Interpreting ECG: Heart Rate and Rhythm

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What does an ECG provide information on?

Respiratory rate and lung capacity of the heart

Blood pressure and oxygen saturation in the heart

Heart rate and rhythm, conduction velocity, and condition of tissues in the heart (correct)

Muscle strength and flexibility of the heart

How is the interpretation of an ECG initiated?

By analyzing the shape and duration of the QRS complex

By determining the number of atrial depolarizations

By addressing questions about heart rate, rhythm, and wave recognition (correct)

By identifying the location of the positive electrode

Which leads are used to determine the heart vector in the frontal plane?

Precordial (Chest) Leads

Limb Leads (correct)

Biopolar Leads

Unipolar leads

What is Einthoven's Triangle used for in relation to ECG?

To transport the standard limb leads into an equilateral triangle Signup and view all the answers

What does a vector represent during the cardiac cycle?

The direction of electrical activity seen by a lead Signup and view all the answers

What law states that Lead II is equal to the sum of potentials in leads I and III?

Einthoven's Law Signup and view all the answers

During depolarization, what kind of deflection is produced when the depolarization moves toward an active electrode in a volume conductor?

Positive deflection (R wave) Signup and view all the answers

"At each point along the electrical activity, a small charge separation exists in the extracellular fluid between polarized membranes (positive outside) and depolarized membranes (negative outside)". This statement is associated with which process?

Atrial depolarization and generation of P wave Signup and view all the answers

What is the ECG recording of?

Electrical fluctuations during depolarization and repolarization Signup and view all the answers

What do waves appear as in an ECG recording?

Deflections above or below the baseline Signup and view all the answers

What do segments represent in an ECG recording?

Sections of baseline between two waves Signup and view all the answers

Which part of the ECG represents the sum of electrical activity during depolarization and repolarization?

Waves Signup and view all the answers

What is the purpose of calculating the mean electrical axis of QRS complex?

To calculate the electrical axis of the heart Signup and view all the answers

What does the PR interval indicate in an ECG?

The time from the beginning of the P-wave to the beginning of the QRS complex Signup and view all the answers

What is the purpose of interpreting an ECG?

To assess heart rate and rhythm, conduction velocity, and tissue condition Signup and view all the answers

What does the QT interval indicate in an ECG?

The time from the QRS complex to the end of the T-wave Signup and view all the answers

What is not measured from the P-wave to the R-wave in an ECG?

PR interval Signup and view all the answers

What is generated by electrical activity, specifically depolarization or activation, of the muscle in an ECG?

P-wave Signup and view all the answers

What is made up of specialized cardiac muscle cells in an ECG?

SA node, AV node, bundle of His, and bundle branches Signup and view all the answers

What gets shorter as heart rate increases in an ECG?

QT segment Signup and view all the answers

What provides information on heart rate and rhythm, conduction velocity, and tissue condition in an ECG?

ECG interpretation Signup and view all the answers

What can be calculated by finding the distance between two QRS complexes in an ECG?

Heart rate per minute Signup and view all the answers

What does the QT segment indicate in an ECG recording?

The time from the beginning of the Q-wave to the end of the T-wave Signup and view all the answers

What is measured by finding the distance between two QRS complexes in an ECG recording?