Military cardiologist Papanastasiou Xristos was admitted to the Military School of Officers Corps (S.S.A.S.) in 2006 and obtained his Medical Degree (MD) from the Medical School of Aristotle University of Thessaloniki (A.U.Th.) in 2012, graduating with the grade "Very Good" (8.1).
In 2016, he completed his postgraduate studies in "Medical Research Methodology" at the Medical School of A.U.Th., achieving the grade "Excellent" (9.4). Subsequently, he specialized for two years in the Pathology Clinic of the 424 General Military Training Hospital and for four years in the 1st University Cardiology Clinic of the General Hospital AHEPA.
In June 2025, he completed his doctoral thesis with the grade "Excellent with Distinction," on the topic: "The diagnostic and prognostic value of cardiac magnetic resonance imaging in patients with heart failure."
He holds the European Diploma in Cardiology and the European Diploma in Echocardiography, following successful participation in pan-European examinations.
Throughout his medical career, Dr. Papanastasiou has collaborated in research with leading universities in Europe and the United States of America, publishing significant scientific articles in reputable international journals with a high impact factor, covering the entire spectrum of cardiovascular diseases.
Simultaneously, he has served as a reviewer for prestigious international scientific journals such as the Journal of the American College of Cardiology: Cardiovascular Imaging, American Heart Journal, Heart (official journal of the British Cardiovascular Society), and International Journal of Cardiology.