CCT Electrocardiography Procedures & Interpretation

Question 1

What does the P wave represent in an ECG?

Accepted Answer

Atrial depolarization

Answer

On an electrocardiogram (ECG), the P wave represents atrial depolarization, which is the electrical activation of the atria. This electrical impulse originates in the SA node and spreads across the atrial muscle, causing it to contract. This atrial contraction pushes blood into the ventricles, initiating the cardiac cycle.

Question 2

What is the normal duration of the PR interval?

Accepted Answer

0.12 to 0.20 seconds

Answer

The PR interval on an ECG measures the time from the beginning of atrial depolarization (P wave) to the beginning of ventricular depolarization (QRS complex). A normal PR interval typically ranges from 0.12 to 0.20 seconds. This interval reflects the time it takes for the electrical impulse to travel from the atria, through the AV node, and into the ventricles.

Question 3

Which lead configuration is most commonly used in continuous monitoring?

Accepted Answer

Lead II

Answer

Lead II is the most commonly utilized lead configuration for continuous cardiac monitoring due to its optimal view of the heart's electrical activity. It typically provides the clearest and largest P waves and QRS complexes, making it easier to identify and analyze cardiac rhythms and detect arrhythmias. This clarity is crucial for accurate real-time assessment of heart function and prompt intervention if needed.

Question 4

Which artifact can be caused by patient movement?

Accepted Answer

Somatic tremor

Answer

Somatic tremor, also known as muscle artifact, appears on an ECG as irregular, jagged spikes or a fuzzy baseline. It is directly caused by involuntary or voluntary muscle contractions from the patient, such as shivering, talking, or movement during the recording. To minimize this artifact and ensure a clear tracing, it is crucial to ensure the patient is warm, comfortable, and relaxed.

Question 5

Which part of the ECG corresponds to ventricular depolarization?

Accepted Answer

QRS complex

Answer

The QRS complex on an ECG represents ventricular depolarization, which is the electrical activation of the ventricles. This electrical event triggers the contraction of the ventricles, leading to the ejection of blood from the heart into the pulmonary artery and aorta. It is typically the largest and most prominent wave complex on the ECG due to the significant muscle mass of the ventricles.

(CCT) Certified Cardiac Technician Practice Test

(CCT) Certified Cardiac Technician Practice Test

CCT Electrocardiography Procedures & Interpretation