Peter Majak

• Gravdahl, Oline Friestad; Svenningsen, Rune; Majak, Peter & Majak, Guri Bårdstu (2025). Menstrual-related symptoms as red flags for school absenteeism among Norwegian adolescents (MINA): A cross-sectional study. Acta Obstetricia et Gynecologica Scandinavica. ISSN 0001-6349. 104(4), p. 746–754. doi: 10.1111/aogs.15062. Full text in Research Archive Show summary

  Introduction Severe dysmenorrhea is prevalent among adolescents, yet it remains undertreated, potentially leading to substantial absenteeism from social and academic activities. This study aimed to evaluate the prevalence of severe dysmenorrhea among Norwegian adolescents, as well as associations between severe dysmenorrhea and academic or social absenteeism. Moreover, the study sought to assess the prevalence of accompanying symptoms and their potential as red flags for absenteeism, thus providing healthcare workers a more robust tool for identifying students for intensified treatment and/or referral. Furthermore, differences in the prevalence of severe dysmenorrhea, accompanying symptoms, and absenteeism based on ethnicity and place of residence were evaluated. Material and Methods This cross-sectional study utilized a digital questionnaire comprising 67 questions divided into three categories: “demographics,” “dysmenorrhea-related complaints,” and “consequences and actions related to complaints.” Data were analyzed using Chi-square tests and a multivariate logistic regression model. Results A total of 987 high school students completed the questionnaire and were included in the final analyses. Of them, 38.1% had scores of ≥8 on the Numeric Rating Scale, classified as severe dysmenorrhea. Participants with severe dysmenorrhea reported a significantly higher degree of absenteeism from both school (85.0% vs. 53.1%, p < 0.001) and social settings (84.3% vs. 53.9%, p < 0.001) than those with mild-to-moderate dysmenorrhea. Menorrhagia (odds ratio [OR] = 1.55, p = 0.012), dyschezia (OR = 1.63, p = 0.007), vomiting (OR = 1.97, p = 0.009), and fatigue (OR = 1.97, p = 0.026) were significant predictors of academic absenteeism in a logistic regression analysis. These can serve as relevant red flags for caretakers. Higher rates of social (74.4% vs. 57.0%, p < 0.001) and academic absenteeism (72.9% vs. 57.5%, p < 0.001) due to dysmenorrhea were observed among participants of non-Norwegian ethnicity. Conclusions A high prevalence of severe dysmenorrhea and associated symptoms was observed among Norwegian adolescents, leading to a high degree of absenteeism from school and social activities. The highest prevalence of absenteeism was observed among participants of non-Norwegian ethnicity. Symptoms accompanying severe dysmenorrhea should serve as red flags for healthcare professionals caring for adolescents.

• Wang, Johan; Majak, Peter; Woldbæk, Per R & Madsen, Eirik (2021). Midtlappstorsjon etter lobektomi. Tidsskrift for Den norske legeforening (Tidsskriftet). ISSN 0029-2001. 141, p. 1712–1714. doi: 10.4045/tidsskr.21.0150. Full text in Research Archive
• Hoffman, Pavel; Al-Ani, Ahmed Ibrahim; Lueder, Thomas Gero von; Hoffman, Jenny; Majak, Peter & Hagen, Ove Andreas [Show all 9 contributors for this article] (2018). Access site complications after transfemoral aortic valve implantation - a comparison of Manta and ProGlide. CVIR Endovascular. 1(1). doi: 10.1186/s42155-018-0026-0. Full text in Research Archive Show summary

  Background: Despite decreasing sheath diameter, access site bleeding and vascular complications are still a major concern in transfemoral aortic valve implantation (TAVI), and may increase morbidity and even increase mortality. The aim was to compare safety of arterial closure in transfemoral TAVI with two different principles, pre-suture with ProGlide and collagen plug closure with Manta. Results: Seventy-six patients treated with ProGlide and 75 with Manta were analysed. The endpoints were 1: access site vascular complications and 2: non-planned vascular or endovascular surgery at the puncture site. Complications occurred in 2 (2.7%) ProGlide and in 8 (10.7%) Manta cases, p = 0.047. During the learning phase there were no significant differences. In the established phase there was one event (2%) in the ProGlide group, compared to 6 endpoints (12.0%), p = 0.047, in the Manta group. Unplanned surgery or intervention was seen in two (2.7%) ProGlide and in 7 (9.3%) Manta patients, p = ns. There were no significant differences during the learning phase. In established use, endpoints occurred more frequently in patients treated with the Manta device (12%), than in patients treated with the ProGlide (2%), p = 0.047. Conclusion: The ProGlide presuture closure device was associated with significantly lower rates of vascular complications and lower rates of surgery and interventions compared to the collagen plug Manta system.

• Majak, Piotr & Næss, Pål Aksel (2016). Rib fractures in trauma patients: does operative fixation improve outcome? Current Opinion in Critical Care. ISSN 1070-5295. 22(6), p. 572–577. doi: 10.1097/MCC.0000000000000364. Full text in Research Archive
• Majak, Piotr; Lunde, Ida Gjervold; Hasic, Almira; Husebye, Trygve Guttorm; Christensen, Geir Arve & Tønnessen, Theis [Show all 7 contributors for this article] (2015). Reduced visfatin levels in aortic stenosis increase after aortic valve replacement and may contribute to reverse left ventricular remodelling. Journal of Cardiovascular Surgery. ISSN 0021-9509. 56(3), p. 483–492. Full text in Research Archive
• Majak, Piotr; Braathen, Bjørn; BJØRNSTAD, JOHANNES & Tønnessen, Theis (2012). GDF-15 is increased during early reperfusion following aortic valve replacement. Scandinavian Cardiovascular Journal. ISSN 1401-7431. 46(2), p. 99–106. doi: 10.3109/14017431.2011.649489. Full text in Research Archive
• Majak, Piotr; BJØRNSTAD, JOHANNES; Braathen, Bjørn; Lunde, Ida Gjervold; Husebye, Trygve Guttorm & Christensen, Geir Arve [Show all 7 contributors for this article] (2012). Endothelin-1 in the Human Myocardium and Circulating Plasma: Evaluation before, during and after Correction of Aortic Stenosis with Aortic Valve Replacement. Cardiology. ISSN 0008-6312. 123(1), p. 1–10. doi: 10.1159/000339756. Full text in Research Archive
• Majak, Piotr; Bjørnstad, Johannes; Vengen, Øystein; Neverdal, Nils Olav; Husebye, Trygve & Woldbæk, Per R [Show all 10 contributors for this article] (2010). Plasma IL-18 and IL-18BP are altered differently in reverse remodeling following aortic valve replacement. Scandinavian Cardiovascular Journal. ISSN 1401-7431. 44(2), p. 113–118. doi: 10.3109/14017430903426902. Full text in Research Archive

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