There are five phases of Korotkoff sounds, each representing different events in the cardiac cycle:
1. Phase I: The first appearance of faint, clear tapping sounds, which gradually increase in intensity. This indicates the systolic blood pressure. 2. Phase II: A swishing or whooshing sound, caused by blood flow turbulence. 3. Phase III: Crisper and louder sounds resembling Phase I, but with a higher pitch. 4. Phase IV: A muffling of the sounds, which become softer and less distinct. 5. Phase V: The disappearance of sounds, indicating the diastolic blood pressure.
