If a person has a blood pressure of 130/90, which of the following would be true?

Question

BlackTom AI · Accepted Answer

Pulse pressure equals systolic minus diastolic, so for 130/90 the pulse pressure = 130 − 90 = 40 mmHg.

1) Relevant knowledge points and concepts
- Systolic blood pressure (SBP) is the higher number (pressure during ventricular contraction). Diastolic blood pressure (DBP) is the lower number (pressure during ventricular relaxation). Units are mmHg.
- Pulse pressure (PP) = SBP − DBP.
- Mean arterial pressure (MAP) can be approximated by MAP ≈ DBP + 1/3·(PP) or equivalently MAP ≈ (2·DBP + SBP)/3 because the heart spends more time in diastole.

2) Step-by-step reasoning
- Identify SBP = 130 mmHg and DBP = 90 mmHg from the reading 130/90.
- Compute PP using the definition: PP = SBP − DBP.

3) Calculations (intermediate steps shown)
- PP = 130 mmHg − 90 mmHg
- PP = 40 mmHg

Compute MAP for clarity:
- PP = 40 mmHg, so MAP ≈ DBP + 1/3·PP = 90 + (1/3 × 40) = 90 + 13.333... = 103.333... mmHg
- Or using the alternative formula: MAP ≈ (2·90 + 130)/3 = (180 + 130)/3 = 310/3 = 103.333... mmHg

4) Why the correct answer is correct
- The option "The pulse pressure is 40mmHg" directly follows from subtracting diastolic from systolic (130 − 90 = 40). This matches the standard definition and numeric result.

5) Why the other options are incorrect
- "The diastolic pressure is 130mmHg" is wrong because 130 mmHg is the systolic value, not diastolic. The diastolic given is 90 mmHg.
- "MAP is 140mmHg" is incorrect: the correct approximate MAP for 130/90 is about 103.3 mmHg, not 140 mmHg.
- "The systolic pressure is 90mmHg" is wrong because systolic is the first/higher number (130 mmHg); 90 mmHg is the diastolic value.

6) Conclusion
The correct choice is "The pulse pressure is 40mmHg," which matches the provided answer.

If a person has a blood pressure of 130/90, which of the following would be true?单项选择题

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