Kristoffer Lassen

  • Consultant; MD, PhD
 

Original articles

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

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, PubMed 31161355

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, PubMed 31832585

Søreide 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, PubMed 31395453

Skeie E, Tangvik RJ, Nymo LS, Harthug S, Lassen K, Viste A (2019)
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 (in press)
DOI 10.1016/j.clnu.2019.07.003, PubMed 31375303

Lassen K, Nymo LS, Olsen F, Brudvik KW, Fretland ÅA, Søreide K (2018)
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, PubMed 30519886

Nymo LS, Norderval S, Eriksen MT, Wasmuth HH, Kørner H, Bjørnbeth BA, Moger T, Viste A, Lassen K (2018)
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, PubMed 30413929

Søreide K, Olsen F, Nymo LS, Kleive D, Lassen K (2018)
A nationwide cohort study of resection rates and short-term outcomes in open and laparoscopic distal pancreatectomy
HPB (Oxford), 21 (6), 669-678
DOI 10.1016/j.hpb.2018.10.006, PubMed 30391219

Nymo LS, Søreide K, Kleive D, Olsen F, Lassen K (2018)
The effect of centralization on short term outcomes of pancreatoduodenectomy in a universal health care system
HPB (Oxford), 21 (3), 319-327
DOI 10.1016/j.hpb.2018.08.011, PubMed 30297306

Lassen K, Nymo LS, Olsen F, Søreide 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, PubMed 30079394

Lassen K, Nymo LS, Kørner H, Thon K, Grindstein T, Wasmuth HH, Moger T, Bjørnbeth 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, PubMed 29628007

Nymo LS, Aabakken L, Lassen K (2017)
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, PubMed 29141477

Labori KJ, Lassen K, Hoem D, Grønbech JE, Søreide 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 (1), 94
DOI 10.1186/s12893-017-0291-1, PubMed 28841916

Giske A, Nymo LS, Fuskevåg 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 (Lond), 49 (11-12), 785-791
DOI 10.1080/23744235.2017.1342044, PubMed 28657405

Aahlin EK, Tranø G, Johns N, Horn A, Søreide JA, Fearon KC, Revhaug A, Lassen K (2016)
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, PubMed 27114108

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 (1), 32
DOI 10.1186/s12893-016-0149-y, PubMed 27193578

Aahlin EK, Tranø G, Johns N, Horn A, Søreide 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, PubMed 26148685

Aahlin EK, von Meyenfeldt M, Dejong CH, Ljungqvist O, Fearon KC, Lobo DN, Demartines N, Revhaug A, Wigmore SJ, Lassen K (2014)
Functional recovery is considered the most important target: a survey of dedicated professionals
Perioper Med (Lond), 3, 5
DOI 10.1186/2047-0525-3-5, PubMed 25089195

Hughes M, Coolsen MM, Aahlin EK, Harrison EM, McNally SJ, Dejong CH, Lassen K, Wigmore SJ (2014)
Attitudes of patients and care providers to enhanced recovery after surgery programs after major abdominal surgery
J Surg Res, 193 (1), 102-10
DOI 10.1016/j.jss.2014.06.032, PubMed 25066187

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 HR (2013)
Guidelines for perioperative care after radical cystectomy for bladder cancer: Enhanced Recovery After Surgery (ERAS(®)) society recommendations
Clin Nutr, 32 (6), 879-87
DOI 10.1016/j.clnu.2013.09.014, PubMed 24189391

Lassen K, Coolsen MM, Slim K, Carli F, de Aguilar-Nascimento JE, Schäfer M, Parks RW, Fearon KC, Lobo DN, Demartines N, Braga M, Ljungqvist O, Dejong CH, Enhanced Recovery After Surgery (ERAS) Society, for Perioperative Care, European Society for Clinical Nutrition and Metabolism (ESPEN), International Association for Surgical Metabolism and Nutrition (IASMEN) (2013)
Guidelines for perioperative care for pancreaticoduodenectomy: Enhanced Recovery After Surgery (ERAS®) Society recommendations
World J Surg, 37 (2), 240-58
DOI 10.1007/s00268-012-1771-1, PubMed 22956014

Robertson N, Gallacher PJ, Peel N, Garden OJ, Duxbury M, Lassen K, Parks RW (2012)
Implementation of an enhanced recovery programme following pancreaticoduodenectomy
HPB (Oxford), 14 (10), 700-8
DOI 10.1111/j.1477-2574.2012.00521.x, PubMed 22954007

