The heart's invisible conductor controls your heartbeat
In short: This video explains how the heart's conduction system works, from the SA node to the Purkinje fibers, and how an ECG maps the electrical activity of the heart. It's essential for understanding heart rhythms and diagnosing arrhythmias.
The video breaks down the heart's conduction system, starting with the sinoatrial (SA) node, which acts as the natural pacemaker. Electrical impulses travel through the internodal and interatrial pathways, triggering atrial contraction. The signal then reaches the atrioventricular (AV) node, where it pauses briefly before passing through the bundle of His and its branches to the Purkinje fibers, initiating ventricular contraction.
An electrocardiogram (ECG) records this electrical activity, showing waves like the P wave (atrial depolarization), QRS complex (ventricular depolarization), and T wave (ventricular repolarization). The PR interval and ST segment provide critical information about the heart's electrical conduction and potential abnormalities, making ECGs vital for diagnosing conditions like arrhythmias and myocardial infarction.
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Sources
- Summary by Intellect · source: Heart Conduction System & ECG (EKG)
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