Publications 2021

Aghayan DL, Kazaryan AM, Fretland AA, Rosok B, Barkhatov L, Lassen K, Edwin B (2021)
Evolution of laparoscopic liver surgery: 20-year experience of a Norwegian high-volume referral center
Surg. Endosc.
DOI 10.1007/s00464-021-08570-3

Kryeziu K, Moosavi SH, Bergsland CH, Guren MG, Eide PW, Totland MZ, Lassen K, Abildgaard A, Nesbakken A, Sveen A, Lothe RA (2021)
Increased sensitivity to SMAC mimetic LCL161 identified by longitudinal ex vivo pharmacogenomics of recurrent, KRAS mutated rectal cancer liver metastases
J. Transl. Med., 19 (1), 384
DOI 10.1186/s12967-021-03062-3

Labori KJ, Tholfsen T, Yaqub S, Lassen K, Kleive D, Waage A (2021)
Gastro- or Duodenojejunostomy Leaks After Pancreatoduodenectomy: Single Center Experience and Narrative Literature Review
J. Gastrointest. Surg., 25 (12), 3130-3136
DOI 10.1007/s11605-021-05058-2

Sahakyan MA, Verbeke CS, Tholfsen T, Ignjatovic D, Kleive D, Buanes T, Lassen K, Rosok BI, Labori KJ, Edwin B (2021)
Prognostic Impact of Resection Margin Status in Distal Pancreatectomy for Ductal Adenocarcinoma
Ann. Surg. Oncol.
DOI 10.1245/s10434-021-10464-6

Sahakyan MA, Verbeke CS, Tholfsen T, Ignjatovic D, Kleive D, Buanes T, Lassen K, Rosok BI, Labori KJ, Edwin B (2021)
ASO Visual Abstract: Prognostic Impact of Resection Margin Status in Distal Pancreatectomy for Ductal Adenocarcinoma
Ann. Surg. Oncol., 28 (SUPPL 3 3), 570
DOI 10.1245/s10434-021-10531-y

Publications 2020

Bjorlykke KH, Eftang LL, Grzyb K, Line PD, Lassen K, Jahnsen J (2020)
A man in his 50s with abdominal pain, itching and weight loss
Tidsskr. Nor. Laegeforen., 140 (3), 268-272

Melloul E, Lassen K, Roulin D, Grass F, Perinel J, Adham M, Wellge EB, Kunzler F, Besselink MG, Asbun H, Scott MJ, Dejong CHC, Vrochides D, Aloia T, Izbicki JR, Demartines N (2020)
Guidelines for Perioperative Care for Pancreatoduodenectomy: Enhanced Recovery After Surgery (ERAS) Recommendations 2019
World J.Surg., 44 (7), 2056-2084
DOI 10.1007/s00268-020-05462-w

Nymo LS, Kleive D, Waardal K, Bringeland EA, Soreide JA, Labori KJ, Mortensen KE, Soreide K, Lassen K (2020)
Centralizing a national pancreatoduodenectomy service: striking the right balance
BJS Open, 4 (5), 904-913
DOI 10.1002/bjs5.50342

Skeie E, Tangvik RJ, Nymo LS, Harthug S, Lassen K, Viste A (2020)
Weight loss and BMI criteria in GLIM's definition of malnutrition is associated with postoperative complications following abdominal resections - Results from a National Quality Registry
Clin. Nutr., 39 (5), 1593-1599
DOI 10.1016/j.clnu.2019.07.003

Publications 2019

Brudvik KW, Yaqub S, Kemsley E, Coolsen MME, Dejong CHC, Wigmore SJ, Lassen K (2019)
Survey of the attitudes of hepatopancreatobiliary surgeons in northern Europe to resection of choledochal cysts in asymptomatic Western adults
BJS Open, 3 (6), 785-792
DOI 10.1002/bjs5.50208

Kleive D, Sahakyan MA, Labori KJ, Lassen K (2019)
Nasogastric Tube on Demand is Rarely Necessary After Pancreatoduodenectomy Within an Enhanced Recovery Pathway
World J.Surg., 43 (10), 2616-2622
DOI 10.1007/s00268-019-05045-4

Lassen K, Nymo LS, Olsen F, Brudvik KW, Fretland AA, Soreide K (2019)
Contemporary practice and short-term outcomes after liver resections in a complete national cohort
Langenbecks Arch. Surg., 404 (1), 11-19
DOI 10.1007/s00423-018-1737-3

