A student nurse is learning to assess blood pressure. What does the blood pressure measure?
Flow of blood through the circulation
Force of blood against arterial walls
Force of blood against venous walls
Flow of blood through the heart
The Correct Answer is B
When nurses measure BP, they are not simply evaluating blood flow, but rather the pressure exerted by circulating blood on the walls of the arteries during the cardiac cycle.
Rationale for correct answer:
B. Force of blood against arterial walls: Blood pressure specifically refers to the force exerted by the blood on the walls of the arteries as the heart pumps. Systolic pressure is the peak force during ventricular contraction, while diastolic pressure is the residual force during relaxation.
Rationale for incorrect answers:
A. Flow of blood through the circulation: Blood pressure is related to blood flow but does not measure it directly.
C. Force of blood against venous walls: While venous pressure exists, it is much lower than arterial pressure and is not what is measured during routine BP assessment.
D. Flow of blood through the heart: This refers to cardiac output or blood volume, not pressure. Blood pressure reflects resistance and force in the arteries, not the amount of blood passing through the heart chambers.
Take-home points:
- Blood pressure is the force of blood against the arterial walls, not a direct measure of blood flow or heart volume.
- Accurate understanding of BP helps nurses assess for hypertension, hypotension, and perfusion status, and supports safe clinical decision-making.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["C","D","E"]
Explanation
In clients who have had a stroke, especially those with facial drooping, dysphagia (difficulty swallowing), or immobility, the nurse must choose a method of taking temperature that minimizes risk (e.g., aspiration or injury) and provides consistent, accurate readings.
Rationale for correct answer:
C. Axillary: Safe, noninvasive, and easy to perform even in clients with limited mobility. While it is less accurate than core sites, it’s a reasonable alternative when oral and rectal sites are contraindicated.
D. Tympanic: Quick, noninvasive, and reflects core temperature well. Not affected by oral or facial dysfunctions. Can be performed even when the client has limited cooperation.
E. Temporal artery: Noninvasive, fast, and generally well tolerated. Can be used in immobile or neurologically impaired clients without requiring cooperation.
Rationale for incorrect answers:
A. Oral: Oral temperature measurement requires the client to close their mouth tightly around the probe, which is compromised by facial drooping and dysphagia.
B. Rectal: While rectal temperature is accurate, it is invasive and can be uncomfortable, particularly in older or immobile clients.
Take-home points:
- Avoid oral and rectal routes in clients with neurologic deficits, swallowing issues, or limited mobility due to safety concerns.
- Axillary, tympanic, and temporal artery methods are safe, noninvasive, and appropriate for clients with stroke-related impairments.
Correct Answer is ["A","B","C","D"]
Explanation
Pneumonia typically causes fever, tachypnea, increased heart rate, and reduced oxygen saturation. Treatment goals include reducing fever and infection, improving oxygenation, and relieving respiratory distress.
Rationale for correct answers:
A. Temperature: 37°C (98.6°F): This indicates that the fever has resolved, showing the antibiotics may be working and inflammation is decreasing.
B. Radial pulse: 98: The heart rate decreased from 112 to 98 bpm, reflecting reduced sympathetic response (less fever, improved oxygenation).
C. Respiratory rate: 18: A drop from 22 to 18 breaths/min indicates eased breathing, improved oxygen exchange, and reduced respiratory distress.
D. Oxygen saturation: 96%: An increase from 94% to 96% on 2 L oxygen suggests better gas exchange and alveolar function.
Rationale for incorrect answers:
E. Blood pressure: 134/78: Clinically stable but not the best indicator of pneumonia recovery. BP has remained within the normal range and is slightly lower than baseline (138/82).
Take-home points:
- Positive treatment outcomes in pneumonia include lowered fever, normalized respiratory rate, improved oxygen saturation, and decreasing heart rate.
- While blood pressure stability is important, it is less specific for tracking pneumonia recovery compared to respiratory and oxygenation parameters.
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