ECG Flashcards

1
Q

What does the ECG recording represent?

A

The movement of depolarisation through the heart.

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

What are the two ECG recording planes?

A

Transverse plane (axial, horizontal) and frontal plane (coronal).

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

Which leads are in the transverse plane?

A

Leads V1 - V6.

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

Which leads are in the frontal plane?

A

Leads I, II, III, aVR, aVL, aVF.

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

How many small squares are in one big square on the ECG paper?

A

Five small squares.

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

How many millivolts does one big square represent?

A

Five millivolts.

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

What is the calibration marker on the ECG paper for?

A

To show a 10 millivolt signal.

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

How many milliseconds are in one small square on the ECG paper?

A

40 milliseconds.

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

How many milliseconds are in one big square on the ECG paper?

A

200 milliseconds (0.2 seconds).

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

What is the paper speed of the ECG recording?

A

25 millimeters per second.

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

How do you calculate heart rate for a regular rhythm?

A

Count the squares between complexes and use the formula: 60 divided by the number of seconds the squares represent.

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

How do you calculate heart rate for an irregular rhythm?

A

Count the number of complexes in 30 large squares and multiply by 10.

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

What is the QRS axis?

A

The overall direction of the electrical signal in the frontal plane.

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

How do you find the most isoelectric QRS complex in the standard leads?

A

Look at leads I, II, III, aVF, aVR, and aVL, and find the lead with the most isoelectric QRS complex.

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

How do you calculate the mean frontal QRS axis?

A

The axis is 90 degrees from the most isoelectric QRS complex in the standard leads.

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

What is considered a “normal” QRS axis?

A

Between -30 and +120 degrees.

17
Q

What is sinus rhythm?

A

A normal cardiac rhythm with one P wave per QRS complex, and a resting rate of usually 60-90 bpm.

18
Q

What is tachycardia?

A

A fast heart rate.

19
Q

What is atrial fibrillation?

A

A cardiac rhythm with no discernible P waves and an irregular ventricular rate.

20
Q

What is supraventricular tachycardia?

A

A regular, narrow-complex tachycardia.

21
Q

What is ventricular tachycardia?

A

A regular, broad-complex tachycardia.

22
Q

What is bradycardia?

A

A slow heart rate.

23
Q

What are some causes of ST elevation on an ECG?

A

Myocardial infarction or pericarditis.

24
Q

What are some causes of ST depression or T wave inversion on an ECG?

A

Many causes, including ischemia, electrolyte abnormalities, and medications.