<P> 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 . </P>
what is the meaning of sinus rhythm in ecg
cardiac rhythm where depolarization of the cardiac muscle begins at the sinus node