DSA 1: Normal ECG Flashcards Preview

Year 1: 08. CPR Exam 1 COPY > DSA 1: Normal ECG > Flashcards

Flashcards in DSA 1: Normal ECG Deck (15)
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1
Q

What does the information on EKG represent?

A

Heart’s electrical activity

2
Q

What does the myocardium do when it is electrically stimulated?

A

Heart contracts

3
Q

During the resting state, is the interior of every myocyte is positive or negative?

A

Negative

4
Q

How is an influx of positive charges into a myocyte reflected on an EKG?

A

Upward deflection on EKG

5
Q

What is the dominant pacemaker in the heart?

Where is it located?

A

SA Node

-upper posterior wall of right atrium

6
Q

What does the P wave represent?

A

Atrial depolarization and contraction

7
Q

What is the role of the AV node?

A

Conduct depolarization stimulus through fibrous AV valves to ventricles

8
Q

Where does depolarization continue after AV node?

A

His bundles to right and left bundle branches

-rapidly conducting Purkinje fibers

9
Q

What does the QRS complex represent?

A

Depolarization of ventricle and initiation of ventricular contraction

10
Q

What does the T wave represent?

A

Ventricular repolarization

11
Q

On the EKG, what segments show ventricular systole?

A

QRS to end of T wave (QT interval)

12
Q

What is the role of free calcium inside myocytes?

A

Produces contraction

13
Q

What ion is responsible for repolarization in myocytes?

A

Potassium

14
Q

Why is conduction in the AV node slower compared to SA node?

A

Slow movement of calcium ions

15
Q

A standard EKG has ___ limb leads and ___ chest leads.

A

6 limb leads

6 chest leads