AV Heart Blocks

Question 1

First degree heart block

Answer 1

Rate: that of underlying rhythm

Rhythm: regular

P wave: normal and precede each QRS

PR interval: PROLONGED, > .20 seconds

QRS: less than or= to .12 seconds

Question 2

Second degree heart block type 1

Answer 2

Rate: that of underlying rhythm

Rhythm: IRREGULAR

P wave: MORE P WAVES THAN QRS

PR interval: gets progressively longer

QRS: less than or= to .12 seconds

Question 3

Second degree heart block type 2

Answer 3

Rate: that of underlying rhythm

Rhythm: regular or irregular

P wave: MORE P WAVES THAN QRS

PR interval: CONSTANT, may be normal or prolonged

QRS: normal or wide

Question 4

Third degree heart block

Answer 4

Rate: that of underlying rhythm

Rhythm: regular

P wave: more p waves than QRS, NO RELATIONSHIP TO QRS

PR interval: VARIES GREATLY

QRS: normal or wide