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Variations in liver allocation systems worldwide are presented, with a specific focus on regional differences and their potential impact on outcomes, with the goal of serving as a reference for future policy development. Summaries of liver allocation across multiple European, Scandinavian, and Asian systems, as well as the combined allocation system of Australia plus Canada, the United States, and the systems in Central America, South America, and the Caribbean are reviewed. A comprehensive comparison of how different regions address MELD exceptions, primarily focusing on hepatocellular carcinoma, along with the most common etiologies of liver disease requiring transplantation is presented. In addition, the adoption of living donation and donation after circulatory death is discussed. The study involves contributions from a diverse group of world experts in liver transplantation and may serve as an essential resource to foster international dialogue as countries strive to optimize organ allocation policies, including MELD exceptions.

Background. Living kidney donation (KD) evaluation particularly focuses on glomerular filtration rate (GFR). Assessing GFR in living kidney donors can be done by estimation (eGFR) or measurement (mGFR). This study aims to evaluate the impact of eGFR equations, focusing on the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) 2021 equation for donor eligibility screening and the reclassification of donors excluded by eGFR criteria to mGFR assessments. Methods. Retrospective, single-center observational study of 2512 kidney donors evaluated between 2011 and 2023, at the Mayo Clinic. We performed analyses and comparisons of 4 eGFR formulae and 2 mGFR methods in terms of performance, eligibility criteria according to Kidney Disease: Improving Global Outcomes guidelines/age-adjusted criteria, eligibility reclassification, and subgroup analyses. Results. The CKD-EPI 2021 resulted in a higher percentage of patients being eligible for KD (81.4%) and achieved the highest P10 (32%–34%) and P30 (87%–88%) across all mGFR methods. When patients were deemed eligible for donation by any eGFR formula, 95% retained this status on reassessment with mGFR. Conversely, when an eGFR formula classified a patient as ineligible, this was revised to be eligible in about 90% of cases on reassessment with mGFR, with a higher reclassification rate observed when the IoCl was used instead of CrCl. Conclusions. The CKD-EPI 2021 performs best for screening potential KD. If a KD is deemed ineligible by CKD-EPI 2021, there is a high likelihood that they will be reclassified as eligible when assessed with mGFR. This study strongly supports using mGFR in donor evaluations, especially when the eGFR does not meet the criteria to ensure equity of access to being a living donor.

BACKGROUND: Significant disparities persist in timely, guideline-concordant breast cancer treatment across the US, impacting cancer outcomes. The influence of both patient-level and facility-level socioeconomic status (SES) on adherence to Commission on Cancer quality measures remains incompletely understood. STUDY DESIGN: We conducted a retrospective cohort study using the National Cancer Database to assess associations between patient and facility SES and concordance with timeliness of 3 Commission on Cancer breast cancer quality measures: surgery, multiagent chemotherapy, and radiotherapy, among patients diagnosed from 2018 to 2022. Multivariable logistic regression models were used to evaluate predictors of concordant care, including a composite measure of facility-level social risk. RESULTS: The analytic cohorts included 471,425 patients for surgery, 82,734 for chemotherapy, and 311,523 for radiotherapy. Black race, uninsured status, and lower educational attainment were each independently associated with lower odds of receiving guideline-concordant care across all measures. Patients treated at low-SES facilities had higher odds of receiving timely surgery (adjusted odds ratio [OR] 1.27, 95% CI 1.24 to 1.31) but lower odds of receiving timely chemotherapy (OR 0.85, 95% CI 0.79 to 0.91) and radiotherapy (OR 0.95, 95% CI 0.92 to 0.97) compared with those at other institutions. Facility type, fragmented care, and comorbidities also contributed to variation in concordance. CONCLUSIONS: Significant disparities in guideline-concordant breast cancer care persist by race, insurance, education, and facility-level social risk, highlighting intervention opportunities to improve outcomes for these already vulnerable populations. These findings highlight the importance of policy and institutional strategies that address both patient- and facility-level barriers to ensure equitable access to high-quality multidisciplinary treatment.

Purpose Lower extremity spasticity can cause pain and limit function. This study examined the safety and efficacy of hyperselective neurectomy (HSN) of the gastrocnemius-soleus complex (GSC) in addressing spastic equinus deformities in pediatric patients. Methods Pediatric patients that underwent HSN of the GSC by a single surgeon were retrospectively reviewed. Preoperative and postoperative Modified Ashworth Score and passive ankle dorsiflexion (°) were compared using Wilcoxon signed-rank test and Student's paired two-tailed t-test, respectively. Results Ten lower extremities in seven patients with a mean age of 10 years were reviewed. Mean follow-up was 15 months. All extremities demonstrated improvement in spasticity. All exhibited improved passive ankle dorsiflexion range of motion with the knee in extension (mean change +17°, SD = 8°, p = 0.000). Five patients demonstrated improved passive dorsiflexion with the knee in flexion while two remained unchanged from preoperative assessment (mean change +13°, SD = 9°, p = 0.002). One complication, wound dehiscence, was noted and managed conservatively. No patients reported loss of strength or sensation. Four patients underwent subsequent staged surgery on the ipsilateral extremity for concomitant contractures. Conclusion HSN of the GSC is safe in pediatric patients and effectively reduces spastic equinus deformity and improves ankle passive dorsiflexion in short-term follow-up.

