* Normally found in leads: I, AVL, V6, (V5);
- Normal if < 1/2 mm wide or < 0.025 sec;
- Do to Septal depolarization;
- Ignore Q waves in AVR; * Pathologic Q waves:
- Abnormal in V2, V3;
- Greater than 0.03-0.04 sec and/or 1/4 R wave; * Transmural MI: Q waves seen after 24-48 hrs; * Q1, QaVL, S3 (or small RIII):
- consider Anterior Hemiblock * Q3 (small), S1 (small R in I);
- consider Post HemiBlock * Q3/Large S1: consider Pulmonary Infarct * * Non Classical Myocardial infarct Q waves/QS complexes;
- Left BBB: QS in V1, V2;
- COPD: QS in V1-V3;
- Muscular Dystrophy;
- LVH: (2nd to AI): QS in V1-V4;
- IHSS: may have inferolateral q waves:
- WPW: depending on the tract may have q waves;
- Caridac Tamponade: Elect Alternans pattern