LAFB on an ECG refers to Left Anterior Fascicular Block, a heart condition detectable through an abnormal electrocardiogram (ECG).
Understanding Left Anterior Fascicular Block (LAFB)
LAFB is a specific type of intraventricular block that affects the left anterior fascicle, one of the branches of the left bundle branch in the heart's electrical conduction system. When this fascicle is blocked, the electrical impulse takes an alternate route to activate the left ventricle. This altered pathway manifests as specific changes on an ECG.
LAFB and ECG Findings
The diagnosis of LAFB on an ECG typically involves the assessment of several criteria, including:
- Left Axis Deviation: The electrical axis of the heart is shifted to the left.
- Small Q Waves in Lead I and aVL: Small negative deflections (Q waves) might be present in these leads.
- Delayed R Peak in Lead aVL: The time it takes for the R wave to reach its peak is prolonged in lead aVL.
- Normal QRS Duration or only slightly prolonged: The overall duration of ventricular depolarization (QRS complex) is generally within the normal range or only slightly extended.
Clinical Significance
According to the provided reference, LAFB can be associated with an increased risk of heart failure. Therefore, its detection on an ECG warrants further investigation to identify any underlying cardiac issues and manage them appropriately.
