Normal ECG Part I and II

Question 1

what is each little square on the ECG?

Answer 1

.04 seconds or 1 mm

Question 2

what should the PR interval not exceed?

Answer 2

.2 seconds

Question 3

in what leads is the P wave upright?

Answer 3

1, 2, V4-V6, and AVF

Question 4

in what leads is everything inverted?

Answer 4

AVR

Question 5

what doest the P wave represent?

Answer 5

atrial depolarization

Question 6

narrow/ small Q waves are normal in what leads?

Answer 6

1, AVL, AVF, V5, and V6

Question 7

what might ST depression be caused from?

Answer 7

subendocardial injury or ischemia

Question 8

what might ST elevation be caused from?

Answer 8

subepicardial injury or ischemia

Question 9

in what leads is the T wave upright?

Answer 9

1,2, V3-V6

Question 10

what is the shape of the T wave?

Answer 10

slightly rounded and asymmetrical; height is not greater than 5 mm

Question 11

what does QT duration represent?

Answer 11

length of the ventricular systole

Question 12

what is associated with inverted T waves or tall upright T waves?

Answer 12

ischemic pattern

Question 13

what does hyperkalemia show up as on an ECG?

Answer 13

tall peaked T waves with a narrow base

Question 14

what are the precordial leads?

Answer 14

V1-V6 (they are the ones located on the anterior chest wall)

Question 15

what are the bipolar limb leads?

Answer 15

I, II, and III

Question 16

what is sinus rhythm evident by?

Answer 16

upright P waves

Question 17

for axis determination, what leads should you look at?

Answer 17

I and aVF

Question 18

what should you consider if there are prominent T waves?

Answer 18

you have to consider the clinical circumstances- if there are no cardiac symptoms and they are healthy, then the prominent T waves could be normal

Question 19

What does a notching of a P wave indicate?

Answer 19

P-mitrale; caused by mitral stenosis

Question 20

what does a point P wave indicate?

Answer 20

P-pulmonale; caused from underlying pulmonary disease

Question 21

what could a prolonged PR interval indicate?

Answer 21

an AV block

Question 22

what could a deeply inverted symmetrical T wave in V3 indicate?

Answer 22

infarction of anterior heart