For many White people, particularly those who live in White-centric communities, we never have to consider our own racial identity. I cannot tell you how many times Iâve heard White people called upon to describe their race only to have them say, âIâve never really thought about it. I guess Iâm just normal.â Hell, Iâm pretty sure I was talking this way not too long ago.
Sinus rhythm. A sinus rhythm is any cardiac rhythm where 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.
Although the accepted limits of heart rate are between 60 and 100 beats per minute, this was based for convenience on the scale of the squares on electrocardiogram paper; a better definition of normal sinus heart rate may be between 50 and 90 beats per minute.