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* [[Rhythm]]: [[Sinus node rhythms and arrhythmias|sinus rhythm]] | * '''[[Rhythm]]''': [[Sinus node rhythms and arrhythmias|sinus rhythm]] | ||
* [[Rate]]: 60-100 bpm | * '''[[Rate]]''': 60-100 bpm | ||
* [[Conduction]]: | * '''[[Conduction]]''': | ||
** [[Conduction#The PQ interval|PQ interval]] 120-200ms | ** [[Conduction#The PQ interval|PQ interval]] 120-200ms | ||
** [[Conduction#The QRS interval|QRS width]] 60-100ms | ** [[Conduction#The QRS interval|QRS width]] 60-100ms | ||
** [[Conduction#The QT interval|QTc interval]] 390-450ms (use the [[QTc calculator]] for this) | ** [[Conduction#The QT interval|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]]''': | ||
** The maximal height of the P wave is 2.5 mm in leads II and / or III | ** 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 is positive in II and AVF, and bifasic in V1 | ||
** The p wave duration is usually shorter than 0.12 seconds | ** The p wave duration is usually shorter than 0.12 seconds | ||
* [[QRS morphology]]: | * '''[[QRS morphology]]''': | ||
**No [[Q waves|pathological Q waves]] | **No [[Q waves|pathological Q waves]] | ||
**No left or right ventricular [[hypertrophy]] | **No left or right ventricular [[hypertrophy]] | ||
**No [[microvoltations]] | **No [[microvoltations]] | ||
**Normal R wave propagation. (R waves increase in amplitude from V1-V5) | **Normal R wave propagation. (R waves increase in amplitude from V1-V5) | ||
* [[ST morphology]] | * '''[[ST morphology]]''' | ||
**No [[ST morphology|ST elevation or depression]] | **No [[ST morphology|ST elevation or depression]] | ||
**T waves should be [[ST morphology|concordant with the QRS complex]] | **T waves should be [[ST morphology|concordant with the QRS complex]] | ||