Baycare EKG Test Actual Exam 2026/2027: Complete Exam-Style
Questions with Detailed Rationales | 100% Verified | Pass
Guaranteed – A+ Graded
TABLE OF CONTENTS
Section 1 | Cardiac Anatomy, Electrophysiology & Lead Placement | Q1 – Q10
Section 2 | Sinus & Atrial Rhythm Interpretation | Q11 – Q20
Section 3 | Junctional & Ventricular Arrhythmias | Q21 – Q30
Section 4 | AV Blocks & Conduction Defects | Q31 – Q40
Section 5 | 12-Lead Interpretation, STEMI & Clinical Scenarios | Q41 – Q50
Instructions: Choose the single best answer. Pass: 80% in 90 minutes.
══════════════════════════════════════
SECTION 1: CARDIAC ANATOMY, ELECTROPHYSIOLOGY & LEAD PLACEMENT Q1 –
Q10
══════════════════════════════════════
Question 1 of 50
A 58-year-old man is having a preoperative 12-lead EKG obtained in the holding area.
The technician places the V1 electrode in the fourth intercostal space at the left sternal
border instead of the right. Which EKG change is most likely to result from this
misplaced precordial lead?
A. ST-segment elevation in leads V1 through V3 suggesting an anterior wall MI
B. Poor R-wave progression across the precordial leads with possible septal changes ✓
CORRECT
C. Tall R waves in V1 consistent with right ventricular hypertrophy
D. Deep S waves in V5 and V6 suggesting left ventricular strain
Correct Answer: B
Rationale: Placing V1 on the left side instead of the right inverts normal septal
depolarization patterns and disrupts the expected gradual increase in R-wave amplitude
from V1 to V5. Tall R waves in V1 would suggest true RVH or posterior MI, not simple
,lead misplacement. Accurate V1 placement is at the fourth intercostal space
immediately to the right of the sternum.
Question 2 of 50
A 42-year-old marathon runner presents for a sports physical. His resting EKG shows a
heart rate of 52 with upright P waves in lead II, a constant PR interval of 0.18 seconds,
and narrow QRS complexes. What is the primary ionic movement responsible for the
plateau phase of his ventricular myocardial action potential?
A. Rapid influx of sodium through fast channels
B. Efflux of potassium through rectifier channels
C. Influx of calcium through L-type channels ✓ CORRECT
D. Efflux of chloride through ligand-gated channels
Correct Answer: C
Rationale: Phase 2 of the cardiac action potential, the plateau phase, is produced
primarily by calcium influx through L-type channels balanced against potassium efflux.
Sodium influx drives phase 0 depolarization, and while potassium efflux occurs during
repolarization, calcium influx is what creates the characteristic plateau. Understanding
this physiology explains why calcium channel blockers prolong the PR interval and slow
AV nodal conduction.
Question 3 of 50
A 67-year-old woman with chest pain arrives in the ED. The attending physician asks you
to identify which leads monitor the anterior wall of the left ventricle. Which lead
grouping should you select?
A. Leads V1 through V4 ✓ CORRECT
B. Leads II, III, and aVF
C. Leads I and aVL
D. Leads V5 and V6 only
, Correct Answer: A
Rationale: The precordial leads V1 through V4 overlie the anterior surface of the heart
and are the standard leads used to detect anterior wall ischemia or infarction. Leads II,
III, and aVF view the inferior wall, while I and aVL view the high lateral wall. V5 and V6
contribute to the lateral wall but do not cover the anterior septum and apex alone.
Question 4 of 50
A cardiology fellow is reviewing coronary anatomy with a new nurse. She explains that
in approximately 90% of the population, the sinoatrial node receives its blood supply
from which artery?
A. The left anterior descending artery
B. The circumflex artery
C. The diagonal branch of the left coronary artery
D. The right coronary artery ✓ CORRECT
Correct Answer: D
Rationale: In roughly 55% to 60% of people the SA node artery arises from the right
coronary artery, and in another 35% to 40% from the circumflex, making the RCA the
dominant overall supplier. The left anterior descending artery supplies the anterior wall
and septum but does not typically perfuse the SA node. This anatomy explains why
inferior MIs involving the RCA often present with sinus bradycardia or SA blocks.
Question 5 of 50
A telemetry technician is calibrating a three-lead monitoring system for a postoperative
patient. Which three bipolar limb leads form Einthoven's triangle used in standard
monitoring?
