“Oxygen 96 percent and heart rate, 86.” “Is that good?” Bill looked up at me, puzzled, as I told him the results of his routine pulse oximetry and heart rate check. “Yep, that’s good. It means that right now your body’s getting enough oxygen and also that your heart rate is not too fast or too slow.” He shrugged his shoulders and looked down. “Okay… I guess.”Bill had only...