A nurse is reviewing cardiac rhythms and heart blocks for a critical care course. The nurse is aware that which of the following describes first-degree heart block?

R-R is irregular

There are absent P waves

PR interval greater than 0.20 seconds in duration.

The PR interval gets longer then drops.

Answer and Explanation

The Correct Answer is C

A. First-degree heart block has a regular R-R interval, meaning the rhythm is typically regular.
B. The presence of P waves is a distinguishing feature of first-degree heart block. Absent P waves are more characteristic of atrial fibrillation or junctional rhythms.
C. First-degree heart block is characterized by a prolonged PR interval greater than 0.20 seconds, but all impulses are still conducted to the ventricles.
D. A progressively lengthening PR interval followed by a dropped QRS complex is indicative of second-degree Mobitz Type I (Wenckebach) heart block, not first-degree heart block.

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Correct Answer is ["10"]

Explanation

Determine the heparin concentration:
- You have 25,000 units of heparin in 250 mL of normal saline.
- Concentration = 25,000 units / 250 mL = 100 units/mL
Calculate the mL/hr rate:
- The order is for 1,000 units/hour.
- Drip rate (mL/hr) = 1,000 units/hour / 100 units/mL = 10 mL/hour

Answer = 10mL/hr

A. Lanoxin increases the force of cardiac contractions. B. Lanoxin decreases the force of cardiac contractions. C. Lanoxin order should be questioned in this diagnosis. D. Lanoxin increases the heart rate.

Correct Answer is A

Explanation

A. Digoxin is a positive inotropic agent, meaning it increases the force of cardiac contractions. This helps improve cardiac output in patients with heart failure.
B. Digoxin does not decrease the force of contractions; instead, it strengthens them, making it beneficial for heart failure treatment.
C. Digoxin is commonly used in heart failure management, particularly in cases of systolic dysfunction or atrial fibrillation.
D. Digoxin decreases heart rate by slowing conduction through the atrioventricular (AV) node, making it useful in atrial fibrillation, but its primary benefit in heart failure is increasing contractility.

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A nurse is reviewing cardiac rhythms and heart blocks for a critical care course. The nurse is aware that which of the following describes first-degree heart block?

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Naxlex Comprehensive Predictor Exams

A Nurse is preparing to start a heparin drip on a client with acute coronary syndrome. Ordered: Give Heparin 1000 units per hour, standard dilution of 25,000 units in 250 mL of normal saline. What is the correct drip setting for the pump in mL/hr?

Correct Answer is ["10"]

Explanation

A nurse is caring for a client with heart failure (HF) and preparing to give a daily dose of Digoxin (Lanoxin). The nurse understands the rationale for giving this medication for HF is which of the following?

Correct Answer is A

Explanation

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