Publications 2024

Salte OBK, Olbers T, Risstad H, Fagerland MW, Søvik TT, Blom-Høgestøl IK, Kristinsson JA, Engström M, Mala T (2024)
Ten-Year Outcomes Following Roux-en-Y Gastric Bypass vs Duodenal Switch for High Body Mass Index: A Randomized Clinical Trial
JAMA Netw Open, 7 (6), e2414340
DOI 10.1001/jamanetworkopen.2024.14340, PubMed 38829616

Publications 2023

Evensen H, Sandstad O, Larssen L, Hagen M, Kristensen VA, Søvik TT, Schulz A, Hauge T, Medhus AW (2023)
Intraoperative distensibility measurement in POEM for achalasia: impact on patient outcome and associations with other outcome variables at 1-year follow-up
Surg Endosc, 37 (12), 9283-9290
DOI 10.1007/s00464-023-10494-z, PubMed 37880446

Fasting MH, Strønen E, Glomsaker T, Søvik TT, Fyhn TJ, Mala T (2023)
Perioperative strategies for patients undergoing subtotal cholecystectomy: a single-center retrospective review of 102 procedures
Scand J Gastroenterol, 59 (4), 456-460
DOI 10.1080/00365521.2023.2289352, PubMed 38053273

Richardsen AJ, Chahal-Kummen M, Kristinsson JA, Søvik TT, Eribe IEL, Mala T (2023)
Single anastomosis gastric bypass for morbid obesity
Tidsskr Nor Laegeforen, 143 (16)
DOI 10.4045/tidsskr.23.0070, PubMed 37938008

Publications 2022

Mala T, Søvik TT, Kristinsson J (2022)
[Gastroscopy following vertical sleeve gastrectomy for morbid obesity]
Tidsskr Nor Laegeforen, 142 (7)
DOI 10.4045/tidsskr.22.0056, PubMed 35510465

Publications 2019

Salte OB, Sovik TT, Risstad H, Skattum J, Blom-Hogestol IK, Eribe IEL, Kristinsson JA, Mala T (2019)
Bariatric surgery at Oslo University Hospital 2004-14
Tidsskr. Nor. Laegeforen., 139 (10), 921-926

Salte OB, Søvik TT, Risstad H, Skattum J, Blom-Høgestøl IK, Eribe IEL, Kristinsson JA, Mala T (2019)
[Bariatric surgery at Oslo University Hospital 2004–14]
Tidsskr Nor Laegeforen, 139 (10)
DOI 10.4045/tidsskr.18.0495, PubMed 31238674

Publications 2018

Haug HM, Johnson E, Mala T, Førland DT, Søvik TT, Johannessen HO (2018)
Incarcerated paraesophageal hernia complicated by pancreatic damage and unusual comorbidity: Two retrospective case series
Int J Surg Case Rep, 54, 75-78
DOI 10.1016/j.ijscr.2018.11.064, PubMed 30529949

Hewitt S, Aasheim ET, Søvik TT, Jahnsen J, Kristinsson J, Eriksen EF, Mala T (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

Svanevik M, Risstad H, Karlsen TI, Kristinsson JA, Småstuen MC, Kolotkin RL, Søvik TT, Sandbu R, Mala T, Hjelmesæth J (2018)
Patient-Reported Outcome Measures 2 Years After Standard and Distal Gastric Bypass-a Double-Blind Randomized Controlled Trial
Obes Surg, 28 (3), 606-614
DOI 10.1007/s11695-017-2891-3, PubMed 28865057

Publications 2016

Risstad H, Svanevik M, Kristinsson JA, Hjelmesæth J, Aasheim ET, Hofsø D, Søvik TT, Karlsen TI, Fagerland MW, Sandbu R, Mala T (2016)
Standard vs Distal Roux-en-Y Gastric Bypass in Patients With Body Mass Index 50 to 60: A Double-blind, Randomized Clinical Trial
JAMA Surg, 151 (12), 1146-1155
DOI 10.1001/jamasurg.2016.2798, PubMed 27626242

