medical Definition of natural 1: having, constituting, or relating to a classification based on features existing in nature 2: of or relating to nature as an object of study and research
The apical pulse is a measure of cardiac function that is completed by placing a stethoscope at the apex of the heart and counting for one minute. It represents the opening and closing of the valves in the heart.
To take an apical pulse a stethoscope and a stop-watch or a clock with a second hand are needed. To locate the apical pulsation anatomical landmarks are used. First locate the first intercostal space (the space between the first and second rib) on the left side of the chest. Count down to the fifth intercostal space (between the fifth and sixth rib).