The nurse is educating a client prior to an electrocardiogram (ECG). What is the best explanation regarding the purpose of electrocardiography?

To measure the pumping strength of the heart

To examine the heart's electrical activity

To evaluate coronary artery blood flow

To visualize the cardiac silhouette

Answer and Explanation

The Correct Answer is B

A. While an ECG can provide insight into the function of the heart, it does not directly measure the pumping strength.

B. The primary purpose of an ECG is to assess the electrical activity of the heart. It measures the timing and strength of electrical signals as they move through the heart muscle, which helps diagnose arrhythmias, myocardial infarction, and other cardiac conditions.

C. An ECG does not evaluate coronary artery blood flow. Tests like coronary angiography or stress tests are used for that purpose.

D. An ECG does not provide a visualization of the heart's size or shape, which would be done through imaging methods like a chest X-ray or echocardiogram.

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Correct Answer is C

Explanation

A. Temperature is not directly related to the effects of nitroglycerin or the client’s need for additional doses.

B. While oxygen saturation is important, it does not directly influence the decision to administer nitroglycerin, which primarily works to relieve chest pain by dilating coronary arteries and reducing myocardial oxygen demand.

C. Nitroglycerin is a vasodilator that can lower blood pressure. It is crucial to check the client’s blood pressure before administering another dose of nitroglycerin because excessive drops in blood pressure can lead to dizziness, fainting, or other complications. If the blood pressure is already low, further administration may be contraindicated.

D. Apical pulse rate is important to monitor but is not the most critical cue in this scenario. Nitroglycerin primarily affects blood pressure and coronary circulation rather than directly influencing heart rate.

A. Troponins T and I B. Creatine kinase (CK) C. Homocysteine (Hcy) D. Myoglobin

Correct Answer is A

Explanation

A. Troponins (specifically troponin I and T) are proteins released when the heart muscle is damaged. They are the most specific and sensitive markers for myocardial injury, especially in diagnosing a myocardial infarction (MI).

B. Creatine kinase (CK) is an enzyme found in various tissues, including the heart. CK-MB is a cardiac isoenzyme, but it is not as specific for myocardial injury as troponins. It can also be elevated in other conditions like muscle injury.

C. Homocysteine (Hcy) is an amino acid that can increase the risk of cardiovascular disease but does not serve as an immediate marker for myocardial damage.

D. Myoglobin is an early marker of muscle injury, but it lacks specificity for myocardial damage as it can also rise in skeletal muscle injury, making it less reliable than troponins.

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The nurse is educating a client prior to an electrocardiogram (ECG). What is the best explanation regarding the purpose of electrocardiography?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

Correct Answer is C

Explanation

The nurse has received the laboratory results for a patient who developed chest pain 4 hours ago and may be having a myocardial infarction. Which of the following laboratory test results are most indicative of myocardial damage?

Correct Answer is A

Explanation

The nurse is educating a client prior to an electrocardiogram (ECG). What is the best explanation regarding the purpose of electrocardiography?

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