A nurse is assisting with teaching a newly licensed nurse about heart sounds. Which of the following sounds is heard when the aortic and pulmonic valves close?
S1
S2
S3
S4
The Correct Answer is B
Choice A reason : S1 represents the sound made by the closure of the atrioventricular valves (mitral and tricuspid valves) and is not the sound associated with the closure of the aortic and pulmonic valves.
Choice B reason : S2 is the sound heard when the aortic and pulmonic valves close. It is often described as a "dub" and occurs at the end of ventricular systole.
Choice C reason : S3 is a rare extra heart sound that follows S2 and usually indicates an increase in left ventricular filling pressure, which can be found in conditions such as heart failure.
Choice D reason : S4 is another extra heart sound that occurs just before S1. It is typically associated with a stiff or hypertrophic ventricle and is not related to the closure of the aortic and pulmonic valves
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason : A low sodium diet is often prescribed for patients with heart conditions to help manage blood pressure and fluid retention. It is not typically something that would need to be questioned in the context of recent pacemaker surgery.
Choice B reason : Checking serum cardiac enzyme levels is a common practice after heart surgery to monitor for any signs of damage to the heart muscle. This would not typically be questioned unless there were specific contraindications for the patient.
Choice C reason : An MRI of the chest should be questioned because MRI machines use strong magnetic fields that can interfere with the functioning of a pacemaker. Unless the pacemaker is specifically labeled as MRI-safe, this type of imaging could be dangerous for the patient.
Choice D reason : Physical therapy is a standard part of recovery after many types of surgery, including pacemaker insertion, to help the patient regain strength and mobility. It would not typically be questioned unless the patient had specific restrictions.
Correct Answer is B
Explanation
Choice A reason : An erythrocyte sedimentation rate (ESR) test is not directly related to high serum potassium levels and would not be the immediate action in response to hyperkalemia.
Choice B reason : Obtaining a 12-lead ECG is a critical step when hyperkalemia is suspected because high potassium levels can cause life-threatening cardiac arrhythmias. An ECG can quickly reveal characteristic changes associated with hyperkalemia, allowing for prompt treatment.
Choice C reason : Administering potassium gluconate would be contraindicated in a patient with hyperkalemia, as it would further increase the serum potassium levels, potentially leading to severe complications.
Choice D reason : Restricting fluid intake is not a standard treatment for hyperkalemia. The management of hyperkalemia may include medications or procedures that promote the excretion of potassium or move potassium from the blood into the cells.
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