Atrial pacing at a rate of 90/minute (shown here) prevented the arrhythmia, shortened the QT interval and reversed the T wave abnormality. Notice the pacing artifact (P) before each P wave. The QT interval is now 360 ms. (0.36 seconds). Book traversal links for 5.6.14 (110) 5.6.13 (109) Up 5.6.15 (frame 112)