Cardiology_ECG Flashcards by Kevin G | Brainscape

Q

P-wave

A

Atrial depolarization

atrial repolarization is masked by QRS complex

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Q

PR interval

A

Conduction delay through AV node

usually <200msec

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Q

QRS complex

A

Ventricular depolarization

normally <120msec

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Q

QT interval

A

Mechanical contraction of the ventricles

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Q

T wave

A

Ventricular repolarization

T-wave inversion may indicate recent MI

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Q

ST segment

A

Isoelectric, ventricles depolarized

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Q

U-wave: cause?

A

Caused by hypokalemia, bradycardia

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Q

Speed of conduction?

atria, ventricles, Purkinje fibers, AV node

A

Purkinje > atria > ventricles > AV node

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Q

Natural pacemakers of the heart?

A

SA > AV > bundle of His / Purkinje / ventricles

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