The difference between sinoatrial block and atrioventricular block mainly consists of the difference in the site of the lesion and the electrocardiographic difference.
Normal electrocardiographic activity has a sinus node initiation via the inter-nodal bundle → interatrial bundle → atrioventricular node → Hitchcock’s bundle → left and right bundle branches → Purkinje fibers. The difference between sinoatrial block and atrioventricular block mainly includes the following aspects:
1. Lesion site: the main lesion site of sinus-atrial block is between the sinus node and the interjunctional bundle, and the electrocardiographic conduction to the atrioventricular node and the following parts of the delay or block; the main lesion site of atrioventricular block is in the atrioventricular node and the following parts of the atrioventricular node.
2. Electrocardiogram: Electrocardiogram reflects the electrical activity generated by myocardial contraction, but it cannot reflect the electrical activity of sinus node. Sinus atrioventricular block is usually characterized by prolongation or disappearance of P wave; atrioventricular block is mainly characterized by prolongation of the time between P wave and QRS wave, or disappearance of QRS wave after P wave, and severe atrioventricular block will have atrioventricular separation in the electrocardiogram.
When the presence of ECG abnormalities is detected, one should immediately seek medical attention in a hospital to assess the severity of the condition and follow the doctor’s instructions for treatment or follow-up, as severe abnormalities in cardiac electrical activity can lead to sudden death at any time, resulting in death.