Ask the Clinical Instructor: A Q&A column for those new to the cath lab. (Ask your question, or any question you and your co-wor

Yes, they often do. We'll try to explain why, briefly. A detailed explanation of the ECG identification of what is non-compensatory versus compensatory can be complex and is beyond the scope of this article. We would like to know whether the cause of the pause is atrial or ventricular. Simply put, premature atrial contractions (PACs) often do not display compensatory pauses. The presence of ectopic P waves, usually absent of a full compensatory pause (R-R interval containing the premature contraction is Ask your question, or any question you and your co-workers have had in your cath lab, to tginapp@rcisreview.com

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