ECG Interpretation

Develop interpretation skills in ECG Basics, analyze 12-lead tracings in ECG Library, and advance proficiency in ECG Reviews.

Determining Rate

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There are two different rates that can be determined on an ECG. The atrial rate is indicated by the frequency of the P waves. The ventricular rate is indicated by the frequency of the QRS complexes.

Determining Axis

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The axis of the ECG is the major direction of the overall electrical activity of the heart. It can be normal, leftward (left axis deviation, or LAD), rightward (right axis deviation, or RAD) or indeterminate (northwest axis).

Quizzes and Cases

Test your cardiology knowledge with Quizzes and Cases on a variety of topics including Atrial Fibrillation, Coronary Artery Disease, ECG Interpretation and more. Choose Study Mode to review the answers as you go; or choose Test Mode to challenge your fastest time. You can even build your own custom quizzes!

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Cardiology Review

Broaden your understanding with hundreds of Topic Reviews, Facts and Pearls on important topics in cardiology, and Mnemonics to learn about cardiology.

Mitral Valve Regurgitation

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Mitral regurgitation is the abnormal backward flow of blood from the left ventricle (LV) to the left atrium (LA) due to disease of the mitral valve apparatus (primary MR) or due to dilation of the MV annulus from LA or LV disease (secondary MR).

Atrial Fibrillation Topic Review

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Atrial fibrillation is the most common chronic arrhythmia, characterized by erratic atrial electrical activity with atrial rates of 400 to 600 beats per minute.