IBHRE Exam UPDATED ACTUAL
Questions and CORRECT Answers
ICD Battery Types - CORRECT ANSWER - 1. Li/SVO: Lithium/Silver-Vanadium Oxide
(1st gen.)
2. Lithium/Manganese Dioxide (2 manufacturers)
3. Lithium/Silver-Vanadium Oxide-Carbon Monofluoride (2 manufacturers -MDT)
Capacitor Types - CORRECT ANSWER - -Aluminum Electrolytic
-Tantalum
5 Phases of Cardiac Action Potential - CORRECT ANSWER - *Phase 0: influx of Na+
(depolarization - conduction velocity)
*Phase 1: transient efflux of K+ (how quickly the cell can be depolarized again)
*Phase 2: influx of Ca 2+ & Na+ (")
*Phase 3: efflux of K+ > influx of Ca2+ & Na+ (")
*Phase 4: Na+ -K+ pump (resting phase, ion leakage determines when next spontaneous
depolarization will happen)
Excitable Periods of Cardiac Action Potential - CORRECT ANSWER - Phase 0, Phase 1,
Phase 2
Refractory Periods of Cardiac Action Potential - CORRECT ANSWER - Phase 3 & Phase
4
Drugs That Increase DFTs - CORRECT ANSWER - Lidocaine, Mexiletine, Flecainide,
Quinidine, Disopyramide, Moricizine, Propranolol, Verapamil, Amiodarone, Sildenafil Citrate
Drugs That Decrease DFTs - CORRECT ANSWER - Sotalol, Dofetilide, Ibutilide
, Drugs With Conflicting Data on DFTs - CORRECT ANSWER - Procainamide,
Propafenone, Bretylium
Drugs That Increase Pacing Thresholds - CORRECT ANSWER - Flecainide, Propafenone,
Encainide, Sotalol, Beta Blockers, Lidocaine, Verapamil, Procainamide
Drugs That Decrease Thresholds - CORRECT ANSWER - Atropine, Catecholamines,
Glucocoticoids
Drugs That Have No Proven Effect on Thresholds - CORRECT ANSWER - Amiodarone,
Anesthetic Drugs
Name of Class 1 Antiarrhythmic Drugs - CORRECT ANSWER - * 1a: disopyramide,
procainamide, quinidine
*1b: lidocaine, mexiletine
*1c: flecainide, propafenone
Class 1 Antiarrhythmic Drugs - CORRECT ANSWER - Sodium Channel Blockers
Name of Class II Antiarrhythmic Drugs - CORRECT ANSWER - metoprolol, atenolol
Class II Antiarrhythmic Drugs - CORRECT ANSWER - Beta-blockers
Name of Class III Antiarrhythmic Drugs - CORRECT ANSWER - amiodarone, sotalol,
ibutilide, dofetilide, dronedarone
Class II Antiarrhythmic Drugs - CORRECT ANSWER - Potassium Channel Blockers
Name of Class IV Antiarrhythmic Drugs - CORRECT ANSWER - verapamil, diltiazem
Questions and CORRECT Answers
ICD Battery Types - CORRECT ANSWER - 1. Li/SVO: Lithium/Silver-Vanadium Oxide
(1st gen.)
2. Lithium/Manganese Dioxide (2 manufacturers)
3. Lithium/Silver-Vanadium Oxide-Carbon Monofluoride (2 manufacturers -MDT)
Capacitor Types - CORRECT ANSWER - -Aluminum Electrolytic
-Tantalum
5 Phases of Cardiac Action Potential - CORRECT ANSWER - *Phase 0: influx of Na+
(depolarization - conduction velocity)
*Phase 1: transient efflux of K+ (how quickly the cell can be depolarized again)
*Phase 2: influx of Ca 2+ & Na+ (")
*Phase 3: efflux of K+ > influx of Ca2+ & Na+ (")
*Phase 4: Na+ -K+ pump (resting phase, ion leakage determines when next spontaneous
depolarization will happen)
Excitable Periods of Cardiac Action Potential - CORRECT ANSWER - Phase 0, Phase 1,
Phase 2
Refractory Periods of Cardiac Action Potential - CORRECT ANSWER - Phase 3 & Phase
4
Drugs That Increase DFTs - CORRECT ANSWER - Lidocaine, Mexiletine, Flecainide,
Quinidine, Disopyramide, Moricizine, Propranolol, Verapamil, Amiodarone, Sildenafil Citrate
Drugs That Decrease DFTs - CORRECT ANSWER - Sotalol, Dofetilide, Ibutilide
, Drugs With Conflicting Data on DFTs - CORRECT ANSWER - Procainamide,
Propafenone, Bretylium
Drugs That Increase Pacing Thresholds - CORRECT ANSWER - Flecainide, Propafenone,
Encainide, Sotalol, Beta Blockers, Lidocaine, Verapamil, Procainamide
Drugs That Decrease Thresholds - CORRECT ANSWER - Atropine, Catecholamines,
Glucocoticoids
Drugs That Have No Proven Effect on Thresholds - CORRECT ANSWER - Amiodarone,
Anesthetic Drugs
Name of Class 1 Antiarrhythmic Drugs - CORRECT ANSWER - * 1a: disopyramide,
procainamide, quinidine
*1b: lidocaine, mexiletine
*1c: flecainide, propafenone
Class 1 Antiarrhythmic Drugs - CORRECT ANSWER - Sodium Channel Blockers
Name of Class II Antiarrhythmic Drugs - CORRECT ANSWER - metoprolol, atenolol
Class II Antiarrhythmic Drugs - CORRECT ANSWER - Beta-blockers
Name of Class III Antiarrhythmic Drugs - CORRECT ANSWER - amiodarone, sotalol,
ibutilide, dofetilide, dronedarone
Class II Antiarrhythmic Drugs - CORRECT ANSWER - Potassium Channel Blockers
Name of Class IV Antiarrhythmic Drugs - CORRECT ANSWER - verapamil, diltiazem
