Werner Forssmann

In 1929, Werner Forssmann inserted a catheter into a vein in his own forearm and advanced it approximately 60 centimeters until it reached his right atrium, then walked to an X-ray room with the catheter still in place to photographically confirm its position in his heart. This daring self-experiment proved that a catheter could be safely guided into the human heart.

Yes, Werner Forssmann was awarded the Nobel Prize in Physiology or Medicine in 1956, shared with André Frédéric Cournand and Dickinson W. Richards. The prize recognized their collective work in developing cardiac catheterization, though Forssmann's original 1929 self-experiment had been largely ignored—and even condemned—by the medical establishment for nearly three decades.

Forssmann's supervisor at the hospital in Eberswalde strongly opposed the experiment, and when Forssmann proceeded anyway—by deceiving a colleague into handing him the catheter—he was initially viewed as reckless rather than pioneering. The medical establishment considered self-experimentation of this nature to be dangerous and ethically dubious, and the lack of immediate clinical application meant his work was largely dismissed in Germany.

Forssmann's demonstration paved the way for modern diagnostic and interventional cardiology, including coronary angiography, balloon angioplasty, and cardiac stent placement. The technique was later refined and clinically validated by Cournand and Richards at Bellevue Hospital in New York, transforming cardiac catheterization into one of the most important diagnostic and therapeutic tools in cardiovascular medicine.