Question: First degree av block seen in which area?
Disambiguated questions and answers: question: First degree av block disease most often seen in which area?
First degree av block slow conduction seen in which area?
First degree av block seen in which area of an EKG?
answer: AV node
ventricles
PR interval
Natural Questions answer: the atrioventricular node (from the Wikipedia article "First-degree atrioventricular block")