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| Línea 34: | Línea 34: | ||
*Significant if >1 box wide or if is 1/3 of entire QRS amplitude | *Significant if >1 box wide or if is 1/3 of entire QRS amplitude | ||
*Early Repolarization: | *Early Repolarization: | ||
**ST | **[[ST Elevation]] most prominent in lat precord leads (V4-6) but no reciprocal changs | ||
**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 | ||
| Línea 44: | Línea 44: | ||
*Deep symmetrical inverted T waves: | *Deep symmetrical inverted T waves: | ||
#Left ventricle apical hypertrophy | #Left ventricle apical hypertrophy | ||
#Raised ICP (e.g.SAH) | #Raised ICP (e.g. [[SAH]]) | ||
#Wellen's (MI) | #Wellen's (MI) | ||
#Paced rhythm | #Paced rhythm | ||
#BBB's or WPW | #BBB's or [[WPW]] | ||
#Idiopathic | #Idiopathic | ||
== [[RAE]] | ==Hypertrophy/Enlargement== | ||
*[[RAE]] | |||
*[[LAE]] | |||
*[[LVH]] | |||
*[[RVH]] | |||
==Blocks== | ==Blocks== | ||
Revisión del 03:27 13 ene 2014
General
- 1 small box = 1mm = 0.04 sec = 40 miliseconds
- 5 small boxes = 1 big box = 5mm = 0.2 sec = 200 miliseconds
- Entire ECG strip is ~10 seconds
Intervals
| Interval | Time (s) | Boxes |
| PR | 0.12 - 0.20 | 3-5 |
| QRS | .06 - 0.10 | 1.5-2.5 |
| QTc | <0.44 | N/A |
Axis
- Cannot be measured if BBBs are present
- If up in leads 1 and AVF then normal axis
Q waves
- 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
T waves
- Normally upright in 1, 2, V3-V6
- Negative in AVR
- If is greater than 2/3 height of R wave then is abnormal
- Deep symmetrical inverted T waves:
- Left ventricle apical hypertrophy
- Raised ICP (e.g. SAH)
- Wellen's (MI)
- Paced rhythm
- BBB's or WPW
- Idiopathic
Hypertrophy/Enlargement
Blocks
Low Voltage
- QRS < 5 mm in limb leads, or
- QRS < 10 mm in chest leads
- From either low electrical power within the heart (e.g. hypothyroidism), or low conduction within the heart (e.g. sarcoid or scar tissue), or poor conduction from the heart to the ECG lead (e.g. obesity, COPD, pericardial effusion
- Low voltage + tachycardia = pericardial effusion until proven otherwise
See Also
Source
- Adapted from Niemann, Lampe, Pani, Donaldson, ECGpedia.org
- Journal of Electrocardiology. Vol 43 (2010). 40-42.