Nymo LS, Norderval S, Eriksen MT, Wasmuth HH, Korner H, Bjornbeth BA, Moger T, Viste A, Lassen K (2019)
Short-term outcomes after elective colon cancer surgery: an observational study from the Norwegian registry for gastrointestinal and HPB surgery, NoRGast
Surg. Endosc., 33 (9), 2821-2833
DOI 10.1007/s00464-018-6575-4

Nymo LS, Soreide K, Kleive D, Olsen F, Lassen K (2019)
The effect of centralization on short term outcomes of pancreatoduodenectomy in a universal health care system
HPB, 21 (3), 319-327
DOI 10.1016/j.hpb.2018.08.011

Soreide K, Nymo LS, Kleive D, Olsen F, Lassen K (2019)
Variation in use of open and laparoscopic distal pancreatectomy and associated outcome metrics in a universal health care system
Pancreatology, 19 (6), 880-887
DOI 10.1016/j.pan.2019.07.047

Soreide K, Nymo LS, Lassen K (2019)
Centralization of Pancreatic Surgery in Europe: an Update
J. Gastrointest. Surg., 23 (11), 2322-2323
DOI 10.1007/s11605-019-04383-x

Soreide K, Olsen F, Nymo LS, Kleive D, Lassen K (2019)
A nationwide cohort study of resection rates and short-term outcomes in open and laparoscopic distal pancreatectomy
HPB, 21 (6), 669-678
DOI 10.1016/j.hpb.2018.10.006

Publications 2018

Lassen K (2018)
Drain After Pancreatoduodenectomy: Methodological Issues
Ann. Surg., 267 (3), E58
DOI 10.1097/SLA.0000000000002103

Lassen K, Nymo LS, Korner H, Thon K, Grindstein T, Wasmuth HH, Moger T, Bjornbeth BA, Norderval S, Eriksen MT, Viste A (2018)
The New National Registry for Gastrointestinal Surgery in Norway: NoRGast
Scand. J. Surg., 107 (3), 201-207
DOI 10.1177/1457496918766697

Lassen K, Nymo LS, Olsen F, Soreide K (2018)
Benchmarking of aggregated length of stay after open and laparoscopic surgery for cancers of the digestive system
BJS Open, 2 (4), 246-253
DOI 10.1002/bjs5.67

Nymo LS, Aabakken L, Lassen K (2018)
Priority and prejudice: does low socioeconomic status bias waiting time for endoscopy? A blinded, randomized survey
Scand. J. Gastroenterol., 53 (5), 621-625
DOI 10.1080/00365521.2017.1402207

Publications 2017

Giske A, Nymo LS, Fuskevag OM, Amundsen S, Simonsen GS, Lassen K (2017)
Systemic antibiotic prophylaxis prior to gastrointestinal surgery - is oral administration of doxycycline and metronidazole adequate?
Infect. Dis., 49 (11-12), 785-791
DOI 10.1080/23744235.2017.1342044

Labori KJ, Lassen K, Hoem D, Gronbech JE, Soreide JA, Mortensen K, Smaaland R, Sorbye H, Verbeke C, Dueland S (2017)
Neoadjuvant chemotherapy versus surgery first for resectable pancreatic cancer (Norwegian Pancreatic Cancer Trial-1 (NorPACT-1)) - study protocol for a national multicentre randomized controlled trial
BMC Surg., 17, 94
DOI 10.1186/s12893-017-0291-1

Lassen K, Bjornbeth BA, Line PD, Abildgaard A, Soreide JA, Mortensen K, Gronbech JE, Bringeland E, Horn A (2017)
Trump's ban on colleagues from Islamic countries
Lancet, 389 (10071), 804
DOI 10.1016/S0140-6736(17)30323-9

Aahlin EK, Trano G, Johns N, Horn A, Soreide JA, Fearon KC, Revhaug A, Lassen K (2017)
HEALTH-RELATED QUALITY OF LIFE, CACHEXIA AND OVERALL SURVIVAL AFTER MAJOR UPPER ABDOMINAL SURGERY: A PROSPECTIVE COHORT STUDY
Scand. J. Surg., 106 (1), 40-46
DOI 10.1177/1457496916645962

