Jon Kristinsson
- Chief Surgeon; MD, PhD
President of the Norwegian Society for Surgery of Obesity
Publications 2023
Associations of adherence to physical activity and dietary recommendations with weight recurrence 1-5 years after metabolic and bariatric surgery
Surg Obes Relat Dis, 20 (4), 383-390
DOI 10.1016/j.soard.2023.11.014, PubMed 38160134
Publications 2022
[Gastroscopy following vertical sleeve gastrectomy for morbid obesity]
Tidsskr Nor Laegeforen, 142 (7)
DOI 10.4045/tidsskr.22.0056, PubMed 35510465
Publications 2021
The first modified Delphi consensus statement on sleeve gastrectomy
Surg Endosc, 35 (12), 7027-7033
DOI 10.1007/s00464-020-08216-w, PubMed 33433676
Letter to the Editor
Obes Surg, 31 (12), 5459
DOI 10.1007/s11695-021-05523-6, PubMed 34165667
Standard versus distal Roux-en-Y gastric bypass in patients with BMI 50-60 kg/m2: 5-year outcomes of a double-blind, randomized clinical trial
BJS Open, 5 (6)
DOI 10.1093/bjsopen/zrab105, PubMed 34791048
Visual, Verbal and Everyday Memory 2 Years After Bariatric Surgery: Poorer Memory Performance at 1-Year Follow-Up
Front Psychol, 11, 607834
DOI 10.3389/fpsyg.2020.607834, PubMed 33488469
Publications 2020
Health benefits and risks during 10 years after Roux-en-Y gastric bypass
Surg Endosc, 34 (12), 5368-5376
DOI 10.1007/s00464-019-07328-2, PubMed 31993812
Relationships Between Vitamin D Status and PTH over 5 Years After Roux-en-Y Gastric Bypass: a Longitudinal Cohort Study
Obes Surg, 30 (9), 3426-3434
DOI 10.1007/s11695-020-04582-5, PubMed 32306297
The First Modified Delphi Consensus Statement for Resuming Bariatric and Metabolic Surgery in the COVID-19 Times
Obes Surg, 31 (1), 451-456
DOI 10.1007/s11695-020-04883-9, PubMed 32740826
Preoperative inhibitory control predicts weight loss 1 year after bariatric surgery
Eur Eat Disord Rev, 29 (1), 123-132
DOI 10.1002/erv.2801, PubMed 33125194
Publications 2019
Irritable bowel syndrome-like symptoms and health related quality of life two years after Roux-en-Y gastric bypass - a prospective cohort study
BMC Gastroenterol, 19 (1), 204
DOI 10.1186/s12876-019-1103-0, PubMed 31791249
Abdominal pain and symptoms before and after Roux-en-Y gastric bypass
BJS Open, 3 (3), 317-326
DOI 10.1002/bjs5.50148, PubMed 31183448
Executive Function, Eating Behavior, and Preoperative Weight Loss in Bariatric Surgery Candidates: An Observational Study
Obes Facts, 12 (5), 489-501
DOI 10.1159/000502118, PubMed 31505516
Publications 2018
Relationships of serum 25-hydroxyvitamin D, ionized calcium and parathyroid hormone after obesity surgery
Clin Endocrinol (Oxf), 88 (3), 372-379
DOI 10.1111/cen.13531, PubMed 29235126
Biliopancreatic Diversion is associated with greater increases in energy expenditure than Roux-en-Y Gastric Bypass
PLoS One, 13 (4), e0194538
DOI 10.1371/journal.pone.0194538, PubMed 29617391
Publications 2017
Hepatotoxicity During Maintenance Therapy and Prognosis in Children With Acute Lymphoblastic Leukemia
J Pediatr Hematol Oncol, 39 (3), 161-166
DOI 10.1097/MPH.0000000000000733, PubMed 28060115
Chronic Abdominal Pain and Symptoms 5 Years After Gastric Bypass for Morbid Obesity
Obes Surg, 27 (6), 1438-1445
DOI 10.1007/s11695-016-2499-z, PubMed 28028658
Gastrointestinal symptoms after bariatric surgery-more focus needed
Surg Obes Relat Dis, 13 (7), 1251
DOI 10.1016/j.soard.2017.03.009, PubMed 28438495
Prevalence and predictors of irritable bowel syndrome in patients with morbid obesity: a cross-sectional study
BMC Obes, 4, 22
DOI 10.1186/s40608-017-0159-z, PubMed 28680646
Publications 2016
Maintenance therapy of childhood acute lymphoblastic leukemia revisited-Should drug doses be adjusted by white blood cell, neutrophil, or lymphocyte counts?