Lassen K, Coolsen MM, Slim K, Carli F, de Aguilar-Nascimento JE, Schäfer M, Parks RW, Fearon KC, Lobo DN, Demartines N, Braga M, Ljungqvist O, Dejong CH, ERAS® Society, European Society for Clinical Nutrition and Metabolism, International Association for Surgical Metabolism and Nutrition (2012)
Guidelines for perioperative care for pancreaticoduodenectomy: Enhanced Recovery After Surgery (ERAS®) Society recommendations
Clin Nutr, 31 (6), 817-30
DOI 10.1016/j.clnu.2012.08.011, PubMed 23079762

van Dam RM, Wong-Lun-Hing EM, van Breukelen GJ, Stoot JH, van der Vorst JR, Bemelmans MH, Olde Damink SW, Lassen K, Dejong CH, ORANGE II Study Group (2012)
Open versus laparoscopic left lateral hepatic sectionectomy within an enhanced recovery ERAS® programme (ORANGE II-trial): study protocol for a randomised controlled trial
Trials, 13, 54
DOI 10.1186/1745-6215-13-54, PubMed 22559239

Nygård IE, Lassen K, Kjæve J, Revhaug A (2012)
Mortality and survival rates after elective hepatic surgery in a low-volume centre are comparable to those of high-volume centres
ISRN Surg, 2012, 783932
DOI 10.5402/2012/783932, PubMed 22900204

Hendry PO, Hausel J, Nygren J, Lassen K, Dejong CH, Ljungqvist O, Fearon KC, Enhanced Recovery After Surgery Study Group (2009)
Determinants of outcome after colorectal resection within an enhanced recovery programme
Br J Surg, 96 (2), 197-205
DOI 10.1002/bjs.6445, PubMed 19160347

van Dam RM, Hendry PO, Coolsen MM, Bemelmans MH, Lassen K, Revhaug A, Fearon KC, Garden OJ, Dejong CH, Enhanced Recovery After Surgery (ERAS) Group (2008)
Initial experience with a multimodal enhanced recovery programme in patients undergoing liver resection
Br J Surg, 95 (8), 969-75
DOI 10.1002/bjs.6227, PubMed 18618897

Lassen K, Kjaeve J, Fetveit T, Tranø 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), 721-9
DOI 10.1097/SLA.0b013e31815cca68, PubMed 18438106

Maessen J, Dejong CH, Hausel J, Nygren J, Lassen K, Andersen J, Kessels AG, Revhaug A, Kehlet H, Ljungqvist O, Fearon KC, von Meyenfeldt MF (2007)
A protocol is not enough to implement an enhanced recovery programme for colorectal resection
Br J Surg, 94 (2), 224-31
DOI 10.1002/bjs.5468, PubMed 17205493

Lassen K, Revhaug A (2006)
Early oral nutrition after major upper gastrointestinal surgery: why not?
Curr Opin Clin Nutr Metab Care, 9 (5), 613-7
DOI 10.1097/01.mco.0000241673.17300.87, PubMed 16912559

Hannemann P, Lassen K, Hausel J, Nimmo S, Ljungqvist O, Nygren J, Soop M, Fearon K, Andersen J, Revhaug A, von Meyenfeldt MF, Dejong CH, Spies C (2006)
Patterns in current anaesthesiological peri-operative practice for colonic resections: a survey in five northern-European countries
Acta Anaesthesiol Scand, 50 (9), 1152-60
DOI 10.1111/j.1399-6576.2006.01121.x, PubMed 16939479

Lassen K, Hannemann P, Ljungqvist O, Fearon K, Dejong CH, von Meyenfeldt MF, Hausel J, Nygren J, Andersen J, Revhaug A, Enhanced Recovery After Surgery Group (2005)
Patterns in current perioperative practice: survey of colorectal surgeons in five northern European countries
BMJ, 330 (7505), 1420-1
DOI 10.1136/bmj.38478.568067.AE, PubMed 15911535

Fearon KC, Ljungqvist O, Von Meyenfeldt M, Revhaug A, Dejong CH, 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), 466-77
DOI 10.1016/j.clnu.2005.02.002, PubMed 15896435

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), 455-61
DOI 10.1016/j.clnu.2005.02.003, PubMed 15896433

Lassen K, Dejong CH, 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), 346-52; discussion 352
DOI 10.1159/000089770, PubMed 16293965

Lassen K, Revhaug A, Gauperaa T, Kearney M (2002)
Pedunculated lipoma of the oesophagus in a patient with achalasia
Eur J Surg, 168 (12), 741-3
DOI 10.1080/11024150201680034, PubMed 15362587

Lassen K, Jacobsen E, Busund LT, Kjaeve J (2001)
[Air in the portal vein and necrosis of the ventricle]
Tidsskr Nor Laegeforen, 121 (2), 181-3
PubMed 11475195

Review articles

Mortensen K, Nilsson M, Slim K, Schäfer M, Mariette C, Braga M, Carli F, Demartines N, Griffin SM, Lassen K, Enhanced Recovery After Surgery (ERAS®) Group (2014)
Consensus guidelines for enhanced recovery after gastrectomy: Enhanced Recovery After Surgery (ERAS®) Society recommendations
Br J Surg, 101 (10), 1209-29
DOI 10.1002/bjs.9582, PubMed 25047143

Coolsen MM, van Dam RM, van der Wilt AA, Slim K, Lassen K, Dejong CH (2013)
Systematic review and meta-analysis of enhanced recovery after pancreatic surgery with particular emphasis on pancreaticoduodenectomies
World J Surg, 37 (8), 1909-18
DOI 10.1007/s00268-013-2044-3, PubMed 23568250

