Paul Alexander, polio survivor who lived in iron lung for 70 years, dies age 78

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Paul Alexander was one of the last people to use an iron lung, having been left unable to breathe on his own after catching polio in the 1950s.

Paul Alexander, polio survivor who lived in iron lung for 70 years, dies age 78 : Read more

 

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So why would Mr Alexander (or anyone else) still be in an iron lung instead of using a modern ventilator?