Category: ECG / Electrophysiology

Criteria for right atrial enlargement on ECG: Tall sharp P waves in lead II measuring 0.25 mV or more; sharp initial deflection of P wave in V1 of

Causes of right bundle branch block / pattern in ECG: ASD, Ebstein's anomaly, normal variant, Injury to right bundle during cath, LV pacing, post op TOF.

ECG Quiz 34

Preexcitation: The PR interval is short and is followed by the slurred initial portion of the QRS in lateral leads, which is the positive delta wave.

Arm lead inversion / technical dextrocardia can be recognized by inverted P waves, negative QRS and T waves in lead I. Chest leads have normal pattern.

Temporary pacing electrode: Tip of a bipolar temporary pacing electrode showing a distal tip electrode and a proximal ring electrode.

ECG Quiz 33

ECG showing LVH with strain pattern in severe aortic stenosis.

Pacemaker ventricular block: First degree, second degree and third degree block can occur at the lead – myocardial interface.

ECG showing atrial fibrillation from a case of hypertrophic cardiomyopathy with left ventricular hypertrophy with strain pattern.