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Heart Rhythm Abnormalities > Dysrhythmias > Flashcards

Dysrhythmias Flashcards

1
Q

What is an electrocardiogram (ECG)?

A

An ECG is a graphic tracing of the electrical impulses produced in the heart

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2
Q

What is an ECG composed of?

A

P waves
PR interval
QRS complex
ST segment
T wave

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3
Q

What does the P wave represent?

A

Atrial contraction and relaxation

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4
Q

What is the duration of the P wave in seconds?

A

0.06 to 0.12 seconds

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5
Q

What does the PR interval represent?

A

Time period between atrial contraction and atrial relaxation

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6
Q

What is the duration of the PR interval?

A

0.12 to 0.20 seconds

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7
Q

What does the QRS complex represent?

A

Ventricular contraction

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8
Q

What is the duration of the QRS complex?

A

0.06 to 0.10 seconds (0.4 seconds wide/width)

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9
Q

What does the ST segment represent?

A

Time period between ventricular contraction and ventricular relaxation

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10
Q

What does the T wave represent?

A

Ventricular relaxation

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11
Q

What are the six most common dysrhythmias?

A

Atrial flutter
Atrial fibrillation (A-fib)
PVCs
Ventricular Tachycardia (V-tach)
Ventricular Fibrillation (V-fib)
Asystole

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12
Q

Which dysrhythmia is described as recurring, sawtooth-shaped waves that originate from a single ectopic focus in the atria?

A

Atrial Flutter

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13
Q

What do the flutter waves in atrial flutter represent?

A

Atrial contraction followed by atrial relaxation

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14
Q

What are the ECG characteristics of atrial flutter?

A

Atrial rate of 250-350 bpm
Ventricular rate of 150 bpm
Atrial and ventricular rhythms are normal
PR interval is variable and not measured
QRS complex is normal

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15
Q

What is the clinical significance of atrial flutter?

A

High ventricular rates and loss of atrial contraction decreases cardiac output

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16
Q

Patients with atrial flutter are at a greater risk of what complications?

A

Stroke
- Clots form as a result of blood pooling in the atria

17
Q

List the

A
  • Calcium channel blockers and beta blockers decrease heart contractions
  • Anticoagulants are used to prevent stroke
  • Antidysrhythmics prevent dysrhytmias

Heart Rhythm Abnormalities (1 decks)

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