#1
What does an EKG measure?
Electrical activity of the heart
ExplanationMeasures the electrical impulses in the heart.
#2
Which of the following is NOT a standard lead in a 12-lead EKG?
Lead D
ExplanationNot a standard lead, leads usually labeled I to V6.
#3
In lead aVR, the electrode is placed where?
Right arm
ExplanationRight arm electrode placement.
#4
What is the standard paper speed for recording an EKG?
50 mm/s
ExplanationStandard speed of EKG recording.
#5
What is the standard amplitude for recording an EKG?
1 mV
ExplanationStandard voltage for EKG recording.
#6
What is the normal duration of the PR interval in milliseconds?
0.06 - 0.10 ms
ExplanationNormal time taken for electrical impulses to travel from atria to ventricles.
#7
Which wave represents ventricular depolarization on an EKG?
QRS complex
ExplanationRepresents ventricular contraction.
#8
What does the T wave represent on an EKG?
Ventricular repolarization
ExplanationRepolarization of the ventricles.
#9
Which lead placement is commonly used to assess inferior myocardial infarction?
Lead III
ExplanationSpecific lead for monitoring the inferior wall.
#10
What does the QRS complex represent on an EKG?
Ventricular depolarization
ExplanationDepolarization of the ventricles.
#11
What is the correct sequence of waves in a normal sinus rhythm EKG?
P wave, QRS complex, T wave
ExplanationOrder of electrical activity in the heart.
#12
Which of the following conditions is associated with a prolonged QT interval?
Long QT syndrome
ExplanationCondition causing extended ventricular repolarization.
#13
What is the typical duration of the QRS complex in milliseconds?
0.20 - 0.40 ms
ExplanationNormal duration of ventricular depolarization.
#14
Which of the following EKG changes is characteristic of hyperkalemia?
Peaked T waves
ExplanationAbnormal T wave morphology.
#15
Which of the following conditions is associated with a shortened QT interval?
Short QT syndrome
ExplanationCondition causing shortened ventricular repolarization.