The cause of heart block?

summary

Heart block is also a very common disease. There are many reasons for this disease. When suffering from this disease, we must treat it in time, because if this disease is not treated in time, it will have a serious impact on patients. When suffering from this disease, patients' heart function will also be affected, This disease can occur in any part of the heart, and the symptoms of different parts of the heart are also different. Let's have a detailed understanding of this disease.

The cause of heart block?

The conduction system of the heart is composed of special cardiac myocytes. Its main purpose is to produce and conduct electrocardiographic excitation, so as to excite and contract the myocardium and make the heart beat rhythmically. They include sinoatrial node, internode bundle, atrioventricular node, atrioventricular bundle, left atrioventricular bundle, bundle branch and Purkinje fiber. Sinoatrial node is the highest pacemaker of the heart and has the strongest self-discipline, so it becomes the "headquarters". The impulses from the sinoatrial node are first transmitted to the atrioventricular node through the inter nodal bundle. The atrioventricular node sends out an atrioventricular bundle downward. The atrioventricular bundle is further divided into left and right bundle branches, which become thinner and thinner. Finally, the interwoven network structures, called Purkinje fibers, are formed respectively and terminate in the myocardium. The impulses from the sinoatrial node make the heart beat again and again through these conduction systems, which is usually called sinus rhythm.

Cardiac conduction block is an abnormal state of conduction delay or interruption due to pathological prolongation of refractory period of myocardium. The prolongation of myocardial refractory period may have pathological prolongation of absolute refractory period or relative refractory period, or both. The duration of conduction block may be transient, intermittent or persistent. Persistent conduction block is the result of myocardial organic injury, while transient and intermittent block, in addition to organic factors, can also be caused by increased vagal tension or some drugs.

Pathological prolonged refractory period is affected by many factors, especially heart rate. The refractory period of myocardium changes with the change of cardiac cycle. When the cardiac cycle is shortened, the refractory period will be shortened correspondingly, and when the cardiac cycle is prolonged, it will be prolonged accordingly. The extracardiac factors mainly refer to the nerve and body fluid. When the sympathetic nerve is excited, the refractory period is shortened. When the tension of vagus nerve increases, the refractory period will not be prolonged.

matters needing attention

If the situation is not serious, drugs can be treated well, and some if it is serious, not using surgery for treatment will lead to aggravation of the disease, because if the disease is serious, it will lead to death of patients, so in peacetime must be treated in time.