A patient admitted to the unit displays the following cardiac rhythm on telemetry. What is the estimated heart rate?
120 beats/minute
80 beats/minute
40 beats/minute
Unable to calculate with the strip provided.
The Correct Answer is B
The RR interval is 7.5 big boxes, multiplied by 10 makes it 75, rounded off is 80 beats per minute.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. "Cardiac enzymes assist in diagnosing the presence of pulmonary congestion.": Cardiac enzymes are not used to diagnose pulmonary congestion. They are specific markers used to assess damage to the heart muscle, particularly after a myocardial infarction (MI).
B. "These tests help determine the degree of damage to the heart tissues.": This statement is correct. Cardiac enzyme studies, such as troponin levels, CK-MB (creatine kinase-MB), and LDH (lactate dehydrogenase), are used to evaluate the extent of myocardial damage during and after an MI. Elevated levels of these enzymes indicate myocardial injury.
C. "These tests will enable the provider to determine the heart structure.": While cardiac imaging studies like echocardiograms or angiograms are used to assess heart structure, cardiac enzymes are primarily used to evaluate myocardial damage and not heart structure.
D. "Cardiac enzymes will identify the location of the MI.": Cardiac enzymes can indicate the presence of an MI and the extent of myocardial damage, but they do not specifically identify the location of the MI within the heart. Additional diagnostic tests, such as electrocardiograms (ECGs) and imaging studies, are often used to determine the location of the MI.
Correct Answer is ["5"]
Explanation
To calculate how many milliliters (mL) of metoprolol 1 mg/mL solution should be administered to deliver a 5 mg IV bolus dose, you can use the following formula:
Dose (mL) = Desired dose (mg) / Concentration (mg/mL)
In this case:
Desired dose = 5 mg
Concentration = 1 mg/mL
Dose (mL) = 5 mg / 1 mg/mL = 5 mL
Therefore, the nurse should administer 5 mL of metoprolol 1 mg/mL solution per dose to deliver a 5 mg IV bolus for heart rate control.
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