Publications 2016

Aahlin EK, Olsen F, Uleberg B, Jacobsen BK, Lassen K (2016)
Major postoperative complications are associated with impaired long-term survival after gastro-esophageal and pancreatic cancer surgery: a complete national cohort study
BMC Surg., 16, 32
DOI 10.1186/s12893-016-0149-y

Publications 2015

Currie A, Burch J, Jenkins JT, Faiz O, Kennedy RH, Ljungqvist O, Demartines N, Hjern F, Norderval S, Lassen K, Revhaug A, Koczkas T, Nygren J, Gustafsson U, Kornfeld D, Slim K, Hill A, Soop M, Carlander J, Lundberg O, Fearon K, Kennedy R, Jenkins JT, ERAS Compliance Grp (2015)
The Impact of Enhanced Recovery Protocol Compliance on Elective Colorectal Cancer Resection Results From an International Registry
Ann. Surg., 261 (6), 1153-1159
DOI 10.1097/SLA.0000000000001029

Hughes M, Coolsen MME, Aahlin EK, Harrison EM, McNally SJ, Dejong CHC, Lassen K, Wigmore SJ (2015)
Attitudes of patients and care providers to enhanced recovery after surgery programs after major abdominal surgery
J. Surg. Res., 193 (1), 102-110
DOI 10.1016/j.jss.2014.06.032

Lassen K, Dejong CH, Revhaug A, Fearon K, Lobo DN, Ljungqvist O (2015)
Food at will after pancreaticoduodenectomies. Re. "Perioperative nutritional support of patients undergoing pancreatic surgery in the age of ERAS"
Nutrition, 31 (7-8), 1057-1058
DOI 10.1016/j.nut.2015.02.013

Aahlin EK, Trano G, Johns N, Horn A, Soreide JA, Fearon KC, Revhaug A, Lassen K (2015)
Risk factors, complications and survival after upper abdominal surgery: a prospective cohort study
BMC Surg., 15, 83
DOI 10.1186/s12893-015-0069-2

Publications 2014

Lassen K, Mortensen K, Griffiths E, Johna S, Nilsson M (2014)
Huge effect of arginine on survival in gastric cancer?
J. Cancer Res. Clin. Oncol., 140 (4), 685
DOI 10.1007/s00432-014-1608-4

Mortensen K, Nilsson M, Slim K, Schafer M, Mariette C, Braga M, Carli F, Demartines N, Griffin SM, Lassen K, Enhanced Recovery After Surg ERAS (2014)
Consensus guidelines for enhanced recovery after gastrectomy Enhanced Recovery After Surgery (ERAS (R)) Society recommendations
Br. J. Surg., 101 (10), 1209-1229
DOI 10.1002/bjs.9582

Patel HRH, Cerantola Y, Valerio M, Persson B, Jichlinski P, Ljungqvist O, Hubner M, Kassouf W, Muller S, Baldini G, Carli F, Naesheim T, Ytrebo L, Revhaug A, Lassen K, Knutsen T, Aarsaether E, Wiklund P, Catto JWF (2014)
Enhanced Recovery After Surgery: Are We Ready, and Can We Afford Not to Implement These Pathways for Patients Undergoing Radical Cystectomy?
Eur. Urol., 65 (2), 263-266
DOI 10.1016/j.eururo.2013.10.011

Aahlin EK, von Meyenfeldt M, Dejong CHC, Ljungqvist O, Fearon KC, Lobo DN, Demartines N, Revhaug A, Wigmore SJ, Lassen K, Enhanced Recovery Surg ERAS Grp (2014)
Functional recovery is considered the most important target: a survey of dedicated professionals
Perioperative Med, 3, 5
DOI 10.1186/2047-0525-3-5

Publications 2013

Cerantola Y, Valerio M, Persson B, Jichlinski P, Ljungqvist O, Hubner M, Kassouf W, Muller S, Baldini G, Carli F, Naesheimh T, Ytrebo L, Revhaug A, Lassen K, Knutsen T, Aarsether E, Wiklund P, Patel HRH (2013)
Guidelines for perioperative care after radical cystectomy for bladder cancer: Enhanced Recovery After Surgery (ERAS (R)) society recommendations
Clin. Nutr., 32 (6), 879-887
DOI 10.1016/j.clnu.2013.09.014

Coolsen M, van Dam RM, van der Wilt AA, Slim K, Lassen K, Dejong C (2013)
Systematic Review and Meta-analysis of Enhanced Recovery After Pancreatic Surgery with Particular Emphasis on Pancreaticoduodenectomies
World J.Surg., 37 (8), 1909-1918
DOI 10.1007/s00268-013-2044-3

