New pope's single lung unlikely to affect ability to carry out duties

And Francis will have to do it all with just one lung.

The Argentine pontiff lost the greater part of one lung to a teenage infection. “He feels it today,” says his authorized biographer Sergio Rubin. “He's a little bit slowed by it, but he's OK.”

Doctors said that losing one lung doesn't necessarily compromise the pope's health or reduce his life span, though it means no strenuous exercise since he no longer has as much air capacity as people with two lungs. “He probably wouldn't be able to run marathons, but I don't think that would be on his schedule,” said Dr. Peter Openshaw, director of the Centre for Respiratory Infection at Imperial College London. “Having one lung should be enough as long as there is no other disease in that lung.”

Openshaw didn't think a papal schedule would be too taxing for Francis' one lung, though he noted the pope's rib cage might look slightly unusual. “His X-ray will probably look rather alarming, but understandable once you know he only has one lung,” he said.

Openshaw said Francis' existing lung would probably have expanded to fill the space left by the missing one, and that his rib cage would have shrunk slightly in size. His diaphragm may also have moved up slightly higher than normal. But none of those changes should affect Francis' normal activities, he said.

He said the pope's remaining lung should be able to compensate for the missing one, similar to how parts of the brain may pick up functions of other regions damaged by a stroke.

“The other lung can gain capacity but there will be limits,” he said, comparing it to a car engine that now runs slightly slower. “You may not be able to accelerate as hard but it still works just as well.”

Experts said it would be rare nowadays to remove a lung. Antibiotics would be used to treat most lung infections including tuberculosis, though part of the organ might be removed to treat advanced lung cancer.

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