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.
When the heart is not pumping sufficient blood because of a slow heartbeat, it may fall into one of the categories of bradycardia. Sick sinus: Normally the electrical messages in the heart begin in a cluster of cells in the right atrium, called the sinus node (SA node). The sinus node is your heart's natural pacemaker. If it is malfunctioning, it can cause the heart to beat too slowly or to alternate between fast and slow beating.