Cardiac Arrhythmias and ECG Interpretation Quiz

Lead V1 is positioned to capture electrical activity from the right ventricle, making it useful for diagnosing right ventricular hypertrophy.

Atrial fibrillation is characterized by irregular rhythm due to chaotic atrial electrical activity and absence of P waves due to lack of coordinated atrial depolarization.

Prolonged QT interval suggests delayed ventricular repolarization, increasing the risk of ventricular arrhythmias like Torsades de Pointes.

ST segment elevation in these leads indicates myocardial injury or infarction affecting the lateral and/or anterior walls of the heart.

Ventricular tachycardia features wide QRS complexes due to abnormal ventricular depolarization and absence of P waves as atrial activity is dissociated from ventricular activity.

PR interval represents the time taken for the electrical impulse to travel from the atria to the ventricles through the AV node, reflecting atrial depolarization and AV nodal conduction.

Atrial fibrillation presents with irregularly irregular rhythm due to disorganized atrial electrical activity, and narrow QRS complexes as the ventricular conduction remains normal.

Lead aVR often shows inverted P waves due to its positioning opposite to the direction of atrial depolarization, while lead V1 usually shows upright P waves.

Lead V4R is specifically positioned to capture electrical activity from the right ventricle, aiding in the evaluation of right ventricular function.

Wolff-Parkinson-White syndrome presents with a 'delta wave' caused by abnormal accessory pathways, leading to pre-excitation of the ventricles and shortened PR intervals.

Lead aVF is positioned to view electrical activity from the inferior portion of the heart, including the inferior wall and the diaphragmatic surface of the left ventricle.

'Cannon A waves' occur in complete heart block due to atrial contraction against a closed tricuspid valve, leading to jugular venous distension and visible 'cannon A waves' on examination.