In a junctional rhythm viewed in lead II, where is the location of the P wave on the ECG if atrial depolarization precedes ventricular depolarization?
a. Before the QRS complex
b. During the QRS complex
c. After the QRS complex
A
If the AV junction paces the heart and the atria depolarize before the ventricles, an inverted P wave will be seen before the QRS complex and the PR interval will usually measure 0.12 seconds or less. The PR interval is shorter than usual because an impulse that begins in the AV junction does not have to travel as far to stimulate the ventricles.
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1. 8 units IV 2. 8 units subcutaneous 3. 12 units subcutaneous 4. 12 units IV
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