UCLA EKG PRACTICE EXAM 2025/2026 QUESTIONS WITH
ANSWERS GRADED A+
✔✔ST segment - ✔✔Duration: End of ventricular depolarization to start of repolarization
Normally isoelectric line
✔✔T wave - ✔✔Ventricular repolarization (return to resting state)
✔✔J point - ✔✔End of QRS meets ST segment
✔✔QT interval - ✔✔Normal interval: 0.45 (male), 0.46 (female)
Measures from beginning of ventricular repolarization to the end of ventricular
repolarization
Medications that prolong QT: Amiodarone, Sotalol
✔✔Default setting for monitoring leads - ✔✔Lead II: Useful for accurate detection of HR
because of its tall R wave; Displays P wave clearly
Lead V1: Useful to distinguish wide QRS complex to determine superventricular or
ventricular arrhythmia
✔✔Systematic approach to EKG interpretation - ✔✔1. Rhythm: Regular vs irregular
2. Rate: Atrial vs ventricular
3. Waves: Present? Consistent?
4. Intervals: Mark, measure, mark
5. 1:1 Conduction?
6. ST segment isoelectric
✔✔Heart Rate Measurement - ✔✔Method #1:
6 second strip → Count R waves
Ventricular rate, atrial rate (Waves x10 = rate)
Method #2: Caliper method
If RR intervals are REGULAR:
Count #small boxes between two R-R /1500
Method #3:
-I.D. an R wave that falls upon a DARK line (initial R wave)
-Label the DARK line "Start"
-Label the subsequent DARK lines: 300, 150, 100, 75, 60, 50...
-I.D. the next R wave to occur after the initial R wave (second R wave)
, ✔✔Age-specific HR ranges (adult) - ✔✔Awake HR: 60-100
RR: 12-18
✔✔Normal Sinus Rhythm (NSR) - ✔✔Rhythm: Regular
Rate: 60-100
P wave: Normally upright, smooth, round, before every QRS
Site of pacemaker: SA node
PR interval: Normal (0.12-0.2 sec)
QRS: Normal (0.04-0.12 sec)
QT: Normal (<0.46 sec)
Conduction: 1:1
Treatment: N/A
✔✔Sinus bradycardia - ✔✔Rhythm: Regular
Rate: <60
P wave: Sinus
One-to-One Conduction: Yes
PR interval: Normal (0.12 - 0.20 sec)
QRS: Normal (0.04-0.12 sec)
QT Interval: Normal (<0.46 sec)
Treatment: Atropine IVP
✔✔Sinus tachycardia - ✔✔Rhythm: Regular
Rate: 100-150
P wave: Sinus
One-to-one conduction: Yes
PR Interval: Normal (0.12-0.2 sec)
QRS: Normal (0.04-0.12 sec)
QT: May be <0.46 sec
Treatment: Treat the cause
ANSWERS GRADED A+
✔✔ST segment - ✔✔Duration: End of ventricular depolarization to start of repolarization
Normally isoelectric line
✔✔T wave - ✔✔Ventricular repolarization (return to resting state)
✔✔J point - ✔✔End of QRS meets ST segment
✔✔QT interval - ✔✔Normal interval: 0.45 (male), 0.46 (female)
Measures from beginning of ventricular repolarization to the end of ventricular
repolarization
Medications that prolong QT: Amiodarone, Sotalol
✔✔Default setting for monitoring leads - ✔✔Lead II: Useful for accurate detection of HR
because of its tall R wave; Displays P wave clearly
Lead V1: Useful to distinguish wide QRS complex to determine superventricular or
ventricular arrhythmia
✔✔Systematic approach to EKG interpretation - ✔✔1. Rhythm: Regular vs irregular
2. Rate: Atrial vs ventricular
3. Waves: Present? Consistent?
4. Intervals: Mark, measure, mark
5. 1:1 Conduction?
6. ST segment isoelectric
✔✔Heart Rate Measurement - ✔✔Method #1:
6 second strip → Count R waves
Ventricular rate, atrial rate (Waves x10 = rate)
Method #2: Caliper method
If RR intervals are REGULAR:
Count #small boxes between two R-R /1500
Method #3:
-I.D. an R wave that falls upon a DARK line (initial R wave)
-Label the DARK line "Start"
-Label the subsequent DARK lines: 300, 150, 100, 75, 60, 50...
-I.D. the next R wave to occur after the initial R wave (second R wave)
, ✔✔Age-specific HR ranges (adult) - ✔✔Awake HR: 60-100
RR: 12-18
✔✔Normal Sinus Rhythm (NSR) - ✔✔Rhythm: Regular
Rate: 60-100
P wave: Normally upright, smooth, round, before every QRS
Site of pacemaker: SA node
PR interval: Normal (0.12-0.2 sec)
QRS: Normal (0.04-0.12 sec)
QT: Normal (<0.46 sec)
Conduction: 1:1
Treatment: N/A
✔✔Sinus bradycardia - ✔✔Rhythm: Regular
Rate: <60
P wave: Sinus
One-to-One Conduction: Yes
PR interval: Normal (0.12 - 0.20 sec)
QRS: Normal (0.04-0.12 sec)
QT Interval: Normal (<0.46 sec)
Treatment: Atropine IVP
✔✔Sinus tachycardia - ✔✔Rhythm: Regular
Rate: 100-150
P wave: Sinus
One-to-one conduction: Yes
PR Interval: Normal (0.12-0.2 sec)
QRS: Normal (0.04-0.12 sec)
QT: May be <0.46 sec
Treatment: Treat the cause
