People with significant heart disease are more adversely affected and die at lower levels of carbon monoxide poisoning than healthy people, he said.
When asked how he knew the car engine was running, Fowler told Blackwell that he saw water dripping from the tailpipe. He took that to mean the police squad car ignition was turned on. He admitted that he didn’t get more information or ask to verify his conclusion about the car.
Fowler also agreed with Blackwell that he did not do testing to simulate what Floyd could have been exposed to near a similar vehicle.
Fowler also repeated prior expert witness testimony that Floyd’s right coronary artery showed the greatest amount of narrowing, at 90%, which increases the risk of sudden death.
Physical exertion increases the body’s need for oxygen, while methamphetamine increases the heart rate, and causes arteries to narrow to the point where it slows down blood flow, Fowler said. Methamphetamine also increases the risk of arrhythmia, he said.
“There’s multiple entities all acting together and adding to each other and taking away from a different part of the ability to give oxygen into his heart,” Fowler said. “At some point, the heart exhausted its reserves of metabolic supply and went into an arrhythmia and stopped pumping blood effectively.”
Prompted by Nelson, Fowler cited a study suggesting Chauvin’s knee restraint on Floyd would have transferred less than 35 pounds of weight onto his body. Fowler did not include additional police equipment like the duty belt, which adds additional weight to the calculation.