Family credits Apple Watch for saving daughter's life

Deanna Recktenwald had a resting heart rate of 160 beats per minute.

“The only symptom that I had was that I was out of breath from walking and standing and sitting so it kind of didn't make much sense,” Recktenwald told ABC News.

Recktenwald's mother, Stacey Recktenwald, a registered nurse, rushed her to an urgent care facility.

"It was scary because she was just sitting there. She wasn't doing anything. It wasn't like she was running around. She was just standing there and it spiked up to 190," her mom said.

After her vitals were taken, Deanna Recktenwald was instructed to go to the emergency room immediately.

“I was shocked because even if you look at her today, she's perfectly healthy looking,” Stacey Recktenwald said.

The alert from the device helped save her life, Recktenwald’s doctor told ABC News.

Tampa General Hospital would not comment on Deanna Recktenwald's condition, citing the Health Insurance Portability and Accountability Act (HIPAA) laws.

“I am forever grateful to Apple for developing such an amazing lifesaving product,” Stacey Recktenwald said in the letter. “If it wasn’t for her Apple watch alarming her about her HR we wouldn’t have discovered her kidney issue. I honestly feel that your Apple Watch has saved my daughter’s life.”

A few days later an email from Cook himself popped up on her screen.

The Apple Watch can measure a person’s heart rate during resting, workout, recovery, walking and breath sessions, according to Apple. The company also has a partnership with Stanford Medicine for the Apple Heart Study app, which will look at heart rate and rhythm.

Stacey Recktenwald is about to purchase her own Apple Watch and said Deanna never takes hers off since the scare.

“She won’t go to sleep without the watch on," she said. "She’s so dependent on it because she was so shocked when the doctor said she was in kidney failure.”