Intraventricular conduction delay epidemiology and demographics

Intraventricular condution delay ECG patterns can be seen commonly in general population and their prevalence increases with age. Bifascicular block (especially RBBB and LAF block) is the most common IVCD.

• The prevalence of IVCD in general population increases with age.
• Bifascicular block (especially RBBB and LAF block) is the most common IVCD preceding complete heart block in adults.
• Other forms of IVCD cases are common only next to complete intra-Hisian and infra-Hisian AV block.
• Prevalence of right bundle branch block without underlying heart disease ranges between 200 and 1300 per 100,000. RBBB is a common finding in the general population and has no prognostic significance without underlying heart diseases. Right bundle branch block and incomplete right bundle branch block are two to three times more common in men than in women. (Copenhagen City Heart Study)^[1]
• Prevalence of LBBB in the general population ranges from 200 to 1100 per 100,000. LBBB is uncommon among patients under 50 years of age (<0.5%). It occurs in 6% to 8% of patients over the age of 50.
• The prevalence of LAF block in the general population ranges from 0.9% to 6.2%.
• Isolated LPF block is very rare and almost occurs in combination with other blocks.

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