Summary EKG notes pt 2

6) Pacemaker Rhythms
how Pacemaker is attached: Atrial Pacemaker :
o
attached to right atria

Spike
·
occurs wip-wave




Notes: Ventricular Pacemaker :
·

Spike indicates Pacemaker
·
inserted into
right ventricle

·
Permanent are implanted to treat
·
impulse vent depolarization
.




patients W/ Symptomatic bradycardia Spike is at beginning of QRS

or complete heart block
·
Pacemakers now have an implantable
Cardioverter defibrillator (ICD) in

them to treat tachydysrhythmias
Artificial Pacemaker rhythm:




AV Sequential pacemaker "dual Chamber" :

Battery failure leads in both right
·
: atria and ventricle

·
·
Spikes decrease in amplitude Spike at p-wave and QRS

·
rate slows down
·
dire emergency

Runaway Pacemaker :

·
Pacemaker begins shorting


Failure to capture :

Undersensing: leads
·
become displaced ,
not in contact w/ muscle


"Spikes but aren't always followed
·

Sensing device fails natural/implant
,
occur
by QRS

Pacemaker may compete

, Notes:
7) Heart Blocks
First degree heart block :
·
blockade in ·
most
electrical
pathway common ,
results from an extensive


delay of the AV node
o
PR interval is than
longer normal

·
can be caused betalcalcium blockers
by or



aligoxin




Second degree (mobitz 1) :
attempt to fire QRS fails
·
,




·
two total p-waves
·
atrial rate : reg/ventricular : irregular




Second degree (mobitz III. :
·
indicates an increased risk for
third degree
·
three total p-waves
·
atrial rhythm is
regular


Third degree (completel:
·
Atria and ventricles are independent
of one another

lethal dysrhythmia
·
lead to
may ,




asystole
·
PR intervals are variable