The change in the character of the sounds during blood pressure measurement is known as the ________.

The change in the character of the sounds during blood pressure measurement is known as the first diastolic sound. This sound marks the transition from the higher pressure phase of systole to the lower pressure phase of diastole. During blood pressure measurement, the first sound heard through the stethoscope corresponds to the systolic pressure, while the subsequent change in sound indicates the onset of diastolic pressure. The first diastolic sound is essential for determining the diastolic reading, as it signifies the point at which the heart begins to relax and the blood flow is less turbulent. Understanding these sounds allows for accurate assessment of blood pressure and evaluation of cardiovascular health.