Pediatr Blood Cancer, 63 (12), 2104-2111
DOI 10.1002/pbc.26139, PubMed 27447547
Publications 2015
The ASMBS textbook of bariatric surgery, vol 2, Integrated health
Tidsskr. Nor. Laegeforen., 135 (11), 1058
DOI 10.4045/tidsskr.15.0328
Perioperative Outcomes of Proximal and Distal Gastric Bypass in Patients with BMI Ranged 50-60 kg/m(2)--A Double-Blind, Randomized Controlled Trial
Obes Surg, 25 (10), 1788-95
DOI 10.1007/s11695-015-1621-y, PubMed 25761943
Vitamin concentrations 5 years after gastric bypass
Eur J Clin Nutr, 69 (11), 1249-55
DOI 10.1038/ejcn.2015.82, PubMed 26081488
Publications 2014
Long-term improvements in pulmonary function 5 years after bariatric surgery
Obes Surg, 24 (5), 705-11
DOI 10.1007/s11695-013-1159-9, PubMed 24435516
Publications 2013
Secondary hyperparathyroidism, vitamin D sufficiency, and serum calcium 5 years after gastric bypass and duodenal switch
Obes Surg, 23 (3), 384-90
DOI 10.1007/s11695-012-0772-3, PubMed 23015268
[Acute internal hernia following gastric bypass for morbid obesity]
Tidsskr Nor Laegeforen, 133 (6), 640-4
DOI 10.4045/tidsskr.12.1113, PubMed 23552158
Publications 2012
Blood clot obstruction of the jejunojejunostomy after laparoscopic gastric bypass
Surg Obes Relat Dis, 9 (2), 234-7
DOI 10.1016/j.soard.2011.12.014, PubMed 22421098
Gastrointestinal function and eating behavior after gastric bypass and duodenal switch
Surg Obes Relat Dis, 9 (5), 641-7
DOI 10.1016/j.soard.2012.06.006, PubMed 22951078
Publications 2011
[Follow-up after bariatric surgery]
Tidsskr Nor Laegeforen, 131 (19), 1887-92
DOI 10.4045/tidsskr.10.1463, PubMed 21984294
Endoscopic snare resection followed by laser ablation in the treatment of large, sessile rectal adenomas
Scand J Surg, 100 (2), 99-104
DOI 10.1177/145749691110000206, PubMed 21737385
[Treating morbid obesity with laparoscopic biliopancreatic diversion with duodenal switch]
Tidsskr Nor Laegeforen, 131 (19), 1882-6
DOI 10.4045/tidsskr.10.1164, PubMed 21984293
Weight loss, cardiovascular risk factors, and quality of life after gastric bypass and duodenal switch: a randomized trial
Ann Intern Med, 155 (5), 281-91
DOI 10.7326/0003-4819-155-5-201109060-00005, PubMed 21893621
Publications 2010
The degree of myelosuppression during maintenance therapy of adolescents with B-lineage intermediate risk acute lymphoblastic leukemia predicts risk of relapse
Leukemia, 24 (4), 715-20
DOI 10.1038/leu.2009.303, PubMed 20130603
[Type 2 diabetes and metabolic syndrome before and after gastric bypass]
Tidsskr Nor Laegeforen, 130 (13), 1347-50
DOI 10.4045/tidsskr.09.0935, PubMed 20596116
Randomized clinical trial of laparoscopic gastric bypass versus laparoscopic duodenal switch for superobesity
Br J Surg, 97 (2), 160-6
DOI 10.1002/bjs.6802, PubMed 20035530
Publications 2009
Methotrexate/6-mercaptopurine maintenance therapy influences the risk of a second malignant neoplasm after childhood acute lymphoblastic leukemia: results from the NOPHO ALL-92 study
Blood, 113 (24), 6077-84
DOI 10.1182/blood-2008-11-187880, PubMed 19224761
