The Facts in the Case of M. Valdemar
Poe was inspired to write Valdemar after reading a letter about an operation on a mesmerized patient. The tale was published in December 1845 in two different New York journals. One used the title "The Facts in M. Valdemar's Case". In England, the tale was published first as "Mesmerism in Articulo Mortis" and later as "The Last Days of M. Valdemar".