Coolsen MME, Wong-Lun-Hing EM, van Dam RM, van der Wilt AA, Slim K, Lassen K, Dejong CHC (2013)
A systematic review of outcomes in patients undergoing liver surgery in an enhanced recovery after surgery pathways
HPB, 15 (4), 245-251
DOI 10.1111/j.1477-2574.2012.00572.x

Fearon KC, Jenkins JT, Carli F, Lassen K (2013)
Patient optimization for gastrointestinal cancer surgery
Br. J. Surg., 100 (1), 15-27
DOI 10.1002/bjs.8988

Lassen K, Coolsen MME, Slim K, Carli F, de Aguilar-Nascimento JE, Schafer M, Parks RW, Fearon KCH, Lobo DN, Demartines N, Braga M, Ljungqvist O, Dejong CHC (2013)
Guidelines for Perioperative Care for Pancreaticoduodenectomy: Enhanced Recovery After Surgery (ERAS((R))) Society Recommendations
World J.Surg., 37 (2), 240-258
DOI 10.1007/s00268-012-1771-1

Lassen K, Ljungqvist O (2013)
Pancreaticoduodenectomy: ERAS recommendations
Clin. Nutr., 32 (5), 870-871
DOI 10.1016/j.clnu.2013.04.019

Publications 2012

Augestad KM, Berntsen G, Lassen K, Bellika JG, Wootton R, Lindsetmo RO, Study Grp Res Quality Med (2012)
Standards for reporting randomized controlled trials in medical informatics: a systematic review of CONSORT adherence in RCTs on clinical decision support
J. Am. Med. Inf. Assoc., 19 (1), 13-21
DOI 10.1136/amiajnl-2011-000411

Lassen K, Coolsen MME, Slim K, Carli F, de Aguilar-Nascimento JE, Schafer M, Parks RW, Fearon KCH, Lobo DN, Demartines N, Braga M, Ljungqvist O, Dejong CHC, ERAS Soc European Soc Clinical Nutr Metab Int Assoc Surgical Metab (2012)
Guidelines for perioperative care for pancreaticoduodenectomy: Enhanced Recovery After Surgery (ERAS (R)) Society recommendations
Clin. Nutr., 31 (6), 817-830
DOI 10.1016/j.clnu.2012.08.011

Lassen K, Hoye A, Myrmel T (2012)
Randomised Trials in Surgery: The Burden of Evidence
Rev. Recent Clin. Trials, 7 (3), 244-248
DOI 10.2174/157488712802281402

van Dam RM, Wong-Lun-Hing EM, Van Breukelen GJP, Stoot JHMB, van der Vorst JR, Bemelmans MHA, Damink SWMO, Lassen K, Dejong CHC, Orange II Study Grp (2012)
Open versus laparoscopic left lateral hepatic sectionectomy within an enhanced recovery ERAS (R) programme (ORANGE II - Trial): study protocol for a randomised controlled trial
Trials, 13, 54
DOI 10.1186/1745-6215-13-54

Publications 2010

Lassen K, Lobo DN (2010)
Randomized controlled trial of preoperative oral carbohydrate treatment in major abdominal surgery (Br J Surg 2010; 97: 485-494)
Br. J. Surg., 97 (4), 494-495
DOI 10.1002/bjs.7049

Publications 2009

Hendry PO, Hansel J, Nygren J, Lassen K, Dejong CHC, Ljungqvist O, Fearon KCH, Enhanced Recovery Surg ERAS Study (2009)
Determinants of outcome after colorectal resection within an enhanced recovery programme
Br. J. Surg., 96 (2), 197-205
DOI 10.1002/bjs.6445

Lassen K (2009)
Intravenous fluid therapy
Br. J. Surg., 96 (2), 123-124
DOI 10.1002/bjs.6466

Lassen K, Soop M, Nygren J, Cox PBW, Hendry PO, Spies C, von Meyenfeldt MF, Fearon KCH, Revhaug A, Norderval S, Ljungqvist O, Lobo DN, Dejong CHC, ERAS Grp (2009)
Consensus Review of Optimal Perioperative Care in Colorectal Surgery Enhanced Recovery After Surgery (ERAS) Group Recommendations
Arch. Surg., 144 (10), 961-969
DOI 10.1001/archsurg.2009.170

