#1
Which of the following ECG leads is commonly used to diagnose myocardial infarction?
Lead I
Lead II
Lead III
Lead V1
#2
What does the P wave represent in an ECG?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#3
What does the QRS complex represent in an ECG?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#4
What does the T wave represent in an ECG?
Atrial depolarization
Ventricular depolarization
Atrial repolarization
Ventricular repolarization
#5
What does the QT interval represent on an ECG?
Atrial depolarization to ventricular depolarization
Atrial depolarization to ventricular repolarization
Ventricular depolarization to ventricular repolarization
Atrial repolarization to ventricular repolarization
#6
Which of the following arrhythmias is characterized by an irregularly irregular rhythm?
Atrial fibrillation
Atrial flutter
Ventricular fibrillation
Sinus bradycardia
#7
What is the treatment of choice for ventricular tachycardia with a pulse?
Defibrillation
Cardioversion
Amiodarone
Adenosine
#8
Which of the following medications is known to prolong the QT interval on an ECG?
Amiodarone
Lidocaine
Digoxin
Atropine
#9
In which lead is the ST segment typically analyzed for ischemic changes?
Lead I
Lead II
Lead III
Lead V5
#10
Which arrhythmia is characterized by a regular rhythm with a 'sawtooth' pattern of atrial activity?
Atrial fibrillation
Atrial flutter
Ventricular tachycardia
Sinus tachycardia
#11
Which electrolyte imbalance is associated with a prolonged QT interval on an ECG?
Hypernatremia
Hypokalemia
Hypercalcemia
Hypomagnesemia
#12
Which of the following ECG findings is consistent with hyperkalemia?
Peaked T waves
Prolonged PR interval
Short QT interval
Widened QRS complex
#13
What is the characteristic ECG finding in ventricular fibrillation?
Absence of P waves and irregular QRS complexes
Sawtooth-shaped baseline with narrow QRS complexes
Regular rhythm with absent QRS complexes
Fine or coarse ventricular fibrillatory waves
#14
What is the most appropriate treatment for atrial fibrillation with rapid ventricular response in a hemodynamically unstable patient?
Amiodarone
Digoxin
Synchronized cardioversion
Beta-blockers
#15
What is the hallmark ECG finding in ventricular fibrillation?
Regular rhythm with narrow QRS complexes
Absence of P waves and irregular QRS complexes
Regular rhythm with absent QRS complexes
Fine or coarse ventricular fibrillatory waves