MCA 3 EXAM 1 PRACTICE QUESTIONS AND ANSWERS
P wave normal value? - CORRECT ANSWER✅✅0.11 sec
PR interval normal value? - CORRECT ANSWER✅✅0.12-0.20 sec
ST segment should be? - CORRECT ANSWER✅✅Isoelectric (flat)
QRS normal value? - CORRECT ANSWER✅✅0.06-0.10 sec
QT interval normal value - CORRECT ANSWER✅✅O.33-0.43 sec
each tiny EKG box is how many seconds? - CORRECT ANSWER✅✅0.04 seconds
each big box is how many seconds? - CORRECT ANSWER✅✅0.2 seconds
How to calculate heart rate from a 6 second EKG strip? - CORRECT ANSWER✅✅# of R waves x 10
What causes a peaked T wave? - CORRECT ANSWER✅✅Hyperkalemia
What is the order of Drugs to treat Hyperkalemia? - CORRECT ANSWER✅✅1. Insulin (Regular IV) plus
Dextrose (Insulin shifts potassium into cells)
2. Calcium gluconate (prevents K+ from leaving blood stream) 3. Albuterol (beta agonist; receptors in
Pancreas increase Insulin production)
4. Sodium Bicarbonate (to raise blood pH and shift extracellular potassium into cells)
5. Kayexalate/ Sodium Polystyrene (laxative, less K+ absorption)
Assessment of Cardiac Rhythm steps? - CORRECT ANSWER✅✅1. P wave present? Up or inverted? 1 for
every QRS or more? Any Atrial Flutter or Atrial Fibrillation waves present?
2. Atrial rhythm regular or irregular
,3. Calculate atrial rate
4. Measure PR interval. Normal or prolonged?
5. Evaluate ventricular rhythm. Regular or irregular
6. Calculate ventricular rate
7. Measure duration of QRS complex. Normal or prolonged?
8. Assess the ST segment. Flat? elevated? depressed?
9. Measure QT interval. Normal or depressed?
10. Note T wave. Upright or inverted?
Treatment for Bradycardia? - CORRECT ANSWER✅✅IV Atropine
Dopamine
Epinephrine
Pacemaker
Dosing of Atropine? - CORRECT ANSWER✅✅0.5 mg per dose, every 3 to 5 mins; Max 3mg
Symptomatic Bradycardia symptoms? - CORRECT ANSWER✅✅Pale skin, hypotension, weakness, chest
pain, dizziness, syncope, SOB, confusion
Treatments for Sinus Tachycardia? - CORRECT ANSWER✅✅Treat Underlying Cause
IVF
Beta-Blockers
Calcium Channel blockers (ex: Diltiazem)
Synchronized cardioversion
Rate for SVT? - CORRECT ANSWER✅✅151-220 bpm
Treatments for SVT? - CORRECT ANSWER✅✅Vagal maneuvers (such as baring down)
, IV Adenosine
Synchronized cardioversion
Adenosine Dosing? - CORRECT ANSWER✅✅1st dose: 6 mg
2nd dose: 12 mg
Why is Adenosine pushed antecubital?
How does it work?
Contraindication? - CORRECT ANSWER✅✅Because it has <10 sec half life, so it needs to reach the heart
quickly
Temporarily stops the heart, blocks the AV node, so rhythm can restart/reset *Have full team, and crash
cart available
Hemodynamically unstable (low BP)
Rhythm caused by early electrical impulse in atria that causes premature contraction? - CORRECT
ANSWER✅✅Premature Atrial Contraction
Treatment for Premature Atrial Contraction? - CORRECT ANSWER✅✅*Usually no treatment because
asymptomatic
Avoid excessive caffeine and alcohol intake
Decrease stress
Beta Blockers if HR > 100.
Atrial Flutter hallmark sign? - CORRECT ANSWER✅✅Saw tooth pattern
Atrial Flutter:
P wave normal value? - CORRECT ANSWER✅✅0.11 sec
PR interval normal value? - CORRECT ANSWER✅✅0.12-0.20 sec
ST segment should be? - CORRECT ANSWER✅✅Isoelectric (flat)
QRS normal value? - CORRECT ANSWER✅✅0.06-0.10 sec
QT interval normal value - CORRECT ANSWER✅✅O.33-0.43 sec
each tiny EKG box is how many seconds? - CORRECT ANSWER✅✅0.04 seconds
each big box is how many seconds? - CORRECT ANSWER✅✅0.2 seconds
How to calculate heart rate from a 6 second EKG strip? - CORRECT ANSWER✅✅# of R waves x 10
What causes a peaked T wave? - CORRECT ANSWER✅✅Hyperkalemia
What is the order of Drugs to treat Hyperkalemia? - CORRECT ANSWER✅✅1. Insulin (Regular IV) plus
Dextrose (Insulin shifts potassium into cells)
2. Calcium gluconate (prevents K+ from leaving blood stream) 3. Albuterol (beta agonist; receptors in
Pancreas increase Insulin production)
4. Sodium Bicarbonate (to raise blood pH and shift extracellular potassium into cells)
5. Kayexalate/ Sodium Polystyrene (laxative, less K+ absorption)
Assessment of Cardiac Rhythm steps? - CORRECT ANSWER✅✅1. P wave present? Up or inverted? 1 for
every QRS or more? Any Atrial Flutter or Atrial Fibrillation waves present?
2. Atrial rhythm regular or irregular
,3. Calculate atrial rate
4. Measure PR interval. Normal or prolonged?
5. Evaluate ventricular rhythm. Regular or irregular
6. Calculate ventricular rate
7. Measure duration of QRS complex. Normal or prolonged?
8. Assess the ST segment. Flat? elevated? depressed?
9. Measure QT interval. Normal or depressed?
10. Note T wave. Upright or inverted?
Treatment for Bradycardia? - CORRECT ANSWER✅✅IV Atropine
Dopamine
Epinephrine
Pacemaker
Dosing of Atropine? - CORRECT ANSWER✅✅0.5 mg per dose, every 3 to 5 mins; Max 3mg
Symptomatic Bradycardia symptoms? - CORRECT ANSWER✅✅Pale skin, hypotension, weakness, chest
pain, dizziness, syncope, SOB, confusion
Treatments for Sinus Tachycardia? - CORRECT ANSWER✅✅Treat Underlying Cause
IVF
Beta-Blockers
Calcium Channel blockers (ex: Diltiazem)
Synchronized cardioversion
Rate for SVT? - CORRECT ANSWER✅✅151-220 bpm
Treatments for SVT? - CORRECT ANSWER✅✅Vagal maneuvers (such as baring down)
, IV Adenosine
Synchronized cardioversion
Adenosine Dosing? - CORRECT ANSWER✅✅1st dose: 6 mg
2nd dose: 12 mg
Why is Adenosine pushed antecubital?
How does it work?
Contraindication? - CORRECT ANSWER✅✅Because it has <10 sec half life, so it needs to reach the heart
quickly
Temporarily stops the heart, blocks the AV node, so rhythm can restart/reset *Have full team, and crash
cart available
Hemodynamically unstable (low BP)
Rhythm caused by early electrical impulse in atria that causes premature contraction? - CORRECT
ANSWER✅✅Premature Atrial Contraction
Treatment for Premature Atrial Contraction? - CORRECT ANSWER✅✅*Usually no treatment because
asymptomatic
Avoid excessive caffeine and alcohol intake
Decrease stress
Beta Blockers if HR > 100.
Atrial Flutter hallmark sign? - CORRECT ANSWER✅✅Saw tooth pattern
Atrial Flutter:
