Atrioventricular Block (AV block) - Types of Heart Block Part 2, Animation.
Atrioventricular (AV) block - first, second, third (complete) degree
1st Degree AV Block ECG - EMTprep.com
2nd Degree Type 1 AV Block ECG - EMTprep.com
3rd Degree AV Block ECG - EMTprep.com
Atrioventricular block is a type of heart block in which the conduction between the atria and ventricles of the heart is impaired. Under normal conditions, the sinoatrial node in the atria sets the pace for the heart, and these impulses travel down to the ventricles. In an AV block, this message does not reach the ventricles or is impaired along the way. The ventricles of the heart have their own pacing mechanisms, which can maintain a lowered heart rate in the absence of SA stimulation.