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Doctoral research in nursing is central to advancing scientific knowledge, strengthening professional identity, and informing evidence-based practice, education, and health policy. Analyzing the thematic content of doctoral theses offers insight into research priorities and national variations in nursing scholarship. Yet, no systematic cross-country analysis has examined the thematic focus of such work.
To explore and describe the diversity and scope of doctoral nursing research themes across eight countries in the Sigma Europe Region, identifying key areas of scholarly focus and shared priorities.
A document-based qualitative study using reflexive thematic analysis, as outlined by Braun and Clarke, to examine patterns of meaning within thesis summaries.
The study included doctoral nursing thesis summaries defended between January 2020 and December 2023, sourced from national and institutional repositories in eight countries of the Sigma Europe Region. A total of 15 repositories (4 national, 11 institutional) were systematically searched, and additional summaries were obtained via direct contact with universities offering doctoral nursing programmes.
Data were collected between September 2024 and February 2025 using predefined inclusion and exclusion criteria. In total, 431 eligible thesis summaries were analyzed following Braun and Clarke's six-phase framework, supported by MAXQDA software for data management and coding.
Thematic analysis identified three overarching domains: (1) foundations of nursing practice and care philosophy, (2) systemic and organizational dimensions of nursing, and (3) clinical innovation and public health impact. Ten interrelated themes emerged, including holistic and patient-centred care; emotional, psychological, and quality-of-life dimensions; communication in healthcare; workforce challenges; transforming nursing practice; maternal, neonatal and pediatric health; digital and virtual health innovations; public health and chronic disease management; and disease management, caregiving, and outcomes. Cross-cutting elements such as cultural sensitivity and resilience spanned multiple themes.
This cross-national synthesis demonstrates the breadth and depth of doctoral nursing research in the Sigma Europe Region. Findings highlight nursing's pivotal role in addressing healthcare needs through innovative, person-centred, and evidence-informed solutions, and underscore the value of international collaboration in shaping resilient, equitable, and future-ready healthcare systems.
by Caio R. Monteiro, Victor Augusto de Oliveira, Rabeche Schmith, João Pedro A. Rezende, Tales L. Resende, João A. Negrão, Marina A. C. Danés
This study aimed to evaluate the effects of rumen-protected methionine (RPM) supplementation on productive and physiological responses of primiparous Holstein cows during summer. We hypothesized that RPM supplementation would maintain or improve milk yield and composition due to beneficial physiological, redox, and inflammatory responses in cows exposed to summer heat. The trial was conducted in a randomized block design during nine weeks in Brazil using 80 primiparous cows (182 ± 64 DIM; 42.9 ± 4.7 kg/d milk). Cows were blocked by milk yield and DIM and assigned to a control diet (CON; no added RPM) or the same diet supplemented with RPM (Mepron®, Evonik) at 0.75 g/kg diet dry matter, targeting 20 g/cow/day (product contains 62% metabolizable methionine) to the average cow. Milk yield and composition, vaginal temperature, respiratory rate, and plasma samples were collected in weeks 3, 6, and 9. Data were analyzed using mixed models including treatment, week, and their interaction as fixed effects, and block and cow as random effects. Cows were maintained under naturally occurring summer conditions. Environmental monitoring during weeks 3, 6, and 9 indicated elevated temperature–humidity index (THI) values, with values remaining above the heat-stress threshold (THI > 68) for 68.3% of the monitored hours (mean THI = 70.6; range 61.0–84.4). Overall (least squares mean across weeks 3, 6, and 9), RPM increased milk yield by 2.0 kg/d (44.9 vs. 42.9 kg/d), protein yield by 50 g/d (1,464 vs. 1,414 g/d), lactose yield by 108 g/d (2,109 vs. 2,001 g/d), and total solids yield by 176 g/d (5,331 vs. 5,155 g/d). Lactose concentration was lower in RPM (4.71 vs. 4.76%). Fat yield was unaffected, but a treatment × week interaction was observed for fat content. Milk fatty acid (FA) profile was unchanged, although treatment × week interactions were observed for individual fatty acids (C16:0, C18:0, C18:1, and preformed FA). Plasma glucose was lower, and insulin was higher in RPM than in CON cows (39.3 vs. 43.2 mg/dL and 0.52 vs. 0.35 ng/mL, respectively). Antioxidant capacity improved, with RPM cows having greater ferric reducing antioxidant power (32.9 vs. 28.5 µM) and lower malondialdehyde (2.48 vs. 2.78 nmol/mL). Other biochemical, inflammatory, and immune markers were unaffected. Respiratory rate was slightly higher in RPM than in CON cows (55 vs. 50 breaths/min). Mean vaginal temperature did not differ between treatments; however, a treatment × time × hour interaction was observed. Supplementation with RPM improved milk and solids yield, and enhanced antioxidant capacity and insulin levels, supporting its use to improve metabolic resilience under warm conditions.To explore and map the landscape of doctoral nursing research across eight countries.
