Academic article

• Kjetil Søreide; Kenneth Thorsen; Ewen M. Harrison et al. (2015). Perforated peptic ulcer. (external link)
• Kjetil Søreide; Kenneth Thorsen; Jon Arne Søreide (2016). Clinical patterns of presentation and attenuated inflammatory response in octo- and nonagenarians with perforated gastroduodenal ulcers.. (external link)
• Johannes Wiik Larsen; Kjetil Søreide; Jon Arne Søreide et al. (2022). Epidemiology of abdominal trauma: An age- and sex-adjusted incidence analysis with mortality patterns. (external link)
• Kenneth Thorsen; Tom Glomsaker; Andreas Von Meer et al. (2011). Trends in diagnosis and surgical management of patients with perforated peptic ulcer. (external link)
• Arezo Kanani; Torhild Veen; Dordi Lea et al. (2024). Neoadjuvant Immunotherapy Followed by Surgery Compared with Upfront Surgery Alone in Operable Colon Cancer with Deficient Mismatch Repair: Modeling Oncological Outcomes and Numbers Needed to Treat. (external link)
• Kenneth Thorsen; Jon Arne Søreide; Kjetil Søreide (2014). What is the best predictor of mortality in perforated peptic ulcer disease? A population-based, multivariable regression analysis including three clinical scoring systems. (external link)
• Clemens Weber; David Andreas Thomas Werner; Kenneth Thorsen et al. (2022). Health Care Implications of the COVID-19 Pandemic for Patients with Severe Traumatic Brain Injury—A Nationwide, Observational Cohort Study. (external link)
• Johannes Wiik Larsen; Kenneth Thorsen; Kjetil Søreide (2023). Splenic injury from blunt trauma. (external link)
• Kjetil Søreide; Benedicte Skjold-Ødegaard; Kenneth Thorsen et al. (2021). Adhesions after open and laparoscopic abdominal surgery. (external link)
• Thomas M. Drake; J. Edward F Fitzgerald; Dan Poenaru et al. (2016). Determinants of morbidity and mortality following emergency abdominal surgery in children in low-income and middle-income countries. (external link)
• Joakim Stray Andreassen; Kenneth Thorsen; Kjetil Søreide et al. (2022). Is there a weekend effect on mortality rate and outcome for moderate and severe traumatic brain injury? A population-based, observational cohort study. (external link)
• Ewen M. Harrison; N. Gobin; A.V. Freitas et al. (2024). Development and external validation of the 'Global Surgical-Site Infection' (GloSSI) predictive model in adult patients undergoing gastrointestinal surgery. (external link)
• Clemens Weber; Joakim Stray Andreassen; Siobhan Isles et al. (2022). Incidence, Mechanisms of Injury and Mortality of Severe Traumatic Brain Injury: An Observational Population-Based Cohort Study from New Zealand and Norway. (external link)
• Hannah S. Thomas; Thomas G. Weiser; Thomas M. Drake et al. (2019). Pooled analysis of WHO Surgical Safety Checklist use and mortality after emergency laparotomy. (external link)
• Kenneth Thorsen; Pieter Oord; Jon Narvestad et al. (2025). Demography, emergency interventions and outcome after severe pelvic injuries: a two-decade registry study from South- Western Norway. (external link)
• Anna Reuter; Lisa Rogge; Mark Monahan et al. (2022). Global economic burden of unmet surgical need for appendicitis. (external link)
• Johannes Wiik Larsen; Kjetil Søreide; Jon Arne Søreide et al. (2026). Epidemiological trends in abdominal trauma in Norway (2015–2023): a national register-based cohort study of severity, population-adjusted incidence, and short-term outcomes. (external link)
• Trym Nossum Kolstø; David Andreas Thomas Werner; Kenneth Thorsen et al. (2025). Pediatric moderate and severe traumatic brain injury – A national, population-based cohort study. (external link)
• Kenneth Thorsen; Morten Vetrhus; Jon Narvestad et al. (2020). Performance and outcome evaluation of emergency resuscitative thoracotomy in a Norwegian trauma centre: a population-based consecutive series with survival benefits. (external link)
• Kenneth Thorsen; Jon Arne Søreide; Kjetil Søreide (2016). Long-term mortality in patients operated for perforated peptic ulcer: factors limiting longevity are dominated by older age, comorbidity burden and severe postoperative complications. (external link)
• Kenneth Thorsen; Jon Narvestad; Kjell Egil Tjosevik et al. (2021). Changing from a two-tiered to a one-tiered trauma team activation protocol: a before–after observational cohort study investigating the clinical impact of undertriage. (external link)
• Clemens Weber; Joakim Stray Andreassen; MAZIAR BEHBAHANI et al. (2022). Characteristics, image findings and clinical outcome of moderate and severe traumatic brain injury among severely injured children: a population-based cohort study. (external link)
• Johannes Wiik Larsen; Kenneth Thorsen; Knut Olav Lende Sandve et al. (2020). Incidence and characteristics of pancreatic injuries among trauma patients admitted to a Norwegian trauma centre: a population-based cohort study. (external link)
• James C. Glasbey; Adewale O. Adisa; Ainhoa Costas-Chavarri et al. (2019). Global variation in anastomosis and end colostomy formation following left-sided colorectal resection.. (external link)
• Kjetil Søreide; Kenneth Thorsen; Jon Arne Søreide (2014). Predicting outcomes in patients with perforated gastroduodenal ulcers: artificial neural network modelling indicates a highly complex disease. (external link)
• Martine Alstveit Årsland; Clemens Weber; Cathrine Harstad Enoksen et al. (2024). Characteristics and demography of low energy fall injuries in patients > 60 years of age: a population-based analysis over a decade with focus on undertriage. (external link)
• Maryam Meshkinfamfard; Jon Narvestad; Johannes Wiik Larsen et al. (2021). Structured and systematic team and procedure training in severe trauma: Going from ‘Zero to Hero’ for a time-critical, low-volume emergency procedure over three time periods. (external link)
• Gunnar Velde; Warsan Ismail; Kenneth Thorsen (2024). Perforated peptic ulcer. (external link)
• Kenneth Thorsen; Jon Arne Søreide; Jan Terje Kvaløy et al. (2013). Epidemiology of perforated peptic ulcer: Age- and gender-adjusted analysis of incidence and mortality. (external link)
• Guro Bjørke Buljo; Ingvild Dalen; Kenneth Thorsen (2025). Accuracy of the Norwegian trauma protocol. An observational population study from South-Western Norway. (external link)
• Kjetil Søreide; Clemens Weber; Kenneth Thorsen (2020). Priorities for research in trauma care: creating a bucket list. (external link)

