Get it in writing -- whether it's an estimate or invoice for work performed, it should be detailed and itemized -- stating the charges for each part, labor charges and sales tax. It is not reasonable for you to expect them to name an exact time when they will be there. A 2 to 4 hour time window is reasonable.
A pacemaker is a small device that's placed in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate. Pacemakers are used to treat arrhythmias (ah-RITH-me-ahs). Arrhythmias are problems with the rate or rhythm of the heartbeat. During an arrhythmia, the heart can beat too fast, too slow, or with an irregular rhythm.
Pacemakers do not take over the work of the heart. After you have a pacemaker, your heart still does all its own work. Rather, the pacemaker merely helps to regulate the timing and sequence of of your heart beat. Pacemakers consist of two major parts: the generator and the leads.