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		Overview of Abnormal Heart Rhythms

A chest x-ray shows the presence of a pacemaker under the skin. The wire attached to the pacemaker travels through blood vessels into the heart. A normal chest x-ray is shown on the right for comparison; the heart (H), lungs (L), vertebrae (v), and collarbone (C) can be seen.

(Left: RW Alexander, Hurst's The Heart, 9 ed, 1998, McGraw-Hill, Fig. 34-16; right: MY Chen, Basic Radiology, 1996, McGraw-Hill, Fig. 4-1b; with permission.)