Rhythm Part II

Question 1

Sinus block

Answer 1

An unhealthy SA node that temporarily fails to pace for at least one cycle. The absent p wave is a very important feature

Question 2

First degree AV block

Answer 2

Retards AV node conduction, prolonging the PR interval

Question 3

Second degree block type I

Answer 3

Produces a series of cycles with progressive blocking of AV node conduction

Question 4

Second degree type II (Mobitz)

Answer 4

Usually produce a series of cycles consisting of one normal cycle preceded by a series of paced p waves that fail to conduct through the purkinje fibers