatment (1.2 vs. 2.0, P < 0.01) than those who underwent URS (Figure). DISCUSSION: Stone clearance after both the initial and final treatments and need for repeat interventions were similar between surgical modalities. However, SWL carries less morbidity than URS. Specifically, patients who underwent SWL experienced lower rates of ED visits for urinary tract infection and for flank pain, parallel to conclusions in current comparative literature. In addition, SWL requires less general anesthetics (2.0 vs. 1.2), secondary to lower rates of ureteral stent placement and removal. Data on the potential risk of general anesthetics to neurodevelopment support thoughtful utilization of these medications. Limitations of this study include its retrospective nature and the prolonged 20-year time period over which data were collected. CONCLUSIONS: When adjusting for confounders, SWL and URS achieve similar stone clearance. In the setting of equivalent efficacy, considerations regarding necessity of repeat interventions, morbidity of anesthesia, and complications should be integrated into clinical practice.

Payer Type, Race/Ethnicity, and the Timing of Surgical Management of Urinary Stone Disease.

PURPOSE: Surgery for upper tract urinary stone disease is often reserved for symptomatic patients and those whose stone does not spontaneously pass after a trial of passage. Our objective was to determine whether payer type or race/ethnicity is associated with the timeliness of kidney stone surgery. MATERIALS AND METHODS: A population-based cohort study was conducted using the California Office of Statewide Health Planning and Development dataset from 2010 to 2012. We identified patients who were discharged from an emergency department (ED) with a stone diagnosis and who subsequently underwent a stone surgery. Primary outcome was time from ED discharge to urinary stone surgery in days. Secondary outcomes included potential harms resulting from delayed stone surgery. RESULTS: Over the study period, 15,193 patients met the inclusion criteria. Median time from ED discharge to stone surgery was 28 days. On multivariable analysis patients with Medicaid, Medicare, and self-pay coverage experienced adjusted mean increases of 46%, 42%, and 60% in time to surgery, respectively, when compared with those with private insurance. In addition, patients of Black and Hispanic race/ethnicity, respectively, experienced adjusted mean increases of 36% and 20% in time to surgery relative to their White counterparts. Before a stone surgery, underinsured patients were more likely to revisit an ED three or more times, undergo two or more CT imaging studies, and receive upper urinary tract decompression. CONCLUSIONS: Underinsured and minority patients are more likely to experience a longer time to stone surgery after presenting to an ED and experience potential harm from this delay.

The "Acute" Stone Clinic Effect: Improving Healthcare Delivery by Reorganizing Clinical Resources.

OBJECTIVE: To determine the time to specialist urologic consultation and definitive management after establishing a subspecialist administered acute stone clinic (ASC) for adults with symptomatic upper tract stones in a publically funded universal healthcare system. MATERIALS AND METHODS: We retrospectively reviewed 337 adult referrals for stone management. Three distinct 9-week periods were assessed. Group 1 patients were seen/treated by their individual urologist before inception of a general urology emergency clinic (pre-EC). Group 2 patients were seen in a pooled EC and Group 3 patients were seen in the ASC. RESULTS: A total of 337 patients (75, pre-EC; 91, EC; 171, ASC) were reviewed. Mean time to consultation for pre-EC, EC, and ASC cohorts was 29, 7, and 7 days, respectively (p < 0.05), whereas loss to follow-up decreased from 13% to 5% (p < 0.05). On average, the number of patients seen per week increased from 9 to 20. Mean time to stone surgery from date of referral was 75 days pre-EC, 43 days EC, and 25 days ASC (p < 0.05). The percentage of patients undergoing surgery was between 59% and 63% per cohort; however, the number of patients increased from 5 to 11 per week. CONCLUSIONS: By reorganizing clinical resources, a dedicated ASC was able to increase patient capacity, reduce time to urologist consultation and reduce surgical wait times.

Assessment of electrocardiographic parameters in adult patients undergoing extracorporeal shockwave lithotripsy.

