In this lesson, we’ll continue exploring conduction delays by focusing on bundle branch blocks. We’ll break down the differences between right bundle branch blocks (RBBB) and left bundle branch blocks (LBBB), how they affect the heart’s electrical conduction, and what they look like on an EKG. By the end, you’ll understand how to identify these patterns, what they mean for cardiac function, and why bundle branch blocks are important to recognize in clinical practice.
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Video Timestamps:
00:04 Understanding the layers of the heart and special cells for efficient blood pumping.
00:47 The heart adjusts oxygen demand during physical activity.
01:32 Layers of the Heart
02:20 Myocardium can grow and suffer infarction due to lack of oxygen
03:06 The epicardium is an outer layer containing fat and blood vessels that attaches to the myocardium.
03:52 Parietal pericardium holds heart in place
04:38 The paracardial sac reduces friction for the heart’s movement.
05:26 Layers of the heart comprise endocardium, myocardium, and epicardium.