Fearon KC, Jenkins JT, Carli F, Lassen K (2012)
Patient optimization for gastrointestinal cancer surgery
Br J Surg, 100 (1), 15-27
DOI 10.1002/bjs.8988, PubMed 23165327

Coolsen MM, Wong-Lun-Hing EM, van Dam RM, van der Wilt AA, Slim K, Lassen K, Dejong CH (2012)
A systematic review of outcomes in patients undergoing liver surgery in an enhanced recovery after surgery pathways
HPB (Oxford), 15 (4), 245-51
DOI 10.1111/j.1477-2574.2012.00572.x, PubMed 23458424

Lassen K, Hϕye A, Myrmel T (2012)
Randomised trials in surgery: the burden of evidence
Rev Recent Clin Trials, 7 (3), 244-8
DOI 10.2174/157488712802281402, PubMed 22621283

Augestad KM, Berntsen G, Lassen K, Bellika JG, Wootton R, Lindsetmo RO, Study Group of Research Quality in Medical Informatics and Decision Support (SQUID) (2011)
Standards for reporting randomized controlled trials in medical informatics: a systematic review of CONSORT adherence in RCTs on clinical decision support
J Am Med Inform Assoc, 19 (1), 13-21
DOI 10.1136/amiajnl-2011-000411, PubMed 21803926

Lassen K, Soop M, Nygren J, Cox PB, Hendry PO, Spies C, von Meyenfeldt MF, Fearon KC, Revhaug A, Norderval S, Ljungqvist O, Lobo DN, Dejong CH, Enhanced Recovery After Surgery (ERAS) Group (2009)
Consensus review of optimal perioperative care in colorectal surgery: Enhanced Recovery After Surgery (ERAS) Group recommendations
Arch Surg, 144 (10), 961-9
DOI 10.1001/archsurg.2009.170, PubMed 19841366

Other articles

Søreide 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, PubMed 31485907

Lassen K (2018)
Drain After Pancreatoduodenectomy: Methodological Issues
Ann Surg, 267 (3), e58
DOI 10.1097/SLA.0000000000002103, PubMed 29408838

Lassen K, Bjørnbeth BA, Line PD, Abildgaard A, Søreide JA, Mortensen K, Grønbech 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, PubMed 28187914

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), 1057-8
DOI 10.1016/j.nut.2015.02.013, PubMed 26059385

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, PubMed 24522403

Patel HR, Cerantola Y, Valerio M, Persson B, Jichlinski P, Ljungqvist O, Hubner M, Kassouf W, Müller S, Baldini G, Carli F, Naesheim T, Ytrebo L, Revhaug A, Lassen K, Knutsen T, Aarsaether E, Wiklund P, Catto JW (2013)
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), 263-6
DOI 10.1016/j.eururo.2013.10.011, PubMed 24183418

Lassen K, Ljungqvist O, Dejong CH, Demartines N, Parks RW, Lobo DN, Coolsen MM, Fearon KC (2013)
Pancreaticoduodenectomy: ERAS recommendations
Clin Nutr, 32 (5), 870-1
DOI 10.1016/j.clnu.2013.04.019, PubMed 23731515

Lassen K (2013)
Systematic review of five feeding routes after pancreatoduodenectomy (Br J Surg 2013; 100: 589-598)
Br J Surg, 100 (5), 599
DOI 10.1002/bjs.9048, PubMed 24822249

Lassen K (2010)
[Perioperative treatment: in the track of the anesthesiologists]
Tidsskr Nor Laegeforen, 130 (15), 1449
DOI 10.4045/tidsskr.10.0715, PubMed 20706298

Lassen K (2010)
[Perioperative treatment]
Tidsskr Nor Laegeforen, 130 (11), 1122
DOI 10.4045/tidsskr.10.0493, PubMed 20531493

Lassen K (2010)
[What happened with anesthesiologists?]
Tidsskr Nor Laegeforen, 130 (7), 720
DOI 10.4045/tidsskr.10.0252, PubMed 20379325

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), 494-5
DOI 10.1002/bjs.7049, PubMed 20205225

Lassen K (2009)
Intravenous fluid therapy
Br J Surg, 96 (2), 123-4
DOI 10.1002/bjs.6466, PubMed 19160362

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

Lassen K, Kjaeve J, Vonen B, Revhaug A (2007)
[Suprapubic bladder drainage after abdominal surgery in Norway]
Tidsskr Nor Laegeforen, 127 (10), 1402
PubMed 17520006

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), 541-2
DOI 10.1016/j.clnu.2005.12.004, PubMed 16697501

Gilbert M, Wisborg T, Bjørsyik G, Lassen K, Hesselberg N, Waerhaug K, Filseth OM (2003)
[Sharp condemnation, not a cold professional assessment!]
Tidsskr Nor Laegeforen, 123 (3), 365; author reply 365
PubMed 12640910

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