BAYCARE EKG TEST 2026/2027 | STUDY
GUIDE & PRACTICE QUESTIONS WITH
ANSWERS AND RATIONALES
BAYCARE EKG TEST 2026/2027 | STUDY GUIDE & PRACTICE QUESTIONS WITH
ANSWERS AND RATIONALES
OVERVIEW & STUDY FEATURES:
• Comprehensive Coverage: 200 meticulously organized questions spanning all
major EKG interpretation topics including normal findings, arrhythmias, ischemia,
infarction, blocks, hypertrophy, and electrolyte disturbances—ensuring complete
exam preparation.
• Study Strategy: Work through questions systematically by topic, review rationales
after each section, identify weak areas, and re-attempt incorrect questions; this
method reinforces pattern recognition essential for rapid clinical EKG
interpretation.
SECTION 1: NORMAL EKG INTERVALS AND MEASUREMENTS
QUESTION 1
The normal PR interval duration on a standard EKG is:
A) 0.08 to 0.10 seconds
B) 0.12 to 0.20 seconds
C) 0.16 to 0.24 seconds
D) 0.20 to 0.28 seconds
E) 0.24 to 0.32 seconds
CORRECT ANSWER: B) 0.12 to 0.20 seconds
,RATIONALE: The PR interval represents the time from atrial depolarization (P wave)
to ventricular depolarization (start of QRS). This interval reflects conduction through
the atria and AV node. A normal PR interval is 0.12 to 0.20 seconds (3 to 5 small
boxes on standard EKG paper). Intervals shorter than 0.12 seconds suggest pre-
excitation (Wolff-Parkinson-White syndrome), while intervals longer than 0.20
seconds indicate first-degree AV block.
QUESTION 2
The normal QRS complex duration in adults is:
A) Less than 0.08 seconds
B) 0.08 to 0.12 seconds
C) 0.12 to 0.16 seconds
D) 0.16 to 0.20 seconds
E) 0.20 to 0.24 seconds
CORRECT ANSWER: B) 0.08 to 0.12 seconds
RATIONALE: The QRS complex represents rapid ventricular depolarization. A
normal QRS duration is less than 0.12 seconds (or 3 small boxes), with optimal
duration 0.08 to 0.10 seconds. A QRS duration of 0.12 seconds or greater indicates
bundle branch block or ventricular rhythm. Measuring the QRS is crucial for
distinguishing supraventricular from ventricular arrhythmias.
QUESTION 3
What is the normal duration of the QT interval at a heart rate of 60 bpm?
A) 0.24 to 0.32 seconds
B) 0.32 to 0.40 seconds
C) 0.40 to 0.44 seconds
D) 0.44 to 0.52 seconds
,E) 0.52 to 0.60 seconds
CORRECT ANSWER: C) 0.40 to 0.44 seconds
RATIONALE: The QT interval represents total ventricular depolarization and
repolarization time. At a heart rate of 60 bpm, the normal QT interval is 0.40 to 0.44
seconds. The QT interval varies inversely with heart rate (faster heart rate = shorter
QT), so it must be corrected using the QTc formula. A prolonged QT interval
increases risk for torsades de pointes, a dangerous polymorphic ventricular
arrhythmia.
QUESTION 4
The normal P wave duration should not exceed:
A) 0.06 seconds
B) 0.08 seconds
C) 0.10 seconds
D) 0.12 seconds
E) 0.14 seconds
CORRECT ANSWER: D) 0.12 seconds
RATIONALE: The P wave represents atrial depolarization. Normal P wave duration
is 0.08 to 0.12 seconds (2 to 3 small boxes). A P wave exceeding 0.12 seconds
indicates left atrial enlargement (seen in mitral stenosis, hypertension, or heart
failure). A notched or biphasic P wave also suggests left atrial abnormality,
sometimes called "P mitrale."
QUESTION 5
The normal amplitude of the P wave in lead II is:
A) Less than 1 mm
B) 1 to 2 mm
, C) 2 to 3 mm
D) 3 to 4 mm
E) Greater than 4 mm
CORRECT ANSWER: C) 2 to 3 mm
RATIONALE: In lead II, the normal P wave amplitude ranges from 0.5 to 2.5 mm
(with typical values 2 to 3 mm in normal individuals). P wave amplitude exceeding
2.5 mm in lead II or V1 suggests right atrial enlargement (P pulmonale), typically
seen in chronic lung disease, pulmonary hypertension, or tricuspid stenosis.
QUESTION 6
On a standard 25 mm/second EKG paper, one small box represents a time
interval of:
A) 0.02 seconds
B) 0.04 seconds
C) 0.06 seconds
D) 0.08 seconds
E) 0.10 seconds
CORRECT ANSWER: B) 0.04 seconds
RATIONALE: Standard EKG paper runs at 25 mm/second. Each small box (1 mm
wide) represents 0.04 seconds. Five small boxes (5 mm) equal one large box
representing 0.20 seconds. This standardization is critical for accurately measuring
intervals and calculating heart rate. Remember: 1 small box = 0.04 sec; 1 large box
= 0.20 sec; 15 large boxes = 3 seconds; 300 large boxes = 1 minute.
QUESTION 7
The normal ST segment should be isoelectric, meaning:
GUIDE & PRACTICE QUESTIONS WITH
ANSWERS AND RATIONALES
BAYCARE EKG TEST 2026/2027 | STUDY GUIDE & PRACTICE QUESTIONS WITH
ANSWERS AND RATIONALES
OVERVIEW & STUDY FEATURES:
• Comprehensive Coverage: 200 meticulously organized questions spanning all
major EKG interpretation topics including normal findings, arrhythmias, ischemia,
infarction, blocks, hypertrophy, and electrolyte disturbances—ensuring complete
exam preparation.
• Study Strategy: Work through questions systematically by topic, review rationales
after each section, identify weak areas, and re-attempt incorrect questions; this
method reinforces pattern recognition essential for rapid clinical EKG
interpretation.
SECTION 1: NORMAL EKG INTERVALS AND MEASUREMENTS
QUESTION 1
The normal PR interval duration on a standard EKG is:
A) 0.08 to 0.10 seconds
B) 0.12 to 0.20 seconds
C) 0.16 to 0.24 seconds
D) 0.20 to 0.28 seconds
E) 0.24 to 0.32 seconds
CORRECT ANSWER: B) 0.12 to 0.20 seconds
,RATIONALE: The PR interval represents the time from atrial depolarization (P wave)
to ventricular depolarization (start of QRS). This interval reflects conduction through
the atria and AV node. A normal PR interval is 0.12 to 0.20 seconds (3 to 5 small
boxes on standard EKG paper). Intervals shorter than 0.12 seconds suggest pre-
excitation (Wolff-Parkinson-White syndrome), while intervals longer than 0.20
seconds indicate first-degree AV block.
QUESTION 2
The normal QRS complex duration in adults is:
A) Less than 0.08 seconds
B) 0.08 to 0.12 seconds
C) 0.12 to 0.16 seconds
D) 0.16 to 0.20 seconds
E) 0.20 to 0.24 seconds
CORRECT ANSWER: B) 0.08 to 0.12 seconds
RATIONALE: The QRS complex represents rapid ventricular depolarization. A
normal QRS duration is less than 0.12 seconds (or 3 small boxes), with optimal
duration 0.08 to 0.10 seconds. A QRS duration of 0.12 seconds or greater indicates
bundle branch block or ventricular rhythm. Measuring the QRS is crucial for
distinguishing supraventricular from ventricular arrhythmias.
QUESTION 3
What is the normal duration of the QT interval at a heart rate of 60 bpm?
A) 0.24 to 0.32 seconds
B) 0.32 to 0.40 seconds
C) 0.40 to 0.44 seconds
D) 0.44 to 0.52 seconds
,E) 0.52 to 0.60 seconds
CORRECT ANSWER: C) 0.40 to 0.44 seconds
RATIONALE: The QT interval represents total ventricular depolarization and
repolarization time. At a heart rate of 60 bpm, the normal QT interval is 0.40 to 0.44
seconds. The QT interval varies inversely with heart rate (faster heart rate = shorter
QT), so it must be corrected using the QTc formula. A prolonged QT interval
increases risk for torsades de pointes, a dangerous polymorphic ventricular
arrhythmia.
QUESTION 4
The normal P wave duration should not exceed:
A) 0.06 seconds
B) 0.08 seconds
C) 0.10 seconds
D) 0.12 seconds
E) 0.14 seconds
CORRECT ANSWER: D) 0.12 seconds
RATIONALE: The P wave represents atrial depolarization. Normal P wave duration
is 0.08 to 0.12 seconds (2 to 3 small boxes). A P wave exceeding 0.12 seconds
indicates left atrial enlargement (seen in mitral stenosis, hypertension, or heart
failure). A notched or biphasic P wave also suggests left atrial abnormality,
sometimes called "P mitrale."
QUESTION 5
The normal amplitude of the P wave in lead II is:
A) Less than 1 mm
B) 1 to 2 mm
, C) 2 to 3 mm
D) 3 to 4 mm
E) Greater than 4 mm
CORRECT ANSWER: C) 2 to 3 mm
RATIONALE: In lead II, the normal P wave amplitude ranges from 0.5 to 2.5 mm
(with typical values 2 to 3 mm in normal individuals). P wave amplitude exceeding
2.5 mm in lead II or V1 suggests right atrial enlargement (P pulmonale), typically
seen in chronic lung disease, pulmonary hypertension, or tricuspid stenosis.
QUESTION 6
On a standard 25 mm/second EKG paper, one small box represents a time
interval of:
A) 0.02 seconds
B) 0.04 seconds
C) 0.06 seconds
D) 0.08 seconds
E) 0.10 seconds
CORRECT ANSWER: B) 0.04 seconds
RATIONALE: Standard EKG paper runs at 25 mm/second. Each small box (1 mm
wide) represents 0.04 seconds. Five small boxes (5 mm) equal one large box
representing 0.20 seconds. This standardization is critical for accurately measuring
intervals and calculating heart rate. Remember: 1 small box = 0.04 sec; 1 large box
= 0.20 sec; 15 large boxes = 3 seconds; 300 large boxes = 1 minute.
QUESTION 7
The normal ST segment should be isoelectric, meaning:
