Associate professor Hamrefors research is focused primarily on cardiovascular autonomic dysfunction, both from the view of the clinical entities syncope and orthostatic intolerance and from the view of cardiovascular autonomic dysfunction as a risk factor for cardiovascular disease in general terms. He has published 29 articles, including in the leading arrhythmia journals Europace and Circulation Arrhythm Electrophysiol. Working in close collaboration with Associate Professor Fedorowski, Dr. Hamrefors is involved in the Systematic Approach To Syncope (SYSTEMA)-project, a project which currently contain extensive investigations and data from more than 2000 patients with syncope and orthostatic intolerance in Sweden. Associate professor Hamrefors also works as a medical doctor at the Department of Internal Medicine at Skåne University Hospital, Malmö, Sweden.