OBJECTIVE: Extracorporeal shock wave lithotripsy (ESWL) is a safe and effective treatment for urinary tract calculi. While serious side effects are rare, transient cardiac arrhythmias may occur. New electrocardiographic (ECG) parameters, such as P wave dispersion (PWD), QT dispersion (QTd), T peak to T end (Tp-e) interval, Tp-e interval/QT ratio, and Tp-e interval/corrected QT ratio have been defined to help predict atrial and ventricular arrhythmias. However, effect of ESWL on these ECG parameters has not been previously investigated. The present study was an examination of the effect of ESWL on ECG parameters. METHODS: Total of 40 consecutive patients who underwent ESWL were prospectively enrolled in the study. Pre-procedure ECG parameters were compared with post-procedure ECG parameters. RESULTS: PWD values were significantly longer on post-procedure ECG compared with pre-procedure ECG (p=0.017). Corrected QT duration and QTd were significantly longer on postprocedure ECG compared with pre-procedure ECG (p=0.046 and p=0.008, respectively). In addition, Tp-e interval, Tp-e interval/QT ratio, and Tp-e interval/QTc ratio were significantly longer post procedure (p=0.035, p=0.045, and p=0.022, respectively). In univariate correlation analysis, duration of procedure was significantly correlated with post-procedure PWD, QTc, and QTD values. CONCLUSION: Clinical use of ECG parameters may be helpful in monitoring of patients receiving ungated ESWL in order to detect cardiac dysrhythmia.

Easy-to-use equations for the estimation of urine relative saturation in the assessment of risk of recurrence in urinary stones formers.

It is a fact that recurrence of urinary stones is a common medical problem. One of the key factors used in determining the risk of urinary stone-formation is the urine relative saturation in the major constituents of lithiasis. Nomograms were developed in the 1970's to estimate the relative saturation of urine. We present here easy-to-use mathematical equations derived from these nomograms. These equations can be integrated directly in the LIS of any laboratories, and can be used as a tool in the treatment and prevention of recurrent stone-formation.

Comparison of High, Intermediate, and Low Frequency Shock Wave Lithotripsy for Urinary Tract Stone Disease: Systematic Review and Network Meta-Analysis.

OBJECTIVES: To perform a systematic review and network meta-analysis of randomized controlled trials (RCTs) to determine the optimal shock wave lithotripsy (SWL) frequency range for treating urinary stones, i.e., high-frequency (100-120 waves/minute), intermediate-frequency (80-90 waves/minute), and low-frequency (60-70 waves/minute) lithotripsy. MATERIALS AND METHODS: Relevant RCTs were identified from electronic databases for meta-analysis of SWL success and complication rates. Using pairwise and network meta-analyses, comparisons were made by qualitative and quantitative syntheses. Outcome variables are provided as odds ratios (ORs) with 95% confidence intervals (CIs). RESULTS: Thirteen articles were included in the qualitative and quantitative synthesis using pairwise and network meta-analyses. On pairwise meta-analyses, comparable inter-study heterogeneity was observed for the success rate. On network meta-analyses, the success rates of low- (OR 2.2; 95% CI 1.5-2.6) and intermediate-frequency SWL (OR 2.5; 95% CI 1.3-4.6) were higher than high-frequency SWL. Forest plots from the network meta-analysis showed no significant differences in the success rate between low-frequency SWL versus intermediate-frequency SWL (OR 0.87; 95% CI 0.51-1.7). There were no differences in complication rate across different SWL frequency ranges. By rank-probability testing, intermediate-frequency SWL was ranked highest for success rate, followed by low-frequency and high-frequency SWL. Low-frequency SWL was also ranked highest for low complication rate, with high- and intermediate-frequency SWL ranked lower. CONCLUSIONS: Intermediate- and low-frequency SWL have better treatment outcomes than high-frequency SWL when considering both efficacy and complication.

In Vitro Assessment of Three Clinical Lithotripters Employing Different Shock Wave Generators.

