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1. Cardiovascular > Arrhythmias > Flashcards

Arrhythmias Flashcards

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1
Q

Where does a Supraventricular Arrhythmia originate?

A

above the ventricle, i.e., SAN, atrial muscle, AV node or HIS origin

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2
Q

Where does a Ventricular Arrhythmia originate?

A

origin is in ventriclar muscle (common)

or fascicles of the conducting system (uncommon)

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3
Q

Name some types of SVT?

A 
Supraventricular tachycardia
Atrial Fibrillation
Atrial Flutter
Ectopic atrial tachycardia
Bradycardia
Sinus bradycardia
Sinus pauses
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4
Q

Name some types of VT?

A

Ventricular ectopics or Premature Ventricular Complexes (PVC)
Ventricular Tachycardia
Ventricular Fibrillation
Asystole

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5
Q

Name some AV node arrhythmias?

A

AVN re-entry tachycardia
AV reciprocating or AV re-entrant tachycardia
AV block - 1st, 2nd or 3rd

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6
Q

Outline the clinical causes of Arrhythmias?

A 
Abnormal anatomy
Autonomic nervous system (ANS)
hyperthyroidism
Metabolic
Inflammation
Drugs
Genetic
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7
Q

What abnormal anatomy may cause arrhythmias?

A

left ventricular hypertrophy
accessory pathways
congenital heart defect

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8
Q

What Autonomic nervous system changes may cause arrhythmias?

A

Sympathetic stimulation: stress, exercise, hyperthyroidism

Increased vagal tone causing bradycardia

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9
Q

What metabolic changes may cause arrhythmias?

A

Hypoxia: chronic pulmonary disease, pulmonary embolus
Ischaemic myocardium: acute MI, angina
Electrolyte imbalances: K+, Ca 2+, Mg2+

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10
Q

What inflammation may cause arrhythmias?

A

viral myocarditis

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11
Q

What drug effects may cause arrhythmias?

A

direct electrophysiologic effects or via ANS

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12
Q

What genetic defects may cause arrythmias?

A

mutations of genes encoding cardiac ion channels e.g. the congenital long QT syndrome

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13
Q

What are Ectopic Beats?

A

Beats or rhythms that originate in places other than the SA node

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14
Q

What may cause ectopic beats?

A

Altered automaticity e.g. ischaemia, catecholamines

Triggered activity, e.g. digoxin, long QT syndrome

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15
Q

What is re-entry?

A

requires more than one conduction pathway, with different speed of conduction (depolarization) and recovery of excitability (refractoriness)

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16
Q

What may cause re-entry?

A

accessory pathway tachycardia (Wolf Parkinson White syndrome)
scar from previous myocardial infarction or congenital heart disease
Conditions that depress conduction velocity or shorten refractory period promote functional block, e.g. ischaemia, drugs

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17
Q

Describe the mechanism of tachycardia?

A

The ectopic focus may cause single beats or a sustained run of beats, that if faster than sinus rhythm, take over the intrinsic rhythm.
Re-entry: triggered by an ectopic beat, resulting in a self perpetuating circuit.

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18
Q

What are the symptoms of Arrhythmias?

A 
Palpitations, “pounding heart”
Shortness of breath
Dizziness
Loss of consciousness; “Syncope”
Faintness: “presyncope”
Sudden cardiac death
Angina, heart failure
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19
Q

What is Wolf Parkinson White Syndrome?

A

pre-excitation on an ECG (wide QRS and short PR)

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20
Q

What are the investigations of Arrhythmias and why?

A

12 lead ECG (in tachycardia, during SR)
CXR
Echocardiogram – assess structural heart disease
Stress ECG
- Look for myocardial ischaemia, exercise related arrhythmias
24 hour ECG Holter monitoring – assess paroxysmal arrhythmias
Event recorder: (capture the arrhythmia)
Electrophysiological (EP) study
- Induce clinical arrhythmia to study mechanism and map arrhythmia

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21
Q

What can cause sinus bradycardia?

