Registered Sleep Technologist Practice Exam

The term used for a sinus rhythm that exceeds 90 beats per minute is sinus tachycardia. This condition indicates that the heart is beating faster than the normal resting rate, which is typically between 60 and 100 bpm. In the context of sinus tachycardia, the heart's natural pacemaker, the sinoatrial (SA) node, is firing at an accelerated rate, prompting the increased heart rate. Sinus tachycardia can occur for several reasons, including physical activity, stress, fever, or underlying medical conditions, and it is characterized by a regular rhythm, where the P waves and QRS complexes are properly aligned and identifiable on an electrocardiogram. Understanding this condition is crucial for sleep technologists, as it may have implications for sleep-disordered breathing or other cardiovascular issues during sleep studies.