1 / 36

Chapter 17 Interpreting the Electrocardiogram

2. Objectives. Describe the value and limitations of the electrocardiogram (ECG).Describe the electrophysiology of cardiac cells.Describe how the cardiac impulse is conducted through the different structures of the heart. Recognize various abnormal ECG recordings.. 3. The Electrocardio

thy
Download Presentation

Chapter 17 Interpreting the Electrocardiogram

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. Chapter 17 Interpreting the Electrocardiogram

    2. 2 Objectives • Describe the value and limitations of the electrocardiogram (ECG). • Describe the electrophysiology of cardiac cells. • Describe how the cardiac impulse is conducted through the different structures of the heart. • Recognize various abnormal ECG recordings.

    3. 3 The Electrocardiogram An ECG is a popular tool because it is inexpensive, noninvasive, and easy to obtain. Often used to assess the patient suspected of having an acute myocardial infarction. Also used as a health screening tool in patients over age 40 years. It cannot predict future heart attacks or detect structural defects (e.g., valve stenosis).

    4. 4 Electrophysiology Normally, cardiac cells are polarized with a positive charge on the outside. When stimulated, cardiac cells depolarize as sodium rushes inside the cells. Depolarization causes the muscle cells to contract momentarily. Repolarization reestablishes the electrical imbalance across the cell membrane.

    5. 5 Electrophysiology (cont.) Three different types of cardiac cells are present in the heart Pacemaker cells (e.g., sinoatrial node) Specialized rapidly conducting tissue (e.g., Purkinje fibers) Atrial and ventricular muscle cells All these cells have the ability to spontaneously depolarize (automaticity).

    6. 6 Electrophysiology (cont.)

More Related