Chapters Archive – Page 19 of 23 – The Cardiovascular

Figure 1. Components of the ventricular conduction system and the temporal association between the ECG and impulse transmission through the heart. An intranventricular conduction delay may occur whenever any of the main components of the conduction system is dysfunctional.

Intraventricular conduction delay: bundle branch blocks & fascicular blocks

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Management of AV blocks (treatment)

Management and treatment of AV block (atrioventricular blocks)

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Figure 1. Third-degree AV block (complete heart block, AV dissociation).

Third-degree AV block (3rd degree AV block, AV block 3, AV block III)

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Figure 1. Second-degree AV block Mobitz type 1, also known as Wenckebach block.

Second-degree AV block: Mobitz type 1 (Wenckebach) & Mobitz type 2 block

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Figure 1. ECG in first-degree AV block. Both conventional paper speeds are shown.

First-degree AV block (AV block I, AV block 1)

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Figure 1. Components of the ventricular conduction system and the temporal association between the ECG waveforms and impulse transmission through the heart. Atrioventricular (AV) blocks occur due to dysfunction in the conduction system.

Overview of atrioventricular (AV) blocks

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NSTEMI (Non-ST Elevation Myocardial Infarction) & Unstable Angina: Diagnosis, Criteria, ECG, Management

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Figure 1. The coronary arteries and their relation to the ECG leads. Localization of myocardial infarction / ischemia is done by using ECG changes to determine the affected area and subsequently the occluded coronary artery (culprit).

ECG localization of myocardial infarction / ischemia and coronary artery occlusion (culprit)

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Figure 1. The component of the cardiac conduction system and the vascular supply. RCA = right coronary artery. LAD = Left anterior descending coronary artery. LCX = left circumflex coronary artery.

Supraventricular and intraventricular conduction defects in myocardial ischemia and infarction

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Figure 2. The electrocardiographic natural course in STEMI (ST elevation myocardial infarction).

The ECG in assessment of myocardial reperfusion

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