Asymptomatic atrioventricular block?

summary

In the process of cardiac electrical conduction, abnormal electrical conduction between atrium and ventricle can lead to arrhythmia, making the heart unable to contract and pump blood normally, which is called atrioventricular block. Atrioventricular block can occur in the atrioventricular node, his bundle and bundle branch. According to the degree of block, it can be divided into first degree, second degree and third degree atrioventricular block. Three types of atrioventricular block have different clinical manifestations, prognosis and treatment. Asymptomatic atrioventricular block? Let's talk about it

Asymptomatic atrioventricular block?

Patients with first degree atrioventricular block are often asymptomatic. During auscultation, the first apical heart sound was weakened, which was due to the prolongation of P-R interval and the close of atrioventricular leaflet at the beginning of ventricular contraction.

Patients with second degree type I atrioventricular block may feel cardiac arrest. Patients with type II atrioventricular block often develop into complete atrioventricular block in a short time due to fatigue, dizziness, syncope, convulsion and cardiac insufficiency. Whether the rhythm is regular or not during auscultation depends on the change of atrioventricular conduction ratio.

The symptoms of complete atrioventricular block depend on the establishment of ventricular autonomic rhythm and the basic condition of ventricular rate and myocardium. If ventricular autonomic rhythm is not established in time, ventricular arrest occurs. If the autonomic rhythm point is higher and just below his bundle, the ventricular rate can reach 40-60 beats / min faster, the patient may have no symptoms. Patients with double bundle branch disease have very low ventricular autonomic rhythm points and slow ventricular rate below 40 beats / min. they may have cardiac insufficiency, Adams Stokes syndrome or sudden death. Slow ventricular rate often leads to increased systolic pressure and pulse pressure.

matters needing attention

(1) Rest properly to avoid emotional tension and fatigue（ 2) If the heart rate is more than 50 beats / min and there is no symptom, the patients with degree I and degree II atrioventricular block need not be treated（ 3) If it is caused by digitalis and other drugs, the drug should be stopped immediately（ 4) If the patient's heart rate is lower than 40 beats / min and suddenly appears convulsion or coma, he should be sent to the hospital for rescue as soon as possible.