Long-term results of NOPHO ALL-92 and ALL-2000 studies of childhood acute lymphoblastic leukemia
Leukemia, 24 (2), 345-54
DOI 10.1038/leu.2009.251, PubMed 20010622
Oral methotrexate/6-mercaptopurine may be superior to a multidrug LSA2L2 Maintenance therapy for higher risk childhood acute lymphoblastic leukemia: results from the NOPHO ALL-92 study
J Pediatr Hematol Oncol, 31 (6), 385-92
DOI 10.1097/MPH.0b013e3181a6e171, PubMed 19648786
Publications 2008
Thiopurine methyltransferase activity is related to the risk of relapse of childhood acute lymphoblastic leukemia: results from the NOPHO ALL-92 study
Leukemia, 23 (3), 557-64
DOI 10.1038/leu.2008.316, PubMed 18987654
Establishing laparoscopic Roux-en-Y gastric bypass: perioperative outcome and characteristics of the learning curve
Obes Surg, 19 (2), 158-165
DOI 10.1007/s11695-008-9584-x, PubMed 18566869
Publications 2007
[Surgical treatment of morbid obesity at a regional center]
Tidsskr Nor Laegeforen, 127 (1), 47-9
PubMed 17205090
[Surgical treatment of morbid obesity]
Tidsskr Nor Laegeforen, 127 (1), 38-42
PubMed 17205088
Publications 2003
Incidence of juvenile idiopathic arthritis in the Nordic countries. A population based study with special reference to the validity of the ILAR and EULAR criteria
J Rheumatol, 30 (10), 2275-82
PubMed 14528529
Age- and sex-specific incidence of childhood leukemia by immunophenotype in the Nordic countries
J Natl Cancer Inst, 95 (20), 1539-44
DOI 10.1093/jnci/djg064, PubMed 14559876
Intensification of mercaptopurine/methotrexate maintenance chemotherapy may increase the risk of relapse for some children with acute lymphoblastic leukemia
J Clin Oncol, 21 (7), 1332-9
DOI 10.1200/JCO.2003.04.039, PubMed 12663723
Publications 2002
The influence of heredity for psoriasis on the ILAR classification of juvenile idiopathic arthritis
J Rheumatol, 29 (11), 2454-8
PubMed 12415608
Comparison of faecal and intestinal concentrations of granulocyte marker protein and localization of gastrointestinal tumours in rats
Scand J Gastroenterol, 37 (9), 1029-33
DOI 10.1080/003655202320378211, PubMed 12374227
Publications 2001
Construct validity of ILAR and EULAR criteria in juvenile idiopathic arthritis: a population based incidence study from the Nordic countries. International League of Associations for Rheumatology. European League Against Rheumatism
J Rheumatol, 28 (12), 2737-43
PubMed 11764226
A new fecal calprotectin test for colorectal neoplasia. Clinical results and comparison with previous method
Scand J Gastroenterol, 36 (3), 291-6
DOI 10.1080/003655201750074618, PubMed 11305517
Fecal excretion of calprotectin in colorectal cancer: relationship to tumor characteristics
Scand J Gastroenterol, 36 (2), 202-7
DOI 10.1080/003655201750065979, PubMed 11252414
Screening of first degree relatives of patients operated for colorectal cancer: evaluation of fecal calprotectin vs. hemoccult II
Digestion, 64 (2), 104-10
DOI 10.1159/000048848, PubMed 11684824
Screening of first degree relatives of patients operated for colorectal cancer: evaluation of fecal calprotecin vs. hemocculat II
