EditorialTrainers conduct an electrocardiogram test to evaluate the health of one of the older dolphins at the U.S. Navy’s Marine Mammal Program at Naval Base Point Loma in San Diego on Nov. 8, 2022. (Gabriella Angotti-Jones/The New York Times)
EditorialDr. Kimberly Becher, one of two family practitioners in Clay County, stops on the roadside to read a patient’s electrocardiogram before driving out of phone-service range, in Clendenin, W.Va., July 23, 2022. (Maddie McGarvey/The New York Times)
EditorialJeff Williams, chief operating officer of Apple, talks about the electrocardiogram features on the Apple Watch Series 4, at the Steve Jobs Theater in Cupertino, Calif., Sept. 12, 2018. (Jim Wilson/The New York Times)
EditorialCaptain AndrewJohn Briones of Empress Emergency Medical Service checks an electrocardiogram, or EKG, of a man showing flu-like symptoms at his home in Yonkers, N.Y., on April 3, 2020. (Andrew Renneisen/The New York Times)