ECG Made Easy 3 Flashcards
4 places where cardiac rhythm can begin?
SA Node
AV Node
Atrial Muscle
Ventricular Muscle
what looks weird in a ventricular rhythm?
wide QRS
T wave is abnormal
Supraventricular rhythm QRSs look
normal
AV node naturally depolarizes at how many beats/min?
50beats/min
escape rhythms
Ventricular focus naturally depolarizes at how many beats/min?
30 beats/min
escape rhythms
Atrial escape comes from?
atrial focus
Junctional Escape rhythm?
area around AV node controls rate
When do you see venticular escape?
in complete heart block
ventricular tachycardia needs to be how fast to be dx?
120/min
Carotid Sinus pressure only affects what?
supraventricular tachys
No ventricular arrythmias
ventricular tachycardia looks like? How fast?
abnormally wide, no T-waves
200/min
characteristic of LBBB in V6?
‘M’ and inverted T-wave
where is origin if QRS is wider than 160ms?
probably ventricular origin
how to tel from the QRS complex is the rhythm is atrial fibrillation with BBB?
QRS complex is very irregular
Wolfe-Parkinson-White syndrome is?
accessory bundle from atria to ventricle, no AV node to delay conduction
Wolfe-Parkinson-White syndrome bundle what side of heart usually?
left side of heart
what dies Wolfe-Parkinson-White syndrome ECG look like?
short P-R interval
QRS has early slurred ‘delta’ wave (pre-excitation)
significance of Wolfe-Parkinson-White syndrome?
can have re-entry circuit and get sustained tachycardia
Which leads looks at left lateral surface of heart?
I, aVL, VI
Which leads look at inferior heart?
II, II, aVF
which leads look at anterior of heart?
V1,V2,V3, V4
Where does the right coronary artery follow?
Anterior Atrioventricular Groove
what runs in posterior AV groove?
Circumflex - marginal branches
LAD gives off what branches?
diagonal branches
Why do you get ST-elevation?
due to a action potential difference in endo and epicardium. ST elevation is detecting the current going from endo»epi
what are Q waves?
What you get at the end of an infarct, a negative reflection due to the ‘electrical hole’ on the area of infarct
actional potential travels from where to where?
endo»epicardium
