Event Recorder

Event Monitor (Event Recorder) is a small, lightweight recorder. When you feel symptoms, such as chest pain, dizziness, palpitations, or fainting spells, you press a button to record your heart’s electrical activity. Event Monitor helps your doctor to determine if your symptoms are caused by a heart disease.

Event Monitoring can show an abnormal heart rhythm, called an arrhythmia. During an arrhythmia, the heart may beat too fast, too slowly, or irregularly.

Sometimes, an arrhythmia will not occur during the brief  ECG testing at the doctor’s office. In this case, if your

doctor suspects you have an arrhythmia, he or she will proscribe you  and Event Monitoring test to record the ECG over a longer period of time.

If you have symptoms  of arrhythmia several times a week, yourdoctor may order a 24-hour recording of your ECG, which is called Holter Monitoring. This type of recorder, records the ECG continuously, whether or not you have symptoms. Holter Monitor is worn on a strap over your shoulder or around your waist,

If your symptoms occur less often, you may be prescribed monitoring for longer then 24 hours. In that case, your doctor may order an Event Monitor, which is worn over a period of days or weeks. There are two basic types of event recorders: Memory-Loop Recorder  and Post-Event Recorder.

Memory-Loop Recorder

Memory-Loop Recorder records and stores a minute or two of ECG data before, during, and after the event. The memory-loop recorder is about the size of a pager. Two or three sticky patches, called electrodes, are applied to your chest and connected by wires to the recorder. The recorder continuously scans your heart’s electrical activity. When you feel symptoms, you press a button to activate the recorder.

Post-Event Recorder

A Post-Event Recorder records the heart’s electrical activity after it is activated.

It may be the size and shape of a credit card or a wristwatch. The recorder has small metal discs that function as the electrodes.

When you feel symptoms, you hold the back of the card against the skin of your chest and press a button to activate the recorder. The device records and stores about a minute of heart rhythm during and after the event. The wristwatch style recorder is worn on your wrist. When you feel symptoms, you press a button and put the palm of your hand on top of the face of the watch. The device will record and store about a minute of the heart rhythm.

Why is Event Monitoring May Be Needed?

  • To determine if symptoms such as dizziness, palpitations, fainting spells, or chest pain are caused by heart disease.
  • To detect poor blood flow to the heart muscle, which can be a sign of coronary heart diseaseTo detect arrhythmias that occur irregularly or infrequently
  • To see how well arrhythmia treatments are working

You can pick up the recorder at the doctor’s office, test center, or hospital. A nurse or a technician will show you how to operate the device. You may also be given printed instructions to take with you.

If you are given a memory-loop recorder you will be shown how to apply the electrodes.


• Rotate the electrodes every day to avoid skin irritation

• Do not swim, take a shower, or bath while wearing the recorder

• If you notice skin irritation from the electrodes, call your doctor

You will use the event recorder for several days or weeks. You can continue your normal daily activities while carrying the recorder. When you feel symptoms, you press the “RECORD” button to activate the device. You will be told whether to transmit your ECG after each event or wait until the recorder’s memory is full.

How To Transmit you ECG data

To transmit your ECG data over the phone, you have to call the receiving center. You have to press the “SEND” button on the recorder when you are instructed to do so, and then place the telephone mouthpiece over the device. The stored ECG data will be transmitted to the receiving center, where they will be printed and reviewed by a team of nurses and/or ECG technicians.


You will have to keep a diary during the testing period. This diary will help your doctor to compare your activities and symptoms with the data on the ECG recordings.

In the diary you have to describe what you were doing when an event occurred, the symptoms you experienced, and  the date and time at which the event occurred



Date Time Activity Symptoms
02/19 9:15 am Speeping Chest pain
12:17 pm Having Dinner Chest pressure
02/22 9:20 am Walking Fluttering in the chest
10:45 pm Taking Shower A few skipped beats