Identifying Dysrhythmias: Lesson 5: Atrioventricular Blocks

Identifying Dysrhythmias: Lesson 5: Atrioventricular Blocks
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Characterized by a consistently pro-
longed PR interval
PR interval greater than 0.2 second or
First degree AV block
one large square
Not necessarily a "block" but rather a
"delay"
-Progressively prolonging P-R interval
until the beat is dropped
-repeats
Second degree AV block type 1
-make sure you count out several sets to
verify
-regularly irregular
intermittent interruptions of AV conduc-
Second Degree AV Block Type 2 tion; *QRS's just drop off with no warn-
ing*
Heart rhythm that occurs when the atria
and ventricles contract independently
Third degree AV block (complete heart because of the inability of any atrial im-
block) pulses to reach the ventricles. (two rhy-
thins happen, PR interval is variable and
there is an excape rhythm present.)
impulse is delayed or blocked within the
bundle branch block bundle branches of the normal conduc-
tion pathway
Most likely to result in a symptomatic pa-
second-degree AV block type II and
tient (lightheadedness, dyspnea or chest
third-degree AV block.
pain)?
What is the key PR interval characteristic PR varies and has no relationship to the
of third-degree AV block? QRS
PR is consistent for all conducted beats,
What is the key PR interval characteristic
but not all P waves conduct to cause
of second-degree AV block Type II?
QRSs
Which rhythm is this?
Sinus rhythm with bundle branch block

Which rhythm is this?
1/2