|«Step 5: P wave morphology||Step 7: ST morphology»|
|Author(s)||J.S.S.G. de Jong, MD|
|Moderator||J.S.S.G. de Jong, MD|
|some notes about authorship|
The basic questions in judging QRS morphology are:
- Are there any pathological Q waves as a sign of previous myocardial infarction?
- Are there signs of left or right ventricular hypertrophy?
- Does the QRS complex show microvoltage (roughly QRS < 5mm)?
- Is the conduction normal or prolonged (QRS-interval > 0,12s)?
- Is the R wave propagation normal? Normally R waves become larger from V1-V5. At V5 it should be maximal. If the R wave in V2 is larger than in V3, this could be a sign of a (previous) posterior myocardial infarction. Other causes are noted in the chapter Clockwise and Counterclockwise rotation.
If all these items are normal you can go on to the next step: ST morphology.