How should you handle an auscultatory gap during measurement?

• A. Deflate slowly, re-inflate to about 20–30 mmHg above the first sound, and re-check; consider using palpatory SBP to corroborate if needed.
• B. Ignore the gap and record the first reading.
• C. Immediately replace the cuff.
• D. Stop measurement and switch to an oscillometric device.

Answer: (C)

An auscultatory gap is a temporary disappearance of the Korotkoff sounds between systolic and diastolic pressures, often seen in older or hypertensive patients. When you encounter it, don’t lock in the first sound as the systolic pressure. Instead, deflate slowly and re-check. If the gap makes it hard to locate the systolic level, reinflate to about 20–30 mmHg above the initial sound and re-check to bring the sounds back. If needed, corroborate the systolic pressure with palpation by feeling the artery while inflating; the pressure at which the pulse reappears (or is lost during inflation) helps confirm the true SBP. Once the sounds reappear on deflation, continue measuring to determine the diastolic pressure as usual. This approach avoids underestimating systolic pressure and doesn’t require replacing the cuff or switching devices simply because of an auscultatory gap.