ST segment

noun
variants: or S-T segment \ ˌes-​ˈtē-​ How to pronounce S-T segment (audio) \

Medical Definition of ST segment

: the part of an electrocardiogram between the QRS complex and the T wave … he had no chest pain, lacked a high coronary risk profile, and had normal ST segments on maximal effort.— John Davis Cantwell, Physician and Sportsmedicine, March 1981

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