T EKG Tutorial
... The block (eg 2: 1, 3: 2, 4: 3, etc.) may occur, depending on the AV node ... The QRS complexes are narrow in this circumstance and resemble those of sinus rhythm. ...
cmbi.bjmu.edu.cn / UpToDate / ... / ECG tutorial AV block. Htm
Cardiology (full) study [...]