Normal Tracing: Difference between revisions
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** [[Conduction#PQ|PQ interval]] 120-200ms | ** [[Conduction#PQ|PQ interval]] 120-200ms | ||
** [[Conduction#QRS|QRS width]] 60-100ms | ** [[Conduction#QRS|QRS width]] 60-100ms | ||
** [[Conduction#QT|QTc interval]] 390-450ms | ** [[Conduction#QT|QTc interval]] 390-450ms (use the [[QTc calculator]] for this) | ||
* [[Heart axis]]: between -30 and +90 degrees | * [[Heart axis]]: between -30 and +90 degrees | ||
* [[P wave morphology]]: | * [[P wave morphology]]: | ||
Revision as of 11:57, 24 July 2007
Characteristics of a normal ECG:
- Rhythm: sinus rhythm
- Rate: 60-100 bpm
- Conduction:
- PQ interval 120-200ms
- QRS width 60-100ms
- QTc interval 390-450ms (use the QTc calculator for this)
- Heart axis: between -30 and +90 degrees
- P wave morphology:
- The maximal height of the P wave is 2.5 mm in leads II and / or III
- The p wave is positive in II and AVF, and bifasic in V1
- The p wave duration is usually shorter than 0.12 seconds
- QRS morphology:
- No pathological Q waves
- No left or right ventricular hypertrophy
- No microvoltations
- Normal R wave propagation. (R waves increase in amplitude from V1-V5)
- ST morphology
- No ST elevation or depression
- T waves should be concordant with the QRS complex
- The ECG should not have changed from the previous ECG