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Sinus tachycardia = sinus rhythm with heart rate >100 BPM in adults (or above normal ageadjusted range in children) Sinus arrhythmia = sinus rhythm with beattobeat variation in the PP interval (ie, time between successive P waves);A sinus rhythm is any cardiac rhythm in which depolarisation of the cardiac muscle begins at the sinus node It is characterised by the presence of correctly oriented P waves on the electrocardiogram (ECG) Sinus rhythm is necessary, but not sufficient, for normal electrical activity within the heart The term normal sinus rhythm (NSR) is sometimes used to denote a specific type of sinusJun 01,  · An arrhythmia is an uneven heart rhythm Learn more about the symptoms, causes, types, risk factors, diagnosis, treatment, complications, and prevention of arrhythmia Ecg Abnormalities Can Predict Covid 19 Mortality Abnormal sinus rhythm ecg