Free CCMA EKG Administration Questions and Answers 1 — Questions and Answers
Question 1: Where is the V4 electrode placed for a standard 12-lead EKG?
- 4th intercostal space, right sternal border
- 5th intercostal space, midclavicular line (Correct answer)
- 5th intercostal space, anterior axillary line
- 4th intercostal space, left sternal border
Correct answer: 5th intercostal space, midclavicular line
Proper lead placement is essential for an accurate EKG tracing. The V4 electrode is placed in the 5th intercostal space at the midclavicular line. This placement follows the placement of V2 and V3.
Question 2: What does the P wave on an EKG tracing represent?
- Ventricular depolarization
- Ventricular repolarization
- Atrial depolarization (Correct answer)
- Atrial repolarization
Correct answer: Atrial depolarization
The P wave represents the electrical activity associated with atrial depolarization, which is the contraction of the atria. The QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization.
Question 3: A wandering baseline artifact on an EKG is most likely caused by which of the following?
- Patient shivering or muscle tremors
- Poor electrode contact or patient movement (Correct answer)
- Interference from nearby electrical equipment
- Incorrect paper speed setting
Correct answer: Poor electrode contact or patient movement
A wandering baseline is a common artifact where the entire tracing drifts up and down. It is typically caused by poor electrode contact with the skin, which can be due to lotions, oils, or patient movement.
Question 4: What is the standard paper speed for an EKG machine?
- 10 mm/second
- 25 mm/second (Correct answer)
- 50 mm/second
- 100 mm/second
Correct answer: 25 mm/second
The standard paper speed for an EKG is 25 mm/second. This standardization allows for consistent interpretation of heart rate and intervals across different machines and settings. Changing this speed will compress or stretch the EKG complexes.
Question 5: Which instruction is most appropriate for a patient undergoing a routine EKG?
- Hold your breath for 30 seconds.
- Lie still and try not to talk or move. (Correct answer)
- Pump your fists to improve circulation.
- Take several deep, rapid breaths.
Correct answer: Lie still and try not to talk or move.
To obtain a clear EKG tracing free of artifacts, the patient must remain as still as possible. They should also be instructed to breathe normally, as holding their breath can alter the heart rate and rhythm.
Question 6: A key characteristic of atrial fibrillation on an EKG tracing is:
- A regular rhythm with a rate of 40 bpm
- A 'sawtooth' pattern of P waves
- An irregularly irregular rhythm with no clear P waves (Correct answer)
- A wide QRS complex with a regular rhythm
Correct answer: An irregularly irregular rhythm with no clear P waves
Atrial fibrillation (A-fib) is characterized by chaotic electrical activity in the atria, resulting in an absence of discernible P waves. This leads to an irregularly irregular rhythm, as the ventricles contract at random intervals.
Free CCMA EKG Administration Questions and Answers 1
Where is the V4 electrode placed for a standard 12-lead EKG?