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A patient has a blood pressure of 130/105 mm Hg. How should this pulse pressure be classified?
ANormal, since it exceeds one third of systolic
BWide, since it exceeds 100 mm Hg outright
CNarrow, since it is under 25 percent of systolic
DNormal, since diastolic remains above 100 mm Hg
Answer & Solution
Correct answer: C. Narrow, since it is under 25 percent of systolic
1. Pulse pressure here is 130 minus 105, which equals 25 mm Hg.
2. A pulse pressure should be at least 25 percent of the systolic value.
3. Twenty five percent of a systolic 130 mm Hg is 32.5 mm Hg.
4. The measured 25 mm Hg falls below 32.5 mm Hg, so this pulse pressure is low or narrow.
5. A narrow pulse pressure points to a low stroke volume, seen in heart failure, aortic stenosis or major blood loss.
6. A wide pulse pressure means a value at or above 100 mm Hg, which is four times what this patient shows.
7. A high diastolic value on its own says nothing about the gap between the two readings.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 20 "The Cardiovascular System: Blood Vessels and Circulation", section 20.2 Blood Flow, Blood Pressure, and Resistance_
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