CCRN Exam 2025 Questions and
Answers
Inferior leads - ANSWER-II, III, aVF
What leads correlate to the right side of the heart and usually the RCA -
ANSWER-II, III, aVF
anterior or septal leads: - ANSWER-VI, VII, VIII
Class I antiarrhythmic drugs - ANSWER-Class I antidysrhythmics block the
movement of sodium during phase 0 of the action potential (i.e., depolarization)
Class II antiarrhythmic drugs - ANSWER-Class II antidysrhythmics block β
receptors and so affect automaticity
Class III antiarrhythmics - ANSWER-Class III antidysrhythmics block the
movement of potassium during phase 3 of the action potential (i.e., late
repolarization).
Class IV antiarrhythmics - ANSWER-Class IV antidysrhythmics block the
movement of calcium during phase 2 of the action potential (i.e., early
repolarization).
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, What does demeclocycline do with SIADH - ANSWER-Demeclocycline blocks
the action of ADH or this ADH-like substance on the renal tubes, allowing
diuresis to occur.
What is Ibutilide used for? - ANSWER-Ibutilide is used to convert acute-onset
atrial fibrillation to NSR.
common Class I antiarrhythmics (FAST- Na channel blocker) - ANSWER-Sodium
Channel Blockers:
IA: Disopyramide, Quinidine, Procainamide (Prlong repolarization)
"Double Quarter Pounder"
IB: Phenytoin, Lidocaine, Mexiletine
"Please, Lettuce, Mayo" (shorten repolarization)
IC: Fecainide, Propafenone, moricizine
"More Fries Please" (no effect on repolarization)
common Class II antidysrhythmics (Beta Blocker) - ANSWER-Propanolol
(Inderal) - oral/IV
atenolol, esmolol, and metoprolol.
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Answers
Inferior leads - ANSWER-II, III, aVF
What leads correlate to the right side of the heart and usually the RCA -
ANSWER-II, III, aVF
anterior or septal leads: - ANSWER-VI, VII, VIII
Class I antiarrhythmic drugs - ANSWER-Class I antidysrhythmics block the
movement of sodium during phase 0 of the action potential (i.e., depolarization)
Class II antiarrhythmic drugs - ANSWER-Class II antidysrhythmics block β
receptors and so affect automaticity
Class III antiarrhythmics - ANSWER-Class III antidysrhythmics block the
movement of potassium during phase 3 of the action potential (i.e., late
repolarization).
Class IV antiarrhythmics - ANSWER-Class IV antidysrhythmics block the
movement of calcium during phase 2 of the action potential (i.e., early
repolarization).
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
, What does demeclocycline do with SIADH - ANSWER-Demeclocycline blocks
the action of ADH or this ADH-like substance on the renal tubes, allowing
diuresis to occur.
What is Ibutilide used for? - ANSWER-Ibutilide is used to convert acute-onset
atrial fibrillation to NSR.
common Class I antiarrhythmics (FAST- Na channel blocker) - ANSWER-Sodium
Channel Blockers:
IA: Disopyramide, Quinidine, Procainamide (Prlong repolarization)
"Double Quarter Pounder"
IB: Phenytoin, Lidocaine, Mexiletine
"Please, Lettuce, Mayo" (shorten repolarization)
IC: Fecainide, Propafenone, moricizine
"More Fries Please" (no effect on repolarization)
common Class II antidysrhythmics (Beta Blocker) - ANSWER-Propanolol
(Inderal) - oral/IV
atenolol, esmolol, and metoprolol.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