In Digestion, Karger, Basel, 64(2001)nr 2, s.104-110
BIBSYS 022002162
Fatal poisoning in drug addicts in the Nordic countries
Forensic Sci Int, 123 (1), 63-9
DOI 10.1016/s0379-0738(01)00524-2, PubMed 11731199
Copper, ceruloplasmin and superoxide dismutase (SOD1) in patients with Down's syndrome
Pharmacol Toxicol, 89 (6), 320-5
DOI 10.1034/j.1600-0773.2001.d01-168.x, PubMed 11903959
Publications 2000
Severe atenolol and diltiazem overdose
J Toxicol Clin Toxicol, 38 (6), 661-5
DOI 10.1081/clt-100102018, PubMed 11185975
Copper, ceruloplasmin and superoxide dismutase (SOD) in amyotrophic lateral sclerosis
Pharmacol Toxicol, 87 (3), 126-30
DOI 10.1111/j.0901-9928.2000.870305.x, PubMed 11068853
Publications 1999
Possible carcinogenic effect of 6-mercaptopurine on bone marrow stem cells: relation to thiopurine metabolism
Cancer, 86 (6), 1080-6
DOI 10.1002/(sici)1097-0142(19990915)86:6<1080::aid-cncr26>3.0.co;2-5, PubMed 10491537
Drugged driving in the Nordic countries--a comparative study between five countries
Forensic Sci Int, 106 (3), 173-90
DOI 10.1016/s0379-0738(99)00194-2, PubMed 10680066
Granulocyte marker protein is increased in stools from rats with azoxymethane-induced colon cancer
Scand J Gastroenterol, 34 (12), 1216-23
DOI 10.1080/003655299750024733, PubMed 10636069
Copper, ceruloplasmin, superoxide dismutase and iron parameters in Parkinson's disease
Pharmacol Toxicol, 85 (5), 239-43
DOI 10.1111/j.1600-0773.1999.tb02015.x, PubMed 10608487
Publications 1998
Intensified treatment of acute childhood lymphoblastic leukaemia has improved prognosis, especially in non-high-risk patients: the Nordic experience of 2648 patients diagnosed between 1981 and 1996. Nordic Society of Paediatric Haematology and Oncology (NOPHO)
Acta Paediatr, 87 (11), 1151-61
DOI 10.1080/080352598750031149, PubMed 9846917
The clinical indications for identical pathogenesis of isolated and non-isolated testicular relapses in acute lymphoblastic leukaemia
Acta Paediatr, 87 (6), 638-43
DOI 10.1080/080352598750014049, PubMed 9686656
Fecal calprotectin concentration in patients with colorectal carcinoma
Dis Colon Rectum, 41 (3), 316-21
DOI 10.1007/BF02237485, PubMed 9514426
Cat-scratch disease manifesting as unifocal helioid choroiditis
Arch Ophthalmol, 116 (9), 1249-51
PubMed 9747695
A pharmacokinetic evaluation of pravastatin in middle-aged and elderly volunteers
Eur J Drug Metab Pharmacokinet, 23 (1), 13-8
DOI 10.1007/BF03189821, PubMed 9625267
Copper, ceruloplasmin and superoxide dismutase in patients with Alzheimer's disease . a case-control study
Dement Geriatr Cogn Disord, 9 (5), 239-42
DOI 10.1159/000017067, PubMed 9701674
Publications 1997
Impact of morning versus evening schedule for oral methotrexate and 6-mercaptopurine on relapse risk for children with acute lymphoblastic leukemia. Nordic Society for Pediatric Hematology and Oncology (NOPHO)
J Pediatr Hematol Oncol, 19 (2), 102-9
DOI 10.1097/00043426-199703000-00002, PubMed 9149738
Publications 1996
Pharmacokinetics of lignocaine in Icelandic horses after infiltration anaesthesia
Vet Rec, 138 (5), 111-2
