Take the D scale for example. Start on the D note at the second fret and move up the scale like this to the next D: If you play this same pattern up two frets (so the E is the first note you play), youâll have an E major scale. The same goes for any other pattern you can spot in these scale maps.
A pacemaker signals the heart to beat when the heartbeat is too slow or irregular. A pulse generator is a small metal case that contains electronic circuitry with a small computer and a battery that regulate the impulses sent to the heart.
When a pacemaker fails because the battery wears out, at least that's a gradual and predictable event. As you yourself have said, your doctor knows that your pacemaker battery is going to fail in the next year or so, and he's therefore scheduling an elective pacemaker replacement at your convenience.