View source for Second-degree atrioventricular block type 1

[[en:Second-dergree atrioventricular block type 1]]
[[ru:Атриовентрикулярная блокада II степени Мобитц 1]]
Second-dergree atrioventricular block type1 occurs when part of the impulses from the [[sinus cardiac pacemaker|sinus node]] do not pass via [[Atrioventricular (AV) node|atrioventricular connection]] and do not come to the ventricles. Consequently, this part of the sinus impulses, blocked by the atrioventricular connection, cannot cause ventricular excitation. Therefore, there is no QRS complex, displaying a ventricular excitation, after P wave (atrial excitation) on an electrocardiogram. Thus, sinus impulses, passed atrioventricular node, lead to the formation of QRS complex. This is clearly to be seen on ECG: QRS complex will be recorded after P wave. On the contrary, sinus impulses, that have not passed atrioventricular node, will be "lonely", without communication with QRS complex, which is clearly seen on the electrocardiogram: isoelectric straight line records after P wave on ECG.

If the heart rate becomes less than 50 beats / min, and the patient has symptoms, the aim of treatment is to increase heart rate, because [[bradycardia]] contributes inadequate circulation (both systemic and in coronary arteries).

This pathology can be detected using ECG Dongle [https://cardio-cloud.ru/good/1] and ECG Dongle Full [https://cardio-cloud.ru/good/2].