AYCARE EKG TEST 2025-2026 |
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Solved Questions | Correct Answers |
Baycare EKG Exam Prep | Rhythm
Recognition | Pass Guaranteed - A+
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**[DOMAIN 1: EKG BASICS & WAVEFORM COMPONENTS - 35 Questions]**
* *1. What is the standard EKG paper speed?**
- A) 50 mm/sec
- B) 25 mm/sec **[CORRECT]**
- C) 10 mm/sec
- D) 100 mm/sec
* *Rationale:** The standard EKG paper speed is 25 mm/second. This standardization allows for
consistent interpretation across different EKG machines and clinical settings. At this speed, time
measurements can be accurately calculated using the grid lines on the paper.
* *2. What is the standard calibration for EKG amplitude?**
- A) 5 mm = 1 mV
- B) 10 mm = 1 mV **[CORRECT]**
- C) 20 mm = 1 mV
- D) 1 mm = 1 mV
* *Rationale:** Standard EKG calibration is 10 mm (10 small boxes) = 1 millivolt (mV). This
calibration allows for accurate measurement of waveform amplitudes. When checking
calibration, a 1 mV signal should produce a 10 mm deflection.
* *3. What does one small box (1 mm) represent in time?**
- A) 0.01 seconds
- B) 0.04 seconds (40 ms) **[CORRECT]**
- C) 0.10 seconds
- D) 0.20 seconds
,* *Rationale:** At standard paper speed of 25 mm/sec, each 1 mm small box represents 0.04
seconds (40 milliseconds). This is calculated by dividing 1 second by 25 mm. This
measurement is crucial for calculating intervals and rates.
* *4. What does one large box (5 mm) represent in time?**
- A) 0.04 seconds
- B) 0.10 seconds
- C) 0.20 seconds (200 ms) **[CORRECT]**
- D) 1.0 seconds
* *Rationale:** One large box consists of 5 small boxes. Since each small box is 0.04 seconds,
one large box equals 5 × 0.04 = 0.20 seconds (200 milliseconds). Large boxes are commonly
used for quick rate calculations.
* *5. How many large boxes equal one second?**
- A) 2 large boxes
- B) 5 large boxes **[CORRECT]**
- C) 10 large boxes
- D) 25 large boxes
* *Rationale:** Since one large box equals 0.20 seconds, five large boxes equal 1 second (5 ×
0.20 = 1.0). This relationship is useful for calculating heart rates and understanding the timing of
EKG waveforms.
* *6. How many large boxes equal 6 seconds?**
- A) 10 large boxes
- B) 20 large boxes
- C) 30 large boxes **[CORRECT]**
- D) 60 large boxes
* *Rationale:** Thirty large boxes equal 6 seconds (30 × 0.20 = 6.0). This measurement is
commonly used for calculating heart rates in irregular rhythms by counting the number of QRS
complexes within a 6-second strip and multiplying by 10.
* *7. What does the P wave represent?**
- A) Ventricular depolarization
- B) Atrial depolarization (contraction) **[CORRECT]**
- C) Ventricular repolarization
- D) Atrial repolarization
* *Rationale:** The P wave represents atrial depolarization, which is the electrical activation of
the atria leading to atrial contraction. Atrial repolarization is not visible on a standard EKG as it
occurs during the QRS complex and is obscured by the larger ventricular electrical activity.
,* *8. What is the normal P wave duration?**
- A) 0.12-0.20 seconds
- B) 0.06-0.12 seconds (less than 0.12) **[CORRECT]**
- C) 0.20-0.30 seconds
- D) Less than 0.06 seconds
* *Rationale:** Normal P wave duration is 0.06-0.12 seconds (1.5-3 small boxes). A P wave
duration greater than 0.12 seconds suggests left atrial enlargement or intra-atrial conduction
delay, often seen in conditions like mitral valve disease.
* *9. What is the normal P wave amplitude in limb leads?**
- A) Less than 5 mm
- B) Less than 2.5 mm **[CORRECT]**
- C) Less than 1 mm
- D) Greater than 3 mm
* *Rationale:** Normal P wave amplitude is less than 2.5 mm in the limb leads. Increased
amplitude (tall, peaked P waves) may indicate right atrial enlargement (P pulmonale), commonly
associated with pulmonary disease or pulmonary hypertension.
* *10. What does the PR interval represent?**
- A) Time from ventricular depolarization to repolarization
- B) Time from atrial depolarization to ventricular depolarization (conduction through AV node)
**[CORRECT]**
- C) Time of ventricular contraction only
- D) Time of atrial relaxation only
* *Rationale:** The PR interval represents the time from the beginning of atrial depolarization (P
wave) to the beginning of ventricular depolarization (QRS complex). This includes conduction
through the atria, AV node, and His-Purkinje system. The AV node conduction creates the
majority of the PR interval duration.
