3 - ECG Basics Flashcards
1
Q
Which ECG limb lead has neg qrs complex in normal subjects? 1 2 aVF aVR aVL
A
aVR
2
Q
Which chest leads are most aligned with overall position in chest cavity?
V1/2
V3/4
V5/6
A
V5/6
3
Q
Which chest leads have consistently positive qrs complexes?
septal (V1/2)
anterior (V3/4)
lateral (V5/6)
A
lateral (5/6)
4
Q
Where is the sinus node located?
A
RA near SVC
5
Q
What is a normal QRS axis?
A
-30 to 90 degrees in frontal plane
6
Q
inferior leads
A
2,3,aVF
7
Q
lateral limb leads
A
1, aVL
8
Q
septal leads
A
V1/2
9
Q
anterior leads
A
V3/4
10
Q
lateral precordial leads
A
V5/6
11
Q
how is the QRS axis computed?
A
sum of vectors for leads 1 and aVF
12
Q
What is a common cause of a left axis deviation?
A
LV hypertrophy
13
Q
What is a cause of right axis deviation?
A
pericardial effusion
14
Q
What signals a left deviation on an ECG?
A
inverted aVF
