ECG Made Easy 3

Question 1

4 places where cardiac rhythm can begin?

Answer 1

SA Node
AV Node
Atrial Muscle
Ventricular Muscle

Question 2

what looks weird in a ventricular rhythm?

Answer 2

wide QRS

T wave is abnormal

Question 3

Supraventricular rhythm QRSs look

Answer 3

normal

Question 4

AV node naturally depolarizes at how many beats/min?

Answer 4

50beats/min

escape rhythms

Question 5

Ventricular focus naturally depolarizes at how many beats/min?

Answer 5

30 beats/min

escape rhythms

Question 6

Atrial escape comes from?

Answer 6

atrial focus

Question 7

Junctional Escape rhythm?

Answer 7

area around AV node controls rate

Question 8

When do you see venticular escape?

Answer 8

in complete heart block

Question 9

ventricular tachycardia needs to be how fast to be dx?

Answer 9

120/min

Question 10

Carotid Sinus pressure only affects what?

Answer 10

supraventricular tachys

No ventricular arrythmias

Question 11

ventricular tachycardia looks like? How fast?

Answer 11

abnormally wide, no T-waves

200/min

Question 12

characteristic of LBBB in V6?

Answer 12

‘M’ and inverted T-wave

Question 13

where is origin if QRS is wider than 160ms?

Answer 13

probably ventricular origin

Question 14

how to tel from the QRS complex is the rhythm is atrial fibrillation with BBB?

Answer 14

QRS complex is very irregular

Question 15

Wolfe-Parkinson-White syndrome is?

Answer 15

accessory bundle from atria to ventricle, no AV node to delay conduction

Question 16

Wolfe-Parkinson-White syndrome bundle what side of heart usually?

Answer 16

left side of heart

Question 17

what dies Wolfe-Parkinson-White syndrome ECG look like?

Answer 17

short P-R interval

QRS has early slurred ‘delta’ wave (pre-excitation)

Question 18

significance of Wolfe-Parkinson-White syndrome?

Answer 18

can have re-entry circuit and get sustained tachycardia

Question 19

Which leads looks at left lateral surface of heart?

Answer 19

I, aVL, VI

Question 20

Which leads look at inferior heart?

Answer 20

II, II, aVF

Question 21

which leads look at anterior of heart?

Answer 21

V1,V2,V3, V4

Question 22

Where does the right coronary artery follow?

Answer 22

Anterior Atrioventricular Groove

Question 23

what runs in posterior AV groove?

Answer 23

Circumflex - marginal branches

Question 24

LAD gives off what branches?

Answer 24

diagonal branches

Question 25

Why do you get ST-elevation?

Answer 25

due to a action potential difference in endo and epicardium. ST elevation is detecting the current going from endo»epi

Question 26

what are Q waves?

Answer 26

What you get at the end of an infarct, a negative reflection due to the ‘electrical hole’ on the area of infarct

Question 27

actional potential travels from where to where?

Answer 27

endo»epicardium