A

Physiological i.e., athlete
Drugs (B-Blocker)
Ischaemia: common in inferior STEMIs

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22
Q

How do you treat sinus bradycardia?

A

Atropine (if acute, e.g. acute MI)

If haemodynamic compromise: hypotension, CHF, angina, collapse

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23
Q

What can cause sinus tachycardia?

A

Physiological - Anxiety, fever, hypotension, anaemia

Inappropriate - drugs, etc

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24
Q

What is the treatment of sinus tachycardia?

A

Treat underlying cause

B-adrenergic blockers

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25
What is the signs and treatment for atrial ectopic beats?
Asymptomatic or palpitations B-adrenergic blockers may help Avoid stimulants (caffeine, cigarettes)
26
What is Regular Supraventricular Tachycardia due to?
AV nodal re-entrant tachycardia (AVNRT) AV reciprocating tachycardia / AV re-entrant tachycaria (via an accessory pathway) (AVRT) Ectopic atrial tachycardia (EAT)
27
What is the Acute management of SVT? | SVT: Supraventricular Tachycardia
- Increase vagal tone: valsalva, carotid massage - Slow conduction in the AVN - IV Adenosine - IV Verapamil
28
What is the chronic management of SVT?
- Avoid stimulants - Electrophysiologic study and Radiofrequency ablation (first line in young, symptomatic patients) - Beta blockers - Antiarrhythmic drugs
29
What is Radiofrequency Catheter Ablation?
Selective cautery of cardiac tissue to prevent tachycardia, targeting either an automatic focus or part of a re-entry circuit
30
What are the causes of heart block/AV conducting disease?
``` Ageing process Acute myocardial infarction Myocarditis Infiltrative disease Amyloid Drugs - B-adrenergic blockers - Calcium channel blockers Calcific aortic valve disease Post-aortic valve surgery Genetic: Lenegre’s disease, myotonic dystrophy ```
31
What are the ECG characteristics of 1st Degree AV block?
Conduction following each P wave but takes longer. | P-R interval longer than normal (> 0.2 sec)
32
What causes 2nd Degree AV block?
Intermittent block at the AVN (dropped beats)
33
Describe type 1 2nd Degree AV block?
Mobitz 1: -progressive lengthening of the PR interval, eventually resulting in a dropped beat. Usually vagal in origin
34
Describe type 2 2nd Degree AV block?
Mobitz 2: Pathological, may progress to complete heart block (3rd degree HB) Some AP fails to get through the AV node Usually 2:1, or 3:1, but may be variable Permanent pacemaker indicated
35
Describe type 3 AV block?
Complete block | No action potentials from the SA node/atria get through the A-V node
36
Describe the two types of Pacemakers?
Single chamber: paces the right atria or right ventricle only Dual chamber: paces the RA and RV
37
What causes Ventricular Ectopics?
- Structural causes: LVH, heart failure, myocarditis - Metabolic: Ischaemic heart disease, electrolytes - Beta-blockers, Ablation of focus
38
What are the causes of Ventricular Tachycardia?
``` Significant heart disease - Coronary artery disease - A previous myocardial infarction OR Rare causes: - Cardiomyopathy - Inherited/ Familial arrhythmia syndromes - Long QT, Brugada syndrome ```
39
What is the Acute treatment of VT?
Direct current cardioversion (DCCV) if unstable. | If stable: consider pharmacologic cardioversion with AAD
40
What is the chronic treatment of VT?
Correct ischemia if possible (revascularisation) Optimise CHF therapies. Implantable cardiovertor defbrillators (ICD) if life threatening. VT catheter ablation.
41
What are the ECG characteristics of VT?
o The QRS complexes are rapid, wide, and distorted. o The T waves are large with deflections opposite the QRS complexes. o The ventricular rhythm is usually regular. o P waves are usually not visible. o The PR interval is not measurable. o A-V dissociation may be present. o V-A conduction may or may not be present.