Publications 2015

Engström M, Forsberg A, Søvik TT, Olbers T, Lönroth H, Karlsson J (2015)
Perception of control over eating after bariatric surgery for super-obesity--a 2-year follow-up study
Obes Surg, 25 (6), 1086-93
DOI 10.1007/s11695-015-1652-4, PubMed 25812530

Mala T, Søvik TT, Kristinsson JA (2015)
[More could benefit from bariatric surgery]
Tidsskr Nor Laegeforen, 135 (6), 521-2
DOI 10.4045/tidsskr.15.0187, PubMed 25806755

Risstad H, Søvik TT, Engström M, Aasheim ET, Fagerland MW, Olsén MF, Kristinsson JA, le Roux CW, Bøhmer T, Birkeland KI, Mala T, Olbers T (2015)
Five-year outcomes after laparoscopic gastric bypass and laparoscopic duodenal switch in patients with body mass index of 50 to 60: a randomized clinical trial
JAMA Surg, 150 (4), 352-61
DOI 10.1001/jamasurg.2014.3579, PubMed 25650964

Risstad H, Søvik TT, Hewitt S, Kristinsson JA, Fagerland MW, Bernklev T, Mala T (2015)
Changes in Health-Related Quality of Life After Gastric Bypass in Patients With and Without Obesity-Related Disease
Obes Surg, 25 (12), 2408-16
DOI 10.1007/s11695-015-1717-4, PubMed 26003550

Svanevik M, Risstad H, Hofsø D, Schou CF, Solheim B, Søvik TT, Kristinsson J, Hjelmesæth J, Mala T, Sandbu R (2015)
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

Publications 2014

Biörserud C, Olbers T, Søvik TT, Mala T, Elander A, Olsén MF (2014)
Experience of excess skin after gastric bypass or duodenal switch in patients with super obesity
Surg Obes Relat Dis, 10 (5), 891-6
DOI 10.1016/j.soard.2014.01.033, PubMed 24837559

Hewitt S, Humerfelt S, Søvik TT, Aasheim ET, Risstad H, Kristinsson J, Mala T (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

Aftab H, Risstad H, Søvik TT, Bernklev T, Hewitt S, Kristinsson JA, Mala T (2013)
Five-year outcome after gastric bypass for morbid obesity in a Norwegian cohort
Surg Obes Relat Dis, 10 (1), 71-8
DOI 10.1016/j.soard.2013.05.003, PubMed 24182445

Hewitt S, Søvik TT, Aasheim ET, Kristinsson J, Jahnsen J, Birketvedt GS, Bøhmer T, Eriksen EF, Mala T (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

Hofmann B, Hjelmesæth J, Søvik TT (2013)
Moral challenges with surgical treatment of type 2 diabetes
J Diabetes Complications, 27 (6), 597-603
DOI 10.1016/j.jdiacomp.2013.07.006, PubMed 24028746

Miras AD, Risstad H, Baqai N, Law S, Søvik TT, Mala T, Olbers T, Kristinsson JA, le Roux CW (2013)
Application of the International Diabetes Federation and American Diabetes Association criteria in the assessment of metabolic control after bariatric surgery
Diabetes Obes Metab, 16 (1), 86-9
DOI 10.1111/dom.12177, PubMed 23841525

Publications 2012

Mala T, Søvik TT, Schou CF, Kristinsson J (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

Søvik TT, Karlsson J, Aasheim ET, Fagerland MW, Björkman S, Engström M, Kristinsson J, Olbers T, Mala T (2012)
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

Hofsø D, Aasheim ET, Søvik TT, Jakobsen GS, Johnson LK, Sandbu R, Aas AT, Kristinsson J, Hjelmesæth J (2011)
[Follow-up after bariatric surgery]
Tidsskr Nor Laegeforen, 131 (19), 1887-92
DOI 10.4045/tidsskr.10.1463, PubMed 21984294

