Diagnostic criteria

  The QRS width is equal to or more than

           
110 ms in adults,

           
90 ms in children of ages 8-16 years,

           
80 ms in children under 8 years of age.

  The ECG findings do not fulfill the criteria for right bundle branch block or left bundle branch block.

  If precordial leads resemble RBBB and limb leads resemble LBBB (or vice versa),

      it is also considered as intraventricular conduction disturbance.




Reference

  Circulation 2009;119:e235-e240 .





ECG 1. Intraventricular conduction disturbance.
The ECG findings do not fulfill the criteria for right or left bundle branch block (LBBB).
By definition, lead I does not show q waves in LBBB.

Click here for a more detailed ECG





ECG 2. The ECG above belongs to a patient with dilated cardiomyopathy and normal coronary arteries.
Intraventricular conduction disturbance, left axis deviation and negative T waves in the anterolateral leads are seen.

Click here for a more detailed ECG





ECG 3. First degree AV block (long PR interval) and intraventricular conduction delay.

Click here for a more detailed ECG





ECG 4. The ECG above is from a middle-aged woman with severely depressed left ventricular systolic function and shows
intraventricular conduction delay with mild PR interval prolongation (1st degree AV block).

Click here for a more detailed ECG





ECG 5. Intraventricular conduction delay from another patient. The rhythm is atrial fibrillation.

Click here for a more detailed ECG





ECG 6. Intraventricular conduction delay in a 77 years-old man with unstable angina pectoris.
Coronary arteriogram showed 3-vessel disease.

Click here for a more detailed ECG