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BayCare EKG Test Actual Exam 2026/2027 –
Complete Exam-Style Questions with
Detailed Rationales | 100% Verified | Pass
Guaranteed – A+ Graded
[SECTION 1: EKG Basics & Waveform Components — Questions 1-15]
Q1: A telemetry technician notes that the EKG paper speed is set to the standard 25 mm/sec.
How much time is represented by one small square on the EKG grid?
A. 0.04 seconds
B. 0.10 seconds
C. 0.20 seconds
D. 0.12 seconds
Correct Answer: A
Rationale: At a standard paper speed of 25 mm/sec, each small square (1 mm) represents 0.04
seconds, and each large square (5 mm) represents 0.20 seconds. This standardization allows for
the precise calculation of intervals such as the PR interval, QRS duration, and QT interval.
Options C and D represent a large square and the upper limit of a normal PR interval,
respectively, while B is incorrect.
Q2: The nurse is evaluating lead placement. Which limb lead is considered bipolar and records
the electrical difference between the left arm and right arm electrodes?
A. Lead II
B. Lead aVR
C. Lead MCL1
D. Lead I
Correct Answer: D
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Rationale: Lead I is a bipolar limb lead that measures the electrical potential difference between
the left arm (positive) and the right arm (negative). Lead II is also bipolar but uses the right arm
and left leg. Lead aVR is an augmented unipolar lead, and MCL1 is a modified chest lead, not a
standard limb lead.
Q3: When calibrating the EKG machine, the standard voltage is set so that 1 millivolt (mV)
equals a specific height on the paper. What is this standard calibration?
A. 5 mm
B. 15 mm
C. 10 mm
D. 20 mm
Correct Answer: C
Rationale: Standard EKG calibration stipulates that a 1 millivolt (mV) electrical signal should
produce a deflection of 10 mm (two large squares) in height. This standard ensures that wave
amplitudes, such as the height of the R wave or depth of the Q wave, are measured consistently
to assess for hypertrophy or infarction. Deviations from this (e.g., half-standard) must be noted to
avoid misinterpretation.
Q4: Which electrocardiographic interval represents the time required for ventricular
depolarization and repolarization?
A. PR interval
B. QRS duration
C. QT interval
D. ST segment
Correct Answer: C
Rationale: The QT interval measures the total time from the start of ventricular depolarization
(onset of the QRS complex) to the end of ventricular repolarization (end of the T wave). It is
crucial for assessing the risk of arrhythmias like Torsades de pointes. The PR interval represents
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atrial depolarization and AV node conduction, the QRS represents only ventricular
depolarization, and the ST segment represents early ventricular repolarization.
Q5: A nurse assesses a patient's EKG and notes an upright P wave in lead II, a PR interval of
0.16 seconds, and a QRS duration of 0.08 seconds. These findings indicate:
A. Normal Sinus Rhythm criteria
B. First-degree AV block
C. Ventricular tachycardia
D. Atrial fibrillation
Correct Answer: A
Rationale: These findings meet the criteria for Normal Sinus Rhythm (NSR): the P wave is
upright in lead II (indicating sinus origin), the PR interval is within the normal range of 0.12–
0.20 seconds, and the QRS duration is narrow (<0.12 seconds). First-degree AV block would
require a PR interval >0.20 seconds, and the other options would present with significantly
different morphologies and rates.
Q6: Which of the following statements accurately describes the ST segment?
A. It represents atrial repolarization.
B. It is normally isoelectric and connects the QRS complex to the T wave.
C. It is measured from the end of the P wave to the start of the QRS complex.
D. It is always elevated in a healthy adult.
Correct Answer: B
Rationale: The ST segment represents the period when the ventricles are completely depolarized
and begins to repolarize; it is normally flat (isoelectric). Elevation or depression of this segment
is a key indicator of ischemia, injury, or infarction. Option A is incorrect because atrial
repolarization is hidden by the QRS complex, Option C describes the PR segment, and Option D
is false as elevation is pathological.
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Q7: The nurse calculates the corrected QT interval (QTc) using Bazett’s formula. If the QT
interval is 0.44 seconds and the RR interval is 0.80 seconds, what is the QTc?
A. 0.44 seconds
B. 0.49 seconds
C. 0.55 seconds
D. 0.40 seconds
Correct Answer: B
Rationale: Using Bazett’s formula (QTc = QT / √RR), the square root of 0.80 is approximately
0.89. Dividing the QT (0.44) by 0.89 results in a QTc of approximately 0.49 seconds (490 ms).
This is a prolonged QTc (>460ms in women, >440ms in men), which places the patient at risk
for life-threatening arrhythmias. Simple addition or subtraction without the formula will yield
incorrect results.
Q8: Which precordial leads are primarily used to assess the interventricular septum?
A. V1 and V2
B. V3 and V4
C. V5 and V6
D. Leads I and aVL
Correct Answer: A
Rationale: Leads V1 and V2 are septal leads that face the interventricular septum. Abnormalities
in these leads (such as Q waves or ST changes) are indicative of septal myocardial infarction or
hypertrophy. V3 and V4 are anterior leads, V5 and V6 are lateral leads, and I/aVL are lateral
limb leads.
Q9: A patient has low voltage QRS complexes on the EKG. The nurse recognizes that this is
often associated with which condition?
