IV. DIAGNOSIS OF SPECIFIC CONDITIONS A. Acute Myocardial Infarction
Figure 12 shows the ECG tracing of a patient with atrial fibrillation in whom the fast ventricular rate has been reduced to 105 beats per minute by a beta-adrenergic blocking drug. (For other arrhythmias, see the chapter Arrhythmias/Palpitations).
Figure 15 shows features of WPW syndrome: Delta wave in leads 11, 111, a VF and V1 to V5. Note the short PR interval <0.10 seconds. Figure 14 shows ventrical premature beats: runs of two (couplets) and run of 5 beats = nonsustained ventricular tachycardia.