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?

Answer and Explanation

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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Correct Answer is D

Explanation

Choice A reason: The PR interval, which is the time from the onset of atrial depolarization (beginning of the P wave) to the onset of ventricular depolarization (beginning of the QRS complex), normally ranges from 0.12 to 0.20 seconds. A PR interval of 0.15 second is within the normal range and does not indicate an acute myocardial infarction.

Choice B reason: The QT interval represents the total time for ventricular depolarization and repolarization. The normal QT interval varies based on heart rate and gender but is typically less than half of the R-R interval in a normal heart rhythm. Therefore, a QT interval equal to the R-R interval is abnormally prolonged, which may suggest other conditions but is not a specific indicator of acute myocardial infarction.

Choice C reason: The QRS complex reflects ventricular depolarization and normally ranges from 0.06 to 0.10 seconds. A QRS interval of 0.08 second is within the normal range and does not suggest an acute myocardial infarction.

Choice D reason: ST segment elevation is a critical finding in the diagnosis of acute myocardial infarction. The ST segment should be at the isoelectric line; elevation above this line is indicative of myocardial injury and is a key diagnostic criterion for ST-elevation myocardial infarction (STEMI). An elevated ST segment is often seen in the early stages of an acute myocardial infarction and requires immediate medical attention.

A. "I will not go barefoot." B. "I will use a thermometer to check the temperature of my bath water." C. "I will wear stockings with elastic tops." D. "I will avoid crossing my legs at the knees."

Correct Answer is C

Explanation

Choice A reason : Advising a client with PVD not to go barefoot is correct. Going barefoot can increase the risk of injury to the feet, which can be particularly dangerous in individuals with PVD due to poor circulation. Any injuries to the feet may heal poorly and can lead to complications such as ulcers or infections.

Choice B reason : Using a thermometer to check the temperature of bath water is a recommended practice for clients with PVD. Due to potential nerve damage and reduced sensation in the extremities, clients may not accurately gauge water temperature, leading to burns. Therefore, using a thermometer helps prevent thermal injury.

Choice C reason : Wearing stockings with elastic tops is not recommended for clients with PVD. Elastic tops can constrict blood flow in the legs, exacerbating circulation problems. Instead, clients should wear non-constricting, well-fitting socks or stockings that promote blood flow.

Choice D reason : Avoiding crossing legs at the knees is good advice for clients with PVD. Crossing the legs can restrict blood flow to the lower extremities, which is already compromised in PVD. Keeping the legs uncrossed and elevating them when possible can help improve circulation.

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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?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

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Correct Answer is D

Explanation

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Correct Answer is C

Explanation

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