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Cardiology > Heart Block > Flashcards

Heart Block Flashcards

1
Q

What are the main features of Heart Block?

A
  • syncope
  • heart failure
  • regular bradycardia (30-50 bpm)
  • wide pulse pressure
  • JVP: cannon waves in neck
  • variable intensity of S1
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2
Q

How many type of heart block are there?

A

Three

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3
Q

What is First degree heart block due to?

A

Delayed atrioventricular conduction through the AV node

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4
Q

What does every atrial impulse lead to in first degree heart block?

A

Ventricular contraction

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5
Q

What length will the PR interval be in someone with first degree heart block?

A

> 0.2 seconds

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6
Q

What is second degree heart block due to?

A

Some of the atrial impulses do not make it through the AV node to the ventricles.

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7
Q

How many types of second-degree heart block are there?

A

Two

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8
Q

What are the two types of second-degree heart block?

A

Mobitz I
Mobitz II

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9
Q

What is another term for Mobitz I?

A

Wenckebach phenomenon

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10
Q

What is Mobitz I?

A

Progressive prolongation of the PR interval until a dropped beat occurs

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11
Q

What is Mobitz I due to?

A

Atrial imputes becomes gradually weaker until it does not pass through the AV node.

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12
Q

What does Mobitz I result in?

A

Absent QRS complex after a P wave (no ventricular depolarisation)

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13
Q

What is Mobitz II?

A

PR interval is constant but the P wave is often not followed by a QRS complex

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14
Q

What is Mobitz II due to?

A

Intermitted failure or interruption of AV conduction.

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15
Q

What does Mobitz II result in?

A

This results in missing QRS complexes
PR interval is constant

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16
Q

What is there a set ratio of with Mobitz II?

A

A set ratio of P waves to QRS complexes
(e.g. 3 P waves to each QRS complex would be referred to as a 3:1 block)

17
Q

What is there a risk of with Mobitz II?

A

Asystole

18
Q

What is third degree heart block also known as?

A

Complete heart block

19
Q

What is the main characteristic of third degree heart block?

A

No association between the P waves and QRS complexes

20
Q

What is there a significant risk of with third degree heart block?

A

Asystole

Cardiology (66 decks)

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