Conduction blocks Flashcards by Edmund Whelan

Q

What length of PR interval would you see in first degree heart block?

A

> 200ms

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Q

What type of heart block is this?

A

1st degree

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Q

What type of heart block is this?

A

2nd degree: Mobitz I
(Progressively increasing PR intervals leading to skipped beat)

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Q

What type of heart block is this?

A

2nd degree: Mobitz II
(PR interval constant, missed regular beat)

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Q

What type of heart block is this?

A

3rd degree

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Q

What part of the conduction system of the heart is affected in first degree heart block?

A

SA –> AV node

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Q

What part of the conduction system of the heart is affected in second degree heart block?

A

AV node
(some impulses get from atria to ventricles)

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Q

What causes third degree heart block?

A

Complete loss of conduction between atria and ventricles.
(ventricles beat independently using escape beat)

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Q

Which type of heart block do you get progressively increasing PR intervals?

A

2nd degree - Mobitz I

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Q

Which type of heart block do you get consistent PR intervals but dropped QRS complexes?

A

2nd degree - Mobitz II

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Q

Which type of heart block do you get consistent PR intervals but dropped QRS complexes?

A

2nd degree - Mobitz II

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Q

What is first line treatment for third degree heart block where just the His bundle is affected?

A

Atropine

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Q

What’s second line treatment for third degree heart block where the bundle of His is affected?

A

Pacemaker

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Q

What’s the 1st line treatment for third degree heart block where both the bundle of His and purkinje fibres are affected?

A

Permanent pacemaker

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Q

What’s the 1st line treatment for third degree heart block where both the bundle of His and purkinje fibres are affected?

A

Permanent pacemaker

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Q

What’s the treatment for first and second degree heart block?

A

Monitoring + potential pacemaker

Q

what’s the mnemonic for remembering the LBBB and RBBB ECG appearances? Which leads do they both correspond to.

A

Q

blockage of the posterior fascicle of the left bundle results in what?

A

Q

blockage of the anterior fascicle of the left bundle results in what?

A

Q

how are LBBB treated?

A

Q

what’s the diagnostic criteria for the QRS complex for both RBBB and LBBB?

A

Q

what are the three diagnostic criteria for RBBB?

A

Q

what are the four diagnostic criteria for LBBB?

A