Abstract This article provides an overview of deep-learning–based techniques in CT image reconstruction and processing (referred to as “DLR”), covering technical implementations, performance evaluation, radiation dose reduction, and future perspectives. DLR methods can be categorized into projection-space, projection-to-image-space, image-space, and various hybrid techniques, with applications such as noise reduction, artefact correction, and spatial resolution enhancement. Performance evaluations include phantom-based studies, patient image-based studies, and virtual imaging trials. These evaluation studies demonstrated that DLR can effectively reduce image noise while preserving an image texture like in traditional filtered-backprojection (FBP) images, although the extent of radiation dose reduction varies widely depending on the study and the specific diagnostic task. Challenges remain in low-contrast lesion detection and characterization, where dose reduction may still be less than 50% compared to traditional reconstruction methods. Additionally, the potential for DLR methods to generate false structures or “hallucinations,” especially at low radiation doses, emphasizes the need for effective monitoring and mitigation strategies from both technical and clinical perspectives. Quantitative, accurate, and efficient evaluation techniques, such as virtual image trial-based methods, can be explored to help optimize these algorithms for reducing radiation dose and enhancing diagnostic performance.

Introduction: Renal accessory arteries originate at the aorta and deliver renal blood flow independent of the main renal artery, while renal artery branches originate from and their flow depends on the main renal artery. However, the clinical significance of accessory arteries remains unclear. We tested the hypothesis that characteristics of renal accessory and/or branching arteries morphology are linked to resistant hypertension (RH). Methods: In a case-control study we compared the presence and characteristics of renal accessory and branching arteries (exposures) in individuals with RH (cases) vs. healthy kidney donors (normotensive controls) (Figure 1). Using MR angiography we calculated the length, diameter, tortuosity, and resistance (8*Length*blood viscosity)/(πr 4 )) of each artery (Figure 2). In separate logistic regression analyses we compared cases and controls for each of the following accessory or branching artery parameters: number of vessels, smallest diameter, length of longest vessel, greatest tortuosity, and greatest resistance. Results: We compared 89 unique RH cases to 248 unique normotensive controls (Table 1). For accessory arteries, their number was inversely related with RH (OR 0.38, 95% CI: 0.21 to 0.69, p<0.01), while length was mildly associated with RH (OR 1.06, 95% CI 1.00 to 1.13, p=0.04). Diameter and tortuosity were not associated in either direction. For branching arteries, RH was strongly associated with their diameter (OR 12.86, 95% CI 2.89 to 57.13, p<0.01), but more mildly and inversely with their resistance (OR 0.99, 95% CI: 0.97 to 1.00, p=0.01). The number and length of branching arteries were not associated in either direction. Conclusion: RH is strongly associated with a reduced number of accessory renal arteries and wider branching arteries, both being novel findings. Future longitudinal studies should determine if these changes are causally related to development of hypertension. Elucidation of this relationship may open new avenues for management of RH.

Background: Aging increases the risk of resistant hypertension which is associated with an increased risk of mortality and cardiovascular events. Here, we examined the characteristics, blood pressure (BP) trajectories, and treatment patterns of older patients with apparent treatment resistant hypertension (aTRH). Hypothesis: We hypothesized aTRH would be undertreated, especially in octogenarians. Methods: We conducted a retrospective study of all patients with two available ambulatory BP measurements separated by at least 3 months in a community-based teaching hospital. aTRH was defined as BP above goal despite the use of ≥3 antihypertensive medication classes or controlled BP on ≥4 antihypertensive medication classes. Results: Of the 71,470 patients with available data, 7308 (10.2%) met criteria for aTRH with a mean follow-up length of 18.9 months. Compared to patients with normal BP, patients with aTRH were older with a mean age of 74 years versus 65 years (p<0.001). Patients with aTRH were more likely to be males (58.3%) compared to the normal BP groups (40.6%, p<0.001) (Figure 1). Compared to patients with normal BP, patients with aTRH were more likely to be obese and have a higher prevalence of smoking history, diabetes, coronary artery disease, heart failure, peripheral arterial disease, atrial fibrillation, and chronic kidney disease (Figure 1). Amongst those with aTRH, 1566 (5.3%) were aged 18-65, 3763 (13.2%) were aged 66-79, and 2623 (19.7%) were ≥80 years old. At follow-up, among those with aTRH at baseline, 5773 (72.6%) remained with aTRH, 896 (11.3%) improved to non-aTRH, 1270 (16.0%) improved to controlled BP, and 13 (0.2%) improved to normal BP (Figure 2). Most patients irrespective of age had no change in the number of medications at follow-up; only 15.5% of octogenarians with aTRH had an increase in antihypertensives (Figure 3). Between baseline and follow up, octogenarians as a whole had a systolic BP drop of -2.34 (p<0.001), and diastolic BP drop of -0.56 (p=0.061), whereas octogenarians with aTRH had a systolic BP drop of -3.7 (p<0.001) and diastolic BP drop of -0.55 (p=0.050). Conclusion: In an ambulatory population of patients at a community hospital, the prevalence of aTRH was high among patients ≥80 years and associated with established cardiovascular risk factors. Most patients with aTRH do not have a change in BP status over time. Anti-hypertensive medication escalation is infrequent among patients with aTRH irrespective of age.

