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The Patient - physiology (Y2-1) > ECG > Flashcards

Flashcards in ECG Deck (11)
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1

ECG allows clinicians to monitor how the wave of excitation moves through heart tissue. True or false?

True

2

How does an ECG work?

It detects very small differences in electrical potential at two points in the body due to movement of cellular depolarisation along the axis of measurement points

3

What does a P wave show?

Atrial depolarisation

4

What does the QRS complex show?

Ventricular contraction

5

What does a T wave show?

Ventricular repolarisation

6

How long is a normal PQ interval?

0.12-0.20 seconds

7

What may a PQ interval longer than 0.20 seconds indicate?

AV block

8

What may a PQ interval shorter than 0.12 seconds indicate?

WPW syndrome

9

How long is a normal QT interval?

<0.46 seconds

10

Why is a prolonged QT interval dangerous?

Because if a new depolarisation cycle arrives before cells are repolarised, there is a risk of ventricular fibrillation

11

ST elevation is important in the diagnosis of what conditions?

Ischaemia and myocardial infarctions (STEMI, NSTEMI)