ECG

Question 1

Physiologically what occurs in heart during the P wave?

Answer 1

Atrial depolarization

Question 2

Physiologically what occurs during the heart in the QRS complex?

Answer 2

Ventricular depolarization

Question 3

Physiologically what occurs during the heart during the T wave?

Answer 3

Ventricular re-polarization

Question 4

What does an ECG NOT tell us?

Answer 4

Muscle contraction and how hard the heart is working.

Question 5

What is the isoelectric line? If the ECG persists along this line what does the patient have?

Answer 5

Baseline. Asystole.

Question 6

If something abnormal shows on the ECG, what should the nurse initially do?

Answer 6

Assess the patient as the ECG might change and show abnormal things with patient movement etc.

Question 7

What lead are we usually looking at?

Answer 7

Lead 2

Question 8

A rise from the baseline (isoelectric line) is what?

Answer 8

Positive deflection

Question 9

A fall from the baseline (isoelectric line) is what?

Answer 9

A negative deflection.

Question 10

An ECG will pick up on other ________ _____?

Answer 10

Muscle contractions.

Question 11

Normally impulses originate from which node?

Answer 11

Sinoatrial Node.

Question 12

What are the three main ions involved in an action potential?

Answer 12

Na, K, Ca

Question 13

How many electrodes are placed on the body for a 12 lead ECG?

Answer 13

10

Question 14

Lead 2 reads from where to where?

Answer 14

Right arm electrode to left foot electrode.

Question 15

What is the path electrical impulses take through the heart?

Answer 15

SA node - AV node - AV bundle/bundle of His - purkinje fibres

Question 16

What is a Q wave caused by?

Answer 16

Electrical activity moving across muscle fibres of the septum/depolarization through the septum.

Question 17

What does ST segment elevation indicate?

Answer 17

STEMI

Question 18

What does ST segment depression indicate?

Answer 18

NSTEMI

Question 19

What is the most common dysrhythmia requiring medical treatment?

Answer 19

AFib

Question 20

What occurs in AFib?

Answer 20

The SA node fails to coordinate atrial muscle contraction and impulses are initiated at different foci in the atria starts a muscle contraction.

Question 21

What is the atrial rate in AFib usually?

Answer 21

300-500

Question 22

In Afib what is the ventricular rate usually? Will this beat be regular or irregular? Why?

Answer 22

80-160. Irregular. Because only some impulses from the atria will get through to the ventricle.

Question 23

What medication is effective in treating a patient with AFib?

Answer 23

Digoxin

Question 24

In AFib there is no_____ wave.

Answer 24

P

Question 25

What is the resting electrical potential in the heart?

Answer 25

-90

Question 26

During an action potential what ions influx? Which ones efflux?

Answer 26

K. Na.

Question 27

What ion is involved with contractility of the heart?

Answer 27

Ca