OBJECTIVE: To test the hypothesis that shock wave lithotripsy machines vary in their ability to fragment standardized artificial urinary calculi. MATERIALS AND METHODS: An in vitro test configuration was used to fragment synthetic U-30 Gypsum (U.S. Gypsum, Chicago, IL) stones (mean length 7.1 ± 0.2 mm, mean diameter 6.5 ± 0.07 mm, mean mass 299 ± 16 mg) using the Sonolith i-sys (EDAP TMS, Vaulx-en-Velin, France), Modulith SLX F2 (Storz Medical AG, Tägerwilen, Switzerland), and Piezolith 3000 (Richard Wolf GmbH, Knittlingen, Germany) lithotripters. Gypsum stones were placed at the nominal focus and treated with 250, 500, or 1000 shocks. The residual mass following passage through a 2-mm wire mesh was measured and compared using ANOVA and the Tukey-Kramer HSD test. RESULTS: There was no statistically significant difference between the Modulith SLX F2 and Piezolith 3000 lithotripters for 250 and 1000 shock treatments (p = 0.34 and 0.31, respectively). The Piezolith 3000 demonstrated the most favorable stone mass reduction for 500 shock treatments (187.4 ± 45.2 mg). The Sonolith i-sys was found to be significantly less effective than the other lithotripters for all shockwave conditions. Furthermore, performance of the Sonolith i-sys decreased beyond a threshold generator electrode age of 6000 shocks. CONCLUSIONS: This in vitro study found considerable variability in the ability of lithotripters to fragment synthetic urinary calculi. Synthetic stones were employed to provide a repeatable means of assessing variability in fragmentation efficiency of lithotripters. The Modulith SLX F2 and Piezolith 3000 are broadly equal and resulted in greater fragmentation efficiencies than the Sonolith i-sys. The performance of the Sonolith i-sys deteriorates at 6000 shocks, before the specified lifetime of 20,000 shocks.

Who "apparently" more spends, "in reality" spends less. Spending "a little" more for the rental of the extracorporeal lithotripter can save "a lot" about the days of hospitalization for urinary stones.

OBJECTIVE: The right to health (according to the Article 32 of the Italian Republic Constitution) is financially conditioned; for this reason the National Health System (NHS) has the objective of rationalize health expenditure according to the criteria of efficiency, effectiveness and economy. This paper is an example of rationalization concerning the extracorporeal shock wave lithotripsy (ESWL). MATERIALS AND METHODS: Hospital admissions for urinary stones were taken into account. "Edotto", the database of the Puglia region has identified 23 inpatient admissions during which was performed ESWL. A single operator performed ESWLs with a Storz lithotripter, Modulith SLK. RESULTS: The average hospital stay is conditioned by days "to wait" lithotripsy. In 2014 the hospitalization days "waiting for" lithotripsy were 100. The results were subjected to SWOT analysis and discussed with the Boston Consulting Group Matrix. DISCUSSION: Constant availability of the lithotripter would spare 100 days of hospitalization, amounting to € 88,200.00. This waste of resources corresponds to an additional cost equal to 98.3% on the cost for the rental of the lithotripter. Instead, reducing "unnecessary" hospitalization days would get a saving of 79.3% on the rental cost. It is as if for 46 days of the lithotripter rent were paid 46 days, while for 365 days of the lithotripter rent were paid only 11.8 sessions per year. CONCLUSIONS: Rationalization of resources is not necessarily a synonym of "reduction" of resources, but of reduction of waste in the NHS. A good plan is the most important rational basis to get more resources. About the process taken into account it is seen as an investment of € 21,450.00 would keep unchanged the effectiveness of lithotripsy service but would add efficiency and economy (increase of sessions/year, increase in the active mobility, increase in orthopedic treatments) and would drastically reduce the number hospital days (a waste).

Update on lasers in urology 2014: current assessment on holmium:yttrium-aluminum-garnet (Ho:YAG) laser lithotripter settings and laser fibers.

PURPOSE: The purpose of the study was to review the existing literature on holmium:yttrium-aluminum-garnet laser lithotripsy regarding lithotripter settings and laser fibers. METHODS: An online search of current and past peer-reviewed literature on holmium laser lithotripsy was performed on several databases, including PubMed, SciElo, and Google Scholar. Relevant studies and original articles about lithotripter settings and laser fibers were examined, and the most important information is summarized and presented here. RESULTS: We examine how the choice of lithotripter settings and laser fibers influences the performance of holmium laser lithotripsy. Traditional laser lithotripter settings are analyzed, including pulse energy, pulse frequency, and power levels, as well as newly developed long-pulse modes. The impact of these settings on ablation volume, fragment size, and retropulsion is also examined. Advantages of small- and large-diameter laser fibers are discussed, and controversies are highlighted. Additionally, the influence of the laser fiber is examined, specifically the fiber tip preparation and the lithotripter settings' influence on tip degradation. CONCLUSIONS: Many technical factors influence the performance of holmium laser lithotripsy. Knowing and understanding these controllable parameters allows the urologist to perform a laser lithotripsy procedure safely, efficiently, and with few complications.