42
Describe Ventricular Fibrillation
Chaotic ventricular electrical activity which causes the heart to lose the ability to function as a pump
43
What are the 2 treatments of Ventricular Fibrillation?
Defibrillation | Cardiopulmonary resuscitation
44
What does a wide QRS tachycardia with history of CAD/HF indicate?
Ventricular Tachycardia
45
What is the treatments in the ventricles AND atrium and ventricle by ICDs? (Implantable cardioverter defibrillator)
VENTRICLE: VT prevention antitachycardia pacing (ATP) low-energy cardioversion defibrillation for ventricular tachyarrhythmias (VT/VF). ATRIUM AND VENTRICLE brady sensing and pacing for bradyarrhythmias.
46
What is Atrial Fibrillation?
the disorganized electrical activity of the atria resulting in an irregular heartbeat
47
What is the mechanism of AF?
Initiated by rapid electrical activity arising from arrhythmogenic foci located in the muscular sleeves of pulmonary veins The arrhythmia is maintained by multiple re-entrant wavelets. Reduced refractoriness and conduction slowing facilitate re-entry
48
What are the three types of AF?
Paroxysmal Persistent Permanent
49
Describe Paroxysmal AF?
Paroxysmal and lasting less than 48 hours | Often recurrent
50
Describe Persistant AF?
An episode of AF lasting greater than 48 hours, which can still be cardioverted to normal sinus rhythm Unlikely to spontaneously revert to normal sinus rhythm
51
Describe Permanent AF?
Inability of pharmacologic or non-pharmacologic methods to restore normal sinus rhythm
52
How can AF be stopped?
Pharmacologic cardioversion with anti-arrhythmic drugs (30% effective) Electrical Cardioversion (90% effective) Spontaneous reversion to sinus rhythm
53
What are the symptoms of AF?
``` Palpitations Pre-syncope (dizziness) Syncope Chest pain Dyspnea Sweatiness Fatigue ```
54
What does AF look like on an ECG?
``` Atrial Rate: > 300 bpm Rhythm:  Irregularly irregular Ventricular Rate:  Variable Absence of P waves Presence of ‘f’ waves ```
55
What is an F wave in an ECG?
irregular undulations of the base line in an electrocardiogram
56
What is the Management of AF?
Rhythm control to Maintain SR Rate control - accept AF but control ventricular rate Anti-coagulation for both approaches if high risk for thromboembolism
57
What is the pharmacological treatment of AF?
``` Rate control during AF- to slow down AVN conduction - Digoxin - Betablockers - Verapamil, diltiazem Rhythm Control during AF- Restoration of NSR - Pharmacologic cardioversion (anti-arrhythmic drugs e.g. amiodarone) - Direct Current Cardioversion (DCCV) Maintenance of NSR - Anti-arrhythmic drugs - Catheter ablation of atrial focus/ pulmonary veins - Surgery (Maze procedure) ```
58
What is Direct Current Cardioversion?
terminate the arrhythmia by the delivery of a dose of electrical current to the heart at a specific moment in the cardiac cycle
59
Name drugs from Class 1 - 4 of Anti-arrhythmic drugs?
``` Class 1: reducing Na channel current - Lignocaine, quinidine, flecainide, propafenone Class II: B-Adrenergic antagonists - Propranalol Class III: action potential prolongation - Amiodarone, sotalol - DRONEDARONE Class IV - Ca channel antagonists - Verapamil ```
60
Describe Atrial Flutter
Rapid and regular form of re-entrant atrial tachycardia. | It is usually paroxysmal, and it is sustained by a macro-reentry circuit located in the right atrial myocardium
61
What do patients with chronic atrial flutter have?
underlying heart disease?
62
What is the treatment for atrial flutter?
``` RF ablation (80-90% long term success) Pharmacologic therapy - Slow the ventricular rate - Restore sinus rhythm - Maintain sinus rhythm once converted Cardioversion Warfarin for prevention of thromboembolism ```

1. Cardiovascular (30 decks)

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