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Flashcards in ECGs: Tachycardias Deck (30)
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1

what murmurs cause AF?

mitral stenosis
mitral regurgitation

2

irregularly irregular rhythm should immediately cause you to think

atrial fibrillation

3

pathology of atrial flutter?

AV nodal reentry circuit

4

why is there increased risk of stroke in AF?

disordered blood flow in the atrium causes it to pool and form a clot which can travel to the brain

5

what are the QRS complexes like in atrial flutter?

regular

6

ECG shows a long PR interval with no other abnormalities

1st degree heart block

7

ECG shows an increasing PR interval with each beat followed by a dropped beat

mobitz type 1

8

atria are fluttering at ___bpm in atrial flutter

300

9

what drug can be given to make atrial flutter more prominently seen on the ECG?

adenosine (adeno-SEEN)

10

a narrow QRS is less than ___ms

120

11

broad QRS complexes are generated from...

within the ventricle

conducted with aberrancy (not using the his-purkinje system)

12

a narrow complex rhythm

at or above the AV node

will be using the His-Purkinje system

13

commonest cause of SVT

AV nodal reentry tachycardia (AVNRT)

14

what happens in AVNRT

an ectopic beat signals around the atrium whilst telling the ventricle to beat

15

what does adenosine do?

blocks conduction through the AV node so stops the reentry circuit

16

Tx SVT

vagal manouevres
adenosine

17

difference between AVNRT and atrial flutter?

AVNRT: reentry circuit occurs in the AV node only

flutter: reentry circuit originates in the WHOLE atrium

18

where's the problem in AVRT?

an accessory pathway AFTER the normal pathway where the signal goes BACK to the AV node

19

adenosine works for AVRT T/F

T
blocks AV node firing so will prevent the signal coming back

20

how to tell if a lead is pointing negative or positive if it's hard to tell?

look for the sharpest point on the wave (eg sharp point at the bottom would be a negative lead)

21

if patient is clinically unstable and has a SVT what do you do?

defibrillate

22

delta waves indicate...

WPW syndrome

23

what does a delta wave look like and where is it?

QRS complex

1. a slurred upstroke on the QRS
2. short PR interval

24

there is no AV nodal delay in AVRT T or F

T
ventricles can't relax

25

AF + accessory pathway (eg WPW) =

VF

26

a p wave found within the QRS complex is found in what supraventricular rhythm?

junctional rhythm

27

if a p wave is found within the QRS complex what has happened?

impulse starts in AV node instead of SA node which causes a simultaneous impulse to both the atria and ventricles

28

2 main pathologies behind SVT?

1. AV node reentry eg atrial flutter
2. accessory pathways eg WPW

29

an ECG that is sinus rhythm but the p wave looks different time is an example of

supraventricular ectopic beats

30

how can you differentiate clinically between SVT and sinus tachycardia?

vagal manoeuvres
adenosine