Thesis defence in the University of Oulu

Doctoral Candidate

Licenciate of Medicine Arjaleena Ilo

Faculty and research unit

University of Oulu Graduate School, Faculty of Medicine, Medical Research Center Oulu
08 31520117 (vaihde)

Field of study

Vascular Surgery

Date and time of the thesis defence

18.12.2020 12:00

Place of the thesis defence

Oulu University Hospital, Auditorium 1, Zoom link: https://oulu.zoom.us/j/62348331800?pwd=K1NGMG9kbkhFRjVqb2hmWDFlbE4vZz09

Topic of the dissertation

Infrared thermography in vascular disorders - screening and follow-up

Opponent

Professor Maarit Venermo, Helsinki University Hospital

Custos

Docent Matti Pokela, Oulu University Hospital

Infrared thermography is useful method for screening diabetic feet.

Side-to-side differences and local variations in temperature are the most significant factors for identifying pathology findings. The infrared image provides information for broad regions of interest rather than merely the local temperature of a small area currently in use of screening diabetic feet. IRT is a useful tool in prevention, especially in high risk patients with diabetes, allowing even asymptomatic skin temperature-related symptoms such as inflammation to be detected earlier.

Diabetes constitutes a growing healthcare burden and diabetes-related foot problems are the leading cause of hospitalization among diabetics. Atherosclerosis is also a common disease of the lower extremities and peripheral arterial disease (PAD) has become an indicator for generalized atherosclerosis. However, PAD is less well known than coronary and cerebral artery disease, and this impairs the diagnosis and treatment of the disease and the management of risk factors.

The purpose of this study is to evaluate the use of infrared thermography in clinical work in patients with circulatory disorders compared to conventional non-invasive methods.

Side-to-side differences and local variations in temperature are the most significant factors for identifying pathology findings in both patients with diabetes or PAD. After successful revascularization, these side-to-sidelateral differences decrease and skin temperature differences were moderate during follow-up. Diabetes-related neuropathy raises the skin temperature. Surprisingly, even if toe pressure or oxygen pressure of the tissue decreases, skin temperature rises significantly. Also, an ulcer without inflammation raises the skin temperature. Individual variations in skin temperature are broad, however, and infrared thermography might not be sufficient as a single screening measurement in a clinical use among patients with vascular disorders, but it does have the potential for providing additional information.

Dissertation

Last updated: 11.12.2020