Paramedic Cardiology Practice Exam

The type of electrical activity characterized by a rate of 60-100 beats per minute is known as sinus rhythm. This rhythm originates from the sinoatrial (SA) node, which is the natural pacemaker of the heart. A sinus rhythm implies that the heart is beating in a regular pattern at an ideal rate for normal physiological function, allowing for adequate blood flow and oxygenation of tissues.

In a sinus rhythm, each heartbeat is triggered by an electrical impulse that travels through the heart in a coordinated manner. This leads to effective contraction of the atria and ventricles. The rate being between 60 and 100 bpm is considered normal for adults at rest, indicating a well-functioning cardiovascular system.

Other conditions, such as atrial fibrillation, ventricular tachycardia, and sinus bradycardia, present with different heart rates or rhythms. Atrial fibrillation typically shows an irregular and often rapid heart rate, while ventricular tachycardia is characterized by a rapid heartbeat that can be life-threatening. Sinus bradycardia occurs when the heart rate drops below 60 bpm. Understanding these various rhythms and their characteristics is essential for recognizing abnormalities and managing patient care effectively.