Karlstad, Øystein

Arterial events, venous thromboembolism, thrombocytopenia, and bleeding after vaccination with Oxford-AstraZeneca ChAdOx1-S in Denmark and Norway: population based cohort study

Pottegård, A., Lund, L. C., Karlstad, Ø., Dahl, J., Andersen, M., Hallas, J., Lidegaard, Ø., Tapia, G., Gulseth, H. L., Ruiz, P. L.-D., et al. (2021) · BMJ

SARS-CoV-2 and COVID-19 ResearchCOVID-19 Clinical Research Studies

Cited by 401

SARS-CoV-2 vaccination and myocarditis in a Nordic cohort study of 23 million residents

Karlstad, Ø., Hovi, P., Husby, A., Härkänen, T., Selmer, R. M., Pihlström, N., Hansen, J. V., Nohynek, H., Gunnes, N., Sundström, A., et al. (2022) · JAMA Cardiology

Viral Infections and Immunology ResearchSARS-CoV-2 and COVID-19 Research

Cited by 221

Association Between Methylphenidate and Amphetamine Use in Pregnancy and Risk of Congenital Malformations: A Cohort Study From the International Pregnancy Safety Study Consortium

Huybrechts, K. F., Bröms, G., Christensen, L. B., Einarsdóttir, K., Engeland, A., Furu, K., Gissler, M., Hernandez-Diaz, S., Karlsson, P., Karlstad, Ø., et al. (2018) · JAMA Psychiatry

Pregnancy and Medication ImpactPrenatal Substance Exposure Effects

Cited by 142

Use of semaglutide and risk of non‐arteritic anterior ischemic optic neuropathy: A Danish–Norwegian cohort study

Simonsen, E., Lund, L. C., Ernst, M. T., Hjellvik, V., Hegedüs, L., Hamann, S., Jørstad, Ø. K., Gulseth, H. L., Karlstad, Ø., & Pottegård, A. (2025) · Diabetes, Obesity and Metabolism

Diabetes Treatment and ManagementDrug-Induced Ocular Toxicity

Cited by 85

Glucagon-Like Peptide 1 Receptor Agonists and Risk of Thyroid Cancer: An International Multisite Cohort Study

Baxter, S. M., Lund, L. C., Andersen, J. H., Brix, T. H., Hegedüs, L., Hsieh, M. H.-C., Su, C. T.-T., Cheng, M. C.-Y., Chang, Z. C.-J., Lai, E. C.-C., et al. (2025) · Thyroid®

Diabetes Treatment and ManagementMetabolism, Diabetes, and Cancer

Cited by 81

Pharmacological treatment of obesity in adults in Norway 2004–2022

Ruiz, P. L., Karlstad, Ø., Nøkleby, K., Slåtsve, K., Gulseth, H. L., Meyer, H. E., Sveen, K. A., Qvigstad, E., & Furu, K. (2024) · Diabetes, Obesity and Metabolism

Pharmacology and Obesity TreatmentBariatric Surgery and Outcomes

Cited by 14