[Inpatient therapy of urinary stones in Germany: development of the G-DRG system]. / Harnsteintherapie im stationären Bereich in Deutschland : Entwicklung des G-DRG-Systems.

BACKGROUND: The therapy of urinary stones in Germany is mostly a domain of hospitals even now. With the introduction of the German diagnosis-related groups (G-DRG) system in the years 2003/2004 an attempt was made to realize an ever-increasing fair representation and remuneration of treatment costs. Simultaneously, a declared target was to transfer all forms of treatment which did not necessitate hospital admission to the outpatient department. RESULTS: Analysis of the D-DRG data on running invoicing from all German hospitals from 2004/2005 to 2012/2013 showed an increase in case numbers of around 12% with a parallel increase in the volume of revenues of around 37%. A special feature was a reduction in the proportion of extracorporeal shockwave therapy (ESWL) as inpatient treatment with a parallel increase in the proportion of ureteroscopic and percutaneous interventions.

The impact of unplanned postprocedure visits in the management of patients with urinary stones.

BACKGROUND: Unplanned follow-up care is the focus of intense health policy interest, as evidenced by recent financial penalties imposed under the Affordable Care Act. To date, however, unplanned postoperative care remains poorly characterized, particularly for patients with kidney stones. Our objective was to describe the frequency, variation, and financial impact of unplanned, high-acuity, follow-up visits in the treatment of patients with urinary stone disease. METHODS: We identified privately insured patients undergoing percutaneous nephrostolithotomy, ureteroscopy, or shock-wave lithotripsy for stone disease. The primary outcome was occurrence of an emergency department visit or hospital admission within 30 days of the procedure. Multivariable models estimated the odds of an unplanned visit and the incremental cost of those visits, controlling for important covariates. RESULTS: We identified 93,523 initial procedures to fragment or remove stones. Overall, 1 in 7 patients had an unplanned postprocedural visit. Unplanned visits were least common after shock-wave lithotripsy (12%) and occurred with similar frequency after ureteroscopy and percutaneous nephrostolithotomy (15%). Procedures at high-volume facilities were substantially less likely to result in an unplanned visit (odds ratio 0.80, 95% confidence interval [95% CI] 0.74-0.87, P < .001). When an unplanned visit occurred, adjusted incremental expenditures per episode were greater after shock-wave lithotripsy ($32,156 [95% CI $30,453-33,859]) than after ureteroscopy ($23,436 [95% CI $22,281-24,590]). CONCLUSION: Patients not infrequently experience an unplanned, high-acuity visit after low-risk procedures to remove urinary stones, and the cost of these encounters is substantial. Interventions are indicated to identify and reduce preventable unplanned visits.

Urinary stone disease - assessment and management.

Background Urinary stones affect one in 10 Australians. The majority of stones pass spontaneously, but some conditions, particularly ongoing pain, renal impairment and infection, mandate intervention. Objective This article explores the role of the general practitioner in the assessment and management of urinary stones. Discussion The assessment of acute stone disease should determine the location, number and size of the stone(s), which influence its likelihood of spontaneous passage. Conservative management, with the addition of alpha blockers to facilitate passage of lower ureteric stones, should be attempted in cases of uncomplicated renal colic. Septic patients require urgent drainage and antibiotics. Other indications for referral and intervention include ongoing pain, renal impairment and stone size unlikely to pass spontaneously. There are many ways to eliminate stones, but laser lithotripsy is being used with increasing frequency. Up to 50% of people with a first presentation of stone disease will have a recurrence within 5 years. General advice for stone prevention consists of increasing fluid intake, especially water (sufficient to maintain dilute urine output), avoiding added salt and maintaining a well balanced low oxalate diet. Some patients may require a more detailed metabolic assessment and specific dietary advice.

Durability of reusable holmium:YAG laser fibers: a multicenter study.

