Pathologic Q waves: Difference between revisions
m (Rossdonaldson1 moved page Q Waves to Pathologic Q waves) |
No edit summary |
||
| Line 4: | Line 4: | ||
**T waves usually broad, tall (>5mm) & upright | **T waves usually broad, tall (>5mm) & upright | ||
**Limb leads may also have ST elevation, rarely >2 mm | **Limb leads may also have ST elevation, rarely >2 mm | ||
*Q waves do not always indicate infarction (see DDX below) | |||
*Must distinguish normal septal q waves from pathologic Q waves: | |||
**Normal septal q wave: <0.04s, low amplitude | |||
**Abnormal septal q wave: >0.04s in I OR in II, III, AND aVF OR V3, V4, V5, AND V6 | |||
*Q-wave equivalents in the precordial leads: | |||
**R-wave diminution or poor R-wave progression | |||
**Reverse R-wave progression (R waves increase then decrease in amplitude) | |||
***Must distinguish from lead misplacement | |||
**Tall R waves in V1, V2 (representing "Q waves" from posterior infarction) | |||
=== Q Wave (Pathologic) DDX === | |||
*Ischemic Q waves | |||
*[[LBBB]] | |||
*[[LVH]] | |||
*Chronic lung disease | |||
*[[Hypertrophic cardiomyopathy]] | |||
*[[Dilated cardiomyopathy]] | |||
==See Also== | ==See Also== | ||
Revision as of 04:17, 25 February 2015
- Significant if >1 box wide or if is 1/3 of entire QRS amplitude
- Early Repolarization:
- ST Elevation most prominent in lat precord leads (V4-6) but no reciprocal changs
- T waves usually broad, tall (>5mm) & upright
- Limb leads may also have ST elevation, rarely >2 mm
- Q waves do not always indicate infarction (see DDX below)
- Must distinguish normal septal q waves from pathologic Q waves:
- Normal septal q wave: <0.04s, low amplitude
- Abnormal septal q wave: >0.04s in I OR in II, III, AND aVF OR V3, V4, V5, AND V6
- Q-wave equivalents in the precordial leads:
- R-wave diminution or poor R-wave progression
- Reverse R-wave progression (R waves increase then decrease in amplitude)
- Must distinguish from lead misplacement
- Tall R waves in V1, V2 (representing "Q waves" from posterior infarction)
Q Wave (Pathologic) DDX
- Ischemic Q waves
- LBBB
- LVH
- Chronic lung disease
- Hypertrophic cardiomyopathy
- Dilated cardiomyopathy