Kjetil Søreide

University of Bergen, Bergen, Hordaland, Norway

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Publications (147)428.54 Total impact

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  • Kjetil Søreide
    Surgery 03/2015; DOI:10.1016/j.surg.2014.12.019 · 3.37 Impact Factor
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    ABSTRACT: Ruptured infrarenal abdominal aortic aneurysms (rAAAs) represent both a life-threatening emergency for the affected patient and a considerable health burden globally. The aim of this study was to investigate the contemporary epidemiology of rAAA in a defined Norwegian population for which both hospital and autopsy data were available. This was a retrospective, single-center population-based study of rAAA. The study includes all consecutively diagnosed prehospital and in-hospital cases of rAAA in the catchment area of Stavanger University Hospital between January 2000 and December 2012. Incidence and mortality rates (crude and adjusted) were calculated using national demographic data. A total of 216 patients with primary rAAA were identified. The adjusted incidence rate for the study period was 11.0 per 100,000 per year (95% confidence interval [CI], 9.6-12.5). Twenty patients died out of the hospital, and 144 of the 196 patients (73%) admitted to the hospital underwent surgery. The intervention rate varied from 48% to 81% during the study period. The adjusted mortality rate was 7.5 per 100,000 per year (95% CI, 6.3-8.8). No differences in the incidence and mortality rates were found in comparing early and late periods. The 90-day standardized mortality ratio for the study period was 37.2 (95% CI, 31.6-43.7). The overall 90-day mortality was 68% (146 of 216 persons) and 51% (74 of 144 persons) for the patients treated for rAAA. We found a stable incidence and mortality rate during a decade. The prehospital death rate was lower (9%), the intervention rate (73%) higher, and the total mortality (68%) lower than in most other studies. Geographic and regional differences may influence the epidemiologic description of rAAA and hence should be taken into consideration in comparing outcomes for in-hospital mortality and intervention rates. Copyright © 2015 Society for Vascular Surgery. Published by Elsevier Inc. All rights reserved.
    Journal of Vascular Surgery 02/2015; DOI:10.1016/j.jvs.2014.12.054 · 2.98 Impact Factor
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    Kjetil Søreide, Kari F Desserud
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    ABSTRACT: Becoming old is considered a privilege and results from the socioeconomic progress and improvements in health care systems worldwide. However, morbidity and mortality increases with age, and even more so in acute onset disease. With the current prospects of longevity, a considerable number of elderly patients will continue to live with good function and excellent quality of life after emergency surgical care. However, mortality in emergency surgery may be reported at 15-30%, doubled if associated with complications, and notably higher in patients over 75 years. A number of risks associated with death are reported, and a number of scores proposed for prediction of risk. Frailty, a decline in the physiological reserves that may make the person vulnerable to even the most minor of stressful event, appears to be a valid indicator and predictor of risk and poor outcome, but how to best address and measure frailty in the emergency setting is not clear. Futility may sometimes be clearly defined, but most often becomes a borderline decision between ethics, clinical predictions and patient communication for which no solid evidence currently exists. The number and severity of other underlying condition(s), as well as the treatment alternatives and their consequences, is a complex picture to interpret. Add in the onset of the acute surgical disease as a further potential detrimental factor on function and quality of life ¿ and you have a perfect storm to handle. In this brief review, some of the challenging aspects related to emergency surgery in the elderly will be discussed. More research, including registries and trials, are needed for improved knowledge to a growing health care challenge.
