Cardiology Ch 6 Flashcards


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1

Ventricular dysrhythmia

A cardiac rhythm that is initiated from a pacemaker cell in the ventricles when other sites fail to initiate an electrical pulse.

-Life threatening

2

Premature ventricular complex

An individual complex that originates from an area below the bundle of his and occurs earlier than the next expected complex of the underlying rhythm.

- Common and can occur in any rhythm.

3

Unifocal PVCs

Originate from a single site within the ventricles and, produce monomorphic complexes

4

Multifocal PVCs

Originate from different ventricular sites and produce polymorphic complexes.

- More dangerous because they are the result of increased irritability within the ventricles.

5

Quadrigeminy of PVCs

Occurs when every fourth QRS complex is a PVC

6

Trigeminy of PVCs

Occurs when every third QRS complex is a PVC

7

Bigeminy of PVCs

Occurs when every other QRS complex is a PVC

8

Couplet

Describes two PVCs in a row that are not separated by a complex of the underlying rhythm.

9

Run of ventricular tachycardia

Occurs when three or more PVCs occur in a row, not separated by a QRS complex of the underlying rhythm.

10

R on T phenomenon

Additional term used to describe PVCs. Occurs when the R wave of the PVC falls on the T wave of the previous complex

11

Vulnerable period

The time during the cardiac cycle when the cardiac cells have repolarized to the point that some cells can be stimulated to depolarize again if the stimulus is strong enough

12

Ventricular tachycardia

A dysrhythmia that originates from a single sit in the ventricles at a rate of 101 to 250 electrical impulses per minute.

13

Torsades de pointes

-Twisting of the points, life threatening dysrhythmia, type of ventricular tachycardia that looks similar to VT. The rate is often 120-240 electrical impulses per minute.

14

V-Fib

Lethal dysrhythmia that originates from many different sites within the ventricles.

- Neither the ventricles or the atria depolarize.

15

Course V-Fib

Waves have a higher amplitude and are more irregular.

16

Fine V-Fib

Waves have less amplitude, indicating that fewer cardiac cells are able to respond to an electrical impulse

17

Idioventricular rhythms

Lethal dysrhythmias that usually originate from a single site in the ventricles

- final attempt of the cardiac conduction system to initiate an electrical impulse from the ventricular muscle.

- 40 electrical impulses per minute.

18

Ventricular standstill

Occurs when only atrial depolarization exists and there is no ventricular depolarization

- P waves are present and the p to p intervals are regular.

19

Asystole

Occurs when there is a complete lack of electrical activity in both the atria and the ventricles.

- lethal dysrhythmia and Patient will not have a pulse