Flashcards in Exam 3 Deck (14):
1
pre-excitation syndromes
- electrical current conducted from atria to ventricles more quickly than normal
- bypass AV node
- mainly males
- predisposes pt to tachyarrhythmias
2
what is the bypass pathway in wolff-parkinson- white
- bundle of kent
- can be either L or R sided
3
WPW syndrome
- premature ventricular depol
- shortened PR interval
- delta wave
- wide QRS
- many also experience at least one arrhythmia
4
what pre-excitation syndrome looks similar to v tach?
- WPW and SVT
- reentrant mechanisms goes up AV node and down bundle of kent
5
clinical manifestations of WPW
- mostly asymptomatic
- palpitations
- lightheaded
- syncope or presyncope
- chest pain
- sudden cardiac death- usually with a fib which degrades to v fib
6
pacemaker
- alternate power source controlled by microchip
- connected to electrodes
- placed subcutaneously
7
demand pacemaker
- fires only when intrinsic HR falls below threshold level
8
possible indications for pacemaker
- 3rd degree heart block
- Mobitz II
- symptomatic brady
- pauses > 3sec
- sick sinus rhythm
- afib with RVR
- conduction disorders in MI
- recurrent tacharrhythmias
9
what are the types of pacemakers?
- single chamber atrial
- single chamber ventricular
- dual chamber
- single lead atrial sensing ventricular
10
single chamber atrial pacemaker
- indicated for sinus node dysfunction
- no suspected AV block
- maintains AV synchrony
- simulates a sinus node
11
single chamber ventricular pacemaker
- AV block
- chronic a fib
- other atrial tachyarrhythmias
- rate response available
12
dual chamber pacemakers
- indicated for AV block
- provides AV synchrony
- rate response available
13
single-lead atrial-sensing ventricular pacemaker
- indicated for AV block
- desire to limit number of pacemaker leads
- good option for normal sinus node
14