A. Left Ventricular Hypertrophy
B. Pericardial effusion
BayCare EKG Test Actual Exam 2026/2027 –
Complete Exam-Style Questions with
Detailed Rationales | 100% Verified | Pass
Guaranteed – A+ Graded
[SECTION 1: EKG Basics & Waveform Components — Questions 1-15]
Q1: A telemetry technician notes that the EKG paper speed is set to the standard 25 mm/sec.
How much time is represented by one small square on the EKG grid?
A. 0.04 seconds
B. 0.10 seconds
C. 0.20 seconds
D. 0.12 seconds
Correct Answer: A
Rationale: At a standard paper speed of 25 mm/sec, each small square (1 mm) represents 0.04
seconds, and each large square (5 mm) represents 0.20 seconds. This standardization allows for
the precise calculation of intervals such as the PR interval, QRS duration, and QT interval.
Options C and D represent a large square and the upper limit of a normal PR interval,
respectively, while B is incorrect.
Q2: The nurse is evaluating lead placement. Which limb lead is considered bipolar and records
the electrical difference between the left arm and right arm electrodes?
A. Lead II
B. Lead aVR
C. Lead MCL1
D. Lead I
Correct Answer: D
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Rationale: Lead I is a bipolar limb lead that measures the electrical potential difference between
the left arm (positive) and the right arm (negative). Lead II is also bipolar but uses the right arm
and left leg. Lead aVR is an augmented unipolar lead, and MCL1 is a modified chest lead, not a
standard limb lead.
Q3: When calibrating the EKG machine, the standard voltage is set so that 1 millivolt (mV)
equals a specific height on the paper. What is this standard calibration?
A. 5 mm
B. 15 mm
C. 10 mm
D. 20 mm
Correct Answer: C
Rationale: Standard EKG calibration stipulates that a 1 millivolt (mV) electrical signal should
produce a deflection of 10 mm (two large squares) in height. This standard ensures that wave
amplitudes, such as the height of the R wave or depth of the Q wave, are measured consistently
to assess for hypertrophy or infarction. Deviations from this (e.g., half-standard) must be noted to
avoid misinterpretation.
Q4: Which electrocardiographic interval represents the time required for ventricular
depolarization and repolarization?
A. PR interval
B. QRS duration
C. QT interval
D. ST segment
Correct Answer: C
Rationale: The QT interval measures the total time from the start of ventricular depolarization
(onset of the QRS complex) to the end of ventricular repolarization (end of the T wave). It is
crucial for assessing the risk of arrhythmias like Torsades de pointes. The PR interval represents
,3
atrial depolarization and AV node conduction, the QRS represents only ventricular
depolarization, and the ST segment represents early ventricular repolarization.
Q5: A nurse assesses a patient's EKG and notes an upright P wave in lead II, a PR interval of
0.16 seconds, and a QRS duration of 0.08 seconds. These findings indicate:
A. Normal Sinus Rhythm criteria
B. First-degree AV block
C. Ventricular tachycardia
D. Atrial fibrillation
Correct Answer: A
Rationale: These findings meet the criteria for Normal Sinus Rhythm (NSR): the P wave is
upright in lead II (indicating sinus origin), the PR interval is within the normal range of 0.12–
0.20 seconds, and the QRS duration is narrow (<0.12 seconds). First-degree AV block would
require a PR interval >0.20 seconds, and the other options would present with significantly
different morphologies and rates.
Q6: Which of the following statements accurately describes the ST segment?
A. It represents atrial repolarization.
B. It is normally isoelectric and connects the QRS complex to the T wave.
C. It is measured from the end of the P wave to the start of the QRS complex.
D. It is always elevated in a healthy adult.
Correct Answer: B
Rationale: The ST segment represents the period when the ventricles are completely depolarized
and begins to repolarize; it is normally flat (isoelectric). Elevation or depression of this segment
is a key indicator of ischemia, injury, or infarction. Option A is incorrect because atrial
repolarization is hidden by the QRS complex, Option C describes the PR segment, and Option D
is false as elevation is pathological.
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Q7: The nurse calculates the corrected QT interval (QTc) using Bazett’s formula. If the QT
interval is 0.44 seconds and the RR interval is 0.80 seconds, what is the QTc?
A. 0.44 seconds
B. 0.49 seconds
C. 0.55 seconds
D. 0.40 seconds
Correct Answer: B
Rationale: Using Bazett’s formula (QTc = QT / √RR), the square root of 0.80 is approximately
0.89. Dividing the QT (0.44) by 0.89 results in a QTc of approximately 0.49 seconds (490 ms).
This is a prolonged QTc (>460ms in women, >440ms in men), which places the patient at risk
for life-threatening arrhythmias. Simple addition or subtraction without the formula will yield
incorrect results.
Q8: Which precordial leads are primarily used to assess the interventricular septum?
A. V1 and V2
B. V3 and V4
C. V5 and V6
D. Leads I and aVL
Correct Answer: A
Rationale: Leads V1 and V2 are septal leads that face the interventricular septum. Abnormalities
in these leads (such as Q waves or ST changes) are indicative of septal myocardial infarction or
hypertrophy. V3 and V4 are anterior leads, V5 and V6 are lateral leads, and I/aVL are lateral
limb leads.
Q9: A patient has low voltage QRS complexes on the EKG. The nurse recognizes that this is
often associated with which condition?
A. Left Ventricular Hypertrophy
B. Pericardial effusion
