Here's the thing though, doctors have a long storied background of not knowing what the hell they're doing. History is filled with stories of hilarious medical ineptitude, and in all likeliness, today's medical practices will be similarly snorted at 100 years down the road.
Empty definition, containing nothing; having none of the usual or appropriate contents: an empty bottle. See more.
Meaning empty space (in a document, etc.) is from c.1570. Meaning losing lottery ticket (1560s) is behind the expression draw a blank. The word has been for decorum's sake, substituted for a word of execration [OED] from 1854. From 1896 as short for blank cartridge (itself from 1826).