DOI 10.1136/vr.138.5.111, PubMed 8650905
Drug addict deaths in the Nordic countries: a study based on medicolegally examined cases in the five Nordic countries in 1991
Forensic Sci Int, 77 (1-2), 109-18
DOI 10.1016/0379-0738(95)01849-2, PubMed 8675131
Fatal poisonings in young drug addicts in the Nordic countries: a comparison between 1984-1985 and 1991
Forensic Sci Int, 78 (1), 29-37
DOI 10.1016/0379-0738(95)01850-6, PubMed 8855045
Publications 1995
Risk of relapse in childhood acute lymphoblastic leukemia is related to RBC methotrexate and mercaptopurine metabolites during maintenance chemotherapy. Nordic Society for Pediatric Hematology and Oncology
J Clin Oncol, 13 (2), 345-51
DOI 10.1200/JCO.1995.13.2.345, PubMed 7531219
Outcome after first relapse in children with acute lymphoblastic leukemia: a population-based study of 315 patients from the Nordic Society of Pediatric Hematology and Oncology (NOPHO)
Med Pediatr Oncol, 25 (5), 372-8
DOI 10.1002/mpo.2950250503, PubMed 7674994
Publications 1994
[The role of carbon monoxide and ethanol in fire casualties: A retrospective study of carboxyhemoglobin and blood ethanol levels in fire victims]
Laeknabladid, 80 (5), 185-8
PubMed 21593521
The metabolism of mebeverine in man: identification of urinary metabolites by gas chromatography/mass spectrometry
Pharmacol Toxicol, 74 (3), 174-80
DOI 10.1111/j.1600-0773.1994.tb01095.x, PubMed 8008724
Cerebral irradiation causes blunted pubertal growth in girls treated for acute leukemia
Med Pediatr Oncol, 22 (6), 375-9
DOI 10.1002/mpo.2950220604, PubMed 8152398
Publications 1993
Faecal calprotectin: a novel test for the diagnosis of colorectal cancer?
Scand J Gastroenterol, 28 (12), 1073-6
DOI 10.3109/00365529309098312, PubMed 8303210
Publications 1991
Chlormezanone plasma and blood levels in patients after single and repeated oral doses and after suicidal drug overdose
Eur J Drug Metab Pharmacokinet, 16 (1), 43-7
DOI 10.1007/BF03189873, PubMed 1936060
Publications 1989
[Fatal poisoning in Scandinavia--narcotic addicts are a high-risk group]
Nord Med, 104 (8-9), 224-7
PubMed 2780278
Fatal intoxications in the Nordic countries. A forensic toxicological study with special reference to young drug addicts
Z Rechtsmed, 102 (6), 355-65
DOI 10.1007/BF00200244, PubMed 2567559
Publications 1983
Organ levels of amitriptyline and nortriptyline in fatal amitriptyline poisoning
Acta Pharmacol Toxicol (Copenh), 52 (2), 150-2
DOI 10.1111/j.1600-0773.1983.tb03417.x, PubMed 6846023
Publications 1982
An efficient method for the extraction of antidepressant drugs from post mortem samples
Acta Pharmacol Toxicol (Copenh), 50 (4), 318-20
DOI 10.1111/j.1600-0773.1982.tb00981.x, PubMed 7102349
Publications 1981
A gas chromatographic method for the determination of antidepressant drugs in human serum
Acta Pharmacol Toxicol (Copenh), 49 (5), 390-8
DOI 10.1111/j.1600-0773.1981.tb00921.x, PubMed 7345880
Publications 1977
A case of fatal propranolol intoxication
Acta Pharmacol Toxicol (Copenh), 41 (2), 190-2
DOI 10.1111/j.1600-0773.1977.tb02138.x, PubMed 579057