Which finding would most likely prompt a nurse to use a Doppler instrument during the palpation of the dorsalis pedis pulse?
Bounding pulse graded 4+ using fingertips.
Normal 2+ pulse found on one foot only.
A pulse that is thready and difficult to palpate.
Differences in capillary refill time between extremities.
The Correct Answer is C
Choice A reason: A bounding, 4+ pulse is a high-amplitude, forceful pulse often associated with hyperdynamic states, fluid overload, or aortic insufficiency. This finding is easily palpable, so there is absolutely no clinical indication to use a Doppler, as the pulse is clearly present and clinically significant at a high magnitude.
Choice B reason: A normal 2+ pulse is the expected clinical finding. If a pulse is palpable at a 2+ grade, it indicates adequate distal perfusion to that extremity. A Doppler instrument is not indicated for a standard, healthy pulse, as it is designed to detect pulses that are not detectable by manual palpation alone.
Choice C reason: A thready or weak pulse suggests poor cardiac output or peripheral arterial disease. When a peripheral pulse is so weak that it cannot be accurately felt or graded by palpation, the nurse must use a handheld Doppler device to verify the presence, character, and location of blood flow.
Choice D reason: While capillary refill time is an important indicator of tissue perfusion, a delay in this time indicates microvascular circulation issues, not necessarily the status of the major peripheral arteries. Comparing refill times is a standard assessment that does not inherently dictate the use of a Doppler.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: While a foreign body can cause airway obstruction and localized wheezing, it is not the physiological explanation for the diffuse airway changes seen in pneumonia. Pneumonia involves generalized inflammation, whereas foreign body obstruction is typically sudden and localized to a specific bronchial branch.
Choice B reason: While fluid in the alveoli is a hallmark of pneumonia and leads to impaired gas exchange, this physiological process is more directly related to the finding of crackles (rales) due to the air moving through fluid-filled spaces rather than the wheezing associated with bronchial narrowing.
Choice C reason: Increased surface tension in alveoli is characteristic of respiratory distress syndrome (RDS) due to a surfactant deficiency. While it prevents full expansion and causes respiratory distress, it does not typically manifest as wheezing, which is a sound produced by the high-velocity movement of air through constricted airways.
Choice D reason: In pediatric pneumonia, the inflammatory response often leads to significant mucosal edema, cellular infiltration, and the production of viscous secretions within the bronchioles. This narrowing of the airway lumen increases resistance to airflow, causing the turbulence heard as wheezing, and forces the use of accessory muscles, resulting in retractions.
Correct Answer is B
Explanation
Choice A reason: The endocardium is the innermost layer of the heart, consisting of endothelial cells that line the chambers and valves. While it provides a smooth, frictionless surface for blood flow, it does not possess the contractile properties necessary to generate the mechanical force required for pumping blood.
Choice B reason: The myocardium is the thick, muscular middle layer of the heart wall. It is composed of specialized cardiac muscle cells that possess the contractile ability to generate high pressure and force, making it the primary engine responsible for the mechanical pumping action that circulates blood throughout the body.
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Choice C reason: The epicardium is the outer serous layer of the heart wall, also known as the visceral layer of the serous pericardium. It serves a protective function and contains coronary blood vessels and adipose tissue, but it plays no role in the direct contractile force production for blood circulation.
Choice D reason: The pericardium is the fibrous sac that surrounds and protects the heart. It provides physical support and prevents the heart from over-expanding. While it is essential for cardiac health, it is a structural covering and does not contribute to the contractile muscular force of the heart chambers.
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