Brainscape's Knowledge GenomeTM

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


See full index

MDT > Introduction to ECGs > Flashcards

Introduction to ECGs Flashcards

1
Q

what is the fireing rate of the SA node?

A

60-100 beats per minute

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

what is the conduction speed of the SA node?

A

2 meters/second

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

what is the conduction speed of the AV node?

A

0.05 meters/ second

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

what is the conduction speed of the bundle of his?

A

4 meters/ second

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

what is the conduction speed of the contractile muscle cells?

A

1 meter/ second

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

what is chronotropy?

A

the heart rate

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

what is dromotropy?

A

the conduction speed

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

what is Ionotropy?

A

the contractile strength

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

Absolute refractory period (ARP)

A

no new action potentials can be initiated regardless of the stimulus stength.

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

effective refractory period

A

includes the ARP plus a short segment of phase 3. a stimuli may cause cells to depolarize but not create an action potential

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

releative refractory period

A

a greater than normal stimuli will depolarize cells and cause an action potential leading to abnormal beats or arrythmias

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

supranormal period

A

a hyperexcitable period during which weaker than normal stimuli wil depolarize thee cells which could cause extra/premature beats

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

how many seconds does a small 1mm box represent?

A

0.04 seconds

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

how much seconds does a large box represent

A

0.2 seconds

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

how many milivolts does a small box respresent?

A

0.1 millivolts

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

what is the standard paper speed?

A

25mm per second aka 5 big boxs per second

17
Q

what is the normal time for the PR interval?

A

0.12-0.2 or 3-5 small boxes

18
Q

what does the PR interval represent?

A

the delay of conduction at the AV node

19
Q

why is there a delay of conduction at the AV node?

A

to allow for an atrial kick so 30% more blood canbe passed through to the ventricles

20
Q

how does the speed of the heart rate effect the PR interval?

A

a increased HR shortens the PR interval. a decrease in HR lengthens the PR interval

21
Q

what does the Q wave represent?

A

depolarization of the ventricular septum

22
Q

the depolarization of the ventricular septum moves in what direction

A

left to right, posterior to anterior

23
Q

what is the duration of a physiological or normal Q wave?

A

0.03 second

24
Q

what is the duration of a pathological Q wave?

A

longer than 0.03 seconds and has a 30% greater dip than R wave

25
Q

what does a pathological Q wave indicate?

A

a MI either from the past or ongoing

26
Q

what does the R wave represent?

A

ventricular depolarization and includes both the rise and decent on the ecg

27
Q

what does the s wave represent?

A

also depolarization of ventricles

28
Q

what is the normal duration of the QRS complex?

A

0.075 - 0.12 (less than 3 small boxes)

29
Q

what does a narrow QRS complex indicate? <0.12

A
  • fast ventricular depolarization and that the electrical impulse followed the correct conduction pathway
30
Q

what does a wide QRS indicate? >0.12

A

slow ventricular depolarization and that the electrical impulses had issues with the conduction pathway

31
Q

gender difference of the QRS complex

A

can be 0.005 to 0.008 (milliseconds) faster in women than in men

32
Q

what does the ST segment represent?

A

early repolarization of the ventricles

33
Q

what does the uwave represent?

A

late repolarization of the ventricles/purkinjie

34
Q

what plane does the standard limb leads and augmented limb leads view the heart?

A

the verticle plane

35
Q

whate plane does the precordial leads view the heart?

A

horizontal plane

36
Q

when placing the leads the should be _____cm away from the heart to avoid distortion

A

10cm

37
Q
A

MDT (20 decks)

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