Undisputed Pundit

What does the term "sinus rhythm" refer to? • A) A regular heartbeat initiated by the AV node • B) A regular heartbeat initiated by the SA node • C) An irregular heartbeat with varying intervals • Answer: B) A regular heartbeat initiated by the SA node • Explanation: Sinus rhythm is characterized by a regular heartbeat that originates from the sinoatrial (SA) node, indicating normal electrical activity.

Which structure in the heart is primarily responsible for coordinating atrial contraction? • A) Sinoatrial node • B) Atrioventricular node • C) Bundle of His • Answer: A) Sinoatrial node • Explanation: The sinoatrial (SA) node is the primary pacemaker of the heart and initiates electrical impulses, leading to atrial contraction.

What is the primary purpose of an electrophysiology study (EPS)? • A) To assess heart rate variability • B) To evaluate electrical conduction pathways and arrhythmias • C) To measure cardiac output • Answer: B) To evaluate electrical conduction pathways and arrhythmias • Explanation: EPS is used to map the electrical conduction system of the heart and identify specific arrhythmias for treatment planning.

What is the most likely consequence of prolonged QT interval on an ECG? • A) Atrial flutter • B) Torsades de Pointes • C) Sinus bradycardia • Answer: B) Torsades de Pointes • Explanation: A prolonged QT interval predisposes patients to Torsades de Pointes, a type of polymorphic ventricular tachycardia.

What is the primary role of the SA node in cardiac function? • A) Initiates electrical impulses for heartbeat • B) Slows down heart rate • C) Regulates blood pressure • Answer: A) Initiates electrical impulses for heartbeat • Explanation: The SA node acts as the heart's natural pacemaker, initiating the impulse that begins each heartbeat.

Which of the following arrhythmias is typically treated with anti-tachycardia pacing (ATP) by an ICD? • A) Atrial fibrillation • B) Ventricular tachycardia • C) Sinus tachycardia • Answer: B) Ventricular tachycardia • Explanation: Anti-tachycardia pacing (ATP) is commonly used to terminate ventricular tachycardia by delivering rapid, controlled pacing impulses.

What is the primary purpose of biventricular pacing in CRT? • A) To increase atrial contraction • B) To synchronize left and right ventricular contraction • C) To improve AV node conduction • Answer: B) To synchronize left and right ventricular contraction • Explanation: Biventricular pacing improves the timing between left and right ventricular contractions, which can enhance cardiac output in heart failure patients.

USMC CFT Exam 2024 with correct Answers , USMC Combat Fitness Test (CFT) Level 1,2,3,4 and 5 Assessments.

1. What is the proper procedure for altitude acclimation before CFT? a) 24 hours b) 48 hours c) 72 hours Correct Answer: b) 48 hours Reason: Marines require 48 hours minimum to acclimate to significant altitude changes before testing.

1. What is the minimum visibility requirement for conducting a CFT? a) 50 meters b) 100 meters c) 150 meters Correct Answer: b) 100 meters Reason: 100 meters visibility is required to ensure safety and proper observation of all events.