PURPOSE: Single use and reusable variants of holmium:YAG laser fibers are available to treat calculi during ureteroscopic procedures. In this prospective, multicenter study we evaluated a series of reusable holmium:YAG laser optical fibers. We hypothesized that reusable fibers provide a cost advantage over single use variants. MATERIALS AND METHODS: We prospectively recorded fiber data, including type, size, number of uses, laser pulse energy and frequency, and total energy delivered. All fibers were new and purchased off the shelf by staff at each institution. We performed a cost analysis comparing reusable fibers to single use variants. RESULTS: During 541 procedures a total of 37 holmium:YAG optical laser fibers were used, including 21 Laser Peripherals 270 (Laser Peripherals, Golden Valley, Minnesota), 7 Laser Peripherals 365, 4 Lumenis SlimLine™ 200 and 3 Lumenis SlimLine 365 fibers. After stratifying by core size 365 µm core fibers had significantly more uses than 270 µm core fibers (average 23.5 vs 11.3, p < 0.02). By fiber type the mean ± SE number of uses was 12.8 ± 2.44, 3 ± 0.4, 21.3 ± 7.12 and 28.7 ± 6.69 for the Laser Peripheral 270, Lumenis SlimLine 200, Laser Peripherals 365 and Lumenis SlimLine 365, respectively. The total cost savings for reusable fibers vs single use variants was $64,125. CONCLUSIONS: Reusable holmium:YAG optical laser fibers are a more cost-effective option than single use variants. Fibers with a 365 µm core provide more uses than smaller 270 µm variants.

Assessment of stone composition in the management of urinary stones.

Several explanations have been suggested to account for the failure of extracorporeal shockwave lithotripsy (ESWL) treatment in patients with urinary stones, including large stone volume, unfavorable stone location or composition and the type of lithotriptor used. Unfavorable stone composition is considered a major cause of failure of ESWL treatment, and consequently knowledge of the stone composition before treatment is initiated is desirable. Plain abdominal radiographs cannot accurately determine either stone composition or fragility, and although the CT attenuation value in Hounsfield units (HU) (that is, normalized to the attenuation characteristics of water) is useful, this parameter has limited value as a predictor of stone composition or the response to ESWL treatment. By contrast, stone morphology as visualized by CT correlates well with both fragility and susceptibility to fragmentation by ESWL. For patients prone to recurrent calculi, analyses of stone composition are especially important, as they may reveal an underlying metabolic abnormality. The development of advanced imaging technologies that can predict stone fragility is essential, as they could provide extra information for physicians, enabling them to select the most appropriate treatment option for patients with urinary stones.

Clinical and economic impact of implementation of slow shockwave lithotripsy for the treatment of urinary calculi.

AIM: To analyze the impact of slowing the shockwave delivery during extracorporeal shockwave lithotripsy (SWL) on the clinical patient outcome and the cost of delivering this service in a community practice. PATIENTS AND METHODS: The data from 1745 consecutive SWL procedures were analyzed at a freestanding surgery center. About 872 treatments were performed at 120 shocks per minute (fast rate [FR]) and 873 were performed at 60 shocks per minute (slow rate [SR]) using a Lithotron machine. Ninety-nine percent of the patients received 3000 shocks. The location and stone size were similar in both groups. Stone-free rate was determined by a plain film of the abdomen at follow-up. RESULTS: The clinical outcome of SR shows a statistically significant improvement in stone-free rate on all stone locations and stone sizes except for those smaller than 25 mm(2). The need for additional secondary treatment decreased from 35.4% to 18.2%. The anesthesia time increased from 26 to 50 minutes per treatment. On the basis of Medicare reimbursement, there was an increase of $28,294 for anesthesia services by going SR. However, the savings realized as a result of decrease in secondary procedures was $264,989, resulting in a total savings of $236,695 during the study period. The cost savings was $271.13 per SWL treatment. CONCLUSION: The slowing of SWL treatment results in a longer procedure decreasing the time available for treatment; however, the clinical outcome results in improved patient quality of care and decreased cost. Slowing SWL both benefits the patient and decreases the cost of SWL in the community setting.

Which efficiency index for urinary stones treatment?

Clinical results in urinary stones management are often reported using the stone-free (SF) rate, which is simple, reproducible and useful to compare techniques or centers. But this index does not take into account costs or patients' quality of life. In a way, SF "pursuit", which cannot be considered as a universal therapeutic goal could increase costs and decrease patients' comfort. We retrospectively reviewed files of stone management to describe costs according to several items and we emphasize the need for a true efficiency index.