“I’ll begin this story the same way I began the phone call to my wife: “I’m OK, but…,” Chuck La Tournous writes for Macworld.

“The ‘but’ began on a Tuesday morning, after I started walking from the parking lot to the front door of my office building. I began feeling short of breath. No matter how deeply I inhaled, it felt like my lungs weren’t filling up completely. At first, the feeling just seemed odd—nothing serious, just…weird,” La Tournous writes. “By the time I climbed the flight of stairs to my floor, the feeling had grown worse. Along with the shortness of breath, I could feel my heart racing in my chest. Stopping to talk to a colleague on the way to my office, the mere act of speaking left me practically gasping for air. I cut the conversation short and continued to my office. Sitting still made me feel better, but not great.”

“It was then I thought about the heart rate sensor on my Apple Watch,” La Tournous writes. “I opened the Heart Rate app, curious to see if my heart rate was actually elevated or if it was just my imagination.”

Read the full story here.

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