    Scandinavian Journal of Trauma Resuscitation and Emergency Medicine 02/2015; 23(1):10. DOI:10.1186/s13049-015-0099-x · 1.93 Impact Factor
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    Kjetil Søreide
    Scandinavian Journal of Trauma Resuscitation and Emergency Medicine 01/2015; 23(1):1. DOI:10.1186/s13049-014-0079-6 · 1.93 Impact Factor
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    ABSTRACT: Many studies on gastrointestinal stromal tumors (GISTs) derive from tertiary referral centers, but few examine strictly population-based cohorts. Thus, we evaluated the clinical features, surgical treatments, clinical outcomes, and factors predicting the survival of patients with GISTs in a population-based series. Patients with GISTs diagnosed at Stavanger University Hospital over three decades (1980-2012) were analyzed. Data were retrieved from hospital records. Descriptive statistics and survival analyses (Kaplan-Meier) are presented. A limited number of colorectal GISTs (n = 6) restricted most analyses to those with a gastric or small bowel location. Among 66 patients surgically treated for GISTs, 60 patients (91 %) had either a gastric or a small bowel localization. Females comprised 61 %. The median age at diagnosis was 63 (range, 15-88) years. Clinical symptoms were recorded in 43 patients (65 %). Complete tumor resection was achieved in 85 % of the patients. During follow-up, 6 patients were surgically treated for local recurrence or metastatic disease. The median follow-up time was 6.1 years. At last follow-up, 30 patients (46 %) were deceased, 10 of whom died from GISTs. The median overall survival was 10.4 years. For GISTs with a gastric or small bowel location, a 1- and 5-year disease-specific survival of 100 and 96 %, and a relapse-free survival of 96 and 78 % were observed. Male gender, incidental diagnosis, smaller tumor size, a low mitotic rate, an intact pseudocapsule, low-risk categorization, and an early stage were significantly associated with improved outcomes. Surgery in a low-volume, population-based setting yields enhanced long-term disease and recurrence-free survival for patients with GISTs of the stomach or small bowel. Incidental diagnosis, complete tumor resection, and low-risk categorization are good predictors of long-term prognosis.
    World Journal of Surgery 10/2014; 39(2). DOI:10.1007/s00268-014-2824-4 · 2.35 Impact Factor
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    ABSTRACT: Emergency abdominal surgery outcomes represent an internationally important marker of healthcare quality and capacity. In this study, a novel approach to investigating global surgical outcomes is proposed, involving collaborative methodology using 'snapshot' clinical data collection over a 2-week period. The primary aim is to identify internationally relevant, modifiable surgical practices (in terms of modifiable process, equipment and clinical management) associated with best care for emergency abdominal surgery.
    BMJ Open 10/2014; 4(10):e006239. DOI:10.1136/bmjopen-2014-006239 · 2.06 Impact Factor
  • Kjetil Søreide, Jon Kristian Narvestad
    Injury 09/2014; DOI:10.1016/j.injury.2014.05.002 · 2.46 Impact Factor
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    ABSTRACT: Colorectal cancer (CRC) is the third most common cancer worldwide. Survival is largely stage-dependant, guided by the tumor–node–metastases (TNM) system for TNM assessment. Histopathological evaluation, including assessment of lymph node status, is important for correct TNM staging. However, recent updates in the TNM system have resulted in controversy. A continued debate on definitions resulting in potential up- and downstaging of patients, which may obscure survival data, has led the investigators to investigate other or alternative staging tools. Consequently, additional prognostic factors have been searched for using the regular light microscopy. Among the factors evaluated by histopathology include the evaluation of tumor budding and stromal environment, angiogenesis, as well as involvement of the immune system (including the ‘Immunoscore’). We review the current role of histopathology, controversies in TNM-staging and suggested alternatives to better predict outcome for CRC patients in the era of genomic medicine.
    Scandinavian Journal of Gastroenterology 08/2014; 49(10). DOI:10.3109/00365521.2014.950692 · 2.33 Impact Factor
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    ABSTRACT: Background Since the introduction of uncemented hip implants, there has been a search for the best surface coating to enhance bone apposition in order to improve retention. The surface coating of the different stems varies between products. The aim was to assess the retention force and bone adaption in two differently coated stems in a weight-bearing goat model.Materials and methodsHydroxyapatite (HA) and electrochemically deposited calcium phosphate (CP; Bonit®) on geometrically comparable titanium-based femoral stems were implanted into 12 (CP group) and 35 (HA group) goats. The animal model included physiological loading of the implants for 6 months. The pull-out force of the stems was measured, and bone apposition was microscopically evaluated.ResultsAfter exclusion criteria were applied, the number of available goats was 4 in the CP group and 11 in the HA group. The CP-coated stems had significantly lower retention forces compared with the HA-coated ones after 6 months (CP median 47 N, HA median 1,696 N, p¿=¿0.003). Bone sections revealed a lower degree of bone apposition in the CP-coated stems, with more connective tissue in the bone/implant interface compared with the HA group.Conclusion In this study, HA had better bone apposition and needed greater pull-out force in loaded implants. The application of CP on the loaded titanium surface to enhance the apposition of bone is questioned.
