Atrial infarction is rarely diagnosed, usually being recognised only when associated with ventricular infarction. The most common ECG sign of atrial infarction is elevation or depression of the P–Ta segment, reflected by the P–R segment; this pattern, however, is usually mild (<1 mm), and is difficult to observe unless an accurate search is made.

We report the case of a premature infant with respiratory distress syndrome (RDS) and …