That's the analysis of Dr. Massimo Napolitano of the Hackensack University Medical Center in New Jersey.
Napolitano should know - the chief of vascular surgery is advising Blaine on the stunt.
Napolitano says hanging upside down for an extended time increases pressure in the veins in your head, especially in your eyes. That could lead to blindness.
There's also a risk of swelling and cramps in Blaine's internal organs.
Nevertheless, Napolitano says the stunt could yield some valuable physiological data for doctors.
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