A patient with a first-degree atrioventricular block has an ECG showing a constant PR interval of 0.24 seconds. Which interpretation is correct?
Correct answer: B. The PR interval is prolonged but every beat conducts
- A. The atrial impulses are not reaching the ventricles
- B. The PR interval is prolonged but every beat conducts
- C. The ventricles are depolarising before the atria
- D. The atrial rhythm is chaotic and irregular
Explanation
First-degree AV block is defined by a prolonged PR interval, usually more than 0.20 seconds, with every P wave followed by a QRS complex. Complete heart block shows atrial and ventricular activity independently, while chaotic atrial activity suggests atrial fibrillation.
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About Cardiovascular Nursing
Covers assessment and nursing care for hypertension, coronary artery disease, angina, myocardial infarction, heart failure, valvular disease and dysrhythmias. It includes interpreting vital signs and ECG findings, managing chest pain, monitoring cardiac medicines, recognizing complications and distinguishing left-sided from right-sided heart failure.
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