Dr. Martin J. Tobin, a pulmonologist, says George Floyd ‘died from a low level of oxygen.’During his testimony, Dr. Tobin said Mr. Floyd’s prone position and being handcuffed and Mr. Chauvin’s knee on his neck and back contributed to his shallow breathing.By Marie Fazio

Dr. Martin J. Tobin, a pulmonologist and critical care physician from the Chicago area, was the first witness prosecutors called to the stand in the Derek Chauvin trial on Thursday.

When the state asked if he had formed a medical opinion on what had caused George Floyd’s death, Dr. Tobin said that “Mr. Floyd died from a low level of oxygen, and this caused damage to his brain that we see, and it also caused a P.E.A. arrhythmia because his heart stopped,” referring to pulseless electrical activity, or cardiac arrest.

The low level of oxygen was caused by “shallow breathing,” he said. Mr. Floyd’s prone position and being handcuffed and Mr. Chauvin’s knee on his neck and back contributed to his shallow breathing.

Dr. Tobin attended medical school at University College Dublin and is an expert in acute respiratory failure, mechanical ventilation and neuromuscular control of breathing.

He is certified by the American Board of Internal Medicine and the American Board of Internal Medicine Subspecialty Pulmonary Disease.

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