ECG 2021 Tutorial 3: QT Interval and Abnormal Heart Rhythms

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What does the QT interval represent in an ECG?

The time for both ventricular depolarization and repolarization to occur.

List the components of a normal PQRST-complex in an ECG.

P-wave, PR-interval, QRS-complex, ST-segment, T-wave, QT-interval (QTc).

What are some clinical benefits of an ECG?

Valuable diagnostic tool for abnormal cardiac rhythms and other abnormalities.

Name the equipment needed for performing an ECG.

ECG machine, Recording paper, Electrodes, Conduction gel. Signup and view all the answers

How does ischemia differ from myocardial injury and infarction in terms of ECG findings?

Ischemia produces ST-segment depression, with or without T-wave inversion. Injury causes ST-segment elevation, with or without loss of R-wave voltage. Infarction causes deep Q-waves with loss of R-wave voltage. Signup and view all the answers

What type of abnormal heart rhythm can be elicited by medicines prolonging the QT interval?

Torsade de pointes. Signup and view all the answers

What is the purpose of an electrocardiogram (ECG)?

To record the electrical activity of the heart Signup and view all the answers

What are the components of a standard ECG?

P wave, QRS complex, T wave Signup and view all the answers

Why is the QT interval important in an ECG?

It represents the time taken for ventricular depolarization and repolarization Signup and view all the answers

What are the clinical benefits of using an ECG in healthcare?

Early detection of heart abnormalities, monitoring heart conditions, assessing the effects of medications on the heart Signup and view all the answers

What equipment is typically used to perform an electrocardiogram?

ECG machine, electrodes, leads Signup and view all the answers

How does an ECG help in identifying specific heart conditions?

By detecting abnormal patterns in the electrical activity of the heart Signup and view all the answers

What does the QRS complex represent in an ECG?

Rapid depolarisation of ventricle contractile fibers Signup and view all the answers

Explain the significance of the T-wave in an ECG.

It represents the repolarization of the ventricles, which is longer in duration than depolarization. Signup and view all the answers

What is the PR interval in an ECG and what does it represent?

The period of time between the onset of atrial depolarization (P wave) and onset of ventricular depolarization (QRS complex); 0.12 to 0.20 sec in duration. Signup and view all the answers

Describe the P-wave in an ECG.

Represents atrial depolarisation; a wave of depolarisation spreads from the SA node to the AV node. Signup and view all the answers

What does the ST-segment represent in an ECG?

Isoelectric period; period when both ventricles are depolarised. Signup and view all the answers

Explain the function of the PR-segment in an ECG.

Represents conduction of electrical signal from AV node to AV bundle; does not cause a contraction and is seen as a flat region on the ECG. Signup and view all the answers