A pacemaker insertion is a procedure where a small device is placed inside your chest to help control your heart's rhythm. The pacemaker sends electrical signals to your heart if it’s beating too slowly or irregularly, helping it maintain a steady, normal rhythm.

Here's how it works:

1. Preparation: You’ll be given medicine to help you relax, and the area on your chest will be numbed. In some cases, you might be awake during the procedure, but you won’t feel pain.

2. Inserting the Pacemaker: The doctor makes a small cut near your collarbone, and then inserts the pacemaker device, which is about the size of a matchbox. Thin wires, called leads, are placed through blood vessels into your heart to connect the pacemaker.

3. Testing the Pacemaker: Once in place, the doctor will test the pacemaker to make sure it's working properly.

4. Recovery: The procedure usually takes a couple of hours, and you might need to stay in the hospital for a day or two for observation. Afterward, most people can go back to normal activities, though you’ll need to avoid lifting heavy things or raising your arm too high for 2 to 12 weeks.

The pacemaker generator is designed to last for 10 - years, and you’ll need regular check-ups to make sure it’s working well.