Windows Movie Maker is a fun and easy to use video editing program that allows you to make home movies, automated photo albums and business presentations. It is included as part of the Windows XP operating system. Version Version 2.1 of Windows Movie Maker can be downloaded for free, to upgrade your existing version.
1 When the natural pacemaker is defective, the heartbeat may be too fast, too slow or irregular. 2  Rhythm problems also can occur because of a blockage of your heart's electrical pathways. 3  The artificial pacemaker's pulse generator sends electrical impulses to the heart to help it pump properly. Your heartbeat is sometimes normal and sometimes too fast or too slow. 2  The sinoatrial (SA) node or sinus node is the heart's natural pacemaker. 3  It's a small mass of specialized cells in the top of the right atrium (upper chamber of the heart).
Although there are different types of artificial pacemakers, all are designed to treat bradycardia, a heart rate that is too slow. Some pacemakers function continuously and stimulate the heart at a fixed rate or at an increased rate during exercise.