Sunday, 11 April 2021

George Floyd death from low oxygen

MINNEAPOLIS — The chief medical expert for Hennepin County who carried out the post-mortem on George Floyd testified Friday within the homicide trial of Derek Chauvin, telling jurors that Floyd’s respiration didn’t seem like impaired by the location of Chauvin’s knee on Floyd’s neck.

Dr. Andrew Baker testified that Floyd’s current and underlying coronary heart illness was a contributing reason for his death; it was evidenced by a coronary heart that “weighed more than it should” and coronary arteries that had been considerably narrowed.

“The law enforcement subdual and neck compression is just more than Mr. Floyd could take by virtue of his heart conditions,” Baker stated. 

In his post-mortem report final 12 months, Baker stated Floyd’s coronary heart and lungs stopped amid “law enforcement subdual, restraint and neck compression,” however he did not use the word “asphyxia,” or oxygen loss. He dominated the death a murder.

Friday morning, the former Hennepin County medical expert informed the jury that Floyd died from asphyxia on account of officers’ restraint – going a step additional than the autopsy.

“This is a death where both heart and lungs stop working,”stated Dr. Lindsey Thomas, a former forensic pathologist for the county who educated Baker. “The point is it’s due to law enforcement subdual, restraint and compression.”

A family-commissioned autopsy released around the same time discovered Floyd’s death was a murder attributable to “asphyxiation from sustained pressure.”

Chauvin is charged with second-degree homicide, third-degree homicide and second-degree manslaughter in Floyd’s death.

Where issues stand: This week, the prosecution has referred to as consultants and police officers to testify about correct use of drive and medical professionals to testify about how Floyd died. Prosecutors have additionally requested consultants to testify in regards to the function of medication present in Floyd’s system, attempting to move off the protection’s argument that medication performed a key function in his death. The protection has highlighted the impact meth and fentanyl could have on the center and lungs. The protection has additionally argued the group of bystanders gathered close to the scene distracted and threatened the officers, stopping them from giving care to Floyd and meriting further drive.

Stay up to date on the Derek Chauvin trial: Sign up for text messages of key updates, comply with USA TODAY Network reporters on Twitter, or subscribe to the Daily Briefing newsletter.

Latest updates:

  • Court is adjourned for the day. Jurors will return Monday at 9:30 a.m. CDT.
  • Andrew Baker, the chief medical expert for Hennepin County who carried out the post-mortem on George Floyd, took the stand Friday afternoon.
  • Jurors have heard from 35 witnesses thus far – all referred to as by the prosecution.
  • A medical expert in the physiology of breathing said Thursday the best way Floyd was restrained prevented him from respiration correctly and brought about his death.
  • Another, a police surgeon, stated Floyd didn’t overdose or have a heart attack.
  • A forensic toxicologist who analyzed George Floyd’s blood and urine informed jurors Thursday the quantity of meth in Floyd’s system was in step with a prescribed dose – a “very low” quantity.

Chief medical expert particulars findings of George Floyd post-mortem for jury

Dr. Andrew Baker, the chief medical expert for Hennepin County, informed jurors that the “top-line” direct reason for Floyd’s death remained unchanged at the moment: Floyd’s coronary heart and lungs stopped beating on account of being subdued, restrained and having his neck compressed by cops throughout their encounter.

During the post-mortem, Baker stated he didn’t discover any accidents to Floyd’s again, nor any bruises or scrapes. But he discovered “several injuries” to Floyd’s face that might match Floyd’s face pinned to the asphalt within the inclined place the night time earlier than, Baker stated.

He additionally famous handcuff marks on his arms and blunt-force accidents on Floyd’s proper pointed and center fingers.

“These are entirely consistent with him being in an altercation with someone,” Baker stated.

During the examination of Floyd’s physique and organs throughout post-mortem, Baker’s preliminary look discovered no actual injury to the mind, lungs or coronary heart – though he stated there was proof of extreme narrowing of coronary arteries, vital sufficient to trigger sudden death in an individual.

Still, Baker stated, “To the best of my knowledge, he was generally healthy on May 25 before the events of that evening.”

