#1
What does an EKG machine measure?
Blood pressure
Brain activity
Electrical activity of the heart
Respiratory rate
#2
Which of the following leads is commonly used for monitoring the heart's electrical activity?
Lead I
Lead II
Lead III
Lead IV
#3
In lead II of a standard 12-lead EKG, the positive electrode is placed on which part of the body?
Right arm
Left leg
Left arm
Right leg
#4
What is the standard paper speed for most EKG recordings?
25 mm/s
50 mm/s
100 mm/s
200 mm/s
#5
What is the purpose of the ground electrode in an EKG setup?
To measure heart rate
To provide a reference point for the EKG machine
To detect cardiac abnormalities
To control the paper speed
#6
What does the P wave represent in an EKG waveform?
Ventricular depolarization
Atrial repolarization
Atrial depolarization
Ventricular repolarization
#7
Which of the following conditions might cause a 'sawtooth' pattern on an EKG?
Atrial fibrillation
Ventricular tachycardia
Supraventricular tachycardia
First-degree heart block
#8
What is the normal duration of the PR interval on an EKG?
0.04 to 0.10 seconds
0.10 to 0.20 seconds
0.20 to 0.30 seconds
0.30 to 0.40 seconds
#9
Which EKG waveform represents ventricular repolarization?
T wave
QRS complex
P wave
U wave
#10
Which component of the EKG machine filters out noise and artifacts?
Amplifier
Electrode
Paper speed control
Notch filter
#11
What might cause 'artifact' in an EKG recording?
Patient movement
Loose electrode connection
Electrical interference
All of the above
#12
What might cause 'baseline wander' in an EKG recording?
Electrical interference
Loose electrode connection
Muscle tremor
Respiratory movement
#13
Which of the following arrhythmias is characterized by a lack of P waves and irregular, chaotic QRS complexes?
Atrial fibrillation
Ventricular fibrillation
Atrial flutter
Premature ventricular contractions
#14
Which of the following is a common method for troubleshooting EKG artifacts caused by patient movement?
Replacing the EKG machine
Administering a sedative to the patient
Ensuring proper skin preparation and electrode placement
Increasing the amplitude of the EKG signal
#15
Which EKG lead placement is typically used to detect myocardial infarction in the anterior wall of the heart?
Lead I
Lead II
Lead III
Lead V1-V4