N300 Exam 5 Questions and Answers Already Passed Latest Update 2025-2026
What is the primary risk factor for cardiac dysrhythmias? - Answers Age
What are other risk factors for cardiac dysrhythmias? - Answers myocardial infarction,
hypertension, heart valve disease, heart failure, cardiomyopathy, infections, diabetes mellitus,
sleep apnea, heart surgery, electrolyte disturbance, recreational drug use, medicine toxicity
What are symptoms that would require treatment for a cardiac dysrhythmia? - Answers
palpitations, hypotension, diaphoresis, SOB, syncope, light-headedness, weakness and fatigue,
dizziness, anxiety
which lead is the best to interpret rhythms? - Answers Lead 2
What is the standard speed for ECG paper - Answers 25 mm per second
Each small box on ECG paper is how high and how many seconds? - Answers 1 mm in height
and 0.04 seconds in length
How are larger boxes on ECG papers divided? - Answers five small boxes in height and 5 small
boxes in length
One larger box on ECG paper equals: - Answers 0.20 seconds long (0.04 X 5)
What is the first wave seen on ECG strip? - Answers P wave
How should the P wave on ECG strip look? - Answers upright, rounded, not longer than 0.1
seconds in length, no higher than 2.5 mm
What wave is seen after the P wave on ECG strip? - Answers QRS
What does the QRS wave represent? - Answers ventricular depolarization
How is the QRS wave supposed to look on ECG? - Answers pointy and skinny in width
What is a wide QRS wave and what does that mean? - Answers greater than 0.1 in length, means
something occurring in ventricles causing widening
What wave comes after the QRS wave? - Answers T wave
What does the T wave represent on an ECG strip? - Answers Ventricular Repolarization
What can the T wave help monitor? - Answers extreme electrolyte imbalances such as
hypokalemia, hyperkalemia, disturbances with myocardial oxygen supply, other cardiac
disorders such as pericarditis, ventricular aneurysm
What is an interval on ECG strip? - Answers measure of time it takes for the impulse to travel
from one wave to the next - PR, QRS, QT
, What is the PR interval? - Answers time it takes electrical impulse to depolarize atria and travel
to ventricles, beginning at P wave and ending at QRS complex
What is the QRS interval? - Answers time to depolarize ventricles, measured from QRS complex
leaves baseline to when it returns
What is the length of the QRS interval? - Answers 0.06-0.1
What is the QT interval? - Answers measure of time it takes ventricles to depolarize and
repolarize, starts where QRS leaves baseline to where T returns to baseline, heart rate
dependent
What is the length of the QT interval? - Answers usually less than 0.52 seconds
What are the different steps in ECG interpretation? - Answers is the rate fast/slow/normal? Is
the rhythm regular? Are complexes equal distance? Are P waves present? Are QRS complexes
present? Are T waves present? Are intervals within normal limits? Are there P waves before
every QRS? Is there QRS after every P?