A. Leads aVR, aVL, and aVF
B. Leads I, II, and III ✓ CORRECT
C. Leads V1, V2, and V3
Questions with Detailed Rationales | 100% Verified | Pass
Guaranteed – A+ Graded
TABLE OF CONTENTS
Section 1 | Cardiac Anatomy, Electrophysiology & Lead Placement | Q1 – Q10
Section 2 | Sinus & Atrial Rhythm Interpretation | Q11 – Q20
Section 3 | Junctional & Ventricular Arrhythmias | Q21 – Q30
Section 4 | AV Blocks & Conduction Defects | Q31 – Q40
Section 5 | 12-Lead Interpretation, STEMI & Clinical Scenarios | Q41 – Q50
Instructions: Choose the single best answer. Pass: 80% in 90 minutes.
══════════════════════════════════════
SECTION 1: CARDIAC ANATOMY, ELECTROPHYSIOLOGY & LEAD PLACEMENT Q1 –
Q10
══════════════════════════════════════
Question 1 of 50
A 58-year-old man is having a preoperative 12-lead EKG obtained in the holding area.
The technician places the V1 electrode in the fourth intercostal space at the left sternal
border instead of the right. Which EKG change is most likely to result from this
misplaced precordial lead?
A. ST-segment elevation in leads V1 through V3 suggesting an anterior wall MI
B. Poor R-wave progression across the precordial leads with possible septal changes ✓
CORRECT
C. Tall R waves in V1 consistent with right ventricular hypertrophy
D. Deep S waves in V5 and V6 suggesting left ventricular strain
Correct Answer: B
Rationale: Placing V1 on the left side instead of the right inverts normal septal
depolarization patterns and disrupts the expected gradual increase in R-wave amplitude
from V1 to V5. Tall R waves in V1 would suggest true RVH or posterior MI, not simple
,lead misplacement. Accurate V1 placement is at the fourth intercostal space
immediately to the right of the sternum.
Question 2 of 50
A 42-year-old marathon runner presents for a sports physical. His resting EKG shows a
heart rate of 52 with upright P waves in lead II, a constant PR interval of 0.18 seconds,
and narrow QRS complexes. What is the primary ionic movement responsible for the
plateau phase of his ventricular myocardial action potential?
A. Rapid influx of sodium through fast channels
B. Efflux of potassium through rectifier channels
C. Influx of calcium through L-type channels ✓ CORRECT
D. Efflux of chloride through ligand-gated channels
Correct Answer: C
Rationale: Phase 2 of the cardiac action potential, the plateau phase, is produced
primarily by calcium influx through L-type channels balanced against potassium efflux.
Sodium influx drives phase 0 depolarization, and while potassium efflux occurs during
repolarization, calcium influx is what creates the characteristic plateau. Understanding
this physiology explains why calcium channel blockers prolong the PR interval and slow
AV nodal conduction.
Question 3 of 50
A 67-year-old woman with chest pain arrives in the ED. The attending physician asks you
to identify which leads monitor the anterior wall of the left ventricle. Which lead
grouping should you select?
A. Leads V1 through V4 ✓ CORRECT
B. Leads II, III, and aVF
C. Leads I and aVL
D. Leads V5 and V6 only
, Correct Answer: A
Rationale: The precordial leads V1 through V4 overlie the anterior surface of the heart
and are the standard leads used to detect anterior wall ischemia or infarction. Leads II,
III, and aVF view the inferior wall, while I and aVL view the high lateral wall. V5 and V6
contribute to the lateral wall but do not cover the anterior septum and apex alone.
Question 4 of 50
A cardiology fellow is reviewing coronary anatomy with a new nurse. She explains that
in approximately 90% of the population, the sinoatrial node receives its blood supply
from which artery?
A. The left anterior descending artery
B. The circumflex artery
C. The diagonal branch of the left coronary artery
D. The right coronary artery ✓ CORRECT
Correct Answer: D
Rationale: In roughly 55% to 60% of people the SA node artery arises from the right
coronary artery, and in another 35% to 40% from the circumflex, making the RCA the
dominant overall supplier. The left anterior descending artery supplies the anterior wall
and septum but does not typically perfuse the SA node. This anatomy explains why
inferior MIs involving the RCA often present with sinus bradycardia or SA blocks.
Question 5 of 50
A telemetry technician is calibrating a three-lead monitoring system for a postoperative
patient. Which three bipolar limb leads form Einthoven's triangle used in standard
monitoring?
A. Leads aVR, aVL, and aVF
B. Leads I, II, and III ✓ CORRECT
C. Leads V1, V2, and V3
