ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Coloured X-ray (front view) of the chest of an 80 year old patient, showing a pacemaker fitted to treat heart failure (cardiac insufficiency). The diseased heart is enlarged (cardiomegaly) due to left ventricular hypertrophy. The pacemaker is treating heart rhythm disorders by electrode stimulation.
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