Letter to the editor

• Kjetil Søreide; Benedicte Skjold-Ødegaard; Kenneth Thorsen et al. (2021). Adhesions after open and laparoscopic abdominal surgery. (external link)

Conference lecture

• Martine A. Årsland; Cathrine Harstad Enoksen; Ingvild Dalen et al. (2023). Characteristics and demography of low energy fall injuries in the geriatric trauma population over a decade. (external link)
• Martine A. Årsland; Cathrine Harstad Enoksen; Ingvild Dalen et al. (2022). CHARACTERISTICS AND DEMOGRAPHY OF LOW ENERGY FALL INJURIES IN THE GERIATRIC TRAUMA POPULATION OVER A DECADE. (external link)
• Joakim Stray Andreassen; David Andreas Thomas Werner; Kenneth Thorsen et al. (2022). The effects of reduced clinical activity on mortality in moderate and severe traumatic brain injury – an observational cohort study. (external link)

Conference poster

• Martine A. Årsland; Arezo Kanani; Hans Erik Birkeland et al. (2023). Fast track CT scan and geriatric trauma team as a first line treatment of elderly patients with low energy fall and head injury. (external link)

Doctoral thesis (PhD)

• Kenneth Thorsen (2014). Perforated peptic ulcer; epidemiology, management and outcome prediction. (external link)

Academic literature review

• Kjetil Søreide; Kenneth Thorsen; Jon Arne Søreide (2014). Strategies to improve the outcome of emergency surgery for perforated peptic ulcer. (external link)
• Kenneth Thorsen; Jon Arne Søreide; Kjetil Søreide (2013). Scoring systems for outcome prediction in patients with perforated peptic ulcer. (external link)
• Kenneth Thorsen; Kjetil G. Ringdal; Kristian Strand et al. (2011). Clinical and cellular effects of hypothermia, acidosis and coagulopathy in major injury. (external link)

Journal corrigendum

• Arezo Kanani; Torhild Veen; Dordi Lea et al. (2025). Correction to: Neoadjuvant Immunotherapy Followed by Surgery Compared with Upfront Surgery Alone in Operable Colon Cancer with Deficient Mismatch Repair: Modeling Oncological Outcomes and Numbers Needed to Treat (Annals of Surgical Oncology, (2024), 10.1245/s10434-024-16755-y). (external link)

See a complete overview of publications in NVA.