He additionally famous he waited to observe video of Floyd’s wrestle with police till after his examination: “I didn’t want to bias my exam with any preconceived notions,” Baker stated.

Baker additionally testified he didn’t word deprivation of blood or oxygen to the mind, however famous that “the person has to survive the anoxic brain injury for a considerable period of time before we can see” any mind cell injury.

Baker stated Floyd’s coronary heart was exterior the higher restrict of regular for a person of his dimension, contradicting Thomas’ earlier testimony.

“His heart already needed more oxygen by its size,” however that was restricted due to narrowed coronary arteries, he stated.

Baker stated the altercation and ache of being pressed towards asphalt would’ve brought about a rise in stress hormones like adrenaline that would “ask your heart to beat faster. He added: “It’s going to ask your physique for extra oxygen in an effort to get by means of that altercation.”

Baker also said he found no evidence of a pill or pill fragments in Floyd’s stomach.

The defense has argued that Floyd’s underlying heart issues and drug use contributed to his death. 

During questioning from defense attorney Eric Nelson, Baker said he included heart disease, the history of hypertension and the drugs in his system on the death certificate because they played a contributory role in Floyd’s death.

“He skilled a cardiopulmonary arrest within the context of legislation enforcement, subdual, restraint, compression,” Baker said. “It was the stress of that interplay that tipped him over the sting, given his underlying coronary heart illness and its toxicology standing.”

Baker noted neck compression is on the “prime line” of his cause-of-death statement and said he thought Chauvin’s knee was primarily on Floyd’s back, side or the area in between Floyd’s neck. Baker said he didn’t believe Chauvin’s knee placement would anatomically cut off Floyd’s breathing, but also acknowledged he was no expert in assessing and reading video footage.

Prior experts have testified that Chauvin’s knee was primarily on Floyd’s neck through the 9 minutes and 29 seconds that Floyd was prone and handcuffed on the ground last May.

Baker said he did not find anatomical evidence to support the conclusion of death by asphyxiation, adding that he recalled informing Hennepin County attorneys of that fact.

But he also said that he could not detail the impact of the encounter with Chauvin on Floyd’s breathing because he is not a pulmonologist. He repeatedly referred Nelson to ask such questions to such an expert of the respiratory system.

Also, Baker told jurors that if Floyd had been found dead in his locked residence with no evidence of trauma, he would’ve concluded Floyd died of an overdose.

​Nelson’s questioning appeared “to be annoying” to one juror, a Black man, who was seen squinting his eyes toward the attorney and shaking his head slightly.

Upon re-direct questioning by state’s attorney Jerry Blackwell,Baker emphasized that the top-line direct cause of death remain unchanged today – it’s still “cardiopulmonary arrest” as a result of Floyd being subdued, restrained and his neck compressed by law enforcement. Baker noted again that details like Floyd’s drug intake or underlying heart issues are “contributing causes.”

“It was my prime line then. It would keep my prime line now,” Baker said of the law enforcement restraint. “I’d nonetheless classify it as a murder at the moment.”

Forensic pathologist: George Floyd died from asphyxia, or low oxygen

Friday morning, the prosecution called forensic pathologist Dr. Lindsey Thomas as an expert witness who has reviewed documents and videos in the case. She also trained Dr. Andrew Baker, the Hennepin County chief medical examiner who ruled Floyd’s death a homicide, and who was expected to testify later on Friday.

Thomas said she agreed with Baker’s autopsy findings. “In this case, I consider the first mechanism of death is asphyxia, or low oxygen,” she said. “This will not be a sudden cardiac death.”

In this image from video, Dr. Lindsey Thomas, a forensic pathologist, now retired, testifies as Hennepin County Judge Peter Cahill presides, Friday, April 9, 2021.

Thomas entered semi-retirement in 2017 but still does consulting and works in the medical examiner’s offices in Reno and Las Vegas. Previously, she was the medical examiner for several Minnesota counties. She said she’s performed about 5,000 autopsies and has consulted with other medical examiners on roughly 1,000 more autopsies.

Thomas said Floyd’s autopsy was “actually nice for ruling issues out.” She said there was no evidence from the autopsy that Floyd had sufficient lung disease to impair his breathing. He didn’t have a heart attack or a stroke, she said. And the slow nature of Floyd’s death shows he did not die of a methamphetamine or fentanyl overdose, she said.

“Basically, Mr. Floyd was able … the place he was unable to get sufficient oxygen,” Thomas said, echoing prior testimony by Dr. Martin Tobin and Dr. Bill Smock, other medical expert witnesses called by the prosecution on Thursday. Answering prosecutor Jerry Blackwell, she later emphasized: “There’s no proof to recommend he would have died that night time aside from the interactions with legislation enforcement.”

The long struggle with police produced chemical reactions in Floyd’s body that caused physiological stress, Thomas said: “This goes on for minute, after minute, for 9 minutes,” she stated. The physiological stress that outcomes from that scenario would not present up in an post-mortem, however might be thought-about a contributing reason for death,” Thomas testified.

On cross examination, lead protection lawyer Eric Nelson advised Floyd’s underlying coronary heart points and drug use contributed to his death.

Prompted by Nelson, Thomas stated the post-mortem confirmed Floyd’s coronary heart was enlarged and that Floyd had narrowing of coronary arteries. If Floyd had died at house, with no confrontation with police, Thomas stated she would most likely have concluded that Floyd died of coronary heart illness.

Asked if, in one other hypothetical situation the place Floyd was discovered lifeless at house, she would conclude Floyd died of an overdose, Thomas stated she “could consider” it.

Nelson additionally referenced research in Canada that discovered folks arrested within the inclined place didn’t die. Thomas appeared skeptical of the examine. She stated the inclined place will not be inherently harmful “unless there are other factors.”

“I could be laying by the pool in Florida, on my stomach in the prone position, not inherently dangerous?” Nelson stated. “Right,” stated Thomas.

In this image from video, prosecutor Jerry Blackwell questions Dr. Lindsey Thomas, a forensic pathologist, now retired, as Hennepin County Judge Peter Cahill presides Friday, April 9, 2021.

When prosecutor Jerry Black re-questioned Thomas, he challenged the hypothetical eventualities Nelson had . “Aren’t those questions a lot like asking, Mrs. Lincoln, if we take John Wilkes Booth out of this,” Blackwell began, only to be stopped by Judge Peter Cahill for posing an argumentative question. Thomas agreed, as a forensic pathologist, she would not pursue a hypothetical situation by removing factors that she concluded had caused death.

Blackwell also followed up on Nelson’s pool scenario. “George Floyd was not laying by the pool on his abdomen in Florida, was he?” Blackwell asked. “No,” Thomas said.

Doctor for prosecution: ‘What Mr. Floyd was subjected to’ would kill a healthy person

Dr. Martin Tobin, a doctor who has been working in respiratory physiology for 40 years, testified Thursday that Floyd died from a “low degree of oxygen,” which caused damage to his brain and an abnormal heartbeat. Tobin was called as an expert witness by prosecutors and examined records and video in the Floyd case, but he did not conduct an examination of Floyd’s body.

In this image from video, Dr. Martin Tobin testifies as Hennepin County Judge Peter Cahill presides Thursday, April 8, 2021, in the trial of former Minneapolis police Officer Derek Chauvin at the Hennepin County Courthouse in Minneapolis, Minn.

Tobin said he watched videos of Floyd’s arrests “lots of of occasions” and found Chauvin’s left knee was on Floyd’s neck for the majority of the time. The combination of Floyd being handcuffed behind his back, the officers’ manipulation of the cuffs, and the pavement beneath Floyd combined to interfere with Floyd’s ability to breathe, Tobin testified.

The overall effect of the restraint was almost “as if a surgeon had gone in and eliminated the lung,” he said, referring to Floyd’s left lung. “A wholesome particular person subjected to what Mr. Floyd was subjected to would have died on account of what he was subjected to,” Tobin stated. Read more about his testimony here.



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