* *11. What is the normal PR interval?**
- A) 0.06-0.10 seconds
- B) 0.12-0.20 seconds (3-5 small boxes) **[CORRECT]**
- C) 0.20-0.30 seconds
- D) 0.24-0.40 seconds
* *Rationale:** The normal PR interval is 0.12-0.20 seconds (3-5 small boxes). A PR interval less
than 0.12 seconds suggests pre-excitation (WPW) or junctional rhythm. A PR interval greater
than 0.20 seconds indicates first-degree AV block.
* *12. What does the QRS complex represent?**
- A) Atrial depolarization
, - B) Ventricular depolarization **[CORRECT]**
- C) Atrial repolarization
- D) Ventricular repolarization only
* *Rationale:** The QRS complex represents ventricular depolarization, which is the electrical
activation of the ventricles leading to ventricular contraction. The QRS is typically much larger
than the P wave because the ventricles have greater muscle mass than the atria.
* *13. What is the normal QRS duration?**
- A) 0.12-0.20 seconds
- B) 0.06-0.10 seconds (1.5-2.5 small boxes) **[CORRECT]**
- C) 0.04-0.06 seconds
- D) 0.20-0.30 seconds
* *Rationale:** Normal QRS duration is 0.06-0.10 seconds (less than 0.12 seconds or 3 small
boxes). A QRS duration greater than 0.12 seconds indicates a wide complex rhythm, which may
be ventricular in origin or supraventricular with aberrant conduction (bundle branch block).
* *14. What does the QT interval represent?**
- A) Only ventricular depolarization
- B) Total ventricular activity (depolarization and repolarization) **[CORRECT]**
- C) Only atrial activity
- D) Only the PR interval
* *Rationale:** The QT interval represents the total time for ventricular activity, including both
depolarization (QRS) and repolarization (ST segment and T wave). It measures the duration of
ventricular systole and is important for assessing risk of ventricular arrhythmias.
* *15. What is the normal QT interval?**
- A) Fixed at 0.40 seconds for all heart rates
- B) 0.36-0.44 seconds (varies with heart rate) **[CORRECT]**
- C) 0.20-0.30 seconds
- D) 0.50-0.60 seconds
* *Rationale:** The normal QT interval is 0.36-0.44 seconds but varies with heart rate—it
shortens with faster rates and lengthens with slower rates. Because of this rate-dependency, the
QT interval is often corrected (QTc) for heart rate comparison.
* *16. What is the formula for corrected QT (QTc)?**
- A) QTc = QT × heart rate
- B) QTc = QT / √(RR interval) **[CORRECT]**
- C) QTc = QT + RR interval
- D) QTc = QT × 2
B
Solved Questions | Correct Answers |
Baycare EKG Exam Prep | Rhythm
Recognition | Pass Guaranteed - A+
Graded
**[DOMAIN 1: EKG BASICS & WAVEFORM COMPONENTS - 35 Questions]**
* *1. What is the standard EKG paper speed?**
- A) 50 mm/sec
- B) 25 mm/sec **[CORRECT]**
- C) 10 mm/sec
- D) 100 mm/sec
* *Rationale:** The standard EKG paper speed is 25 mm/second. This standardization allows for
consistent interpretation across different EKG machines and clinical settings. At this speed, time
measurements can be accurately calculated using the grid lines on the paper.
* *2. What is the standard calibration for EKG amplitude?**
- A) 5 mm = 1 mV
- B) 10 mm = 1 mV **[CORRECT]**
- C) 20 mm = 1 mV
- D) 1 mm = 1 mV
* *Rationale:** Standard EKG calibration is 10 mm (10 small boxes) = 1 millivolt (mV). This
calibration allows for accurate measurement of waveform amplitudes. When checking
calibration, a 1 mV signal should produce a 10 mm deflection.
* *3. What does one small box (1 mm) represent in time?**
- A) 0.01 seconds
- B) 0.04 seconds (40 ms) **[CORRECT]**
- C) 0.10 seconds
- D) 0.20 seconds
,* *Rationale:** At standard paper speed of 25 mm/sec, each 1 mm small box represents 0.04
seconds (40 milliseconds). This is calculated by dividing 1 second by 25 mm. This
measurement is crucial for calculating intervals and rates.
* *4. What does one large box (5 mm) represent in time?**
- A) 0.04 seconds
- B) 0.10 seconds
- C) 0.20 seconds (200 ms) **[CORRECT]**
- D) 1.0 seconds
* *Rationale:** One large box consists of 5 small boxes. Since each small box is 0.04 seconds,
one large box equals 5 × 0.04 = 0.20 seconds (200 milliseconds). Large boxes are commonly
used for quick rate calculations.
* *5. How many large boxes equal one second?**
- A) 2 large boxes
- B) 5 large boxes **[CORRECT]**
- C) 10 large boxes
- D) 25 large boxes
* *Rationale:** Since one large box equals 0.20 seconds, five large boxes equal 1 second (5 ×
0.20 = 1.0). This relationship is useful for calculating heart rates and understanding the timing of
EKG waveforms.
