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| Sinus rhythms |
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Normal sinus rhythm refers to the usual case in healthy adults where the SA node is the cardiac pacemaker and the heart rate is 60 - 100 beats per minute (BPM). |
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With normal sinus rhythm, expect the following: a normal ECG with P, QRS and T waves |
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| a PR interval of 0.12 - 0.20 seconds | ||||
| a regular interval between each QRS complex (R-R interval) of 0.60 - 1.00 seconds | ||||
| a regular arterial pulse pressure (difference between systolic and diastolic pressures) | ||||
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there may be minor regular variation in heart rate and pulse pressure associated with respiration (sinus arrhythmia) |
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