[Wellens syndrome: a poorly known yet significant electrocardiographic entity].

We report the case of a 54-year-old patient admitted to an emergency department, because of a thoracic pain suspicious for angina pectoris. Although the patient had become asymptomatic on admission, his electrocardiogram presented abnormalities (biphasic T waves in V1 to V4 ) which prompted a diagnosis of unstable angina.This electrocardiophic pattern is known as Wellens' syndrome.