The ECG you are looking at has one P wave for every QRS complex and the PR interval is 0.30 sec. What is your interpretation?
a. First-degree heart block
b. Right-axis deviation
c. Third-degree heart block
d. Atrial hypertrophy
ANS: A
In first-degree heart block, the PR interval is longer than 0.20 sec. In addition, there is one P wave before each QRS complex.
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