contexts: A sinus rhythm is any cardiac rhythm where depolarization 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 .
name: Sinus rhythm
answers.input_text: short
answers.span_text: cardiac rhythm where depolarization of the cardiac muscle begins at the sinus node
questions.input_text: what is the meaning of sinus rhythm in ecg