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Study with Quizlet and memorize flashcards containing terms like Polarized (highlighted on EKG), Polarized (definition), Depolarization (definition) and more.
On an EKG, what does a P wave represent? it represents atrial depolarization. It happens when the SA node creates an action potential that depolarizes the atria. What part of the cardiac conduction system is responsible for ventricular depolarization? The Purkinje fibers.
Study with Quizlet and memorize flashcards containing terms like In an ECG, where does the depolarization of the atria occur?, What does the electrocardiogram (ECG) QRS wave indicate is happening in the heart?, What is an electrocardiogram and more.
Depolarization: An electrical shift that takes place within muscle cells, causing the muscle to reach action potential and ultimately contract. The electrical shift is measurable via the EKG, and allows the clinician to visually predict what the heart is doing and in what pattern.
The first vector originates from atrial depolarization. The depolarization starts in the sinoatrial node, from where it spreads through the right atrium and subsequently to the left atrium. During activation of the right atrium, the vector is directed anteriorly and to the left (and downwards).
In order to understand how the PQRST waveform is created on the ECG, you have to understand these two terms. Depolarization and repolarization are words that can be used to describe how a heart cell is responding to the electrical conduction system of the heart.
The P-wave reflects atrial depolarization (activation). The PR interval is the distance between the onset of the P-wave to the onset of the QRS complex. The PR interval is assessed in order to determine whether impulse conduction from the atria to the ventricles is normal.
