heart block

Question 2

1st degree

Answer 2

slow conduction in the AV node results in incomplete heart block, PR interval is extended (>0.2)

Question 3

mobitz type 1

Answer 3

progressive lengthening of the PR interval

Question 4

mobitz type II

Answer 4

normal PR, ventricular contraction only initiated every 2nd or 3rd atrial contraction

Question 5

3rd degree

Answer 5

complete heart block - no impulses conducted through the affected area- can results from ischemic damage to bundle of His or nodal tissue

Question 6

what is the relationship between QRS and P waves in 3rd degree

Answer 6

the two are independent

Question 7

what is teh HR like in 3rd degree

Answer 7

in the absence of signals from SAN the AVN can generate a HR of about 40bpm

Question 8

CF 3rd degree

Answer 8

difficult to exercise as the heart cannot sustain higher rates - dizzy spells eg syncope

Question 9

treatment of 3rd degree

Answer 9

atropine or ventricular pacing

Question 10

how does supraventicular tachycardia present

Answer 10

episodic sudden onset of very a fast pulse rate, and a fluttering sensation within chest. Pulse at the time can be greater than 200 beats per minute. Each episode lasts typically for few minutes and then reverts spontaneously. 24 hour tape recording normal.