PHTH 524 > ECG > Flashcards

ECG Flashcards

(42 cards)

Study These Flashcards
1
Q

Intrinsic rate of the SA node

A

60-100 bpm

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2
Q

intrinsic rate of AV node

A

40-60 bpm

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3
Q

intrinsic rate of ventricles

A

25-40 bpm

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4
Q

What does the P wave represent

A

depolarization of both atria

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5
Q

What does the P-R interval represent

A

The electrical transmission from the atria to the ventricles

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6
Q

What does the QRS complex represent

A

ventricular depolarization

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7
Q

what does the S-T segment represent

A

early repolarization

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8
Q

What does the T wave represent

A

repolarization of the ventricles

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9
Q

3 methods to calculate HR

A
  1. 1500 method
  2. Cardiac ruler
  3. 6-second method
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10
Q

What is the 1500 method

A
  • Calculate R-R interval

HR = 1500/# of squares

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11
Q

What is the cardiac ruler method

A
  • each 5 mm block = 300
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12
Q

What is the 6-second method

A
  • 6 seconds on strip is 30 5mm boxes
  • Count number of RR intervals during 6-seconds
  • Multiply by 10
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13
Q

what is sinus bradycardia

A

HR < 60 bpm

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14
Q

what is tachycardia

A

HR > 100 bpm

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15
Q

The more leads an ECG has, the more….

A

accurate

the more snapshots of the heart

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16
Q

What are the 6 steps to interpretation of 3 or 5 lead ECG

A
  1. calculate rate
  2. calculate rhythm
  3. examine the relationship between the P wave and the QRS complex
  4. Examine the PR interval
  5. Check for terrible triad of ischemia, injury, and infarction
  6. What are the hemodynamic consequences of this rhythm
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17
Q

How do you examine atrial rhythm

Study These Flashcards
A

P-P intervals using pencil + paper

18
Q

how do you examine atrial rhythm

Study These Flashcards
A

R-R intervals using pencil + paper

19
Q

What is a slightly irregular rhythm? Makedly?

Study These Flashcards
A

< or equal to 0.04s

>0.04

20
Q

What is the amplitude and duration of a normal p wave

Study These Flashcards
A

amp: 2-3 mm high
duration: 0.06-0.12 s

21
Q

What is the amplitude and duration of a QRS complex

Study These Flashcards
A
  • Amp: 5-30 mm

- Duration: 0.04-.11 s

22
Q

Normal duration of PR interval

Study These Flashcards
A

0.12-0.20 seconds

23
Q

What does a peaked or enlarged P-wave indicate

Study These Flashcards
A

atrial hypertrophy or enlargement associated with COPD, pulmonary emboli, vascular disease or heart failure

24
Q

What does an inverted P wave indicate

Study These Flashcards
A

reverse conduction from atriaventricular junction toward atria

25
What do varying p waves indicate
impulse may be coming from different sites, wandering pacemaker, damage near SA node
26
What does an absent P-wave indicate
conduction route other than SA node - atrial fibrillation
27
What do no p waves indicate
complete heart block
28
What does a deep/wide QRS complex indicate
myocardial infarction
29
what does an absent QRS complex indicate
atrioventricular block
30
What does a prolonged PR interval mean
conduction delay from meds or heart block
31
What does a shortened PR interval indicate
impulse originated from somewhere other than SA node
32
What are the 3 signs of a terrible triad
- inverted T waves - Elevated or depressed ST segment - Q-waves - usually negative deflection
33
what does an inverted T wave mean
- myocardial ischemia
34
What does an elevated or depressed ST segment indicate
myocardial injury
35
What does a Q-wave longer than 0.04s indicated
myocardial infarction or myocardial necrosis
36
What are the steps to the development of an acute MI
- ST elevation - T wave inversion - Start of a Q wave - Normalization of the ST segment
37
What does the diagnoses of MI depend on
- Chest discomfort and symptoms (nausea, fatigue, SOB) | - ECG abnormality
38
In what populations is it important to be aware of a premature ventricular contraction
acute MI & post-op cardiac patient populations
39
What is an premature ventricular contraction? How does it appear on an ECG
An early beat originating in the ventricles characterized by a premature, wide QRS complex, no associated P wave (typically), ST segment/T wave that slope opposite main QRS complex, followed by a pause
40
What in the consequence of a premature ventricular contraction
More than 6-minute, runs in 3 or more, needs medical attention
41
What is the treatment for premature ventricular contraction
antiarrhythmic medication
42
What are 5 questions/steps to determine your action
1. know the MD assessment and recommendations/referral parameters 2. Do they have accompanying objective symptoms 3. What are the protocold where you are working 4. What are the code blue protocols where you are working 5. When in doubt notify RN/MS ASAP
PHTH 524
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