ECG: Arrhythmias Flashcards

1
Q

Risk factors for fibrillation

A

Ischemia Mitral stenosis Hyperthyroidism Alcoholic carbiomyopathy Digitalis toxicity Pulmonary Embolus Pericarditis

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2
Q

Normal Depolarization frequencies of the SA node, AV node, and Ventricle

A

SA: 60-100 AV: 40-60 Vent: 25-40

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3
Q

What does it mean if an extrasystolic or premature beat is undercompensated?

A

That the impulse was generated from a supraventricular location.

-If the following beat is compensated or overcompensated, then the location may be supraventricular or ventricular.

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4
Q

What is the difference between the QRS complex for impulses generated supraventricularly vs ventricularly?

A

Supraventricular beats have narrow QRS complexes

Ventricular have wider QRS complexes.

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5
Q

What are causes of Arrhythmia?

A

Hypoxia

Ischemia

Myocardial infection

Hyperthyroidism

Strong sympathetic stimulation

Drugs (digitalis)

Hypokalemia or other ion imbalances

Bradycardia

Hypertrophy or dilation of the heart

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6
Q

Where are Nomotropic arrhythmias generated? Heterotropic?

A

Nomotropic: generated in the SA node

Heterotropic: generated anywhere else

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