    Journal of Orthopaedic Surgery and Research 08/2014; 9(1):69. DOI:10.1186/s13018-014-0069-4 · 1.58 Impact Factor
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    ABSTRACT: Patients with colorectal cancer have experienced remarkable progress in a range of surgical and oncologic management strategies over the past few years, with a corresponding improvement in survival. The KRAS mutation may be a biomarker of cancer biology and prognosis, but also reflects patient selection.
    Cancer 08/2014; 120(24). DOI:10.1002/cncr.28979 · 5.20 Impact Factor
  • K Søreide
    British Journal of Surgery 07/2014; 101(8):964-5. DOI:10.1002/bjs.9500 · 4.84 Impact Factor
  • Kjetil Søreide, Malin Sund
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    ABSTRACT: Pancreatic cancer remains one of the deadliest human cancers with little progress made in survival over the past decades, and 5-year survival usually below 5%. Despite this dismal scenario, progresses have been made in understanding of the underlying tumour biology through among other definition of precursor lesions, delineation of molecular pathways, and advances in genome-wide technology. Further, exploring the relationship between epidemiological risk factors involving metabolic features to that of an altered cancer metabolism may provide the foundation for new therapies. Here we explore how nutrients and caloric intake may influence the KRAS-driven ductal carcinogenesis through mediators of metabolic stress, including autophagy in presence of TP53, advanced glycation end products (AGE) and the receptors (RAGE) and ligands (HMGB1), as well as glutamine pathways, among others. Effective understanding the cancer metabolism mechanisms in pancreatic cancer may propose new ways of prevention and treatment.
    Cancer letters 04/2014; DOI:10.1016/j.canlet.2014.03.028 · 5.02 Impact Factor
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    M M C Watson, M Berg, K Søreide
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    ABSTRACT: Elevated microsatellite alterations at selected tetranucleotides (EMAST), a variation of microsatellite instability (MSI), has been reported in a variety of malignancies (e.g., neoplasias of the lung, head and neck, colorectal region, skin, urinary tract and reproductive organs). EMAST is more prominent at organ sites with potential external exposure to carcinogens (e.g., head, neck, lung, urinary bladder and colon), although the specific molecular mechanisms leading to EMAST remain elusive. Because it is often associated with advanced stages of malignancy, EMAST may be a consequence of rapid cell proliferation and increased mutagenesis. Moreover, defects in DNA mismatch repair enzyme complexes, TP53 mutation status and peritumoural inflammation involving T cells have been described in EMAST tumours. At various tumour sites, EMAST and high-frequency MSI share no clinicopathological features or molecular mechanisms, suggesting their existence as separate entities. Thus EMAST should be explored, because its presence in human cells may reflect both increased risk and the potential for early detection. In particular, the potential use of EMAST in prognosis and prediction may yield novel types of therapeutic intervention, particularly those involving the immune system. This review will summarise the current information concerning EMAST in cancer to highlight the knowledge gaps that require further research.British Journal of Cancer advance online publication, 1 April 2014; doi:10.1038/bjc.2014.167 www.bjcancer.com.
