Icm Cardio: Thaler Ecg Chapter 1

Front 1

The standard leads are ___ (3)

They are oriented at ___ (3) degrees.

Back 1

I, II, III

0, 60, 120

Front 2

The augmented leads are ___ (3).

They are oriented at ___ (3) degrees.

Back 2

aVF, aVR, aVL

90, -150, -30

Front 3

The inferior leads are ___, ___ and ___.

Back 3

II, aVF, III

Front 4

The 2 kinds of limb leads are ___ and ___.

Back 4

standard
augmented

Front 5

The 2 kinds of leads are ___ and ___.

Back 5

limb
precordial

Front 6

The LIMB leads partition the ___ plane and the PRECORDIAL leads partition the ___ plane.

Back 6

frontal
horizontal

Front 7

Each augmented lead uses ___ as ground.

Back 7

the other 2 augmented leads

Front 8

V1 is placed at ___

Back 8

4th intercostal space, to the right of the sternum

Front 9

V2 is placed at ___

Back 9

4th intercostal space, to the left of the sternum

Front 10

V3 is placed at

Back 10

between V2 & V4

Front 11

V4 is placed at

Back 11

the 5th intercostal space, on the midclavicular line

Front 12

V5 is placed at

Back 12

between V4 & V6

Front 13

V6 is placed at

Back 13

the 5th intercostal space, on the midaxillary line

Front 14

The right ventricle is oriented ___, but the left ventricle is oriented ___.

Back 14

anteriorly & medially
posteriorly & laterally

Front 15

The anterior leads are ___.

Back 15

V1-V4

Front 16

The left lateral leads are ___.

Back 16

I, aVL, V5, V6

Front 17

The projection of the P wave vector onto the frontal plane is ___.
Its projection onto the axial plane is ___.

Back 17

to the left and slightly down
to the left and slightly anterior

Front 18

The P wave is seen in lead I as ___, in lead III as ___, and in lead aVR as ___.

Back 18

positive
biphasic
negative

Front 19

___ represents the time from the start of atrial depolarization to the start of ventricular depolaritzation.

Back 19

PR interval

Front 20

The PR interval normally lasts ___

Back 20

0.12 to 0.2 s

Front 21

The amplitude of the P wave is normally not above ___.

Back 21

0.25 mV

Front 22

The P wave amplitude is usually greatest in lead ___ and most negative in lead ___.

Back 22

II
aVR

Front 23

The physiologic Q wave represents ___ and has a ___ average direction.

Back 23

Interventricular septum depolarization
rightward, anterior

Front 24

The Q wave is usually visible in leads ___ (4).

Back 24

I, aVL, V5, V6

Front 25

R wave progression refers to the change in polarity of the ___ as you move from lead ___ to lead ___.

Back 25

QRS complex
V1
V6

Front 26

The S wave is most negative at lead ___ and the R wave most positive at lead ___.

Back 26

V1
V5

Front 27

The QRS complex normally lasts ___.

Back 27

0.06-0.12 s

Front 28

The ST segment represents ___.

Back 28

The time from the end of ventricular depolarization to the start of ventricular repolarization.

Front 29

The T wave represents ___.

Back 29

ventricular repolarization

Front 30

The leads with a large R wave will have a ___ T wave.

Back 30

positive

Front 31

The normal amplitude of a T wave is ___.

Back 31

1/3 to 2/3 the R wave amplitude

Front 32

The ___ measures the time from the beginning of ventricular depolarization to the end of ventricular repolarization.

Back 32

QT interval

Front 33

QT duration changes with changing ___.

Back 33

HR

Front 34

With standard settings, 1 unit on the X axis equals ___

Back 34

0.04 s

Front 35

With standard settings, 1 large square (5 units) on the X axis equals ___

Back 35

0.2 s

Front 36

With standard settings, 1 unit on the Y axis equals ___

Back 36

0.1 mV

Front 37

With standard settings, 1 large square (5 units) on the Y axis equals ___

Back 37

0.5 mV