Federal health regulators say an experimental catheter from Medtronic Inc. that uses extreme heat to correct irregular heartbeats caused safety side effects in nearly one-fifth of patients treated, far exceeding the study's safety goal.
In 1970, Dr. William Ganz and Dr. H.J.C. Swan invented a balloon-tipped catheter which measures heart function and blood flow in critically ill patients. The Swan-Ganz Catheter is still used by physicians across the world.
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