Head of Astroworld medics said 11 people went into cardiac arrest at the same time during Travis Scott's show

• The medical company hired for Astroworld said 11 people went into cardiac arrest simultaneously.

• "This is something I have nightmares about for the rest of my life," CEO Alex Pollak told KHOU 11.

• Ten people were killed and hundreds injured at the November 5 Travis Scott performance in Houston.

The head of the private medical company hired by organizers of Travis Scott's Astroworld music festival said that at one point medics had the daunting task of treating 11 people who were in cardiac arrest at the same time amid the deadly crowd surge.

"This is something I have nightmares about for the rest of my life," Alex Pollak, the CEO and founder of ParaDocs — a New York medical company — told KHOU 11 in a report published on Tuesday.

Pollak explained how, at the sold-out November 5 music festival at NRG Park in Houston, his team of more than 70 staffers desperately tried to save the lives of fans at the event in which 10 people, including a 9-year-old, were killed and hundreds were injured in a crowd crush.

The CEO said his team of medics performed CPR on the back of an ambulance cart as they tried to get out of the packed crowd, but unruly concertgoers jumped onto the cart, he told KHOU 11.

"My team is extremely broken up about it. Seeing so many young people getting CPR at one time, it's just something no one should have to go to through," Pollak said.

He added: "Even though we're medical professionals, we should be used to it. You can't get used to something like that."

Pollak said it was standard for ParaDocs to staff an event such as Astroworld with one medic per 1,000 people.

There were more than 50,000 people in attendance at Astroworld.

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