You wake up to commotion – your mother’s woken up in the middle of the night and is having trouble breathing. She struggles to sit up, holding her hand to her chest. You rush her to the hospital. When you both get there, she feels fine. Every reading turns up normal. This is the third time this has happened this month.
This time’s different, though. A doctor hands you a triangular device with little sticky cups on the back. If this happens again, he says, come back, but stick this under her collarbone before you get here.
Two weeks later, you