I am quite sure I read the localized version of the manga about 10 years ago, so the manga must have started serialization in Japan many years before that.
The manga started with the president being injected something into his hand, and fell into coma. All the doctors tried many types of drugs to no avail. The protagonist, who was a great doctor and surgeon, somehow came to operate on the president. It wa revealed that the president's pericardial cavity (the space between the double-walled sac containing the hear) was inhibited by a bunch of worm-like parasites, and he would die if the parasites were left to multiply, since it would obstruct the heart's beating. In the surgery, the protagonist had to stop the heart of the president and skillfully used a small clip to pick all the parasites, then restarted his heart. He also ordered to filter president's blood to remove all traces of the parasite in the blood stream.
Can anyone help me identify this manga?