BASIC ARRHYTHMIA Sentara Exam 2026/2027
UPDATED QUESTIONS WITH ANSWERS GRADED A+
• PR interval length -✓✓ 0.12 - 0.20 seconds
• QRS Interval length -✓✓ 0.06 - 0.12 seconds
• QT Interval length -✓✓ 0.32 - 0.44 seconds
• Length of small squares on EKG -✓✓ 0.04 seconds
• Length of regular squares on EKG -✓✓ 0.2 seconds
• P wave represents -✓✓ atrial depolarization (contraction)
• QRS represents -✓✓ ventricular depolarization (contraction)
• QTI represents -✓✓ Inherent Rate of Purkinjie fibers
• Normal Sinus Rhythm Interpretation -✓✓ P wave: Upright, uniform, round,
before each QRS
PRI: 0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds
Rhythm: Regular Rate: 60-100
, • What indicates that the electrical impulse is generated by the sinus node and is
following the normal conduction pathway through the atria? -✓✓ Rounded upright
P waves
• Sinus Bradycardia Interpretation -✓✓ P wave: Upright, uniform, rounded, before
each QRS PRI: 0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds
Rhythm: Regular Rate: Less than 60
• Sinus Tachycardia Interpretation -✓✓ P wave: Upright, uniform, round, before
each QRS PRI: 0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds Rhythm: Regular
Rate: 101-150
• Sinus Arrhythmia Interpretation -✓✓ P wave: Upright, uniform, before each QRS
PRI: 0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds Rhythm: Irregular (regularly
irregular) Rate: 60 -100
• Sinus Arrest Interpretation -✓✓ P wave: Upright, uniform, before each QRS PRI:
0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds Rhythm: Regular R to R in Sinus
Rhythm; R to R irregularity across pause Rate: Usually 60 -100 but could be
bradycardic rate
• How do you calculate length of pause (in time) for sinus arrest? -✓✓ by counting
the number of small boxes between the two R waves that come right before and
right after the pause and multiplying by 0.04 seconds.
• Sinus Block Interpretation -✓✓ P wave: Upright, uniform, before each QRS PRI:
0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds Rhythm: Regular except for missing
beats Rate: Usually 60 - 100, but could be bradycardic rate
UPDATED QUESTIONS WITH ANSWERS GRADED A+
• PR interval length -✓✓ 0.12 - 0.20 seconds
• QRS Interval length -✓✓ 0.06 - 0.12 seconds
• QT Interval length -✓✓ 0.32 - 0.44 seconds
• Length of small squares on EKG -✓✓ 0.04 seconds
• Length of regular squares on EKG -✓✓ 0.2 seconds
• P wave represents -✓✓ atrial depolarization (contraction)
• QRS represents -✓✓ ventricular depolarization (contraction)
• QTI represents -✓✓ Inherent Rate of Purkinjie fibers
• Normal Sinus Rhythm Interpretation -✓✓ P wave: Upright, uniform, round,
before each QRS
PRI: 0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds
Rhythm: Regular Rate: 60-100
, • What indicates that the electrical impulse is generated by the sinus node and is
following the normal conduction pathway through the atria? -✓✓ Rounded upright
P waves
• Sinus Bradycardia Interpretation -✓✓ P wave: Upright, uniform, rounded, before
each QRS PRI: 0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds
Rhythm: Regular Rate: Less than 60
• Sinus Tachycardia Interpretation -✓✓ P wave: Upright, uniform, round, before
each QRS PRI: 0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds Rhythm: Regular
Rate: 101-150
• Sinus Arrhythmia Interpretation -✓✓ P wave: Upright, uniform, before each QRS
PRI: 0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds Rhythm: Irregular (regularly
irregular) Rate: 60 -100
• Sinus Arrest Interpretation -✓✓ P wave: Upright, uniform, before each QRS PRI:
0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds Rhythm: Regular R to R in Sinus
Rhythm; R to R irregularity across pause Rate: Usually 60 -100 but could be
bradycardic rate
• How do you calculate length of pause (in time) for sinus arrest? -✓✓ by counting
the number of small boxes between the two R waves that come right before and
right after the pause and multiplying by 0.04 seconds.
• Sinus Block Interpretation -✓✓ P wave: Upright, uniform, before each QRS PRI:
0.12 - 0.20 seconds QRS: 0.06 - 0.12 seconds Rhythm: Regular except for missing
beats Rate: Usually 60 - 100, but could be bradycardic rate