How do you calculate heart rate from ECG strip? - Answers Count number of QRS complexes
that fall within 6 second strip and multiply by 10, count number are R waves and divide into
1500
What is sinus bradycardia? - Answers regular rhythm with rate less than 60 bpm, can be normal
for athletes, can occur during sleep
What are some causes of sinus bradycardia? - Answers hypoxia, hypothermia
What are symptoms of sinus bradycardia that would require treatment? - Answers syncope,
chest pain, hypotension, SOB, diaphoresis
What is the treatment for sinus bradycardia? - Answers atropine 1 mg IV push, use of
pacemaker if not sufficient
What is sinus tachycardia? - Answers regular rhythm with rate greater than 100 bpm
What are some causes of sinus tachycardia? - Answers fever, anemia, hypovolemia,
hypotension, PE, myocardial infarction
What is the treatment for sinus tachycardia? - Answers based on symptoms - anemia may
require RBCs & IV fluid, medications such as beta blockers or calcium channel blockers control
or reduce HR
What are PACs? - Answers Premature atrial contractions - non life threatening dysrhythmia seen
in NSR
What are the causes of PACs - Answers hypoxia, excessive stimulant ingestion, coronary artery
What is the primary risk factor for cardiac dysrhythmias? - Answers Age
What are other risk factors for cardiac dysrhythmias? - Answers myocardial infarction,
hypertension, heart valve disease, heart failure, cardiomyopathy, infections, diabetes mellitus,
sleep apnea, heart surgery, electrolyte disturbance, recreational drug use, medicine toxicity
What are symptoms that would require treatment for a cardiac dysrhythmia? - Answers
palpitations, hypotension, diaphoresis, SOB, syncope, light-headedness, weakness and fatigue,
dizziness, anxiety
which lead is the best to interpret rhythms? - Answers Lead 2
What is the standard speed for ECG paper - Answers 25 mm per second
Each small box on ECG paper is how high and how many seconds? - Answers 1 mm in height
and 0.04 seconds in length
How are larger boxes on ECG papers divided? - Answers five small boxes in height and 5 small
boxes in length
One larger box on ECG paper equals: - Answers 0.20 seconds long (0.04 X 5)
What is the first wave seen on ECG strip? - Answers P wave
How should the P wave on ECG strip look? - Answers upright, rounded, not longer than 0.1
seconds in length, no higher than 2.5 mm
What wave is seen after the P wave on ECG strip? - Answers QRS
What does the QRS wave represent? - Answers ventricular depolarization
How is the QRS wave supposed to look on ECG? - Answers pointy and skinny in width
What is a wide QRS wave and what does that mean? - Answers greater than 0.1 in length, means
something occurring in ventricles causing widening
What wave comes after the QRS wave? - Answers T wave
What does the T wave represent on an ECG strip? - Answers Ventricular Repolarization
What can the T wave help monitor? - Answers extreme electrolyte imbalances such as
hypokalemia, hyperkalemia, disturbances with myocardial oxygen supply, other cardiac
disorders such as pericarditis, ventricular aneurysm
What is an interval on ECG strip? - Answers measure of time it takes for the impulse to travel
from one wave to the next - PR, QRS, QT
, What is the PR interval? - Answers time it takes electrical impulse to depolarize atria and travel
to ventricles, beginning at P wave and ending at QRS complex
What is the QRS interval? - Answers time to depolarize ventricles, measured from QRS complex
leaves baseline to when it returns
What is the length of the QRS interval? - Answers 0.06-0.1
What is the QT interval? - Answers measure of time it takes ventricles to depolarize and
repolarize, starts where QRS leaves baseline to where T returns to baseline, heart rate
dependent
What is the length of the QT interval? - Answers usually less than 0.52 seconds
What are the different steps in ECG interpretation? - Answers is the rate fast/slow/normal? Is
the rhythm regular? Are complexes equal distance? Are P waves present? Are QRS complexes
present? Are T waves present? Are intervals within normal limits? Are there P waves before
every QRS? Is there QRS after every P?
How do you calculate heart rate from ECG strip? - Answers Count number of QRS complexes
that fall within 6 second strip and multiply by 10, count number are R waves and divide into
1500
What is sinus bradycardia? - Answers regular rhythm with rate less than 60 bpm, can be normal
for athletes, can occur during sleep
What are some causes of sinus bradycardia? - Answers hypoxia, hypothermia
What are symptoms of sinus bradycardia that would require treatment? - Answers syncope,
chest pain, hypotension, SOB, diaphoresis
What is the treatment for sinus bradycardia? - Answers atropine 1 mg IV push, use of
pacemaker if not sufficient
What is sinus tachycardia? - Answers regular rhythm with rate greater than 100 bpm
What are some causes of sinus tachycardia? - Answers fever, anemia, hypovolemia,
hypotension, PE, myocardial infarction
What is the treatment for sinus tachycardia? - Answers based on symptoms - anemia may
require RBCs & IV fluid, medications such as beta blockers or calcium channel blockers control
or reduce HR
What are PACs? - Answers Premature atrial contractions - non life threatening dysrhythmia seen
in NSR
What are the causes of PACs - Answers hypoxia, excessive stimulant ingestion, coronary artery
