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.
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Defibrillation is the priority intervention for pulseless ventricular tachycardia, as it can restore a normal rhythm. It should be performed as soon as possible.
B. Synchronized cardioversion is used for hemodynamically unstable tachyarrhythmias with a pulse, not for pulseless V-Tach.
C. CPR should be initiated if a defibrillator is not immediately available, but defibrillation is the definitive treatment.
D. Repeating an ECG does not address the immediate life-threatening situation.
Correct Answer is ["A","D","E"]
Explanation
A. Increased blood pressure is expected due to excess fluid in the vascular system, which raises blood volume and pressure.
B. Hematocrit is typically decreased in fluid volume overload due to hemodilution rather than increased.
C. Increased temperature is not a common finding in fluid overload, as fever is usually associated with infection rather than volume excess.
D. Increased heart rate (tachycardia) occurs as the heart compensates for excess fluid and decreased cardiac output.
E. Increased respiratory rate is common due to pulmonary congestion and fluid accumulation in the lungs, leading to dyspnea.
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