Knuckle Sign on ECG - Acute Pericarditis Electrocardiogram of a 68-year-old woman two days after coronary artery bypass surgery with small pericardial effusion seen on an echocardiogram. Note the diffuse ST elevation, except for the ST depression in aVR. There is evidence for PR depression in I, II and aVL, and PR elevation (‘knuckle’ sign) in aVR #Knuckle #Sign #Pericarditis #ECG #EKG #Electrocardiogram #Clinical #LeadAVR
