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Flashcards in Arrhythmia Deck (20):
1

What is the most common cause of Sudden Cardiac death?

Ventricular Fibrillation

2

What is the most common cause of Stroke?

Atrial Fibrillation

3

What does the P-Wave represent?

Depolarization of the Atria

4

Those tisses with slower Action potentials are dependent upon what?

Calcium

5

How can Ventricular Hypertrophy be diagnosed on ECG?

Height of the R wave is markedly increased
T Wave reversal

6

What is the mechanism of the ECG abnormalities in Ventricular Hypertrophy

Increased muscle mass delays depolarization and repolarization

7

Is Bundle Branch Block always pathological?

Yes

8

What are the EKG features of Bundle Branch Block?

Wide QRS

9

What is the pathophysiology of Bundle Branch Block

Delayed activation of the ventricle since conduction tissue is blocked

10

What is the PR interval?

Conduction through the AV node

11

What is the RS interval

Polarization of the ventricles

12

What does the T wave represent?

Repolarization

13

What does the Q wave represent?

Septal depolarization

14

What are the 2 MAJOR MECHANISMS* of Cardiac ARRHYTHMIAS?

1.Altered Automaticity
2.Reentry

15

What is Enhanced Automaticity?

Occures when there is a depolarization outside the normal cycle

16

What phase of the action potential has been altered in Enhanced Automaticity?

Phase 4 and it is raised threshold potential

17

What are possible causes of Enhanced Automaticity?

1.Increases sympathetic tone
2.Decreased parasympathetic tone
3.CO2
4.Digitalis
5.Low oxygen
6.Decreased Potassium

18

What are some causes of reentry?

Ischemia
Valve disease
Cardiac Surgery
Electrolyte Imbalance

19

What are some of the possible Clinical effects of Reentry?

1.Premature Atrial Depolarization
2.Supraventricular Tachycardia
3.Ventricular Tachycardia
4.Arrythmia in

20

What must be present for reentry to occur?

1.A contiguous alternative pathway for the current to move along
2.Loop circuit
3.Loop circuit + Unidirectional Blocc
4.Different conduction (slower) velocity