ECG Basics (lec 2) Flashcards Preview

Q3 ECG test 1 > ECG Basics (lec 2) > Flashcards

Flashcards in ECG Basics (lec 2) Deck (29)
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1
Q

Small square shows?

A

0.04 sec and 0.1 mV

2
Q

5 small squares?

A

= one large box

0.20 sec

3
Q

Horizontal measurements determine?

A

heart rate

4
Q

Isoelectric Line is?

A

flat line
no or very weak activity
use as baseline for Δ in electrical movement

5
Q

P Wave produced by?

Duration?

A

initiation of SA node impulse,
depol of R and L atria,
impulse thru AV jxn

0.06 - 0.10 sec

6
Q

PR Interval?

Duration?

A

start of P to start of QRS

0.12 - 0.20 sec

7
Q

PR Segment?

A

flat line b/w end of P wave and start of QRS complex

8
Q

QRS Complex?

Duration?

A

follows PR segment
Q = 1st neg deflection post PR seg
R = 1st + defl post Q or PR seg
S = 1st neg defl below baseline, post R

0.06 - 0.11 sec

9
Q

ST Segment?

A

flat line post QRS complex

10
Q

T Wave?

A

larger, asym wave post ST seg

11
Q

J-Point?

A

where QRS complex meets ST seg

12
Q

QT Interval from where to where?

Represents what?

Duration?

A

distance from onset of QRS Complex to end of T Wave

time of vent depol/repol

0.36 - 0.44 sec

13
Q

Typical ECG rhythm?

A

slide 12

14
Q

Artifact is?

A

marking not produced by heart

e.g. pt moves

15
Q

Bipolar Leads record?

Which leads are bipolar?

A

difference in elect potential b/w electrodes

I, II, III

16
Q

Lead I?

A

Standard Limb Lead
R wrist -> L wrist
RA neg, LA +

17
Q

Lead II?

A

Standard Limb Lead
R wrist -> L ankle
RA neg, LL +

18
Q

Lead III?

A

Standard Limb Lead
L wrist -> L ankle
LA neg, LL +

19
Q

Unipolar Leads?

Which leads are unipolar?

A

use one + electrode and reference point in center of heart

Augmented limb leads, Precordial leads

20
Q

Augmented Limb Leads?

A

use same leads as limb but only one +,

other two are grounds

21
Q

aVR?

A

R wrist
RA +
views heart base (atria, great vessels)

22
Q

aVL?

A

L wrist
LA +
views lateral wall of LV

23
Q

aVF?

A

L ankle
LL +
views inferior wall of LV

24
Q

Chest Leads?

A

precordial (horizontal plane)

all +

25
Q

Chest Lead placement:

V1
V2
V3
V4
V5
V6
A

V1 = 4th ICS, R of sternum (RV)

V2 = 4th ICS, L of sternum (RV)

V3 = halfway b/w V2 and V4 (septum)

V4 = 5th ICS, MCL (septum)

V5 = anterior axillary line, same horizontal plane as V4

V6 = midaxillary line, same V4

26
Q

Precordial Leads view?

Include which leads?

A

view horizontal plane,
anterior and lateral views of heart

V1 - V6

27
Q

Modified Chest Leads provide?

A

continuous monitoring in ER, ICU, telemetry

28
Q

Modified Chest Leads placement?

A

same as V1 or V6

29
Q

Anterior Leads include?

Lateral Leads include?

Inferior Leads include?

A

V1-V4

I, aVL, V5-V6

II, III, aVF