In the wake of the failed execution on Wednesday night of Christa Pike, a Tennessee woman convicted of murder, medical experts offered several theories that could explain why the two doses of a lethal drug administered to her proved not to be fatal.
The likeliest, they said, was that the drug, pentobarbital, poured into tissue surrounding the insertion site instead of entering her bloodstream.
That could have prevented the amount of the drug in her circulatory system from reaching the levels needed to stop her breathing. It may nevertheless have lowered her oxygen levels or weakened her circulation enough to cause brain damage.
Ms. Pike’s medical status is not clear. Her lawyers said late Wednesday that she was at a hospital but that they did not know her condition. It was also unclear what went wrong with the administration of the drug.
The Tennessee Department of Correction said in a statement that it “had followed every step of the state’s lawful, established execution protocol approved by the attorney general’s office.”
Medical experts said there were signals that an intravenous catheter, rather than directing the drug into the bloodstream, allowed it to leak into the tissue surrounding the insertion point — because of how or where the IV was inserted, because of the fragility of Ms. Pike’s veins or for another reason.
Such an outcome is known as “IV infiltration,” and has been cited in past botched executions. Medical experts said that experienced doctors would typically be able to recognize signs of an IV infiltration as it occurred.
Members of the news media who served as witnesses to the execution attempt said that Ms. Pike at one point described a burning spot in her arm that felt as if it were going to burst and asked if that was normal.
“The pain in her arm should have been a bright red flag that the IV was infiltrating,” said Dr. Mark Heath, an assistant professor of anesthesiology at Columbia University Irving Medical Center.
Dr. Joel Zivot, a professor of anesthesiology at the Emory University School of Medicine who said that he had previously been retained by Ms. Pike’s lawyers as a medical expert, said that such an event would have caused the type of reaction that witnesses described.
The result, he said, could have been a highly alkaline solution leaking into Ms. Pike’s arm. “Essentially, they’ve injected bleach into the tissue of her arm,” Dr. Zivot said.
He added that he was speaking on his own behalf and not for Ms. Pike’s legal team, and that he had no direct knowledge of what happened during the execution attempt.
Having examined Ms. Pike’s medical records before the execution attempt, Dr. Zivot said that she was also susceptible to an IV infiltration. Ms. Pike’s lawyers had previously argued that the procedure could be agonizing for her in part because she has small veins.
“Her venous system was small, and there could be some fragility there,” Dr. Zivot said. “You push a lot of a caustic substance into a small vein like that, under pressure, it’s going to blow.”
The lethal drug, pentobarbital, is a barbiturate that can treat seizures; it works by depressing activity in the nervous system. It is a mainstay drug for euthanizing animals. The drug has also been used in states with legal medical aid in dying.
Its main effect is to shut down electrical activity in the brain, including neurons in the brainstem that control breathing. The body enters a coma-like state, followed by respiratory failure and cardiac arrest.
The use of the drug for lethal injections has drawn scrutiny. Under President Biden, the Department of Justice abandoned its use in federal executions.
A review by the Justice Department in January 2025 concluded that there remained “significant uncertainty” about whether using the drug for lethal injections “causes unnecessary pain and suffering.”
In Ms. Pike’s case, medical experts said another possibility was that there had been something wrong with the pentobarbital itself.
The primary manufacturer of pentobarbital has restricted the drug’s use in executions, the Justice Department review noted. As a result, states have turned to chemical companies and compounding pharmacies, which are more loosely regulated.
“Is it possible that the pentobarbital itself was somehow not constituted properly?” Dr. Zivot said. “Could it have degraded? Could it have expired? All of those things are possible.”
In a statement after the execution attempt, Ms. Pike’s lawyers cited the possibility of “degraded pentobarbital.” In emergency legal filings, the lawyers said that while two syringes of pentobarbital had been administered, Ms. Pike had not lost consciousness and was snoring.
The Tennessee Department of Correction did not immediately respond to questions on Thursday about the possibility that the pentobarbital had degraded or had leaked into tissue under the skin.
Whatever the reason the execution failed, medical experts said, the possibility that Ms. Pike had suffered the effects of a nonfatal dose of pentobarbital for an extended period created a risk for lasting brain injury.
“She could be facing profound medical complications,” Dr. Zivot said.
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