Pournaras DJ, Aasheim ET, Søvik TT, Andrews R, Mahon D, Welbourn R, Olbers T, le Roux CW (2011)
Effect of the definition of type II diabetes remission in the evaluation of bariatric surgery for metabolic disorders
Br J Surg, 99 (1), 100-3
DOI 10.1002/bjs.7704, PubMed 22021090

Schou CF, Søvik TT, Aasheim ET, Kristinsson J, Mala T (2011)
[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

Søvik TT, Aasheim ET, Taha O, Engström M, Fagerland MW, Björkman S, Kristinsson J, Birkeland KI, Mala T, Olbers T (2011)
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

Aasheim ET, Elshorbagy AK, Diep LM, Søvik TT, Mala T, Valdivia-Garcia M, Olbers T, Bøhmer T, Birkeland KI, Refsum H (2011)
Effect of bariatric surgery on sulphur amino acids and glutamate
Br J Nutr, 106 (3), 432-40
DOI 10.1017/S0007114511000201, PubMed 21554803

Aasheim ET, Søvik TT (2011)
Global trends in body-mass index
Lancet, 377 (9781), 1916-7; author reply 1917-8
DOI 10.1016/S0140-6736(11)60804-0, PubMed 21641472

Publications 2010

Sovik TT, Aasheim ET, Olbers T (2010)
Randomized clinical trial of laparoscopic gastric bypass versus laparoscopic duodenal switch for superobesity (Br J Surg 2010; 97: 160-166)
Br. J. Surg., 97 (6), 960-961
DOI 10.1002/bjs.7143

Søvik TT, Irandoust B, Birkeland KI, Aasheim ET, Schou CF, Kristinsson J, Mala T (2010)
[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

Søvik TT, Taha O, Aasheim ET, Engström M, Kristinsson J, Björkman S, Schou CF, Lönroth H, Mala T, Olbers T (2010)
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

Aasheim ET, Björkman S, Søvik TT, Engström M, Hanvold SE, Mala T, Olbers T, Bøhmer T (2009)
Vitamin status after bariatric surgery: a randomized study of gastric bypass and duodenal switch
Am J Clin Nutr, 90 (1), 15-22
DOI 10.3945/ajcn.2009.27583, PubMed 19439456

Aasheim ET, Frigstad SO, Søvik TT, Birkeland KI, Haukeland JW (2009)
Hyperinsulinemic hypoglycemia and liver cirrhosis presenting after duodenal switch: a case report
Surg Obes Relat Dis, 6 (4), 441-3
DOI 10.1016/j.soard.2009.11.007, PubMed 20096646

Aasheim ET, Hofsø D, Søvik TT (2009)
Vitamin supplements after bariatric surgery
Clin Endocrinol (Oxf), 72 (1), 134-5
DOI 10.1111/j.1365-2265.2009.03611.x, PubMed 19508588

Publications 2008

Søvik TT, Aasheim ET, Kristinsson J, Schou CF, Diep LM, Nesbakken A, Mala T (2008)
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

Aasheim ET, Søvik TT, Bakke EF (2008)
Night blindness after duodenal switch
Surg Obes Relat Dis, 4 (5), 685-6
DOI 10.1016/j.soard.2008.05.001, PubMed 18586568

Publications 2007

Søvik TT, Aasheim ET, Kristinsson J, Schou CF, Nesbakken A, Mala T (2007)
[Surgical treatment of morbid obesity at a regional center]
Tidsskr Nor Laegeforen, 127 (1), 47-9
PubMed 17205090

Aasheim ET, Mala T, Søvik TT, Kristinsson J, Bøhmer T (2007)
[Surgical treatment of morbid obesity]
Tidsskr Nor Laegeforen, 127 (1), 38-42
PubMed 17205088

Publications 1996

Søvik TT, Haaheim LR (1996)
[Use of influenza vaccine in Norway]
Tidsskr Nor Laegeforen, 116 (3), 395-6
PubMed 8638272