Publications by authors named "Madison Lyon"

Objective: To compare neonatal outcomes following URS, stent, or PCN in pregnant women presenting with suspected renal colic.

Methods: Women undergoing a procedure for suspected renal colic during pregnancy at a large multi-center institution between 2008 and 2022 were retrospectively reviewed and categorized by initial intervention. Neonatal outcomes were recorded and linked to maternal and obstetric data.

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Introduction: Anesthesia choice during the procedural management of suspected renal colic during pregnancy may vary based on available resources and patient or provider preferences, as there are no specific recommendations. Our objective was to evaluate whether preterm birth (<37 weeks) was associated with anesthesia type, anesthesia timing by trimester, or procedure type.

Methods: We retrospectively identified pregnant patients who required procedural management with ureteral stent, percutaneous nephrostomy (PCN), or ureteroscopy (URS) for suspected renal colic based on laboratory and imaging findings from 2009-2021 at our center.

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Article Synopsis
  • * Out of 100 reviewed patients, 78 were analyzed, revealing that those who underwent PCN had the highest total mean radiation exposure (286.9 mGy) and required significantly more procedures compared to the other two interventions.
  • * The results indicated that PCN not only led to higher radiation exposure but also resulted in more complications, with over 40% of PCNs experiencing dysfunction and an average exchange period of 16.5 days.
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Introduction: Wound related complications (WRC) are a significant source of morbidity in kidney transplant recipients, and may be mitigated by surgical approach. We hypothesize that the anterior rectus sheath approach (ARS) may decrease WRC and inpatient opiate use compared to the Gibson Approach (GA).

Methods: This double-blinded randomized controlled trial allocated kidney transplant recipients aged 18 or older, exclusive of other procedures, 1:1 to ARS or GA at a single hospital.

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Purpose: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has a disproportionately severe effect on men, suggesting that the androgen pathway plays a role in the disease. Studies on the effect of castration and androgen receptor blockade have been mixed, while 5α-reductase inhibitor (5ARI) use in men with COVID-19 (2019 novel coronavirus) have shown potential benefits. We assessed the association of 5ARI use on risk of community acquired SARS-CoV-2 infection.

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Purpose: To describe the overall extirpative renal surgery (ERS) training volume reported by PU and PS.

Methods: Case log data from the Accreditation Council for Graduate Medical Education (ACGME) was examined from 2013-2016 for surgery residents (S), urology residents (U), pediatric surgery fellows (PS) and pediatric urology fellows (PU). Case log information for all levels of participation over all case categories that could potentially offer ERS volume were recorded.

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Objective: To develop a nomogram to estimate the probability of positive sentinel lymph node (+SLN) for patients with thin melanoma and to characterize its potential impact on sentinel lymph node biopsy (SLNB) rates.

Methods: Patients diagnosed with thin (0.5-1.

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Alvimopan is a μ-opioid receptor antagonist used in the post-operative period to decrease rates of post-operative ileus (POI) following radical cystectomy (RC) and thereby shorten length of stay (LOS). Naloxegol is a much less expensive drug of the same class that has yet to be studied for prevention of POI in the peri-operative period. The purpose of the current study is to evaluate the differences in LOS and development of POI in patients post-RC who take alvimopan versus those who take naloxegol, with the hope that drug efficacy can be evaluated against the significant difference in cost burden between the two drugs.

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