#1
Which of the following ions primarily contributes to the resting membrane potential of cardiac cells?
1 answered
#2
Which phase of the cardiac action potential represents rapid depolarization due to the opening of voltage-gated sodium channels?
1 answered
#3
Which ion plays a crucial role in the initiation and propagation of the action potential in cardiac pacemaker cells?
1 answered
#4
Which phase of the cardiac action potential represents rapid repolarization due to the opening of voltage-gated potassium channels and closing of voltage-gated sodium channels?
1 answered
#5
Which arrhythmia is characterized by chaotic, irregular electrical activity in the atria resulting in an irregular ventricular response?
#6
Which of the following ECG findings is indicative of a prolonged QT interval and an increased risk of ventricular arrhythmias?
#7
What is the typical heart rate range of a patient experiencing sinus tachycardia?
#8
Which arrhythmia is characterized by a widened QRS complex and irregular ventricular rhythm?
#9
What is the mechanism of action of class III antiarrhythmic drugs such as amiodarone?
1 answered
#10
Which of the following ECG findings is indicative of an accessory pathway between the atria and ventricles resulting in a short PR interval and a delta wave?
1 answered
#11
Which of the following ECG findings is indicative of a complete heart block where the atria and ventricles beat independently?
#12
What is the primary mechanism of action of class I antiarrhythmic drugs such as lidocaine?
1 answered