Publications by authors named "Vernon Pais"

Introduction: Free radical-mediated oxidative renal tubular injury secondary to hyperoxaluria is a proposed mechanism in the formation of calcium oxalate stones. Vitamin E, an important physiologic antioxidant, has been shown in rat models to prevent calcium oxalate crystal deposition. Our objective was to determine if low dietary vitamin E intake was associated with a higher incidence of stones.

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Article Synopsis
  • - The study aimed to evaluate how kidney stone disease (KSD) and its treatments affect the health-related quality of life (HRQOL) in high-risk patients with conditions like hyperparathyroidism and medullary sponge kidney.
  • - Researchers used a questionnaire on 3,301 patients over six years, revealing that high-risk patients (120 of 1,499 active KSD patients) reported significantly lower HRQOL scores than controls.
  • - Specific conditions such as medullary sponge kidney disease and renal tubular acidosis were linked to worse HRQOL, while alkali therapy was associated with improved HRQOL, highlighting the need for earlier identification and treatment of high-risk patients.
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Objective: To assess the effects of tranexamic acid (TXA) in individuals with kidney stones undergoing percutaneous nephrolithotomy (PCNL).

Patients And Methods: We performed a literature search of Cochrane Library, PubMed (including MEDLINE), Embase, Scopus, Global Index Medicus, trials registries, grey literature, and conference proceedings. We included randomised controlled trials (RCTs) that compared treatment with PCNL with administration of TXA to placebo (or no TXA) for patients aged ≥18 years.

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Background: Kidney stones (also called renal stones) can be a source of pain, obstruction, and infection. Depending on size, location, composition, and other patient factors, the treatment of kidney stones can involve observation, shock wave lithotripsy, retrograde intrarenal surgery (RIRS; i.e.

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Objectives: To assess the effects of percutaneous nephrolithotomy (PCNL) vs retrograde intrarenal surgery (RIRS) for the treatment of renal stones in adults.

Methods: We performed a comprehensive search of the Cochrane Library, MEDLINE, Embase, three other databases, trials registries, other sources of the grey literature, and conference proceedings up to 23 March 2023. We applied no restrictions on publication language or status.

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Article Synopsis
  • Percutaneous nephrolithotomy (PCNL) is the preferred method for treating large kidney stones, but it has a higher risk of bleeding compared to other treatments like ureteroscopy and shock wave lithotripsy.
  • Tranexamic acid (TXA) is tested in this context as a potential solution to reduce bleeding in patients undergoing PCNL.
  • The study reviewed data from 10 randomized controlled trials, involving 1,883 participants, focusing on outcomes such as blood transfusions, stone-free rates, and complications related to the use of TXA during the procedure.
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Patients with recurring kidney stone events can expect significant morbidity and functional impairment. Few studies have evaluated the effect of bilateral kidney stones on disease progression and quality of life. We wanted to determine the association of bilateral stone disease on age of onset, and the impact on number of stone events and individual kidney stone disease-specific health-related quality of life (HRQOL) by analyzing the validated and prospectively collected Wisconsin Stone Quality of Life (WISQOL) database.

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  • Residual fragments (RFs) after percutaneous nephrolithotomy (PCNL) can negatively affect patients' quality of life, and this study aimed to analyze their natural history and impacts based on different sizes of RFs.
  • The study included data from 439 patients and found that larger RFs (>4 mm) were linked to higher rates of reintervention and complications, while smaller RFs (≤2 mm) had better outcomes in terms of passage and lower regrowth rates.
  • Factors such as age, body mass index, and RF size were significant predictors of stone-related events, emphasizing the importance of managing residual fragments for better patient outcomes after PCNL.
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With a 5-year stone recurrence rate of 30% to 50%, kidney stone formers are subject to significant morbidity that negatively impacts their health-related quality of life (HRQOL). We sought to determine the impact of age at kidney stone onset, duration of stone disease, and kidney stone event (surgery or stone passage) on HRQOL of individual patients by querying the validated and prospectively collected Wisconsin Stone Quality of Life (WISQOL) database. Cross-sectional data were obtained from a total of 2438 kidney stone formers from 14 institutions in North America who completed the WISQOL questionnaire during the period from 2014 to 2019.

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Introduction: The management of an incidentally discovered, asymptomatic renal stone includes watchful waiting, shock wave lithotripsy, ureteroscopy with basket extraction of fragmented stones (URS-B) or ureteroscopy with laser "dusting" (URS-D). Each intervention has varying stone-free rates, requirements for ureteral stenting, and variable impact on a patient's quality of life. Decision analysis was used to assess the optimal quality adjusted life-years associated with each treatment option.

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We report a case of esophageal cancer with solitary metastasis to the testicle in a 71-year-old man. The tumor was picked up on physical exam following new onset complaints of pain and swelling. While most testicular masses in older men are due to lymphoma, this case highlights the need to consider metastatic disease as a source of new symptoms in patients with a recent cancer diagnosis.

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In recent years, the use of opioids in medical practice has come under significant scrutiny. This, in part, is owing to evidence of overprescription and overuse of opioid medications, as well as the unintended consequences and side effects for patients who take these medications. Here, we review the role of opioids and the responsible use of these medications with respect to kidney stone disease and surgical interventions for kidney stones.

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Rationale & Objective: There are several well-known anatomical and physiological changes during pregnancy that could contribute to kidney stone formation, but evidence that they increase the risk of kidney stones during pregnancy is lacking. We determined whether there was an increased risk of a first-time symptomatic kidney stone during and after pregnancy.

Study Design: A population-based matched case-control study.

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Unlabelled: INTRODUCTION To assess the relationship between pain after ureteral stent removal and patient and procedural factors.

Materials And Methods: A validated survey designed to assess the relationship between quality of life and treatment decisions in kidney stone disease was randomly distributed to patients with a history of a ureteral stent in seven medical centers across North America participating in an endourology research collaborative between July 2016 and June 2018. The primary outcome was increased pain after ureteral stent removal.

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Purpose: It is well documented that the prevalence of nephrolithiasis is increasing in adults in the United States over time. Approximately 11% of men and 7% of women have reported a lifetime history of nephrolithiasis in cross-sectional studies. However, the burden of acute management may be better assessed from annual cumulative incidence.

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Article Synopsis
  • * Results showed that the median number of kidney stone events was 3, with patients reporting an average WISQOL score of 107.4, indicating a connection between more stone events and lower quality of life.
  • * Specifically, having more than five kidney stone events significantly worsened quality of life, highlighting the need for better understanding and management of recurrent kidney stones.
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Erdheim-Chester disease (ECD) is a rare systemic histiocytosis with urologic manifestations in a majority of affected patients. An important manifestation is a pronounced retroperitoneal fibrosis with reported dense inflammatory rind surrounding the kidneys. We report a case of a patient with large stone burden necessitating percutaneous nephrolithotomy and the implications related to his Erdheim-Chester-related retroperitoneal fibrotic changes.

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Objective: To compare the health-related quality of life (HRQOL) of patients with residual fragments after surgical intervention for kidney stones to patients that are stone-free using the disease-specific Wisconsin stone quality of life (WISQOL) questionnaire. Kidney stones contribute to impaired HRQOL, which is increasingly recognized as an important healthcare outcome measurement.

Materials And Methods: With institutional review board approval, 313 adult patients who underwent surgical intervention for kidney stones at 4 sites completed a WISQOL questionnaire.

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