pacemaker
n.a small medical device that sends electrical signals to your heart to help it beat at the right speed. It is used when your heart is too slow or has an irregular rhythm.
n.a small electronic device that generates electrical impulses to regulate the beating of the heart. It is typically implanted in the chest to treat bradycardia or arrhythmia.
“The doctor implanted a pacemaker to help his heart beat regularly.”
“After the surgery, the patient's pacemaker was monitored to ensure it maintained a steady rhythm during physical activity.”
“Modern pacemakers are often equipped with advanced sensors that can adjust the heart rate based on the patient's level of physical exertion or breathing patterns.”
From pace + maker.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.