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Flashcards in Cardio - ECG Deck (65)
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1

What are ECGs great at telling us?

HR, arrhythmias, conduction abnormalities

2

What are ECGs good at telling us?

Chamber enlargement (specific but not sensitive)

3

What are ECGs bad at telling us?

Mechanical activity of the heart

4

What is an arrhythmia?

General term to describe electrical activity that has an irregular rhythm and/or an abnormal HR

5

What is an electrocardiogram?

ECG - graph of the electrical activity of the heart

6

How wide are the "small" boxes on an ECG strip?

1 mm

7

How wide are the "big" boxes on an ECG strip?

5 mm

8

What is the amplitude of an ECG strip?

10 mm/mV

9

What are the 2 common paper speeds for ECGs?

25 mm/sec and 50 mm/sec

10

What is the normal electrical activity of the heart?

  1. The SA node initiates normal electrical events ("pacemaker")
  2. Signals --> AV node that slowly conducts electricity to allow atria to contract and empty blood into ventricles before depolarizing the ventricles
  3. Signals --> L bundle branch/LV and R bundle branch/RV

11

Mechanical activity of the heart follows _____ _____.

electrical activity

12

What is highlighted and what occurs here?

P wave - atrial depolarization

13

What is highlighted and what occurs here?

PR (or PQ) interval - conduction slowly passes through AV node

14

What is highlighted and what occurs here?

QRS complex - ventricular depolarization

15

What is highlighted and what occurs here?

T wave - ventricular repolarization

16

What is A depicting?

Atrial depolarization (SA node)

17

What is B depicting?

Conduction of signals slowly through the AV node

18

What is C depicting?

Ventricular depolarization (L and R bundle branches to the respective chambers)

19

What is D depicting?

Ventricular repolarization

20

How is HR calculated on a 25 mm/sec strip?

# QRS in 15 big boxes (3 sec) x 20

21

How is HR calculated on a 50 mm/sec strip?

# QRS in 30 big boxes (3 seconds) x 20

22

What "trick" can be used to measure 3 seconds in a 50 mm/sec strip?

Use a BIC pen

23

What is the average HR here?

160 bpm

24

What is the average HR here?

80 bpm

25

What is the average HR here?

240 bpm

26

What are potential causes for bradyarrhythmia that can be seen on an ECG?

Sinus bradycardia, AV block, atrial standstill, sinus pause/arrest

27

What are some ECG findings that will still have a normal HR?

Normal sinus rhythm, 1st degree AV block, intermittent ventricular arrhythmia, intermittent supraventricular arrhythmia

28

What is a normal HR for dogs?

60-160 bpm

29

What is a normal HR for cats?

140-240 bpm

30

What is a normal HR for horses?

24-45 bpm

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