Left Anterior Fascicular Block: LAFB Causes and Treatment

Left anterior fascicular block is a cardiac condition which characterized by delay in transmission of impulse across the cardiac muscles, resulting in delayed pumping activity of the heart. This  condition  can be easily identified through an ECG. Also referred to as the left anterior hemiblock , this condition is  brought about by a defect on the anterior half of the bundle of His, which comprises of special group of cells responsible for transmission of electrical impulse from the AV node to the apex of the heart .


This condition is often associated and observed in acute cases of myocardial infarction. The condition is also associated with valvular disorder, cardio-myopathies, hypertension and degenerative fibrotic disease.

Left Anterior Fascicular Block Causes

There are a host of factors that are responsible for left anterior fascicular block. Some of the common causes include,

  • Chronic hypertension is considered to be one of the most common causes for the development of the condition.
  • Aortic stenosis or valvular disorders can result in the development of the condition.
  • Aortic root dilation
  • Dilated cardiomyopathy
  • Approximately 4% of all acute myocardial infarction cases are found to be associated with this condition
  • Lung diseases have also been found to be associated with the condition
  • Aging and Degenerative fibrotic disease are also commonly associated with this disorder.

What are the Symptoms of Blockage?

Left anterior fascicular block results in irregular contraction of the heart muscles. In most patients the condition is asymptomatic and not associated with any specific symptoms and the findings are based on the electrocardiogram reports. However some of the common symptoms that may be associated with the condition include,

  • Dizziness due to the defect in cardiac function
  • Chest pain may be intermittent and recurring, which is often caused  due to the impairment of circulation

This may be verified via auscultation or 2D echo.

Treatment Options for Left Anterior Fascicular Block

The treatment modalities highly depend on the degree of blockage and the severity of the symptoms associated with the condition. Some of the common treatment protocols for the management of left anterior fascicular block include,

  • Complete cardiac evaluation is imperative to  know the complete extent of the condition
  • Specialized diet considerations are required. Reducing the intake of fats and carbohydrates is highly recommended. Alternatively increase in the protein content of the diet is mandated.
  • Oral supplements: such as omega-3 fatty acids and  vitamins  is highly recommended. Replacing saturated fats with polyunsaturated fats like olive oil or flax seed oil is highly recommended as it improves the  overall health of the heart.Limiting the intake of salt in the diet is also recommended.
  • Regular exercise plays a crucial role in the management of the condition. :These  exercises include jogging, walking or moderate level of physical activities that depend upon the  tolerance level of the patient. This is to maintain functioning of the cardiovascular system.
  • Avoid smoking and alcohol: nicotine and alcohol causes vasoconstriction that further compromises the circulation of your blood.

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