Diagnostic Procedures and ECG Flashcards

Which of the following is the correct patient position for a standard resting 12-lead ECG?

Answer: Supine (lying flat) with arms at sides

The supine position with arms at sides minimizes muscle tension and artifact for an accurate resting ECG.

An AC interference artifact on an ECG appears as:

Answer: Regular thick fuzzy waves at 60 cycles per second

AC interference (60-cycle interference) appears as a regular thickening of the baseline caused by nearby electrical equipment.

In spirometry, FEV1 refers to:

Answer: Forced expiratory volume in 1 second

FEV1 is the volume of air forcibly exhaled in the first second of a forced expiratory maneuver and is a key indicator of airway obstruction.

Which of the following is the correct placement of the RA (right arm) electrode in a 12-lead ECG?

Answer: Right arm or right upper chest below the clavicle

The RA electrode is placed on the right arm or right upper chest just below the clavicle to record right arm limb lead signals.

What is the purpose of a stress test (exercise ECG)?

Answer: To evaluate cardiac response to physical exertion and detect ischemia

A stress test reveals cardiac ischemia or arrhythmias that may only appear when the heart's demand for oxygen increases during exercise.

The QRS complex on an ECG represents:

Answer: Ventricular depolarization

The QRS complex represents ventricular depolarization, which triggers ventricular contraction (systole).