"Mr. Floyd died from a low level of oxygen," a pulmonologist testified at former Minneapolis Police officer Derek Chauvin's trial.
Dr. Martin Tobin, a physician in pulmonary and critical care medicine, testified after having reviewed the medical records in this case. He said he is not being paid to appear in court.
"And this caused damage to his brain that we see and it also caused a PEA arrhythmia, that caused his heart to stop," he told the court.
PEA means pulseless electrical activity, "which is a particular form of abnormal beat of heart — an arrhythmia," he explained.
He also shared his opinion on the cause for the low level of oxygen in Mr. Floyd:
"The cause of the low level of oxygen was shallow breathing. Small breaths. Small tidal volumes. Shallow breaths that weren't able to carry the air through his lungs down to the essential areas of the lungs that get oxygen into the blood and get rid of the carbon dioxide."