Multiple patients reportedly suffered cardiac arrest following the medication error. Two patients were left paralyzed, while another required a ventilator, according to reports surrounding the incident.
Now, the Tennessee Bureau of Investigation has become involved as authorities examine how such a serious mistake could have occurred inside the hospital.
Potassium plays a critical role in the human body, but administering excessive amounts directly into the bloodstream — particularly too rapidly — can have catastrophic consequences. Large or improperly administered doses can disrupt the electrical activity of the heart and potentially trigger cardiac arrest.
According to the hospital, the mistake originated inside its own pharmacy.
The four patients were preparing for joint replacement procedures and were supposed to receive mepivacaine, a local anesthetic commonly used to block pain during medical procedures.
Instead, they received potassium phosphate.
Ascension Saint Thomas acknowledged the error and apologized to the patients and their families.
“Our hearts remain entirely with the four patients and families impacted by the recent event at Ascension Saint Thomas Hospital Midtown,” the hospital said. “On behalf of our leadership and care teams, we extend our deepest apologies for the harm caused.”
The hospital said all four patients experienced medical complications after receiving the incorrect drug and that staff immediately intervened.
“The four patients experienced adverse health reactions and received immediate medical care,” the hospital said.
Ascension Saint Thomas subsequently launched what it described as a comprehensive review of the incident. Hospital officials said their investigation determined that no additional patients had received the incorrect medication.
But for the four people caught in the mix-up, the consequences were anything but routine.
One of those patients was reportedly 72-year-old Glenda Dorton.
According to her family, Dorton entered Saint Thomas Midtown on Aug. 14 expecting what should have been a routine knee replacement procedure. Instead, she became one of the four patients affected by the medication mistake.
The revelation raises serious questions about the safeguards surrounding medication preparation and distribution inside hospitals, particularly when two drugs with radically different purposes can apparently be confused before reaching patients.
A medication intended to provide anesthesia was replaced with a potassium compound capable of causing severe complications when improperly administered.
The fact that four patients were reportedly affected also puts additional scrutiny on how the medication was prepared, labeled, checked and ultimately delivered to the surgical setting.
Hospital pharmacies generally rely on multiple safeguards precisely because medication mistakes can become life-threatening within seconds. In this case, however, something went terribly wrong before the drug reached the patients.
The Tennessee Bureau of Investigation’s involvement adds another layer of scrutiny to the episode as officials work to determine exactly what happened and whether additional action is warranted.
For the families involved, however, the investigation comes after their loved ones have already endured potentially life-altering consequences.
Ascension Saint Thomas has emphasized that its review found the mistake was limited to the four patients and said it remains focused on those affected.
Still, the incident is likely to generate difficult questions for hospital leadership about accountability and patient safety.
How did potassium phosphate end up where an anesthetic was supposed to be? What safeguards failed to catch the mistake before the medication reached four separate patients? And, perhaps most importantly, what changes will be made to prevent anything like this from happening again?
Those questions become especially urgent given the reported severity of the patients’ reactions.
Four people walked into a Nashville hospital expecting joint replacement procedures.
Instead, an apparent pharmacy error transformed ordinary surgeries into a medical emergency — leaving patients and their families dealing with consequences they never could have expected when they arrived at the hospital that day.
