What Is It?
A Holter monitor is a 24 hour recording of heart rhythm.
How Is It Done?
A number (usually 4 or 5) ECG dots are attached to the persons chest. These are connected by cables to a small box that records and stores the electrical signals of the heart. These are then retrieved from the box by computer to be analysed by the doctor.
Why Is It Done?
A Holter is done to check for abnormal heart rhythms and to assess the heart rate (speed). It can be used to try and determine the cause for palpitations and blackout as well as determining the effectiveness of some of the treatments for heart rhythm disorders.