What produces the clinical Korotkoff sounds heard through a stethoscope (Hard) during arterial blood pressure measurement?
Answer and explanation
Correct answer: D. Turbulent blood flow through the partially compressed brachial artery
- Step 1: When cuff pressure is between systolic and diastolic pressure, the artery is partially occluded during each cycle. Step 2. Jetting of blood through the narrow opening causes turbulent flow and arterial wall vibrations (Korotkoff sounds). Answer: Turbulent blood flow through the partially compressed brachial artery. Why not the others: Laminar flow is silent; closing of heart valves produces S1 and S2 heart sounds; smooth muscle contraction does not generate audible sound.
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