Which of the following clinical manifestations is most indicative of a ventricular septal defect in a newborn?
Varying degrees of cyanosis.
Wide pulse pressure.
Loud, harsh murmur at the left sternal border.
Clubbing of the fingernails.
The Correct Answer is C
Identifying ventricular septal defects (VSD) requires knowledge of cardiac hemodynamics and auscultation. The nurse must understand how high-pressure left-to-right shunting through a structural opening in the septum creates specific acoustic turbulence during the systolic phase of the cardiac cycle.
Choice A rationale
Cyanosis is not typically a primary sign of an isolated VSD because the shunt is left-to-right, meaning oxygenated blood enters the lungs. Cyanosis only occurs if pulmonary hypertension develops, eventually causing a reversal of the blood flow.
Choice B rationale
A wide pulse pressure is a classic clinical finding associated with patent ductus arteriosus (PDA) due to diastolic runoff into the pulmonary circulation. It is not a characteristic finding for a ventricular septal defect in a newborn.
Choice C rationale
The high-pressure gradient between the left and right ventricles forces blood through the defect, creating a holosystolic murmur. This loud, harsh sound is best heard at the lower left sternal border where the turbulent flow occurs.
Choice D rationale
Clubbing of the fingernails is a sign of chronic, long-term hypoxia and is seen in cyanotic heart defects or long-standing uncorrected shunts. It would not be present in a newborn with a recently diagnosed ventricular septal defect.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
This question relates to neonatal assessment techniques and peripheral perfusion monitoring. Knowledge of neonatal anatomy and the importance of securing a probe to a highly vascularized, stable site is necessary to ensure accurate and continuous pulse oximetry readings in newborns.
Choice A rationale
The upper arm is an inappropriate site because the large muscle mass and bone structure can interfere with the light transmission required for pulse oximetry. Additionally, it is difficult to secure the probe firmly enough to prevent motion artifact.
Choice B rationale
While the forehead can be used with specialized sensors, it is not the standard site for a newborn. Constant movement and potential skin irritation from adhesives make it less ideal than peripheral extremities for routine monitoring of oxygen saturation levels.
Choice C rationale
Wrapping the probe around the foot or great toe provides a secure fit on a highly vascularized area. This site minimizes interference from movement and allows for consistent light absorption through the thin skin and subcutaneous tissue of the neonate.
Choice D rationale
The abdomen lacks a thin, bony appendage or a localized vascular bed suitable for transillumination. Pulse oximetry requires a site where light can pass through tissue to a receiver, which is not physically possible across the thick abdominal wall.
Correct Answer is D
Explanation
Identifying specific clinical manifestations of head trauma is essential for neurosurgical nursing. This question requires knowledge of cranial anatomy and the localized signs of base-of-skull injuries. Recognizing these signs allows for the timely assessment of potential cerebrospinal fluid leaks or hemorrhage.
Choice A rationale
The halo sign occurs when cerebrospinal fluid separates from blood on absorbent material, forming a ring. This confirms the presence of a CSF leak from the ears or nose but does not describe mastoid bruising specifically.
Choice B rationale
Cheyne-Stokes respirations involve an abnormal pattern of breathing characterized by progressively deeper and sometimes faster breathing followed by apnea. This indicates severe brainstem injury or increased intracranial pressure rather than a specific fracture location.
Choice C rationale
Raccoon eyes, or periorbital ecchymosis, result from blood tracking into the soft tissue around the eyes. While this indicates a basilar skull fracture, it specifically involves the anterior fossa rather than the mastoid process area.
Choice D rationale
Battle's sign is the classic clinical indicator of a fracture in the posterior cranial fossa. It involves ecchymosis over the mastoid bone. This sign typically appears several days after the initial injury due to vascular extravasation.
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