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Home > West Medicine > Internal Medicine > Cardiology
I44.700

Left Bundle-branch Block

心内科

Common symptoms

心音异常、心绞痛、驻站医

The pathology of disease

Left bundle-branch block (LBBB) is block of the left bundle branch, causing wide QRS with typical morphology. New LBBB may indicate acute MI. Chronic LBBB is associated with structural heart disease; in HFrEF with wide QRS, cardiac resynchronization therapy (CRT) improves outcomes. Treatment: treat underlying cause; acute - rule out MI; chronic - investigate structural disease; CRT if HFrEF with LBBB/QRS >130ms.

Common Symptoms

Often asymptomatic; wide QRS on ECG; new LBBB suggests MI; associated with structural disease

Causes and Pathogenesis

Degenerative/ischemic/hypertensive disease blocks the left bundle branch.

Treatment

Treat cause; acute - rule out MI; CRT if HFrEF with wide LBBB

Preventive Measures

Investigate structural disease; evaluate for CRT in HFrEF.

Department to Visit

It is recommended to visit the Cardiology/EP department; an appointment can be booked on this platform before the visit.

Warm reminder: The above information is for health science reference only and cannot replace professional medical diagnosis. If you have related symptoms, please seek medical attention at a regular hospital promptly.