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Flashcards in FN: Bradycardias Deck (15):
1

Causes

DIVISIONS
Drugs
Ischaemia
Vagal hypertonia
Infection
Sick sinus syndrome
Infiltration
O
Neuro
Septal defect
Surgery or catheterisations

2

Drugs

Antiarrhythmics (type 1a, amiodarone)
Beta-blockers
Calcium channel blockers (verapamil
Digoxin

3

Ischaemia/infarction

Inferior MI

4

Vagal hypertonia

Athletes
Vasovagal syndrome
Carotid sinus syndrome

5

Infection

Viral myocarditis
rhuematic fever
Infective endocarditis

6

Sick sinus syndrome

structual damage or fiboris of SAN, AVN or conducting tissue
PC: SVT alternating with either sinus brady ± arrest or SA/AV block

7

Infiltration

Restrictive/dilated cardiomyopathy
1. autoimmune
2. Sarcoid
3. haemochromatosis
4. amyloid
5. muscular dystrophy

8

O

hypOthyroidism
HypOkalaemia (or hyper)
HypOthermia

9

Neuro

Raised ICP

10

Septal defect

Primum ASD

11

Sick sinus syndrome Rx

Bradyarythmias: pace
Tachyarrythmias: amiodarone

12

Classification

Sinus brady
First dgeree heart block: PR >200ms
Secondar degree:
1. Wenkebach/mobitz I
2. Mobitz II

Complete heart block
1. Junctional:narrow QRS @ 50bpm
2. VentricularL broad QRS @ 40 bpm

13

Rx of Brady

If asymptomatic and rate >40:no Rx needed

14

Urgent Rx/rate

Treat underlying cause e.g. drugs, MI
2. Medical
--> atropine 0.6-1.2g (max 3g) IV
--> Isoprenaline IVI

3. Pacing: external

15

Elective RX and in which conditions

Permanent pacing:
1. Mobitz II
2. Complete AV block
3. sick sinus
4. AF
5. Drug resistant tachyarrhythmias

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