Publications 2008

Lassen K, Kjaeve J, Fetveit T, Trano G, Sigurdsson HK, Horn A, Revhaug A (2008)
Allowing normal food at will after major upper gastrointestinal surgery does not increase morbidity - A randomized multicenter trial
Ann. Surg., 247 (5), 721-729
DOI 10.1097/SLA.0b013e31815cca68

Lassen K, Trano G, Horn A, Revhaug A (2008)
Early Oral Feeding After Major Digestive Surgery Reply
Ann. Surg., 248 (6), 1109-1110
DOI 10.1097/SLA.0b013e31818f1715

van Dam RM, Hendry PO, Coolsen MME, Bemelmans MHA, Lassen K, Revhaug A, Fearon KCH, Garden OJ, Dejong CHC, Enhanced Recovery After Surg Grp (2008)
Initial experience with a multimodal enhanced recovery programme in patients undergoing liver resection
Br. J. Surg., 95 (8), 969-975
DOI 10.1002/bjs.6227

Publications 2007

Maessen J, Dejong CHC, Hausel J, Nygren J, Lassen K, Andersen J, Kessels AGH, Revhaug A, Kehlet H, Ljungqvist O, Fearon KCH, von Meyenfeldt MF (2007)
A protocol is not enough to implement an enhanced recovery programme for colorectal resection
Br. J. Surg., 94 (2), 224-231
DOI 10.1002/bjs.5468

Publications 2006

Hannemann P, Lassen K, Hausel J, Nimmo S, Ljungqvist O, Nygren J, Soop M, Fearon K, Andersen J, Revhaug A, von Meyenfeldt MF, Dejong CHC, Spies C, ERAS Grp (2006)
Patterns in current anaesthesiological peri-operative practice for colonic resections: a survey in five northern-European countries
Acta Anaesthesiol. Scand., 50 (9), 1152-1160
DOI 10.1111/j.1399-6576.2006.01121.x

Lassen K, Christensen AH, Revhaug A, Lindsetmo RO (2006)
A completely nurse-driven PICC-line service in a surgical ward: A prospective audit of the implementation-phase in unselected patients
Clin. Nutr., 25 (3), 541-542
DOI 10.1016/j.clnu.2005.12.004

Lassen K, Revhaug A (2006)
Early oral nutrition after major upper gastrointestinal surgery: why not?
Curr. Opin. Clin. Nutr. Metab. Care, 9 (5), 613-617
DOI 10.1097/01.mco.0000241673.17300.87

Publications 2005

Fearon KCH, Ljungqvist O, Von Meyenfeldt M, Revhaug A, Dejong CHC, Lassen K, Nygren J, Hausel J, Soop M, Andersen J, Kehlet H (2005)
Enhanced recovery after surgery: A consensus review of clinical care for patients undergoing colonic resection
Clin. Nutr., 24 (3), 466-477
DOI 10.1016/j.clnu.2005.02.002

Lassen K, Dejong CHC, Ljungqvist O, Fearon K, Andersen J, Hannemann P, von Meyenfeldt MF, Hausel J, Nygren J, Revhaug A (2005)
Nutritional support and oral intake after gastric resection in five northern European countries
Dig. Surg., 22 (5), 346-351
DOI 10.1159/000089770

Lassen K, Hannemann P, Ljungqvist O, Fearon K, Dejong CHC, von Meyenfeldt MF, Hausel J, Nygren J, Andersen J, Revhaug A, ERAS Grp (2005)
Patterns in current perioperative practice: survey of colorectal surgeons in five northern European countries
Br. Med. J., 330 (7505), 1420-1421
DOI 10.1136/bmj.38478.568067.AE

Nygren J, Hausel J, Kehlet H, Revhaug A, Lassen K, Dejong C, Andersen J, von Meyenfeldt M, Ljungqvist O, Fearon KC (2005)
A comparison in five European Centres of case mix, clinical management and outcomes following either conventional or fast-track perioperative care in colorectal surgery
Clin. Nutr., 24 (3), 455-461
DOI 10.1016/j.clnu.2005.02.003

Publications 2002

Lassen K, Revhaug A, Gauperaa T, Kearney M (2002)
Pedunculated lipoma of the oesophagus in a patient with achalasia
Eur. J. Surg., 168 (12), 741-743
DOI 10.1080/11024150201680034