Arab, Sammy

Background Burnout arises from prolonged, unresolved work-related stress and adversely affects professional performance and overall well-being. Resident doctors and medical students are particularly vulnerable because of the demands of balancing clinical, academic and related responsibilities. Aims This study aimed to assess self-reported burnout and related stressors among UK resident doctors and medical students, and estimate the economic impact of burnout-related absenteeism among resident doctors. Method Self-report questionnaires assessing burnout and related stressors were distributed to UK resident doctors and medical students. A total of 2793 responses were received: 1439 (51.5%) from resident doctors and 1354 (48.5%) from medical students. Economic losses from absenteeism were calculated with a human capital approach. Results Burnout was reported by 70% ( n = 1008) of resident doctors and 65.7% ( n = 889) of medical students. Notably, 56.8% ( n = 573) and 79.3% ( n = 705) of resident doctors and medical students affected by burnout, respectively, were unaware of available support services. Relocation stress (85.1% of residents and 62.6% of students), financial stress (53.9% of residents and 57.8% of students) and poor work–life balance (32.1% of residents and 20.7% of students) were commonly reported. The annual economic burden of absenteeism related to burnout among resident doctors was estimated to reach £251.5 million. Conclusions Burnout among UK resident doctors and medical students may reflect a combination of underlying factors, including financial strain, relocation stress and difficulties with work–life balance. These findings underscore the need for targeted interventions that support well-being and address financial and relocation challenges, which may, in turn, help prevent burnout and improve retention within the medical workforce. Reducing burnout and associated stressors may also help lessen its economic impact, allowing resources to be redirected towards patient care.

Introduction: Endothelial cell (EC) dysfunction, driven by comorbidities of heart failure with preserved ejection fraction (HFpEF), has emerged as a potential contributor to disease progression, yet the EC specific molecular mediators in HFpEF remain poorly defined. Purpose: To identify EC-specific molecular mediators that are involved in HFpEF and determine their functional roles in disease pathogenesis. Hypothesis: Based on omics analysis of a murine HFpEF model, we hypothesized that EC plasminogen activator inhibitor-1 (PAI-1) is a key mediator of HFpEF pathogenesis. Methods: Male RiboTagEC (Cdh5CreERT2+/Rpl22HA/+) mice were used in a HFpEF model induced by hypertensive/metabolic stresses (60% calories from lard and L-NAME 0.5 g/L in water) or administrated with normal water and diet as controls. Hearts and skeletal muscle were collected for both bulk RNA sequencing (Bulk-seq) and EC-specific translatome analysis using translating ribosome affinity purification assay followed by RNA-sequencing (TRAP-seq). The functional roles of EC PAI-1 were tested using male tamoxifen-inducible, endothelial specific PAI-1 knockout (Cdh5CreERT2+/PAI-1flox/flox, PAI-1iEC KO) and control mice (PAI-1flox/flox, PAI-1iEC+/+) subjected to HFpEF induction. Cardiac function was assessed by echocardiography, pressure–volume (PV) loop analysis, and treadmill exercise testing. Student’s t-test was used (p < 0.05). Results: Bulk-seq and EC-specific TRAP-seq identified PAI-1 as one of the most upregulated genes in both heart and skeletal muscle EC in HFpEF. Bulk-seq demonstrated a 2.5-fold change (FC, log 2 FC=1.35) increases in the heart and 12.2-fold increases (log 2 FC = 3.61) in the skeletal muscle. TRAP-seq showed a 1.75-fold change (log 2 FC=0.81) increases in the heart and 4.76-fold increases (log 2 FC = 2.25) in the skeletal muscle. These consistent findings led us to investigate the functional role of EC PAI-1 in the pathogenesis of HFpEF. With similar body weight (Control: 40±4 g, n=10; KO: 38±6 g, n=11; p=0.319) and ejection fraction (Control: 54±6 %, n=10; KO: 54±5 %, n=12; p=0.686), we found that PAI-1iEC KO mice exhibited improved diastolic function after 10 weeks of HFpEF induction. Specifically, echocardiography demonstrated a significant reduction in E/e′ in KO mice (Control: 27±4, n=10; KO: 24±3, n=12; p=0.018). PV analysis confirmed this improvement with lower end-diastolic pressure (Control: 19±2 mmHg, n=8; KO: 13±5 mmHg, n=10; p=0.009), reduced Tau (Control: 9.7±1.2 ms, n=8; KO: 8.6±1.0 ms, n=10; p=0.047), and a reduced EDPVR constant β (Control: 0.20±0.05, n=6; KO: 0.10±0.03, n=6; p=0.017). KO mice also exhibited improved treadmill running distance (Control: 179±35 m, n=10; KO: 214±40 m, n=12; p=0.043). Conclusion: Endothelial PAI-1 contributes to diastolic dysfunction and reduced exercise capacity in HFpEF. These findings highlight endothelial PAI-1 as a potential therapeutic target for HFpEF. This abstract was presented at the American Physiology Summit 2026 and is only available in HTML format. There is no downloadable file or PDF version. The Physiology editorial board was not involved in the peer review process.