What is the first sound heard when measuring blood pressure called?

The first sound heard when measuring blood pressure is referred to as systolic pressure. This sound is detected through a stethoscope over the brachial artery while the cuff is deflating. As the pressure in the cuff decreases, blood begins to flow through the artery and creates a sound, known as the Korotkoff sounds, which indicates the systolic pressure. It represents the peak pressure in the arteries when the heart contracts and pumps blood. Understanding this concept is crucial for accurately assessing a patient's blood pressure and ensuring proper clinical practice.

Other terms, such as diastolic pressure, pulse pressure, and baseline pressure, refer to different aspects of blood pressure measurement or cardiac function. Diastolic pressure indicates the pressure in the arteries when the heart is at rest between beats, pulse pressure is the difference between systolic and diastolic pressures, and baseline pressure is not typically used in this context. This clarity helps differentiate the critical stages and values in blood pressure readings.