    British Journal of Cancer 04/2014; DOI:10.1038/bjc.2014.167 · 5.08 Impact Factor
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    ABSTRACT: Mortality rates in perforated peptic ulcer (PPU) have remained unchanged. The aim of this study was to compare known clinical factors and three scoring systems (American Society of Anesthesiologists (ASA), Boey and peptic ulcer perforation (PULP)) in the ability to predict mortality in PPU. This is a consecutive, observational cohort study of patients surgically treated for perforated peptic ulcer over a decade (January 2001 through December 2010). Primary outcome was 30-day mortality. A total of 172 patients were included, of whom 28 (16 %) died within 30 days. Among the factors associated with mortality, the PULP score had an odds ratio (OR) of 18.6 and the ASA score had an OR of 11.6, both with an area under the curve (AUC) of 0.79. The Boey score had an OR of 5.0 and an AUC of 0.75. Hypoalbuminaemia alone (≤37 g/l) achieved an OR of 8.7 and an AUC of 0.78. In multivariable regression, mortality was best predicted by a combination of increasing age, presence of active cancer and delay from admission to surgery of >24 h, together with hypoalbuminaemia, hyperbilirubinaemia and increased creatinine values, for a model AUC of 0.89. Six clinical factors predicted 30-day mortality better than available risk scores. Hypoalbuminaemia was the strongest single predictor of mortality and may be included for improved risk estimation.
    Journal of Gastrointestinal Surgery 03/2014; 18(7). DOI:10.1007/s11605-014-2485-5 · 2.36 Impact Factor
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    Hanne R Hagland, Kjetil Søreide
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    ABSTRACT: The interconnectivity between diet, gut microbiota and cell molecular responses is well known; however, only recently has technology allowed the identification of strains of microorganisms harbored in the gastrointestinal tract that may increase susceptibility to cancer. The colonic environment appears to play a role in the development of colon cancer, which is influenced by the human metabolic lifestyle and changes in the gut microbiome. Studying metabolic changes at the cellular level in cancer be useful for developing novel improved preventative measures, such as screening through metabolic breath-tests or treatment options that directly affect the metabolic pathways responsible for the carcinogenicity.
    Cancer letters 03/2014; DOI:10.1016/j.canlet.2014.02.026 · 5.02 Impact Factor
  • K Søreide
    British Journal of Surgery 03/2014; 101(4):438. DOI:10.1002/bjs.9459 · 4.84 Impact Factor
  • K. Søreide, K. Thorsen, J. A. Søreide
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    ABSTRACT: Mortality prediction models for patients with perforated peptic ulcer (PPU) have not yielded consistent or highly accurate results. Given the complex nature of this disease, which has many non-linear associations with outcomes, we explored artificial neural networks (ANNs) to predict the complex interactions between the risk factors of PPU and death among patients with this condition. ANN modelling using a standard feed-forward, back-propagation neural network with three layers (i.e., an input layer, a hidden layer and an output layer) was used to predict the 30-day mortality of consecutive patients from a population-based cohort undergoing surgery for PPU. A receiver-operating characteristic (ROC) analysis was used to assess model accuracy. Of the 172 patients, 168 had their data included in the model; the data of 117 (70 %) were used for the training set, and the data of 51 (39 %) were used for the test set. The accuracy, as evaluated by area under the ROC curve (AUC), was best for an inclusive, multifactorial ANN model (AUC 0.90, 95 % CIs 0.85-0.95; p < 0.001). This model outperformed standard predictive scores, including Boey and PULP. The importance of each variable decreased as the number of factors included in the ANN model increased. The prediction of death was most accurate when using an ANN model with several univariate influences on the outcome. This finding demonstrates that PPU is a highly complex disease for which clinical prognoses are likely difficult. The incorporation of computerised learning systems might enhance clinical judgments to improve decision making and outcome prediction.
