Heart Blocks

Question 1

First degree heart block

Answer 1

consistent delay of conduction at the AV node. Not a true block. Characteristicly long R from P

Question 2

If your R is far from P

Answer 2

it is first degree

Question 3

First degree heart block ECG characteristics

Answer 3

prolonged PR interval, >.2

Question 4

First degree heart block causes

Answer 4

can occur in healthy person for no reason. or could be from cardiac disease like inferior acute MI. Could also be causes by increased vagal tone, Beta blockers, Digoxin or other antidysrhythmics. could also be caused by hypothyroidism.

Question 5

first degree heart block treatment

Answer 5

non indicated, CO is unaffected.

Question 6

first degree heart block precautions

Answer 6

can progress to a higher degree block, especially if prompted by an MI

Question 7

Second degree heart block type I

Answer 7

intermittent block at the AV node

Question 8

Longer longer longer, drop, now you have a Wenckebach

Answer 8

Second degree heart block type I

Question 9

Second degree heart block type I causes

Answer 9

can be in a healthy person, but can also be from an inferior wall MI, or acute myocarditis. can also be caused by drugs like BB, digoxin, etc, increased vagal tone and hyperkalemia.

Question 10

Second degree heart block type I effects

Answer 10

usually transient and reversible. If ventricular beat is dropped frequently can show signs of decreased CO–> chest pain and hypotension.

Question 11

Second degree heart block type I treatment

Answer 11

if showing symptoms, give O2 and start IV line. If HR is slow, can give atropine and transcutaneous pacing.

Question 12

Second degree heart block type I prognosis

Answer 12

may progress to more serious blocks, especially in presence of inferior MI

Question 13

Second degree heart block type I ECG characteristics

Answer 13

patterned irregularity rhythm, PR interval gets progressively longer and then cycle will drop and repeat.

Question 14

Second degree heart block type II

Answer 14

intermittent block at bundle of His or the bundle branches. Results in atrial pulses that are not conducted to the ventricles, so there are more P waves than QRS complexes. This is serious.

Question 15

Second degree heart block type II causes

Answer 15

anterior wall MI, degenerative disease of the AV node or severe CAD. like other blocks can also be caused by BB and medications.

Question 16

If your P’s don’t go through

Answer 16

you have a mobitz type II, Second degree heart block type II

Question 17

Second degree heart block type II effects

Answer 17

decreased CO and hypoperfusion- fatigue, syncope, hypotension, AMS.

Question 18

Second degree heart block type II treatment

Answer 18

Give O2, start IV line and do transcutaneous pacing. If there is a new, wide QRS complex then give atropine while setting up transq pacing.

Question 19

Second degree heart block type II ECG characteristics

Answer 19

atrial rate is not normal, but ventricular rate may be. PR interval is constant, where beats are actually conducted.

Question 20

Second degree heart block type II prognosis

Answer 20

may progress to more severe bloc and ventricular asystole

Question 21

Third degree heart block

Answer 21

complete block of conduction at or below the AV node, so the impulse from the atria cannot reach the ventricles.

Question 22

Third degree heart block causes

Answer 22

usually congenital, but can also be caused from degenerative diseases, anterior or inferior wall MI, etc.

Question 23

Third degree heart block effects

Answer 23

well tolerated, as long as the escape rhythm is fast enough to generate sufficient CO. May see decreased CO and have fatigue, syncope, etc.

Question 24

Third degree heart block treatment

Answer 24

if symptomatic, give O2, start IV line and do transcutateous pacing. If there is a new, wide QRS can give atropine while setting up transq pacing.

Question 25

intrinsic atrial rate

Answer 25

60-100 bpm, by SA node

Question 26

AV junction rate

Answer 26

40-60 bpm. If signaled from here, will have narrow QRS

Question 27

Ventricular rate

Answer 27

20-40 bpm. If signaled from here, will have wide QRS.

Question 28

If your q’s and p’s do not agree

Answer 28

its a Third degree heart block

Question 29

Third degree heart block ECG characteristics

Answer 29

slower ventricular rate (RR), atrial and ventricular rhythms are normal but not related. P wave is normal, but will march through the QRS.

Question 30

First degree heart block ECG

Answer 30

Question 31

second degree heart block type I ECG

Answer 31

Question 32

Second degree heart block type II ECG

Answer 32

Question 33

Third degree heart block ECG

Answer 33