Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Cardiorespiratory > Electrocardiography Revisited > Flashcards

Electrocardiography Revisited Flashcards

1
Q

What is the clinical relevance of the ECG?

A

can identify conduction abnormalities, structural abnormalities and perfusion abnormalities

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Advantages to the ECG

A

relatively cheap
reproducible between people and centres
quick turnaround on results/report

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Downward deflections are towards which electrode?

A

anode (-)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Upward deflections are towards which electrode?

A

cathode (+)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

An isoelectric line represents what?

A

no net change in voltage (i.e. vectors are perpendicular to the lead)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Steepness of line denotes the (?) of an action potential.

A

velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Width of the deflection denotes the (?) of the event.

A

duration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What does the P wave represent?

A

electrical signal that stimulates the contraction of the atria (systole)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What does the QRS complex represent?

A

electrical contraction that stimulates the contraction of the ventricles (systole)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does the T wave represent?

A

signifies relaxation of the ventricles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

SAN is made up of what type of cells?

A

autorhythmic myocytes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

SAN stimulates what?

A

atrial systole

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The PQ segment signifies?

A

AVN depolarisation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Q wave represents?

A

septal depolarisation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

R and S wave represent?

A

R - ventricular depolarisation

S - late ventricular depolarisation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

ST segment represents?

A

fully depolarised

17
Q

T wave represents?

A

ventricular depolarisation

18
Q

Lead I includes what limbs?

A

left arm to right arm

19
Q

Lead II includes what limbs?

A

left leg to right arm

20
Q

Lead III includes what limbs?

A

left leg to left arm

21
Q

What is the rule of electrode reading?

A

left to right, top to bottom, first electrode of each pair is the anode (-ve)

22
Q

V1 is placed where?

A

right sternal border

4th intercostal space

23
Q

V2 is placed where?

A

left sternal border

4th intercostal space

24
Q

V3 is placed where?

A

halfway between V1 and V2

25
Q

V4 is placed where?

A

mid clavicular space

5th intercostal space

26
Q

V5 is placed where?

A

anterior axillary line

at the level of V4

27
Q

V6 is placed where?

A

mid axillary line

at the level of V4

28
Q

What view of the heart?

A

ECG REVISITED LECTURE 1 TIMESTAMP 14.04

29
Q

Most commonly used lead is?

A

II

30
Q

How to calculate heart rate from ECG?

A

60/R-R interval = bpm

31
Q

List the augmented limb leads.

A

aVF
aVL
aVR

32
Q

The augmented limb leads use which electrodes?

A

fixed cathodes

virtual anodes

33
Q

What is the angle between an augmented lead and the limb lead that has it’s virtual anode?

A

90 degrees

34
Q

Which limb leads and augmented leads are perpendicular to each other?

A

aVR - Lead III
aVL - Lead II
aVF - Lead I

35
Q

How to calculate axis with aVL and lead II?

A 
find net deflection in both leads on ECG
opposite side is Lead II
adjacent side is aVL 
90 degree angle use tan (x)
find x 
report axis relative to zero 
zero to lead II is 60
0-x gives us axis
36
Q

Reference for zero is?

A

looking at the heart from the same viewpoint as lead I

37
Q

What other things to check when doing ECG?

A

Is it correct recording?
Review signal quality and leads
Verify voltage and paper speed
Review patient background if available

38
Q

ECG reporting procedure

A 
rate and rhythm
P wave and PR interval
QRS duration
QRS axis (-30 to +90)
ST segment 
QT interval
T wave
39
Q

QRS axis can be varied (within normal -30 to +90) for what reasons?

A

tall, thinner person tilts more +ve

shorter, stockier person tilts more -ve

Cardiorespiratory (20 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions