Four patients undergoing routine joint replacement surgeries at Ascension Saint Thomas Hospital Midtown in Nashville allegedly received the wrong medication through spinal injections. At least one woman was left paralyzed, according to her family, while the other patients reportedly experienced serious complications.

The hospital acknowledged Friday that a medication error occurred in its pharmacy, according to multiple reports. The error resulted in patients receiving potassium phosphate rather than a regular anesthetic and experiencing what the hospital described as “adverse health reactions.”

The Tennessee Bureau of Investigation is now examining the incident. The agency confirmed to Fox News Digital on Saturday that it began investigating after receiving information Friday from the Tennessee Healthcare Facilities Commission.

Kristina Dorton told WKRN TV that her mother in law was among the patients affected. Although the joint replacement itself was successful, Dorton said the medication mixup caused devastating harm elsewhere.

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“The joint replacement went wonderful. Her knee is great. The rest of her is not,” Dorton said. She said her mother in law has no feeling from her breastbone down.

Dorton also described what the family had been told about the medications involved. “It was supposed to be the anesthetic. It was supposed to be bupivacaine, and it was potassium, and we don’t know what quantity.”

Uncertainty now surrounds what could come next for the patient and her family. Dorton said they do not know whether the paralysis will improve or what any potential recovery could involve.

“We don’t know what recovery looks like or if there is recovery,” she said. Meanwhile, the other three patients reportedly suffered serious complications connected to the same pharmacy error.

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CBS News reported that a second patient is paralyzed. The source article did not provide further details about that patient or describe the specific conditions of the remaining two patients.

Dr. Shubhada Jagasia, president and CEO of Ascension Saint Thomas Hospital Midtown, released a statement earlier in the week, according to WSMV. She apologized for the harm and said the hospital was supporting all four patients and their families.

“Our hearts are with the four patients and their families impacted by this event,” Jagasia said. “On behalf of our leadership and care teams, I am deeply sorry for the harm caused to our patients.”

Jagasia said hospital representatives had met directly with each family to express their support. She also said the families had been connected with spiritual care teams and given access to appropriate resources and continuing care.

The hospital reported the incident to state regulators on the same day it occurred, according to Jagasia. It also launched an investigation, identified the cause and implemented corrective safeguards.

Jagasia said providing safe, quality care is central to the hospital’s work and that any failure to meet that standard receives immediate attention. She added that clinical teams are actively using enhanced safety protocols intended to ensure the highest level of safety at Midtown.

However, Dorton told WKRN TV that the treatment intended to help her mother in law recover was not working. She described the consequences as life altering and catastrophic, saying the family hopes someone will know how to help.

The family remains focused on finding assistance while the investigation proceeds. “Time is of the essence here for recovery,” Dorton said.

All four patients were being cared for following the medication error, according to the hospital’s CEO. Fox News Digital has reached out to Ascension Saint Thomas Hospital Midtown for additional comment.