* *6. How many large boxes equal 6 seconds?**
- A) 10 large boxes
- B) 20 large boxes
- C) 30 large boxes **[CORRECT]**
- D) 60 large boxes
* *Rationale:** Thirty large boxes equal 6 seconds (30 × 0.20 = 6.0). This measurement is
commonly used for calculating heart rates in irregular rhythms by counting the number of QRS
complexes within a 6-second strip and multiplying by 10.
* *7. What does the P wave represent?**
- A) Ventricular depolarization
- B) Atrial depolarization (contraction) **[CORRECT]**
- C) Ventricular repolarization
- D) Atrial repolarization
* *Rationale:** The P wave represents atrial depolarization, which is the electrical activation of
the atria leading to atrial contraction. Atrial repolarization is not visible on a standard EKG as it
occurs during the QRS complex and is obscured by the larger ventricular electrical activity.
,* *8. What is the normal P wave duration?**
- A) 0.12-0.20 seconds
- B) 0.06-0.12 seconds (less than 0.12) **[CORRECT]**
- C) 0.20-0.30 seconds
- D) Less than 0.06 seconds
* *Rationale:** Normal P wave duration is 0.06-0.12 seconds (1.5-3 small boxes). A P wave
duration greater than 0.12 seconds suggests left atrial enlargement or intra-atrial conduction
delay, often seen in conditions like mitral valve disease.
* *9. What is the normal P wave amplitude in limb leads?**
- A) Less than 5 mm
- B) Less than 2.5 mm **[CORRECT]**
- C) Less than 1 mm
- D) Greater than 3 mm
* *Rationale:** Normal P wave amplitude is less than 2.5 mm in the limb leads. Increased
amplitude (tall, peaked P waves) may indicate right atrial enlargement (P pulmonale), commonly
associated with pulmonary disease or pulmonary hypertension.
* *10. What does the PR interval represent?**
- A) Time from ventricular depolarization to repolarization
- B) Time from atrial depolarization to ventricular depolarization (conduction through AV node)
**[CORRECT]**
- C) Time of ventricular contraction only
- D) Time of atrial relaxation only
* *Rationale:** The PR interval represents the time from the beginning of atrial depolarization (P
wave) to the beginning of ventricular depolarization (QRS complex). This includes conduction
through the atria, AV node, and His-Purkinje system. The AV node conduction creates the
majority of the PR interval duration.
* *11. What is the normal PR interval?**
- A) 0.06-0.10 seconds
- B) 0.12-0.20 seconds (3-5 small boxes) **[CORRECT]**
- C) 0.20-0.30 seconds
- D) 0.24-0.40 seconds
* *Rationale:** The normal PR interval is 0.12-0.20 seconds (3-5 small boxes). A PR interval less
than 0.12 seconds suggests pre-excitation (WPW) or junctional rhythm. A PR interval greater
than 0.20 seconds indicates first-degree AV block.
* *12. What does the QRS complex represent?**
- A) Atrial depolarization
, - B) Ventricular depolarization **[CORRECT]**
- C) Atrial repolarization
- D) Ventricular repolarization only
* *Rationale:** The QRS complex represents ventricular depolarization, which is the electrical
activation of the ventricles leading to ventricular contraction. The QRS is typically much larger
than the P wave because the ventricles have greater muscle mass than the atria.
* *13. What is the normal QRS duration?**
- A) 0.12-0.20 seconds
- B) 0.06-0.10 seconds (1.5-2.5 small boxes) **[CORRECT]**
- C) 0.04-0.06 seconds
- D) 0.20-0.30 seconds
* *Rationale:** Normal QRS duration is 0.06-0.10 seconds (less than 0.12 seconds or 3 small
boxes). A QRS duration greater than 0.12 seconds indicates a wide complex rhythm, which may
be ventricular in origin or supraventricular with aberrant conduction (bundle branch block).
* *14. What does the QT interval represent?**
- A) Only ventricular depolarization
- B) Total ventricular activity (depolarization and repolarization) **[CORRECT]**
- C) Only atrial activity
- D) Only the PR interval
* *Rationale:** The QT interval represents the total time for ventricular activity, including both
depolarization (QRS) and repolarization (ST segment and T wave). It measures the duration of
ventricular systole and is important for assessing risk of ventricular arrhythmias.
* *15. What is the normal QT interval?**
- A) Fixed at 0.40 seconds for all heart rates
- B) 0.36-0.44 seconds (varies with heart rate) **[CORRECT]**
- C) 0.20-0.30 seconds
- D) 0.50-0.60 seconds
* *Rationale:** The normal QT interval is 0.36-0.44 seconds but varies with heart rate—it
shortens with faster rates and lengthens with slower rates. Because of this rate-dependency, the
QT interval is often corrected (QTc) for heart rate comparison.
* *16. What is the formula for corrected QT (QTc)?**
- A) QTc = QT × heart rate
- B) QTc = QT / √(RR interval) **[CORRECT]**
- C) QTc = QT + RR interval
- D) QTc = QT × 2
