Basics of Electrocardiography (ECG) Quiz

ECG stands for Electrocardiogram, a test that measures the electrical activity of the heart.

The Sinoatrial (SA) node generates electrical impulses, acting as the heart's natural pacemaker.

The P-wave represents atrial depolarization, indicating the electrical activity of the atria contracting.

Lead II is commonly used to obtain a 12-lead ECG, providing a specific view of the heart's electrical activity.

The T-wave represents ventricular repolarization, marking the electrical recovery of the ventricles.

The PR interval measures the time it takes for the electrical impulse to travel from the atria to the ventricles.

The normal duration range of the QRS complex is 0.06 to 0.10 seconds, indicating normal ventricular depolarization.

Lead aVR is considered the 'ground' lead in a standard 12-lead ECG, providing a reference point for electrical activity.

The QT interval represents the time it takes for the ventricles to repolarize, indicating their relaxation phase.

Hyperkalemia, or high levels of potassium, is the most common cause of a peaked T-wave in an ECG.

The ST segment represents the early phase of ventricular repolarization, indicating the beginning of relaxation.

The isoelectric line on an ECG represents the baseline with no electrical activity, indicating a resting state of the heart.

Hypomagnesemia, or low magnesium levels, may cause a prolonged QT interval on an ECG due to its effects on cardiac repolarization.

A negative deflection in lead II typically represents ventricular repolarization, indicating the relaxation phase of the ventricles.