GIANT NEGATIVE U-WAVES DURING ACUTE MYOCARDIAL-INFARCTION AND ISCHEMIA

Giant negative U waves transiently appeared in a patient with acute my ocardial infarction (AMI). During hospitalization, these giant negativ e U waves (0.3-0.5 mV) were observed in leads V-2 through V-4 of the e lectrocardiogram (EGG). The waves disappeared 10 days after hospitaliz ation, but reappeared during a treadmill exercise test 3 weeks after t he onset of AMI. The same waves were detected again when the patient w as admitted for angina pectoris 3 months later. Since these giant nega tive U waves appeared concomitant with myocardial ischemia, ischemia s eems to be their cause. To our knowledge, there are no previous report s on reproducible U waves like those seen in this patient.