Arrhythmias Flashcards

1
Q

Arrhythmias are diagnosed by?

A

ECG

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Normal resting Hr is ?

A

60-100

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are common complaints of arrhythmias?

A

palpitations, dizziness, lightheadedness, SOB, chest pain and fatigue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the sequence of normal sinus rhythm?

A
  1. SA node initiates electrical impluse
  2. impulse spreads through atria resulting in atrial contraction
  3. impulse goes to AV node and conduction is slowed
  4. impulse travels down to bundle of HIS and divides into bundle branch
  5. impulse spreads through ventricle via purkinje fiber
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is phase 0 of cardiac action potential?

A

rapid ventricular depolarization, influx of Na causing ventricular contraction (QRS wave)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is phase 1 of cardiac action potential?

A

Early repolarization; Na channels close

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is phase 2 of cardiac action potential?

A

Plateau: influx of Ca and efflux of K

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is phase 3 of cardiac action potential?

A

Rapid ventricular repolarization in response to efflux of K (T wave)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is phase 4 of cardiac action potential?

A

Resting membrane potential; atrial depolarization occurs (P wave)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

At what phase do Class Ia, Ib, Ic work at?

A

phase 0

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

At what phase do class III work at?

A

phase 3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Etiology of arrhythmias?

A

MI, infarction, electrolyte imbalances, elevated sympathetic states, drugs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Supraventricular arrhythmias example

A

sinus tachycardia, A. fib, atrial flutter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Ventricular arrhythmia example?

A

premature ventricular contractions, ventricular tachycardia, ventricular fibrillation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

When to worry when QT interval is?

A

> 500 msec

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what can increase risk of QT prolongation?

A

hypokalemia, hypomagnesemia

17
Q

Drugs that increase QT interval?

A

Class 1 antiarrhythmics, antibiotics, azole antifungals, antidepressants, antiemetics, antipsychotics, oncology agents, HIV agents

18
Q

Class I

A

Ia: disopyramide, quinidine, procainamide
Ib: lidocaine, mexiletine
Ic: flecainide, propafenone

19
Q

Class II

A

beta blockers

20
Q

Class III

A

dronedarone, dofetilide, sotalol, ibutilide, amiodarone

21
Q

Class IV

A

verapamil, diltiazem

22
Q

What is goal resting HR?

A

< 80 BPM

23
Q

Preferred for rate control?

A

BB and Non-DHP CCB

24
Q

What is rhythm control consist of?

A

methods for conversion to NSR and maintenance of NSR

25
Q

What drugs are used for rhythm control?

A

dofetilide, dronedarone, flecainide, propafenone, sotalol

26
Q

MOA of Ia antiarrhythmics?

A

block Na and K

27
Q

Which Ia have strong anticholinergic effects?

A

disopyramide and quinidine

28
Q

Norpace, norpace CR

A

disopyramide

29
Q

MOA of Ib antiarrhythmics?

A

pure sodium channel blockers

30
Q

Rythmol

A

propfenone

31
Q

Nexterone, pacerone

A

amiodarone

32
Q

Multaq

A

dronedarone

33
Q

Betapace, sotylize, sorine

A

sotalol

34
Q

Corvert

A

ibutilide

35
Q

Tikosyn

A

dofetilide

36
Q

Therapeutic range of digoxin for Afib ?

A

0.8-2