The miraculous survival of a disturbed man who leaped from the Brooklyn Bridge on Sunday could have come down to a handful of factors — the likeliest being the precise position of his body when he landed in the East River, an expert told The Post.

“Jumping or falling from extreme heights – such as a 270-foot bridge tower – is overwhelmingly fatal,” said Dr. David S. Shapiro, a trauma surgeon with more than 30 years of experience.

“It generates extreme kinetic energy that causes widespread, life-threatening trauma,” added Shapiro, who now works at New England Donor Services.

Incredibly, cops said the 44-year-old jumper, identified as Galymzhan…

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