The Holter monitor is a type of electrocardiogram (EKG) used to monitor the EKG tracing continuously for a period of 24 hours. Small plastic patches (electrodes) are placed at certain locations on the chest wall.
The electrical activity of the heart can be recorded to evaluate for symptoms of lightheadedness, dizziness, palpitations, or fainting. Any abnormal beats or rhythms that may cause these symptoms are recorded. Patients are asked to keep a log to report any symptoms that occur in the 24 hour period.