    European Journal of Trauma and Emergency Surgery 02/2014; 41(1):91-98. DOI:10.1007/s00068-014-0417-4 · 0.38 Impact Factor
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    Marianne Berg, Hanne R Hagland, Kjetil Søreide
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    ABSTRACT: In colorectal cancer a distinct subgroup of tumours demonstrate the CpG island methylator phenotype (CIMP). However, a consensus of how to score CIMP is not reached, and variation in definition may influence the reported CIMP prevalence in tumours. Thus, we sought to compare currently suggested definitions and cut-offs for methylation markers and how they influence CIMP classification in colon cancer. Methylation-specific multiplex ligation-dependent probe amplification (MS-MLPA), with subsequent fragment analysis, was used to investigate methylation of tumour samples. In total, 31 CpG sites, located in 8 different genes (RUNX3, MLH1, NEUROG1, CDKN2A, IGF2, CRABP1, SOCS1 and CACNA1G) were investigated in 64 distinct colon cancers and 2 colon cancer cell lines. The Ogino gene panel includes all 8 genes, in addition to the Weisenberger panel of which only 5 of the 8 genes included were investigated. In total, 18 alternative combinations of scoring of CIMP positivity on probe-, gene-, and panel-level were analysed and compared. For 47 samples (71%), the CIMP status was constant and independent of criteria used for scoring; 34 samples were constantly scored as CIMP negative, and 13 (20%) consistently scored as CIMP positive. Only four of 31 probes (13%) investigated showed no difference in the numbers of positive samples using the different cut-offs. Within the panels a trend was observed that increasing the gene-level stringency resulted in a larger difference in CIMP positive samples than increasing the probe-level stringency. A significant difference between positive samples using 'the most stringent' as compared to 'the least stringent' criteria (20% vs 46%, respectively; p<0.005) was demonstrated. A statistical significant variation in the frequency of CIMP depending on the cut-offs and genes included in a panel was found, with twice as many positives samples by least compared to most stringent definition used.
    PLoS ONE 01/2014; 9(1):e86657. DOI:10.1371/journal.pone.0086657 · 3.53 Impact Factor
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    K Søreide, K Thorsen, J A Søreide
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    ABSTRACT: Perforated peptic ulcer (PPU) is a common surgical emergency that carries high mortality and morbidity rates. Globally, one-quarter of a million people die from peptic ulcer disease each year. Strategies to improve outcomes are needed. PubMed was searched for evidence related to the surgical treatment of patients with PPU. The clinical registries of trials were examined for other available or ongoing studies. Randomized clinical trials (RCTs), systematic reviews and meta-analyses were preferred. Deaths from peptic ulcer disease eclipse those of several other common emergencies. The reported incidence of PPU is 3·8-14 per 100 000 and the mortality rate is 10-25 per cent. The possibility of non-operative management has been assessed in one small RCT of 83 patients, with success in 29 (73 per cent) of 40, and only in patients aged less than 70 years. Adherence to a perioperative sepsis protocol decreased mortality in a cohort study, with a relative risk (RR) reduction of 0·63 (95 per cent confidence interval (c.i.) 0·41 to 0·97). Based on meta-analysis of three RCTs (315 patients), laparoscopic and open surgery for PPU are equivalent, but patient selection remains a challenge. Eradication of Helicobacter pylori after surgical repair of PPI reduces both the short-term (RR 2·97, 95 per cent c.i. 1·06 to 8·29) and 1-year (RR 1·49, 1·10 to 2·03) risk of ulcer recurrence. Mortality and morbidity from PPU can be reduced by adherence to perioperative strategies.
    British Journal of Surgery 01/2014; 101(1):e51-64. DOI:10.1002/bjs.9368 · 4.84 Impact Factor

Publication Stats

1k Citations
428.54 Total Impact Points


  • 2007–2015
    • University of Bergen
      • • Department of Clinical Medicine
      • • Department of Surgical Sciences
      • • The Gade Institute
      Bergen, Hordaland, Norway
  • 2005–2014
    • Stavanger University Hospital
      • • Department of Gastrointestinal Surgery
      • • Division of Surgery
      • • Department of Pathology
      Stavenger, Rogaland, Norway
  • 2011
    • Harvard University
      Cambridge, Massachusetts, United States
  • 2010
    • University Hospital of North Norway
      • Department of Gastroenterological Surgery
      Tromsø, Troms, Norway
  • 2009
    • University College Dublin
      Dublin, Leinster, Ireland
    • University of Oslo
      • Faculty of Medicine
      Kristiania (historical), Oslo, Norway
  • 2007–2009
    • University of Stavanger (UiS)
      • Department of Mathematics and Natural Science
      Stavenger, Rogaland, Norway