Electrocardiogram (EKG, ECG) interpretation⎢ekginterpretation.com

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Second degree AV block, mobitz I/wenckebach

Electrical conduction system of the heart

Waves, intervals and segments of the ECG

Electrical conduction system of the heart

April 16, 2010

Understanding the electrical conduction system of the heart is essential to ECG interpretation. The sinus node functions as the heart’s pacemaker. Electrical stimulus is generated in the sinoatrial node and from there impulses spread to the rest of the heart causing it to contract [...]

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First degree AV block

March 30, 2010

First degree AV block is characterized by PR prolongation more than 0.22 seconds, but all p waves conduct to the ventricles. The conduction from the atria to the ventricles are delayed and the lesion is most often located at the AV node. First degree AV block is considered a benign condition and [...]

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Second degree AV block, mobitz I/wenckebach

March 28, 2010

In Mobitz type I AV block – also called Wenckebach block – the PR interval progressively lengthens until a blocked p wave occurs. After the blocked p wave the cycle continues. The lesion is often at the atrioventricular node. The number of beats before [...]

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Second degree heart block, advanced 2:1

March 26, 2010

In advanced second degree AV block only every second (2:1 AV block), third (3:1 AV block) or fourth (4:1 AV block) p wave conduct to the ventricles. A conduction ratio of 3:1 or higher is also referred to as high degree or high grade atrioventricular [...]

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Third degree AV block

March 24, 2010

In third degree AV block – also called complete AV block – the conduction from the atria is completely blocked and the atria and ventricles contract independently. On the ECG there is no relationship between the p waves and the QRS complexes (AV dissociation). The ventricles are instead activated from a more distal focus, either from the AV node or the ventricles depending on the location of the lesion causing the block [...]

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How to recognize AV blocks

March 22, 2010

Atrioventricular (AV) blocks (heart blocks) are characterized by impaired conduction between the atria and the ventricles of the heart. They are classified into first, second or third degree AV block depending on the severity of the block – third being more severe than first. The impairment causing heart blocks can be located on more levels [...]

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