Contents
Definition of blockade of the leg of His
His bundle conduction disorder is a dangerous disease that is directly related to serious violations of the impulse conduction required for the proper functioning of the heart. This disease is diagnosed in many countries of the world. Incomplete blockade of the right leg of the bundle of His is considered a partial violation of the passage of an important electrical impulse on the right side of the leg of the bundle of His. With a complete blockade of the right leg of the bundle of His, an inevitable cessation of the conduction of excitation occurs
As a rule, right bundle branch block is very rare in young people. Of the general indicators, it is no more than 0,1% of all cases. With age, the incidence increases. In persons over 40 years of age, such disorders occur in approximately 4,5%. Experts have noticed that this disease most often occurs in men. With a dangerous acute myocardial infarction, the disease usually appears in no more than 3% of cases. Often it is provoked by an anterior transmural infarction. With posterior myocardial infarction, partial blockade is diagnosed.
Causes of blockade of the bundle of His bundle
The main factors in the development of the presented disease are heart valve defects, previous myocardial infarction, as well as hypertension. The reasons for the complete blockade may be special congenital conditions or acquired diseases.
Congenital moments include stenosis of the mouth of the pulmonary artery, incomplete development of a segment of a typical right bundle of His bundle, atrial septal defect, ventricular septal defect, as well as various heart defects that always lead to right ventricular overload.
Common acquired factors include chronic obstructive airway disease, neoplasms of the heart, blunt chest trauma, progressive muscular dystrophy, overdose of certain medications, the presence of negatively changing pathologies in the myocardium, and hyperkalemia characterized by a high content of potassium.
Symptoms of bundle branch block
Unfortunately, incomplete isolated blockade of a typical right bundle branch block practically does not manifest itself. However, it can be accidentally detected on an ECG examination. Incomplete blockade of the bundle of His bundle has no specific symptoms at all. It is often detected when listening to the myocardium and on the ECG.
Clinical signs of a specific organic disease may occur with complete blockade of the right bundle branch block. It should be noted that a third of patients may experience specific changes with normal listening to heart sounds.
Diagnostics of the blockade of the leg of the bundle of His
To date, the diagnosis of the disease is established on the basis of examination and listening to the patient’s complaints. In addition, ultrasound examinations of the heart and a mandatory ECG are used. Such medical procedures allow you to accurately establish certain disorders in the work of the heart. The presented disease does not cause any difficulties in diagnosis; such disorders are perfectly detected with a complex of several studies.
Treatment and prevention
A typical right bundle branch block usually does not require any treatment. Experts focus on the progressive disease that provokes the presented cardiac disorders. Many young adults without major organic heart disease usually have a relatively good prognosis. It has been proven that the presented isolated blockade of the right branch of the His bundle almost never turns into a complete blockade of the atrioventricular character.
Despite this, there is a rare progression of right bundle branch block to typical second- or third-degree atrioventricular block. If these disorders occur against the background of hypertension, then there is a deterioration in the prognosis, since mortality increases approximately three times. It should be mentioned that cardiomegaly and heart failure also negatively affect the prognosis.
[Video] Cardiologist, kmn Anna Korenevich – blockade of the bundle branch block: