#1
What is the term for an abnormally fast heart rate, typically exceeding 100 beats per minute?
#2
What is the primary pacemaker of the heart, responsible for initiating electrical impulses?
#3
What is the primary role of the atrioventricular (AV) node in the cardiac conduction system?
#4
Which term describes the condition where the heart is unable to pump blood effectively, leading to inadequate tissue perfusion?
#5
In the context of cardiac physiology, what is the term for the relaxation phase of the cardiac cycle when the heart chambers fill with blood?
#6
Which ion plays a crucial role in the depolarization phase of cardiac action potential?
#7
Which ECG wave represents the depolarization of the atria?
#8
Which electrolyte imbalance can lead to the development of torsades de pointes, a type of ventricular tachycardia?
#9
In a 12-lead ECG, which leads are considered precordial leads?
#10
Which condition is characterized by a rapid, irregular heartbeat often originating from the atria?
#11
What is the primary cause of ventricular fibrillation, a life-threatening cardiac arrhythmia?
#12
Which class of antiarrhythmic drugs primarily blocks sodium channels and is effective in treating ventricular arrhythmias?
#13
What is the term for a temporary cessation of cardiac electrical activity, often reversible with prompt intervention?
#14
Which antiarrhythmic drug class prolongs the cardiac action potential duration by blocking potassium channels?
#15