A scoping review.
This review followed the Joanna Briggs Institute methodology for scoping reviews and included doctoral theses in nursing defended between 2020 and 2023 in Austria, Italy, Israel, the Netherlands, Poland, Portugal, Slovakia and the United Kingdom.
Searches were conducted across 15 national and university repositories (4 national, 11 university) in the eight participating countries.
This review included 431 doctoral nursing theses, the majority of which employed quantitative methodologies and focused on patient populations and healthcare professionals. Key topics included clinical nursing care, quality of care, quality of life, home care, perinatal care and the work environments.
Nursing doctoral research shows progress in healthcare delivery, patient care and education via digital tools, holistic approaches and professional development. Yet gaps persist in mental health, paediatrics and marginalised groups. Limited qualitative/mixed-methods research and weak interdisciplinary collaboration reveal further opportunities.
This review underscores that nursing doctoral research is addressing major healthcare and professional challenges. Nonetheless, the identified gaps emphasise the need for more comprehensive and inclusive research to enhance equity and guide future nursing practices and policies.
This review provides an overview of the scope of doctoral nursing research across eight countries, identifying key trends and research gaps. The findings are expected to inform nursing academia, policymakers, and healthcare professionals by guiding future research priorities, fostering interdisciplinary collaboration, and promoting equitable, patient-centred care practices.
No direct involvement in data collection; one lay reviewer gave feedback on readability and practice implications, informing minor refinements.
Non-communicable diseases (NCDs), such as diabetes, cardiovascular diseases and cancer, are major global public health concerns. Diet quality—particularly the consumption of ultra-processed foods—has been associated with increased risk of NCDs. Traditional cohort studies are often expensive and logistically complex. The NutriNet-Brasil cohort leverages a web-based approach, offering a cost-effective and practical solution for comprehensive data collection and long-term follow-up.
Recruitments began in January 2020 through mass media, social media campaigns and collaborations with health organisations. Eligible participants are adults (aged ≥18 years) living in Brazil with internet access. Participants complete self-administered online questionnaires covering dietary intake, health status and other health determinants. Dietary assessment is based on the Nova classification system, which categorises foods by their level of processing.
Over 88 000 participants have completed the initial questionnaire. The cohort is predominantly women (79.9%) and highly educated (67.9% had completed higher education). The web-based design enabled the development and application of innovative dietary assessment tools, including the Nova24h and the Nova24hScreener, specifically designed to evaluate food processing levels. These tools have shown good performance in capturing dietary patterns and are central to the cohort’s aim. The online platform facilitates efficient recruitment, data collection and participant retention.
NutriNet-Brasil is pioneering the development of web-based cohort methodologies and instruments tailored to food processing research. Future work includes leveraging collaborations with national and international research centres to conduct multidisciplinary analyses and inform public health policies.
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