Ventricular Arrhythmias and Heart Blocks Flashcards Preview

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Flashcards in Ventricular Arrhythmias and Heart Blocks Deck (18)
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1

3 or more consecutive ventricular premature beats (PVCs) usually caused by Purkinje fibers rather than SA node

Ventricular Tachycardia

2

V Tach description

Sustained or Unsustained, both associated w
**electrolyte abnormalities**

Frequent complication of acute MI and Dilated Cardiomyopathy

3

Polymorphic V Tach, in which QRS complex twists around the baseline.

Torsades de Pointes

Very serious: Harbinger for death, Ventricular Fibrillation
Treatment: IV Magnesium, Potassium, Defibrillation

4

"Continuously changing axis" on EKG

Torsades de Pointes

Very serious: Harbinger for death, Ventricular Fibrillation
Treatment: IV Magnesium, Potassium, Defibrillation

5

Causes of Torsades de Pointes

Spontaneous, HypOkalemia, HypOmagnesia

Drugs that prolong QT

6

Lack of effective pumping action. Sudden unconsciousness and death, most often early morning.

Ventricular Fibrillation

7

Bigeminy PVC

Occurs every other beat

8

Trigeminy PVC

Occurs every third beat

9

20-40 BPM, No P wave, wide QRS

Idioventricular Rhythm

10

Very fast ventricular rate that is dissociated from an underlying atrial rate.

No P-QRS association.

Ventricular Tachycardia

Sustained - lasts > 30s, intervention required
Nonsustained - run of 3 or more beats, < 30s

11

The appearance of all the beats match each other in each lead (same QRS configuration)
Can deteriorate to VF

Monomorphic V Tach

12

Beat to beat variations in morphology
Torsades de pointes- polymorphic VT in the context of prolonged QT interval
Think ischemia

Polymorphic V Tach

13

Very fast ventricular tachycardia
Can no longer tell QRS, T wave, ST segment
Beats are so fast they fuse into an almost straight sinosoidal pattern

Ventricular Flutter

14

Ventricular Flutter vs Torsades de Pointes

Flutter - REGULAR, AND a little faster

Torsades - IRREGULAR

15

Cardiac Chaos
Different areas of the ventricles firing all at their own pace with no coordination or organization
Main cause of Sudden Cardiac Death (SCD)
Preceded by Ventricular Tachycardia
Ultimately asystole occurs

Ventricular Fibrillation

16

V Fib treatment

Nonsynchronized defibrillation, biphasic 120-200 joules
Amiodarone for 24-48hours
Revascularization
ICD

17

Delay or interruption in the transmission of an impulse from the atria to the ventricles

AV Blocks

18

Key determining factor for AV blocks

PR Interval