UCLA EKG TEST STUDY GUIDE 2025/2026
ACCURATE QUESTIONS AND VERIFIED
CORRECT ANSWERS WITH RATIONALES
|| 100% GUARANTEED PASS
<RECENT VERSION>
Section 1: Basic EKG Principles & Measurements
1. What is the normal duration of a PR interval?
a) 0.06 - 0.12 seconds
b) 0.12 - 0.20 seconds
c) 0.20 - 0.30 seconds
d) < 0.06 seconds
Rationale: The PR interval represents the time from atrial depolarization to the
onset of ventricular depolarization. Normal conduction through the AV node
results in an interval of 0.12 to 0.20 seconds.
2. Which lead is primarily used to assess the inferior wall of the left ventricle?
a) V1
b) aVL
c) II, III, aVF
d) V5, V6
Rationale: Leads II, III, and aVF "look" at the inferior surface of the heart.
Changes here can indicate an inferior myocardial infarction (MI).
3. A prolonged QRS complex (>0.12 seconds) suggests which of the following?
a) Delayed conduction through the AV node
b) Delayed conduction through the atria
c) Delayed conduction through the ventricles
d) A rapid heart rate
Rationale: The QRS complex represents ventricular depolarization. A duration
, >0.12 seconds indicates a delay in intraventricular conduction, such as a bundle
branch block or a ventricular rhythm.
4. The QT interval should be corrected for heart rate. What is the name of this
corrected value?
a) QTc
b) QRSa
c) STb
d) PRx
Rationale: The QTc (Corrected QT Interval) is calculated using formulas like
Bazett's to account for the effect of heart rate on the QT interval. A prolonged QTc
is a risk factor for Torsades de Pointes.
5. Which part of the EKG tracing represents ventricular repolarization?
a) P wave
b) QRS complex
c) T wave
d) U wave
Rationale: The T wave is the manifestation of the ventricles resetting (repolarizing)
to prepare for the next beat.
Section 2: Sinus Rhythms & Dysrhythmias
6. What defines Normal Sinus Rhythm (NSR)?
a) A heart rate of 60-100 bpm, regular rhythm, normal P waves, and a PR interval
of 0.12-0.20 seconds
b) Any rhythm with a rate between 50-110 bpm
c) A rhythm originating from the AV junction
d) A rhythm with inverted P waves in lead II
Rationale: NSR is the standard, healthy rhythm with impulses originating correctly
from the sinoatrial (SA) node and following the normal conduction pathway.
7. A rhythm strip shows a regular rhythm, upright P waves in lead II, a PR
interval of 0.16 sec, and a rate of 52 bpm. This is:
a) Sinus Tachycardia
ACCURATE QUESTIONS AND VERIFIED
CORRECT ANSWERS WITH RATIONALES
|| 100% GUARANTEED PASS
<RECENT VERSION>
Section 1: Basic EKG Principles & Measurements
1. What is the normal duration of a PR interval?
a) 0.06 - 0.12 seconds
b) 0.12 - 0.20 seconds
c) 0.20 - 0.30 seconds
d) < 0.06 seconds
Rationale: The PR interval represents the time from atrial depolarization to the
onset of ventricular depolarization. Normal conduction through the AV node
results in an interval of 0.12 to 0.20 seconds.
2. Which lead is primarily used to assess the inferior wall of the left ventricle?
a) V1
b) aVL
c) II, III, aVF
d) V5, V6
Rationale: Leads II, III, and aVF "look" at the inferior surface of the heart.
Changes here can indicate an inferior myocardial infarction (MI).
3. A prolonged QRS complex (>0.12 seconds) suggests which of the following?
a) Delayed conduction through the AV node
b) Delayed conduction through the atria
c) Delayed conduction through the ventricles
d) A rapid heart rate
Rationale: The QRS complex represents ventricular depolarization. A duration
, >0.12 seconds indicates a delay in intraventricular conduction, such as a bundle
branch block or a ventricular rhythm.
4. The QT interval should be corrected for heart rate. What is the name of this
corrected value?
a) QTc
b) QRSa
c) STb
d) PRx
Rationale: The QTc (Corrected QT Interval) is calculated using formulas like
Bazett's to account for the effect of heart rate on the QT interval. A prolonged QTc
is a risk factor for Torsades de Pointes.
5. Which part of the EKG tracing represents ventricular repolarization?
a) P wave
b) QRS complex
c) T wave
d) U wave
Rationale: The T wave is the manifestation of the ventricles resetting (repolarizing)
to prepare for the next beat.
Section 2: Sinus Rhythms & Dysrhythmias
6. What defines Normal Sinus Rhythm (NSR)?
a) A heart rate of 60-100 bpm, regular rhythm, normal P waves, and a PR interval
of 0.12-0.20 seconds
b) Any rhythm with a rate between 50-110 bpm
c) A rhythm originating from the AV junction
d) A rhythm with inverted P waves in lead II
Rationale: NSR is the standard, healthy rhythm with impulses originating correctly
from the sinoatrial (SA) node and following the normal conduction pathway.
7. A rhythm strip shows a regular rhythm, upright P waves in lead II, a PR
interval of 0.16 sec, and a rate of 52 bpm. This is:
a) Sinus Tachycardia
