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 C

Explanation

A. Hypernatremia is incorrect. Furosemide can cause hyponatremia rather than hypernatremia due to increased sodium excretion.
B. Hypocalcemia is incorrect. While loop diuretics can cause some calcium loss, hypocalcemia is less common than hypokalemia.
C. Hypokalemia is correct. Furosemide is a loop diuretic that increases potassium excretion, leading to a risk of hypokalemia, which can cause muscle weakness, arrhythmias, and other complications.
D. Hyperkalemia is incorrect. Furosemide promotes potassium excretion, making hyperkalemia unlikely.

A. First-degree AV block B. Sinus tachycardia C. Atrial fibrillation D. Sinus bradycardia

Correct Answer is C

Explanation

A. First-degree AV block is characterized by a prolonged PR interval but does not typically present with irregular palpitations or a pulse deficit.
B. Sinus tachycardia causes a rapid but regular rhythm, whereas atrial fibrillation is irregularly irregular.
C. Atrial fibrillation is the correct answer. It is characterized by an irregular heart rate, absence of distinct P waves on an ECG, and a pulse deficit due to ineffective atrial contractions leading to incomplete ventricular filling.
D. Sinus bradycardia presents as a slow, regular heart rate rather than a rapid, irregular rhythm with a pulse deficit.

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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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A nurse is caring for a client with heart failure who takes furosemide (Lasix) 20 mg daily at home and is receiving 40 mg of furosemide (Lasix) IV daily in the hospital. The nurse is aware that this patient is at risk for which electrolyte imbalance?

Correct Answer is C

Explanation

A nurse in an urgent care center is assessing a client who reports a sudden onset of irregular palpitations, fatigue, and dizziness. The nurse finds a rapid and irregular heart rate with a significant pulse deficit. Which of the following dysrhythmias should the nurse expect to find on the ECG?

Correct Answer is C

Explanation

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