Introduction: Resistant and uncontrolled hypertension pose persistent clinical and public health challenges. Renal denervation, a catheter-based procedure targeting renal sympathetic nerves, has emerged as a promising approach to lower blood pressure by reducing sympathetic overactivity. Hypothesis: A systematic review and meta-analysis of sham-controlled trials investigated whether renal denervation results in sustained blood pressure reduction across short-, medium-, and long-term follow-up. Methods: We searched PubMed, Embase, CENTRAL, and Web of Science through March 2025. The protocol was registered in PROSPERO (CRD420251015937). Randomized, sham-controlled trials of renal denervation in resistant/uncontrolled hypertension were included. Primary outcomes were ambulatory blood pressure (daytime, nighttime, and 24-hour); secondary outcomes included office and home blood pressure measurements. Follow-up durations were categorized into three groups: less than 6 months, 6–12 months, and greater than 12 months. Risk of bias was assessed using RoB-2. Results: Twenty trials (25 reports) with 2,167 RDN patients and 1,744 sham controls were included. Most trials had a low risk of bias. RDN significantly reduced 24-hour SBP (–3.29 mmHg, 95% CI: –5.91 to –0.67) and DBP (–1.42 mmHg, 95% CI: –2.29 to –0.55), despite high heterogeneity (I2 > 90%). Daytime DBP showed a significant reduction (–2.90 mmHg, 95% CI: –4.39 to –1.41), while other BP measures were less consistent. Home SBP was significantly reduced (–5.04 mmHg, 95% CI: –8.50 to –1.58). At 6–12 months, 24-hour SBP reduction persisted (–3.36 mmHg, 95% CI: –5.71 to –1.01), but DBP effects were nonsignificant. Long-term follow-up revealed nonsignificant changes in systolic blood pressure and diastolic blood pressure. Conclusions: Renal denervation modestly lowers BP in the short term (<6 months). Mid-term SBP reduction persists, but diastolic and long-term effects are inconsistent. These findings highlight the need for refined patient selection, optimized techniques, and longer follow-up trials.

Introduction: Hypertension is an important modifiable risk factor for cardiovascular diseases. Cuffless blood pressure monitors (CL-BPMs) have emerged as convenient alternatives to traditional cuff-based monitors (C-BPMs). We aim to compare both modalities quantitatively and elaborate on the diagnostic accuracy of CL-BPM. We also discuss the need to address shortcomings of CL-BPMs that limit their current use in widespread clinical practice. Methods: We pooled data from 14 studies that simultaneously compared CL-BPM and C-BPM for ambulatory blood pressure monitoring (ABPM). The results were reported as mean differences (MD) in systolic and diastolic blood pressures (SBP and DBP) between the two modalities. Inverse variance weighted analysis was used to calculate pooled estimates. Tau 2 and I 2 statistics were used to assess heterogeneity. Results: A total of 1011 participants were included. Meta-analysis showed a 24-hour MD of 3.18 [95% CI 1.18-5.19, P=0.002] for SBP and 1.79 [95% CI (-0.43)-4, P=0.11] for DBP, with moderate and high heterogeneity (I 2 = 45% and 78%), respectively. MD in daytime SBP and DBP between the two modalities were 2.52 [95% CI 0.41-4.63, P=0.02] and 0.89 [95% CI (-1.17)-2.96, P=0.4], respectively. An MD of 9.02 [95% CI 4.56-13.49, P<0.0001] was observed for nighttime SBP, whereas it was 6.67 [95% CI 2.59-10.75, P=0.001] for nighttime DBP. Our findings suggest a significant difference in means of 24h SPB, day SBP, night SBP, and DBP between the two modalities, suggesting that cuffless monitors are not on par with cuffed monitors for these measurements. However, there was no significant difference in the means of 24-hour DBP and daytime DBP between the two modalities, suggesting that the cuffless devices were as accurate as the cuffed monitors in these scenarios. Conclusion: CL-BPMs showed an overall significant MD in BP compared to the standard C-BPM. Although the CL-BPM may be convenient, user-friendly, and help eliminate limb-circumference-based cuff sizing, it has some challenges. These include complex calibration protocols; accuracy concerns in several subgroups like individuals with dark skin tone, obesity, and pregnancy; and inability to track BP during sleep, exercise, and while on antihypertensives. Substantial heterogeneity in the results indicates a lack of standardized validation protocols. Detailed studies and subgroup analyses are required to validate these devices before their widespread use in clinical practice.