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Flashcards in Rhythm Deck (49):
1

All automaticity foci pace with

A regular rhythm

2

Sinus arrhythmia represents normal, minimal variations in the SA nodes pacing rate in association with the phases of

Respiration

3

The atrial conduction system consists of 4 tracts

3 internodal right atrial tracts (anterior, middle, posterior) and one tract known as bachmanns bundle that innervates the left atrium

4

The slowed conduction through the AV node produces a

Pause on the EKG between the P wave and the QRS

5

The final phase of purkinje repolarization may record a small hump following the T wave on the EKG known as

A U wave

6

Irregular atrial rhythms are usually cause by

Multiple active atrial automaticity sites

7

Wandering pacemaker is from pacemaker activity wandering from the SA node to nearby atrial automaticity foci and causes

Irregular rhythm, p wave shape variations, atrial rate less than 100

8

Multifocal atrial tachycardia is a rhythm of patients with COPD and causes

Irregular rhythm, p wave shape variations, HR exceeds 100 bpm

9

Atrial fibrillation is caused by rapid firing of multiple atrial foci, and only an occasional random foci Rachel the AV node to be conducted to the ventricles is causes

Irregular rhythm, continuous chaotic atrial spikes, irregular ventricular rhythm

10

An automaticity focus that escapes overdrive suppression to pace at its inherent rate

Escape rhythm

11

An automaticity focus transiently escape overdrive suppression to emit one beat

Escape beat

12

When in sinus arrest an atrial focus quickly escapes overdrive suppression to become the dominant pacemaker at its inherent rate

Atrial escape rhythm

13

With absent regular pacing stimuli from above, an automaticity focus in the AV junction may escape overdrive suppression to become an active pacemaker

Junctions escape rhythm

14

A junctional automaticity focus may cause retrograde atrial depolarization causing

Retrograde p wave immediately before QRS, retrograde p wave after each QRS, retrograde p wave buried within each QRS

15

A ventricular automaticity focus is not regularly stimulated by paced depolarization from above causing

Ventricular escape rhythm

16

Pacing from a ventricular focus is often so slow that blood flow to the brain is significantly reduced causing unconsciousness. This is called

Stokes- Adams syndrome

17

One missed pacing cycle is known as a

Transient sinus block

18

A sinus block with an atrial automaticity focus is known as an

Atrial escape beat

19

A sinus block with a junctional automaticity focus is known as

A junctional escape beat

20

A sinus block with a ventricular automaticity focus is known as a

Ventricular escape beat

21

An irritable focus spontaneously fires a single stimulus known as

A premature beat

22

Ventricular automaticity are the worlds most sensitive sensors of...

Low O2

23

Atrial and junctional foci become irritable because ...

Epinephrine released by adrenal glands,
increased sympathetic stimulation, presence of caffeine, amphetamines, cocaine
Excess digitalis, some toxins occasionally etoh
Hyperthyroid
Stretch

24

An irritable atrial automaticity focus, producing a p wave earlier than expected

Premature atrial beat

25

If a premature atrial beat reaches the SA node it is depolarized as well the SA node will then...

Reset itself to a new rhythm with the PAB being the first beat of the new rhythm

26

An aberrant ventricular contraction is created sometimes with a PAB because ..

One of the ventricles is not completely repolarized and therefore temporarily unable to be depolarized causing a widened QRS

27

When the AV node is completely unreceptive to premature atrial depolarization causes

A nonconducted premature atrial beat

28

A premature atrial beat after every normal beat

Atrial bigeminy

29

A premature atrial beat after two normal cycles is

Atrial trigeminy

30

When an irritable automaticity focus in the AV junction suddenly fires a premature stimulus that depolarized the ventricles

Premature junctional beat

31

A ventricular focus can be made irritable by

Low O2
Low K
Pathology- mitral valve prolapse, stretch, myocarditis

32

An irritable ventricular automaticity focus that produces giant complexes on EKG

Premature ventricular contraction

33

The most likely reason for a ventricular automaticity focus to become irritable is

Under-oxygenation

34

How many PVCs per minute is considered pathological?

6

35

A ventricular automaticity focus that suffers from entrance block (is not irritable) so it paces at its inherent rate

Ventricular parasystole

36

A run of 3 or more PVCs in rapid succession is really a run of

Ventricular tachycardia

37

Each irritable focus produces its own

Distinctive looking PVC

38

What causes PVCs, including runs of VT and multifocal PVCs but is considered a benign condition

Mitral valve prolapse

39

Paroxysmal means

Sudden

40

Rapid rate with more than one p wave for every QRS

Paroxysmal atrial tachycardia with AV block

41

A continuous reentry circuit develops which includes the AV node and lower atria and rapidly paces the atria and ventricles

AV nodal reentry tachycardia

42

Paroxysmal Supra ventricular tachycardia

A very irritable automaticity focus that originates above the ventricles

43

A very irritable ventricular focus that suddenly paces in 150-250 bpm with a characteristic pattern of enormous, consecutive PVC like complexes

Paroxysmal ventricular tachycardia

44

The QRS in SVT even if widened by aberrant ventricular conduction is usually

0.14 sec or less

45

Ventricular complexes in VT are very wide

Greater than .14 sec

46

A single ventricular automaticity focus firing to produce smooth sine-waves or similar amplitude

Ventricular flutter

47

Multiple focus discharging rapidly

Fibrillation

48

An abnormal, accessory AV conduction which can short circuit the usual delay of ventricular conduction in the AV node

Bundle of Kent

49

The AV node is bypassed by an extension of the anterior internodal tract by passing the conduction delay by the James bundle in this syndrome

Lown-ganong- Levine syndrome