84 year old who experiences syncope.
Question 1: Where do you see the blocked PAC?Question 2: Why does the P wave not conduct?
-Premature atrial complexes
-Left atrial abnormality
Question 1: The PAC is difficult to see because it is imbedded in the T wave of the preceeding beat. Careful inspection of the ST segment and early portion of the T wave in the Lead II rhythm strip will reveal the PAC.
Question 2: The PAC occurs early enough to encounter the AV node during its refractory period.