For almost an hour after Tennessee began trying to kill Christa Pike, witnesses could still hear her breathing.

Sometimes it sounded like snoring.

Sometimes there were deep breaths.

Earlier, she had complained that her arm was burning and throbbing.

At one point, according to witnesses and her lawyers, she said it felt as though her arm might burst open.

Then the curtains closed.

They opened again.

Pike was still alive.

Tennessee administered the backup dose of pentobarbital authorized under its lethal-injection protocol.

She still did not die.

The curtains came down again.

Eventually the microphone went silent.

But the execution had failed.

Pike was transported by ambulance to a Nashville-area hospital, where her attorneys said she remained unconscious, intubated and on a ventilator while doctors attempted to treat the effects of the drug and extensive injuries to both arms.

By October 3, the institutional consequences were already widening.

Governor Bill Lee had ordered an independent review and halted Tennessee’s remaining executions for the year.

Then Department of Correction Commissioner Frank Strada announced that he was resigning, saying stepping aside was in the state’s best interest while investigators examined what had gone wrong.

Yet Pike’s survival has forced attention onto a question that existed long before her execution.

What exactly happens inside the body when an enormous dose of pentobarbital is used to kill a human being?

The official image is deceptively simple.

The prisoner lies on a gurney.

An IV is connected.

The drug begins flowing.

Consciousness disappears.

Breathing stops.

The heart eventually stops.

Death is pronounced.

But autopsy findings, medical litigation and eyewitness accounts have produced a far more contested picture.

And one of the phrases repeatedly used by physicians who challenge the method is almost impossible to forget:

Drowning from the inside.

Pentobarbital is not inherently an execution drug.

It is a short-acting barbiturate—a powerful central nervous system depressant with legitimate medical uses.

In clinical doses, barbiturates can produce sedation, hypnosis and anesthesia.

At increasing doses they suppress brain activity and respiration.

According to the official drug labeling, severe barbiturate overdose can progress through coma, respiratory depression, apnea, circulatory collapse and death. Pulmonary edema is also listed among possible complications of overdose. DailyMed

Clinical medicine, however, administers pentobarbital under conditions dramatically different from an execution.

The drug label emphasizes slow intravenous administration, monitoring of respiration, blood pressure and cardiac function, and the availability of artificial ventilation and resuscitation equipment.

The clinical objective is to keep the patient alive.

An execution uses an enormous overdose for precisely the opposite purpose. DailyMed

Tennessee’s protocol calls for five grams of pentobarbital.

That amount is many times larger than ordinary anesthetic quantities.

The intended sequence is deep central nervous system depression followed by respiratory arrest and cardiovascular collapse.

But the controversy concerns what happens between the moment the chemical enters the body and the moment the brain can no longer perceive suffering.

One disturbing clue has repeatedly appeared during autopsies.

Heavy lungs.

Wet lungs.

Frothy fluid in airways.

Pulmonary edema.

In pulmonary edema, fluid moves from blood vessels into spaces in the lungs that normally contain air.

As fluid accumulates, oxygen exchange becomes increasingly difficult.

A conscious person developing severe acute pulmonary edema can experience intense air hunger, panic and a sensation resembling drowning.

That is where the phrase comes from.

It does not mean the person is literally inhaling water.

The fluid originates inside the body.

The lungs are effectively becoming flooded from within.

A 2022 medical preprint examined autopsy reports from 43 prisoners executed using either midazolam-based protocols or single-drug pentobarbital.

Researchers reported pulmonary edema in 33 of the 43 cases.

Among the 15 pentobarbital executions specifically, 10 showed pulmonary edema.

Some autopsies documented froth or blood-tinged froth in the airway. medRxiv

Those numbers are striking.

They do not, however, settle the central question.

An autopsy can demonstrate that pulmonary edema occurred.

It generally cannot tell investigators with certainty exactly when conscious awareness ended.

That timing is everything.

One group of anesthesiologists and pathologists argues that acute edema may develop rapidly enough for a prisoner to experience air hunger or suffocation before pentobarbital eliminates consciousness.

Other experts retained by states and the federal government argue that a five-gram dose depresses the brain so rapidly that the condemned prisoner becomes unconscious before pulmonary edema would be consciously perceived.

Federal courts have heard both positions.

In litigation over the federal execution protocol, one court acknowledged conflicting expert evidence and concluded that the challengers had not established that flash pulmonary edema was certain or likely to occur before insensibility.

Other litigation involving prisoners with particular medical conditions has produced different factual findings. Justia Law

A later Justice Department review captured the scientific dispute unusually clearly.

Experts supporting the protocol argued that pentobarbital should cause unconsciousness within roughly tens of seconds and that any edema would occur after profound brain depression.

Opposing experts argued that unresponsiveness does not necessarily prove absence of awareness and that pulmonary injury may begin before complete unconsciousness.

The review ultimately said substantial uncertainty remained. Supreme Court

That uncertainty became impossible to dismiss in Tennessee after the August 2025 execution of Byron Black.

Witnesses said Black groaned repeatedly.

He lifted his head.

He told his spiritual adviser that he was hurting.

His autopsy later documented pulmonary congestion and edema.

The Death Penalty Information Center, which opposes capital punishment, cited pathologists who said severe pulmonary edema can produce panic, suffocation and sensations of drowning. Death Penalty Information Center

That does not independently prove precisely what Black experienced internally.

It does show that the abnormal lung findings critics had warned about were physically present after his death.

Pike’s attorneys knew about those findings.

Months before her September 30 execution, they argued that her own medical circumstances might make Tennessee’s pentobarbital protocol particularly dangerous.

They cited difficult veins and a blood disorder and warned of both IV problems and pulmonary complications. Death Penalty Information Center

Then September 30 arrived.

And the first problem appears to have developed before pentobarbital could even do what the state intended.

The IV access was extraordinarily difficult.

According to the emergency filing from Pike’s attorneys, execution personnel used at least seven needles.

One needle reportedly came out severely bent.

Pike herself allegedly tried to direct staff toward locations where they might have better success.

When the drug was administered, she complained of intense arm pain.

Later, when Pike reached the hospital, her attorneys said both arms were swollen, burned and blistered. ABC News

The defense theory is that one or both IV lines infiltrated.

Infiltration or extravasation occurs when medication intended for a vein instead leaks into surrounding tissue.

This matters because intravenous pentobarbital solution is chemically harsh.

Commercial pentobarbital sodium formulations are alkaline, with a pH around 9.5.

If concentrated execution chemicals escape a vein and enter soft tissue, local injury and severe pain are plausible concerns. DailyMed

It would also help explain one of the great mysteries of Pike’s execution.

How could a person receive two execution doses and remain alive?

If substantial quantities of the drug entered tissue instead of circulating rapidly through the bloodstream, the drug would not reach the brain and heart in the intended concentration or timetable.

At the same time, the tissue itself could be injured.

That explanation remains a working theory, not the final official conclusion.

Governor Lee’s independent review is intended to determine precisely what occurred. Reuters

But the spectacle inside Riverbend Maximum Security Institution has renewed interest in something much less measurable than drug concentration.

The effect on people watching.

Rev. Stacy Rector knows that part of the story.

Rector has opposed the death penalty in Tennessee for roughly two decades and leads Tennesseans for Alternatives to the Death Penalty.

In 2009 she was not simply an activist standing outside a prison.

She was inside.

She had spent about a decade visiting Steve Henley on Tennessee’s death row and served as his spiritual adviser. Tennesseans for Death Penalty Reform

Henley had been convicted of the 1985 first-degree murders of Fred and Edna Stafford.

He maintained his innocence through the end, but his convictions and death sentence survived the appeals process.

Tennessee executed him on February 4, 2009. Tennessee Courts

Rector watched.

She later wrote that she was with Henley before he was placed on the gurney.

She sat alongside members of his family when the blinds opened.

She watched him speak his final words.

Then the chemicals entered his body.

He began turning blue.

Eventually officials declared him dead.

“That image will stay with me forever,” she wrote years afterward. Sojourners

Recent reporting after Pike’s failed execution returned to Rector’s memories.

She recalled that Henley began making snoring sounds as the execution drugs took effect.

She closed her eyes and prayed.

When she looked again, his skin color had changed dramatically.

Henley’s daughter became physically ill while watching her father die.

For Rector, the experience did not end when officials opened the witness-room door.

Seventeen years later, she still describes it as a lasting trauma. The Sun

There is an important medical distinction here.

Henley was executed under Tennessee’s older three-drug protocol, not the modern single-drug pentobarbital procedure.

His death therefore cannot be used as straightforward evidence of what pentobarbital alone does.

Rector’s account is evidence of something different:

What an execution can do psychologically to the people required or permitted to witness it. Death Penalty Information Center

That group is larger than many people imagine.

Victims’ relatives.

The condemned prisoner’s family.

Journalists.

Attorneys.

Clergy.

Wardens.

Correctional officers.

Medical or technical personnel.

People who may have spent years supporting an execution.

People who may have spent years fighting it.

All can end up sitting only feet away from a human death they will remember differently.

That was painfully visible in Pike’s case.

Colleen Slemmer’s mother, May Martinez, traveled from Florida to Tennessee expecting to witness the punishment imposed for her daughter’s 1995 murder.

Instead, she watched an execution fail.

Martinez later described the experience as another source of anguish and said she did not know whether she would put herself through another attempt if Tennessee eventually scheduled one. People.com

Her trauma exists alongside Rector’s.

Their views on capital punishment are very different.

Their relationship to the condemned prisoners is completely different.

But both illustrate why an execution does not affect only the person on the gurney.

Pike’s procedure made that point more dramatically than almost any modern American execution.

Media witnesses watched her react to the IV.

They heard her complain.

They watched her continue breathing.

The curtain repeatedly interrupted what they could see.

Then they sat in the witness room listening to loud respirations and snoring for almost fifty minutes before the chamber microphone was turned off.

They eventually left without watching a death at all. AP News

That detail—snoring—deserves special caution.

In ordinary life, snoring sounds almost reassuring.

A sleeping person snores.

Execution authorities have sometimes used similar descriptions of respiratory sounds during lethal injections.

Critics argue that such terminology can make abnormal breathing sound peaceful.

Death-penalty scholar Corinna Barrett Lain has pointed out that reporters have observed gasping and bodily movements during executions even when officials characterized respiratory noises as sleep-like snoring. Death Penalty Information Center

Medically, a snoring sound does not prove comfort.

Nor does it prove consciousness.

It indicates turbulent airflow through a partially obstructed upper airway.

A deeply unconscious person can snore.

So can someone in severe respiratory compromise.

That is why the sound itself cannot answer whether Pike consciously experienced pulmonary edema or suffocation.

Her spoken complaints about her arm occurred earlier and provide clearer evidence that she was experiencing local pain while at least partially responsive.

What happened after her consciousness diminished is harder to reconstruct.

That difficulty sits at the heart of the pentobarbital debate.

The drug is supposed to remove awareness.

But the very property that prevents the prisoner from communicating also prevents witnesses from knowing exactly what that prisoner can perceive.

No one who dies under the protocol can later describe the experience.

Pike is different.

She survived.

If she regains consciousness sufficiently to communicate, her account could become medically and legally significant.

She may be able to describe what she remembers.

When awareness disappeared.

Whether she experienced breathlessness.

Whether the dominant sensation was the severe burning in her arms.

Whether she remembers the second dose at all.

As of the latest publicly reported information on October 3, however, her lawyers still described her as critically ill and unconscious on mechanical ventilation. Davis Vanguard

That leaves doctors, witnesses, execution records and physical evidence to reconstruct what happened.

Her lawyers have asked a court to require Tennessee to preserve that evidence.

The IV equipment.

The needles.

Drug records.

Electronic communications.

Execution logs.

Anything capable of establishing whether the failure involved vascular access, the pentobarbital itself, preparation or storage, execution-team decisions, or some combination of factors. ABC News

Pentobarbital itself therefore may not be the sole reason Pike survived.

The IV failure could be central.

The drug could have worked exactly as expected in the portion that actually reached her circulation.

Or other problems could emerge from the investigation.

Those possibilities matter because the phrase “pentobarbital failed” can oversimplify what investigators still do not know.

But the episode has renewed the separate medical question about what happens when the drug does circulate as intended.

The standard pharmacology is clear.

Enough pentobarbital suppresses the brain.

Respiration slows.

Coma develops.

At extreme overdose, breathing can stop and circulation collapses. DailyMed

The unresolved part is what else may occur during those minutes.

Autopsies repeatedly finding pulmonary edema have convinced some anesthesiologists that lethal injection may cause a hidden respiratory crisis.

Other anesthesiologists argue the prisoner will already be deeply unconscious and therefore unable to perceive it.

Government reviews acknowledge the evidence has not conclusively settled the argument. Death Penalty Information Center

That is the scientific truth behind the frightening phrase.

“Drowning from the inside” is not a proven description of what every person executed with pentobarbital consciously feels.

It is a description of the physiology and possible subjective sensation of acute pulmonary edema advanced by medical experts who have studied execution autopsies.

The edema itself is documented.

The awareness remains disputed.

Pike’s case may provide evidence that previous executions could never provide precisely because she lived.

And for people such as Stacy Rector, the medical uncertainty does not erase another reality.

She remembers what she saw.

A man she had known for years strapped to a gurney.

His breathing changing.

His skin turning blue.

His family watching.

Then his death.

Seventeen years later, a new generation of witnesses entered another Tennessee death chamber.

This time, the condemned prisoner did not die.

The state now has to determine why.

Doctors have to determine what the drugs did to Pike’s body.

Courts may eventually have to determine whether Tennessee can legally expose her to another execution attempt.

And the witnesses will have to live with a memory that no protocol can reverse.

The most unsettling question surrounding pentobarbital therefore remains unanswered.

Not whether enough of it can kill.

It clearly can.

The unanswered question is what a human being may experience in the interval between injection and death—

and whether the apparent stillness on the gurney tells observers the whole story.