Hypothermia By Daniel F Danzl, MD, University of Louisville School of Medicine Reviewed / Revised Dec 2022 View Patient Education Etiology Pathophysiology Symptoms and Signs Diagnosis Prognosis Treatment Key Points Topic Resources QT Interval Correction (EKG) Abnormal ECG showing J (Osborn)... Hypothermia is a core body temperature < 35° C Symptoms progress from shivering and lethargy to confusion, coma, and death.