Which infection control measure, by the nurse, reduces the potential spread of methicillin-resistant Staphylococcus aureus (MRSA)?
Wearing an N95 mask while in the room of a patient with airborne precautions.
Wearing a facemask while in the room of a patient with droplet precautions.
Use of a separate disposable blood pressure cuff for any patient with a draining wound.
Use of strict hand washing measures once in every 8-hour work shift.
The Correct Answer is C
Choice A rationale
Wearing an N95 mask is appropriate for airborne precautions, such as tuberculosis, but not specifically for MRSA, which requires contact precautions.
Choice B rationale
Wearing a facemask is suitable for droplet precautions, such as influenza, but MRSA is primarily spread through direct contact, not droplets.
Choice C rationale
Using a separate disposable blood pressure cuff for patients with draining wounds helps prevent the spread of MRSA. MRSA can be transmitted via contaminated medical equipment.
Choice D rationale
Strict hand washing measures are essential but should be performed more frequently than once every 8-hour shift. Hand hygiene should be practiced before and after patient contact.
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Correct Answer is B
Explanation
Choice A rationale
Hypercalcemia is characterized by increased calcium levels in the blood, often due to increased absorption of calcium from the gut. However, in chronic kidney disease (CKD), the kidneys’ ability to activate vitamin D is impaired, leading to decreased calcium absorption from the gut, not increased. Therefore, hypercalcemia is not a typical sign of CKD.
Choice B rationale
A positive Chvostek’s sign is indicative of hypocalcemia, which is a common symptom in CKD. The kidneys’ reduced ability to activate vitamin D leads to decreased calcium absorption from the gut, resulting in low calcium levels in the blood. This hypocalcemia can cause neuromuscular irritability, leading to a positive Chvostek’s sign.
Choice C rationale
Tetany is a condition characterized by muscle cramps and spasms, often due to hypocalcemia. In CKD, hypocalcemia occurs due to the kidneys’ inability to activate vitamin D, leading to decreased calcium absorption from the gut. This hypocalcemia can cause hyperexcitability of nerves and muscles, resulting in tetany.
Choice D rationale
Hyperphosphatemia is characterized by high phosphate levels in the blood. In CKD, the kidneys’ ability to excrete phosphate is impaired, leading to its accumulation in the blood. However, this is not directly related to the inability to absorb phosphate from the gut but rather the kidneys’ reduced excretion capacity.
Correct Answer is A
Explanation
Choice A rationale
Enlarged liver (hepatomegaly) and peripheral edema are common clinical manifestations of right heart failure (RHF). RHF leads to congestion of systemic circulation, causing fluid accumulation in the liver and peripheral tissues.
Choice B rationale
Crackles in the lungs are more commonly associated with left-sided heart failure, where fluid backs up into the pulmonary circulation, leading to pulmonary edema.
Choice C rationale
A dry hacking cough is not a typical symptom of right heart failure. It is more commonly associated with respiratory conditions such as asthma or bronchitis.
Choice D rationale
Altered mentation with pinpoint pupils is not a characteristic of right heart failure. These symptoms are more indicative of neurological conditions or opioid overdose.