Who is legally permitted to make significant medical decisions for a spouse is explained in the Las Vegas Review-Journal, "With open divorce case, Khloe Kardashian could be making Lamar Odom's medical decisions."
Nevada law spells out who will make medical decisions for patients who become incapacitated, which are sometimes called substituted judgment statutes. In the Silver State, spouses or registered domestic partners are first in line. If Odom does not have advanced directives, legal documents stating his health care choices, Khloe would be the one to make these decisions.
There are several types of advanced directives, including living wills and medical powers of attorney. These estate planning documents let individuals make their wishes known to family, friends, and health care professionals to avoid confusion in cases like Odom's.
Odom may have an advanced directive which would apply. By signing an advanced directive, you select the individual you want making your decisions for you.
The Nye County Sheriff's Office stated that Odom had been using cocaine and sexual performance enhancers in the days prior to being discovered unconscious at Love Ranch brothel in Crystal, about 90 minutes outside of Las Vegas. (Nevada is the only state with legalized prostitution, and county regulations say that business licenses can be revoked if brothels have drug issues).
In addition to his 2009 and 2010 NBA Championships with the LA Lakers, Odom is known for being part of the Kardashian family. Khloe filed for divorce in 2013 after four years of marriage.
Reference: Las Vegas Review-Journal (October 18, 2015) “With open divorce case, Khloe Kardashian could be making Lamar Odom's medical decisions”