A client scheduled for magnetic resonance imaging (MRI) has arrived at the radiology department. The nurse who prepares the client for the MRI should prioritize which of the following actions?
Withholding stimulants 24 to 48 hours prior to exam
Removing all metal-containing objects
Instructing the client to void prior to the MRI
Initiating an IV line for administration of contrast
The Correct Answer is B
An MRI uses strong magnetic fields and radio waves to create detailed images of the body. The most critical safety measure is ensuring the removal of all metal-containing objects, as metal can become a projectile hazard, cause burns, or interfere with image quality. This includes jewelry, hearing aids, belts, and sometimes certain implants. The nurse must prioritize metal screening above all other preparations to prevent serious injury.
Rationale for Correct Answer:
B. Removing all metal-containing objects: Metal objects pose a severe risk in the MRI suite due to the powerful magnetic field. Removing metal is the first priority for safety and must be done before entering the scanner room. This step also ensures image accuracy.
Rationale for Incorrect Answers:
A. Withholding stimulants 24 to 48 hours prior to exam: This is not necessary for most MRI procedures. It may apply to specialized tests like EEGs or cardiac stress testing but not standard MRIs.
C. Instructing the client to void prior to the MRI: While a full bladder may cause some discomfort, it is not dangerous and does not interfere with MRI function. Voiding is not the priority.
D. Initiating an IV line for administration of contrast: This may be required if the MRI is ordered with contrast, but not all MRIs require contrast. Even when needed, IV access is secondary to safety screening for metal.
Key Takeaways:
• Metal screening is the top priority before any MRI to prevent injury and ensure image quality.
• MRIs use magnetic fields, not radiation—making metal objects and implants high-risk items.
• Other preparations like voiding or IV access are important but not as critical as ensuring metal safety compliance.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A positron emission tomography (PET) scan is a functional imaging study that uses a radioactive tracer (often glucose-based) to detect metabolic activity in the body. This scan can be used to identify areas of abnormal brain function, tumors, or degenerative disease. Because the radioactive glucose is injected intravenously, some clients may experience dizziness, lightheadedness, or headache during or after the test as a mild, transient reaction to the tracer or the metabolic shift.
Rationale for Correct Answer:
D. The test may result in dizziness or lightheadedness: Although generally safe, PET scans involve radioactive tracer injection, and clients can experience temporary side effects like dizziness or fatigue. These symptoms are usually mild and resolve quickly, but clients should be informed and monitored.
Rationale for Incorrect Answers
A. The test will temporarily limit blood flow through the brain: PET scans do not limit blood flow; instead, they assess blood flow and glucose metabolism. This statement is inaccurate and misleading.
B. An allergy to iodine precludes getting the radio-opaque dye: PET tracers are not iodine-based. Iodine allergy is relevant for contrast CT scans, but not a contraindication for PET scans.
C. The client will need to endure loud noises during the test: Unlike MRI, PET scans are quiet. There may be some mechanical sounds from the machine, but loud noises are not characteristic of PET imaging.
Key Takeaways:
• PET scans evaluate metabolic activity, not structure, using radioactive tracers.
• Clients may feel lightheaded or dizzy due to tracer injection, but this is usually brief.
• PET scans are quiet, and iodine allergy is not relevant to this procedure.
Correct Answer is ["A","C","D","F"]
Explanation
The components that contribute to intracranial pressure (ICP) are described by the Monro-Kellie doctrine: brain tissue, cerebrospinal fluid (CSF), and blood. The dura mater, as part of the meningeal layers, also influences ICP dynamics.
Rationale for Correct Answers:
A. Brain: The brain tissue itself is one of the primary components of intracranial volume and contributes directly to ICP.
C. Cerebrospinal Fluid: CSF circulates within the ventricles and subarachnoid space and significantly influences ICP.
D. Blood: Cerebral blood volume impacts ICP through changes in arterial or venous flow.
F. Dura mater: The dura mater helps contain the intracranial contents and plays a structural role in pressure regulation.
Rationale for Incorrect Answers:
B. Neurons: While part of brain tissue, individual neurons are not discussed separately in ICP dynamics.
E. Periosteum: This membrane covers the outer surface of bone and is not involved in intracranial volume or pressure regulation.
Key Takeaways:
• Intracranial pressure is determined by the volume of brain tissue, blood, and CSF within the skull.
• The Monro-Kellie doctrine helps explain compensatory changes among these components.
• Structures outside the cranial cavity, such as the periosteum, do not impact ICP.
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